1 //===-- X86ISelLowering.cpp - X86 DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that X86 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #include "X86ISelLowering.h"
16 #include "Utils/X86ShuffleDecode.h"
17 #include "X86CallingConv.h"
18 #include "X86FrameLowering.h"
19 #include "X86InstrBuilder.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86TargetMachine.h"
22 #include "X86TargetObjectFile.h"
23 #include "llvm/ADT/SmallBitVector.h"
24 #include "llvm/ADT/SmallSet.h"
25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/CodeGen/IntrinsicLowering.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineFunction.h"
31 #include "llvm/CodeGen/MachineInstrBuilder.h"
32 #include "llvm/CodeGen/MachineJumpTableInfo.h"
33 #include "llvm/CodeGen/MachineModuleInfo.h"
34 #include "llvm/CodeGen/MachineRegisterInfo.h"
35 #include "llvm/CodeGen/WinEHFuncInfo.h"
36 #include "llvm/IR/CallSite.h"
37 #include "llvm/IR/CallingConv.h"
38 #include "llvm/IR/Constants.h"
39 #include "llvm/IR/DerivedTypes.h"
40 #include "llvm/IR/Function.h"
41 #include "llvm/IR/GlobalAlias.h"
42 #include "llvm/IR/GlobalVariable.h"
43 #include "llvm/IR/Instructions.h"
44 #include "llvm/IR/Intrinsics.h"
45 #include "llvm/MC/MCAsmInfo.h"
46 #include "llvm/MC/MCContext.h"
47 #include "llvm/MC/MCExpr.h"
48 #include "llvm/MC/MCSymbol.h"
49 #include "llvm/Support/CommandLine.h"
50 #include "llvm/Support/Debug.h"
51 #include "llvm/Support/ErrorHandling.h"
52 #include "llvm/Support/MathExtras.h"
53 #include "llvm/Target/TargetOptions.h"
54 #include "X86IntrinsicsInfo.h"
60 #define DEBUG_TYPE "x86-isel"
62 STATISTIC(NumTailCalls, "Number of tail calls");
64 static cl::opt<bool> ExperimentalVectorWideningLegalization(
65 "x86-experimental-vector-widening-legalization", cl::init(false),
66 cl::desc("Enable an experimental vector type legalization through widening "
67 "rather than promotion."),
70 X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
71 const X86Subtarget &STI)
72 : TargetLowering(TM), Subtarget(&STI) {
73 X86ScalarSSEf64 = Subtarget->hasSSE2();
74 X86ScalarSSEf32 = Subtarget->hasSSE1();
75 MVT PtrVT = MVT::getIntegerVT(8 * TM.getPointerSize());
77 // Set up the TargetLowering object.
78 static const MVT IntVTs[] = { MVT::i8, MVT::i16, MVT::i32, MVT::i64 };
80 // X86 is weird. It always uses i8 for shift amounts and setcc results.
81 setBooleanContents(ZeroOrOneBooleanContent);
82 // X86-SSE is even stranger. It uses -1 or 0 for vector masks.
83 setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
85 // For 64-bit, since we have so many registers, use the ILP scheduler.
86 // For 32-bit, use the register pressure specific scheduling.
87 // For Atom, always use ILP scheduling.
88 if (Subtarget->isAtom())
89 setSchedulingPreference(Sched::ILP);
90 else if (Subtarget->is64Bit())
91 setSchedulingPreference(Sched::ILP);
93 setSchedulingPreference(Sched::RegPressure);
94 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
95 setStackPointerRegisterToSaveRestore(RegInfo->getStackRegister());
97 // Bypass expensive divides on Atom when compiling with O2.
98 if (TM.getOptLevel() >= CodeGenOpt::Default) {
99 if (Subtarget->hasSlowDivide32())
100 addBypassSlowDiv(32, 8);
101 if (Subtarget->hasSlowDivide64() && Subtarget->is64Bit())
102 addBypassSlowDiv(64, 16);
105 if (Subtarget->isTargetKnownWindowsMSVC()) {
106 // Setup Windows compiler runtime calls.
107 setLibcallName(RTLIB::SDIV_I64, "_alldiv");
108 setLibcallName(RTLIB::UDIV_I64, "_aulldiv");
109 setLibcallName(RTLIB::SREM_I64, "_allrem");
110 setLibcallName(RTLIB::UREM_I64, "_aullrem");
111 setLibcallName(RTLIB::MUL_I64, "_allmul");
112 setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::X86_StdCall);
113 setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::X86_StdCall);
114 setLibcallCallingConv(RTLIB::SREM_I64, CallingConv::X86_StdCall);
115 setLibcallCallingConv(RTLIB::UREM_I64, CallingConv::X86_StdCall);
116 setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::X86_StdCall);
119 if (Subtarget->isTargetDarwin()) {
120 // Darwin should use _setjmp/_longjmp instead of setjmp/longjmp.
121 setUseUnderscoreSetJmp(false);
122 setUseUnderscoreLongJmp(false);
123 } else if (Subtarget->isTargetWindowsGNU()) {
124 // MS runtime is weird: it exports _setjmp, but longjmp!
125 setUseUnderscoreSetJmp(true);
126 setUseUnderscoreLongJmp(false);
128 setUseUnderscoreSetJmp(true);
129 setUseUnderscoreLongJmp(true);
132 // Set up the register classes.
133 addRegisterClass(MVT::i8, &X86::GR8RegClass);
134 addRegisterClass(MVT::i16, &X86::GR16RegClass);
135 addRegisterClass(MVT::i32, &X86::GR32RegClass);
136 if (Subtarget->is64Bit())
137 addRegisterClass(MVT::i64, &X86::GR64RegClass);
139 for (MVT VT : MVT::integer_valuetypes())
140 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
142 // We don't accept any truncstore of integer registers.
143 setTruncStoreAction(MVT::i64, MVT::i32, Expand);
144 setTruncStoreAction(MVT::i64, MVT::i16, Expand);
145 setTruncStoreAction(MVT::i64, MVT::i8 , Expand);
146 setTruncStoreAction(MVT::i32, MVT::i16, Expand);
147 setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
148 setTruncStoreAction(MVT::i16, MVT::i8, Expand);
150 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
152 // SETOEQ and SETUNE require checking two conditions.
153 setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
154 setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
155 setCondCodeAction(ISD::SETOEQ, MVT::f80, Expand);
156 setCondCodeAction(ISD::SETUNE, MVT::f32, Expand);
157 setCondCodeAction(ISD::SETUNE, MVT::f64, Expand);
158 setCondCodeAction(ISD::SETUNE, MVT::f80, Expand);
160 // Promote all UINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have this
162 setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
163 setOperationAction(ISD::UINT_TO_FP , MVT::i8 , Promote);
164 setOperationAction(ISD::UINT_TO_FP , MVT::i16 , Promote);
166 if (Subtarget->is64Bit()) {
167 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512())
168 // f32/f64 are legal, f80 is custom.
169 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Custom);
171 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Promote);
172 setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
173 } else if (!Subtarget->useSoftFloat()) {
174 // We have an algorithm for SSE2->double, and we turn this into a
175 // 64-bit FILD followed by conditional FADD for other targets.
176 setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
177 // We have an algorithm for SSE2, and we turn this into a 64-bit
178 // FILD or VCVTUSI2SS/SD for other targets.
179 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Custom);
182 // Promote i1/i8 SINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have
184 setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
185 setOperationAction(ISD::SINT_TO_FP , MVT::i8 , Promote);
187 if (!Subtarget->useSoftFloat()) {
188 // SSE has no i16 to fp conversion, only i32
189 if (X86ScalarSSEf32) {
190 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
191 // f32 and f64 cases are Legal, f80 case is not
192 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
194 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Custom);
195 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
198 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
199 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Promote);
202 // In 32-bit mode these are custom lowered. In 64-bit mode F32 and F64
203 // are Legal, f80 is custom lowered.
204 setOperationAction(ISD::FP_TO_SINT , MVT::i64 , Custom);
205 setOperationAction(ISD::SINT_TO_FP , MVT::i64 , Custom);
207 // Promote i1/i8 FP_TO_SINT to larger FP_TO_SINTS's, as X86 doesn't have
209 setOperationAction(ISD::FP_TO_SINT , MVT::i1 , Promote);
210 setOperationAction(ISD::FP_TO_SINT , MVT::i8 , Promote);
212 if (X86ScalarSSEf32) {
213 setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Promote);
214 // f32 and f64 cases are Legal, f80 case is not
215 setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
217 setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Custom);
218 setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
221 // Handle FP_TO_UINT by promoting the destination to a larger signed
223 setOperationAction(ISD::FP_TO_UINT , MVT::i1 , Promote);
224 setOperationAction(ISD::FP_TO_UINT , MVT::i8 , Promote);
225 setOperationAction(ISD::FP_TO_UINT , MVT::i16 , Promote);
227 if (Subtarget->is64Bit()) {
228 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512()) {
229 // FP_TO_UINT-i32/i64 is legal for f32/f64, but custom for f80.
230 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Custom);
231 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Custom);
233 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Promote);
234 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Expand);
236 } else if (!Subtarget->useSoftFloat()) {
237 // Since AVX is a superset of SSE3, only check for SSE here.
238 if (Subtarget->hasSSE1() && !Subtarget->hasSSE3())
239 // Expand FP_TO_UINT into a select.
240 // FIXME: We would like to use a Custom expander here eventually to do
241 // the optimal thing for SSE vs. the default expansion in the legalizer.
242 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Expand);
244 // With AVX512 we can use vcvts[ds]2usi for f32/f64->i32, f80 is custom.
245 // With SSE3 we can use fisttpll to convert to a signed i64; without
246 // SSE, we're stuck with a fistpll.
247 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Custom);
249 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Custom);
252 // TODO: when we have SSE, these could be more efficient, by using movd/movq.
253 if (!X86ScalarSSEf64) {
254 setOperationAction(ISD::BITCAST , MVT::f32 , Expand);
255 setOperationAction(ISD::BITCAST , MVT::i32 , Expand);
256 if (Subtarget->is64Bit()) {
257 setOperationAction(ISD::BITCAST , MVT::f64 , Expand);
258 // Without SSE, i64->f64 goes through memory.
259 setOperationAction(ISD::BITCAST , MVT::i64 , Expand);
263 // Scalar integer divide and remainder are lowered to use operations that
264 // produce two results, to match the available instructions. This exposes
265 // the two-result form to trivial CSE, which is able to combine x/y and x%y
266 // into a single instruction.
268 // Scalar integer multiply-high is also lowered to use two-result
269 // operations, to match the available instructions. However, plain multiply
270 // (low) operations are left as Legal, as there are single-result
271 // instructions for this in x86. Using the two-result multiply instructions
272 // when both high and low results are needed must be arranged by dagcombine.
273 for (unsigned i = 0; i != array_lengthof(IntVTs); ++i) {
275 setOperationAction(ISD::MULHS, VT, Expand);
276 setOperationAction(ISD::MULHU, VT, Expand);
277 setOperationAction(ISD::SDIV, VT, Expand);
278 setOperationAction(ISD::UDIV, VT, Expand);
279 setOperationAction(ISD::SREM, VT, Expand);
280 setOperationAction(ISD::UREM, VT, Expand);
282 // Add/Sub overflow ops with MVT::Glues are lowered to EFLAGS dependences.
283 setOperationAction(ISD::ADDC, VT, Custom);
284 setOperationAction(ISD::ADDE, VT, Custom);
285 setOperationAction(ISD::SUBC, VT, Custom);
286 setOperationAction(ISD::SUBE, VT, Custom);
289 setOperationAction(ISD::BR_JT , MVT::Other, Expand);
290 setOperationAction(ISD::BRCOND , MVT::Other, Custom);
291 setOperationAction(ISD::BR_CC , MVT::f32, Expand);
292 setOperationAction(ISD::BR_CC , MVT::f64, Expand);
293 setOperationAction(ISD::BR_CC , MVT::f80, Expand);
294 setOperationAction(ISD::BR_CC , MVT::i8, Expand);
295 setOperationAction(ISD::BR_CC , MVT::i16, Expand);
296 setOperationAction(ISD::BR_CC , MVT::i32, Expand);
297 setOperationAction(ISD::BR_CC , MVT::i64, Expand);
298 setOperationAction(ISD::SELECT_CC , MVT::f32, Expand);
299 setOperationAction(ISD::SELECT_CC , MVT::f64, Expand);
300 setOperationAction(ISD::SELECT_CC , MVT::f80, Expand);
301 setOperationAction(ISD::SELECT_CC , MVT::i8, Expand);
302 setOperationAction(ISD::SELECT_CC , MVT::i16, Expand);
303 setOperationAction(ISD::SELECT_CC , MVT::i32, Expand);
304 setOperationAction(ISD::SELECT_CC , MVT::i64, Expand);
305 if (Subtarget->is64Bit())
306 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Legal);
307 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16 , Legal);
308 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Legal);
309 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
310 setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
312 if (Subtarget->is32Bit() && Subtarget->isTargetKnownWindowsMSVC()) {
313 // On 32 bit MSVC, `fmodf(f32)` is not defined - only `fmod(f64)`
314 // is. We should promote the value to 64-bits to solve this.
315 // This is what the CRT headers do - `fmodf` is an inline header
316 // function casting to f64 and calling `fmod`.
317 setOperationAction(ISD::FREM , MVT::f32 , Promote);
319 setOperationAction(ISD::FREM , MVT::f32 , Expand);
322 setOperationAction(ISD::FREM , MVT::f64 , Expand);
323 setOperationAction(ISD::FREM , MVT::f80 , Expand);
324 setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
326 // Promote the i8 variants and force them on up to i32 which has a shorter
328 setOperationAction(ISD::CTTZ , MVT::i8 , Promote);
329 AddPromotedToType (ISD::CTTZ , MVT::i8 , MVT::i32);
330 setOperationAction(ISD::CTTZ_ZERO_UNDEF , MVT::i8 , Promote);
331 AddPromotedToType (ISD::CTTZ_ZERO_UNDEF , MVT::i8 , MVT::i32);
332 if (Subtarget->hasBMI()) {
333 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16 , Expand);
334 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32 , Expand);
335 if (Subtarget->is64Bit())
336 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
338 setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
339 setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
340 if (Subtarget->is64Bit())
341 setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
344 if (Subtarget->hasLZCNT()) {
345 // When promoting the i8 variants, force them to i32 for a shorter
347 setOperationAction(ISD::CTLZ , MVT::i8 , Promote);
348 AddPromotedToType (ISD::CTLZ , MVT::i8 , MVT::i32);
349 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Promote);
350 AddPromotedToType (ISD::CTLZ_ZERO_UNDEF, MVT::i8 , MVT::i32);
351 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Expand);
352 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Expand);
353 if (Subtarget->is64Bit())
354 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
356 setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
357 setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
358 setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
359 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Custom);
360 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Custom);
361 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Custom);
362 if (Subtarget->is64Bit()) {
363 setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
364 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Custom);
368 // Special handling for half-precision floating point conversions.
369 // If we don't have F16C support, then lower half float conversions
370 // into library calls.
371 if (Subtarget->useSoftFloat() || !Subtarget->hasF16C()) {
372 setOperationAction(ISD::FP16_TO_FP, MVT::f32, Expand);
373 setOperationAction(ISD::FP_TO_FP16, MVT::f32, Expand);
376 // There's never any support for operations beyond MVT::f32.
377 setOperationAction(ISD::FP16_TO_FP, MVT::f64, Expand);
378 setOperationAction(ISD::FP16_TO_FP, MVT::f80, Expand);
379 setOperationAction(ISD::FP_TO_FP16, MVT::f64, Expand);
380 setOperationAction(ISD::FP_TO_FP16, MVT::f80, Expand);
382 setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
383 setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f16, Expand);
384 setLoadExtAction(ISD::EXTLOAD, MVT::f80, MVT::f16, Expand);
385 setTruncStoreAction(MVT::f32, MVT::f16, Expand);
386 setTruncStoreAction(MVT::f64, MVT::f16, Expand);
387 setTruncStoreAction(MVT::f80, MVT::f16, Expand);
389 if (Subtarget->hasPOPCNT()) {
390 setOperationAction(ISD::CTPOP , MVT::i8 , Promote);
392 setOperationAction(ISD::CTPOP , MVT::i8 , Expand);
393 setOperationAction(ISD::CTPOP , MVT::i16 , Expand);
394 setOperationAction(ISD::CTPOP , MVT::i32 , Expand);
395 if (Subtarget->is64Bit())
396 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
399 setOperationAction(ISD::READCYCLECOUNTER , MVT::i64 , Custom);
401 if (!Subtarget->hasMOVBE())
402 setOperationAction(ISD::BSWAP , MVT::i16 , Expand);
404 // These should be promoted to a larger select which is supported.
405 setOperationAction(ISD::SELECT , MVT::i1 , Promote);
406 // X86 wants to expand cmov itself.
407 setOperationAction(ISD::SELECT , MVT::i8 , Custom);
408 setOperationAction(ISD::SELECT , MVT::i16 , Custom);
409 setOperationAction(ISD::SELECT , MVT::i32 , Custom);
410 setOperationAction(ISD::SELECT , MVT::f32 , Custom);
411 setOperationAction(ISD::SELECT , MVT::f64 , Custom);
412 setOperationAction(ISD::SELECT , MVT::f80 , Custom);
413 setOperationAction(ISD::SETCC , MVT::i8 , Custom);
414 setOperationAction(ISD::SETCC , MVT::i16 , Custom);
415 setOperationAction(ISD::SETCC , MVT::i32 , Custom);
416 setOperationAction(ISD::SETCC , MVT::f32 , Custom);
417 setOperationAction(ISD::SETCC , MVT::f64 , Custom);
418 setOperationAction(ISD::SETCC , MVT::f80 , Custom);
419 if (Subtarget->is64Bit()) {
420 setOperationAction(ISD::SELECT , MVT::i64 , Custom);
421 setOperationAction(ISD::SETCC , MVT::i64 , Custom);
423 setOperationAction(ISD::EH_RETURN , MVT::Other, Custom);
424 // NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
425 // SjLj exception handling but a light-weight setjmp/longjmp replacement to
426 // support continuation, user-level threading, and etc.. As a result, no
427 // other SjLj exception interfaces are implemented and please don't build
428 // your own exception handling based on them.
429 // LLVM/Clang supports zero-cost DWARF exception handling.
430 setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
431 setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
434 setOperationAction(ISD::ConstantPool , MVT::i32 , Custom);
435 setOperationAction(ISD::JumpTable , MVT::i32 , Custom);
436 setOperationAction(ISD::GlobalAddress , MVT::i32 , Custom);
437 setOperationAction(ISD::GlobalTLSAddress, MVT::i32 , Custom);
438 if (Subtarget->is64Bit())
439 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
440 setOperationAction(ISD::ExternalSymbol , MVT::i32 , Custom);
441 setOperationAction(ISD::BlockAddress , MVT::i32 , Custom);
442 if (Subtarget->is64Bit()) {
443 setOperationAction(ISD::ConstantPool , MVT::i64 , Custom);
444 setOperationAction(ISD::JumpTable , MVT::i64 , Custom);
445 setOperationAction(ISD::GlobalAddress , MVT::i64 , Custom);
446 setOperationAction(ISD::ExternalSymbol, MVT::i64 , Custom);
447 setOperationAction(ISD::BlockAddress , MVT::i64 , Custom);
449 // 64-bit addm sub, shl, sra, srl (iff 32-bit x86)
450 setOperationAction(ISD::SHL_PARTS , MVT::i32 , Custom);
451 setOperationAction(ISD::SRA_PARTS , MVT::i32 , Custom);
452 setOperationAction(ISD::SRL_PARTS , MVT::i32 , Custom);
453 if (Subtarget->is64Bit()) {
454 setOperationAction(ISD::SHL_PARTS , MVT::i64 , Custom);
455 setOperationAction(ISD::SRA_PARTS , MVT::i64 , Custom);
456 setOperationAction(ISD::SRL_PARTS , MVT::i64 , Custom);
459 if (Subtarget->hasSSE1())
460 setOperationAction(ISD::PREFETCH , MVT::Other, Legal);
462 setOperationAction(ISD::ATOMIC_FENCE , MVT::Other, Custom);
464 // Expand certain atomics
465 for (unsigned i = 0; i != array_lengthof(IntVTs); ++i) {
467 setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, VT, Custom);
468 setOperationAction(ISD::ATOMIC_LOAD_SUB, VT, Custom);
469 setOperationAction(ISD::ATOMIC_STORE, VT, Custom);
472 if (Subtarget->hasCmpxchg16b()) {
473 setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, MVT::i128, Custom);
476 // FIXME - use subtarget debug flags
477 if (!Subtarget->isTargetDarwin() && !Subtarget->isTargetELF() &&
478 !Subtarget->isTargetCygMing() && !Subtarget->isTargetWin64()) {
479 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
482 if (Subtarget->isTarget64BitLP64()) {
483 setExceptionPointerRegister(X86::RAX);
484 setExceptionSelectorRegister(X86::RDX);
486 setExceptionPointerRegister(X86::EAX);
487 setExceptionSelectorRegister(X86::EDX);
489 setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i32, Custom);
490 setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i64, Custom);
492 setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
493 setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
495 setOperationAction(ISD::TRAP, MVT::Other, Legal);
496 setOperationAction(ISD::DEBUGTRAP, MVT::Other, Legal);
498 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
499 setOperationAction(ISD::VASTART , MVT::Other, Custom);
500 setOperationAction(ISD::VAEND , MVT::Other, Expand);
501 if (Subtarget->is64Bit()) {
502 setOperationAction(ISD::VAARG , MVT::Other, Custom);
503 setOperationAction(ISD::VACOPY , MVT::Other, Custom);
505 // TargetInfo::CharPtrBuiltinVaList
506 setOperationAction(ISD::VAARG , MVT::Other, Expand);
507 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
510 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
511 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
513 setOperationAction(ISD::DYNAMIC_STACKALLOC, PtrVT, Custom);
515 // GC_TRANSITION_START and GC_TRANSITION_END need custom lowering.
516 setOperationAction(ISD::GC_TRANSITION_START, MVT::Other, Custom);
517 setOperationAction(ISD::GC_TRANSITION_END, MVT::Other, Custom);
519 if (!Subtarget->useSoftFloat() && X86ScalarSSEf64) {
520 // f32 and f64 use SSE.
521 // Set up the FP register classes.
522 addRegisterClass(MVT::f32, &X86::FR32RegClass);
523 addRegisterClass(MVT::f64, &X86::FR64RegClass);
525 // Use ANDPD to simulate FABS.
526 setOperationAction(ISD::FABS , MVT::f64, Custom);
527 setOperationAction(ISD::FABS , MVT::f32, Custom);
529 // Use XORP to simulate FNEG.
530 setOperationAction(ISD::FNEG , MVT::f64, Custom);
531 setOperationAction(ISD::FNEG , MVT::f32, Custom);
533 // Use ANDPD and ORPD to simulate FCOPYSIGN.
534 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
535 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
537 // Lower this to FGETSIGNx86 plus an AND.
538 setOperationAction(ISD::FGETSIGN, MVT::i64, Custom);
539 setOperationAction(ISD::FGETSIGN, MVT::i32, Custom);
541 // We don't support sin/cos/fmod
542 setOperationAction(ISD::FSIN , MVT::f64, Expand);
543 setOperationAction(ISD::FCOS , MVT::f64, Expand);
544 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
545 setOperationAction(ISD::FSIN , MVT::f32, Expand);
546 setOperationAction(ISD::FCOS , MVT::f32, Expand);
547 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
549 // Expand FP immediates into loads from the stack, except for the special
551 addLegalFPImmediate(APFloat(+0.0)); // xorpd
552 addLegalFPImmediate(APFloat(+0.0f)); // xorps
553 } else if (!Subtarget->useSoftFloat() && X86ScalarSSEf32) {
554 // Use SSE for f32, x87 for f64.
555 // Set up the FP register classes.
556 addRegisterClass(MVT::f32, &X86::FR32RegClass);
557 addRegisterClass(MVT::f64, &X86::RFP64RegClass);
559 // Use ANDPS to simulate FABS.
560 setOperationAction(ISD::FABS , MVT::f32, Custom);
562 // Use XORP to simulate FNEG.
563 setOperationAction(ISD::FNEG , MVT::f32, Custom);
565 setOperationAction(ISD::UNDEF, MVT::f64, Expand);
567 // Use ANDPS and ORPS to simulate FCOPYSIGN.
568 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
569 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
571 // We don't support sin/cos/fmod
572 setOperationAction(ISD::FSIN , MVT::f32, Expand);
573 setOperationAction(ISD::FCOS , MVT::f32, Expand);
574 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
576 // Special cases we handle for FP constants.
577 addLegalFPImmediate(APFloat(+0.0f)); // xorps
578 addLegalFPImmediate(APFloat(+0.0)); // FLD0
579 addLegalFPImmediate(APFloat(+1.0)); // FLD1
580 addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
581 addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
583 if (!TM.Options.UnsafeFPMath) {
584 setOperationAction(ISD::FSIN , MVT::f64, Expand);
585 setOperationAction(ISD::FCOS , MVT::f64, Expand);
586 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
588 } else if (!Subtarget->useSoftFloat()) {
589 // f32 and f64 in x87.
590 // Set up the FP register classes.
591 addRegisterClass(MVT::f64, &X86::RFP64RegClass);
592 addRegisterClass(MVT::f32, &X86::RFP32RegClass);
594 setOperationAction(ISD::UNDEF, MVT::f64, Expand);
595 setOperationAction(ISD::UNDEF, MVT::f32, Expand);
596 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
597 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
599 if (!TM.Options.UnsafeFPMath) {
600 setOperationAction(ISD::FSIN , MVT::f64, Expand);
601 setOperationAction(ISD::FSIN , MVT::f32, Expand);
602 setOperationAction(ISD::FCOS , MVT::f64, Expand);
603 setOperationAction(ISD::FCOS , MVT::f32, Expand);
604 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
605 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
607 addLegalFPImmediate(APFloat(+0.0)); // FLD0
608 addLegalFPImmediate(APFloat(+1.0)); // FLD1
609 addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
610 addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
611 addLegalFPImmediate(APFloat(+0.0f)); // FLD0
612 addLegalFPImmediate(APFloat(+1.0f)); // FLD1
613 addLegalFPImmediate(APFloat(-0.0f)); // FLD0/FCHS
614 addLegalFPImmediate(APFloat(-1.0f)); // FLD1/FCHS
617 // We don't support FMA.
618 setOperationAction(ISD::FMA, MVT::f64, Expand);
619 setOperationAction(ISD::FMA, MVT::f32, Expand);
621 // Long double always uses X87.
622 if (!Subtarget->useSoftFloat()) {
623 addRegisterClass(MVT::f80, &X86::RFP80RegClass);
624 setOperationAction(ISD::UNDEF, MVT::f80, Expand);
625 setOperationAction(ISD::FCOPYSIGN, MVT::f80, Expand);
627 APFloat TmpFlt = APFloat::getZero(APFloat::x87DoubleExtended);
628 addLegalFPImmediate(TmpFlt); // FLD0
630 addLegalFPImmediate(TmpFlt); // FLD0/FCHS
633 APFloat TmpFlt2(+1.0);
634 TmpFlt2.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
636 addLegalFPImmediate(TmpFlt2); // FLD1
637 TmpFlt2.changeSign();
638 addLegalFPImmediate(TmpFlt2); // FLD1/FCHS
641 if (!TM.Options.UnsafeFPMath) {
642 setOperationAction(ISD::FSIN , MVT::f80, Expand);
643 setOperationAction(ISD::FCOS , MVT::f80, Expand);
644 setOperationAction(ISD::FSINCOS, MVT::f80, Expand);
647 setOperationAction(ISD::FFLOOR, MVT::f80, Expand);
648 setOperationAction(ISD::FCEIL, MVT::f80, Expand);
649 setOperationAction(ISD::FTRUNC, MVT::f80, Expand);
650 setOperationAction(ISD::FRINT, MVT::f80, Expand);
651 setOperationAction(ISD::FNEARBYINT, MVT::f80, Expand);
652 setOperationAction(ISD::FMA, MVT::f80, Expand);
655 // Always use a library call for pow.
656 setOperationAction(ISD::FPOW , MVT::f32 , Expand);
657 setOperationAction(ISD::FPOW , MVT::f64 , Expand);
658 setOperationAction(ISD::FPOW , MVT::f80 , Expand);
660 setOperationAction(ISD::FLOG, MVT::f80, Expand);
661 setOperationAction(ISD::FLOG2, MVT::f80, Expand);
662 setOperationAction(ISD::FLOG10, MVT::f80, Expand);
663 setOperationAction(ISD::FEXP, MVT::f80, Expand);
664 setOperationAction(ISD::FEXP2, MVT::f80, Expand);
665 setOperationAction(ISD::FMINNUM, MVT::f80, Expand);
666 setOperationAction(ISD::FMAXNUM, MVT::f80, Expand);
668 // First set operation action for all vector types to either promote
669 // (for widening) or expand (for scalarization). Then we will selectively
670 // turn on ones that can be effectively codegen'd.
671 for (MVT VT : MVT::vector_valuetypes()) {
672 setOperationAction(ISD::ADD , VT, Expand);
673 setOperationAction(ISD::SUB , VT, Expand);
674 setOperationAction(ISD::FADD, VT, Expand);
675 setOperationAction(ISD::FNEG, VT, Expand);
676 setOperationAction(ISD::FSUB, VT, Expand);
677 setOperationAction(ISD::MUL , VT, Expand);
678 setOperationAction(ISD::FMUL, VT, Expand);
679 setOperationAction(ISD::SDIV, VT, Expand);
680 setOperationAction(ISD::UDIV, VT, Expand);
681 setOperationAction(ISD::FDIV, VT, Expand);
682 setOperationAction(ISD::SREM, VT, Expand);
683 setOperationAction(ISD::UREM, VT, Expand);
684 setOperationAction(ISD::LOAD, VT, Expand);
685 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Expand);
686 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT,Expand);
687 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
688 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT,Expand);
689 setOperationAction(ISD::INSERT_SUBVECTOR, VT,Expand);
690 setOperationAction(ISD::FABS, VT, Expand);
691 setOperationAction(ISD::FSIN, VT, Expand);
692 setOperationAction(ISD::FSINCOS, VT, Expand);
693 setOperationAction(ISD::FCOS, VT, Expand);
694 setOperationAction(ISD::FSINCOS, VT, Expand);
695 setOperationAction(ISD::FREM, VT, Expand);
696 setOperationAction(ISD::FMA, VT, Expand);
697 setOperationAction(ISD::FPOWI, VT, Expand);
698 setOperationAction(ISD::FSQRT, VT, Expand);
699 setOperationAction(ISD::FCOPYSIGN, VT, Expand);
700 setOperationAction(ISD::FFLOOR, VT, Expand);
701 setOperationAction(ISD::FCEIL, VT, Expand);
702 setOperationAction(ISD::FTRUNC, VT, Expand);
703 setOperationAction(ISD::FRINT, VT, Expand);
704 setOperationAction(ISD::FNEARBYINT, VT, Expand);
705 setOperationAction(ISD::SMUL_LOHI, VT, Expand);
706 setOperationAction(ISD::MULHS, VT, Expand);
707 setOperationAction(ISD::UMUL_LOHI, VT, Expand);
708 setOperationAction(ISD::MULHU, VT, Expand);
709 setOperationAction(ISD::SDIVREM, VT, Expand);
710 setOperationAction(ISD::UDIVREM, VT, Expand);
711 setOperationAction(ISD::FPOW, VT, Expand);
712 setOperationAction(ISD::CTPOP, VT, Expand);
713 setOperationAction(ISD::CTTZ, VT, Expand);
714 setOperationAction(ISD::CTTZ_ZERO_UNDEF, VT, Expand);
715 setOperationAction(ISD::CTLZ, VT, Expand);
716 setOperationAction(ISD::CTLZ_ZERO_UNDEF, VT, Expand);
717 setOperationAction(ISD::SHL, VT, Expand);
718 setOperationAction(ISD::SRA, VT, Expand);
719 setOperationAction(ISD::SRL, VT, Expand);
720 setOperationAction(ISD::ROTL, VT, Expand);
721 setOperationAction(ISD::ROTR, VT, Expand);
722 setOperationAction(ISD::BSWAP, VT, Expand);
723 setOperationAction(ISD::SETCC, VT, Expand);
724 setOperationAction(ISD::FLOG, VT, Expand);
725 setOperationAction(ISD::FLOG2, VT, Expand);
726 setOperationAction(ISD::FLOG10, VT, Expand);
727 setOperationAction(ISD::FEXP, VT, Expand);
728 setOperationAction(ISD::FEXP2, VT, Expand);
729 setOperationAction(ISD::FP_TO_UINT, VT, Expand);
730 setOperationAction(ISD::FP_TO_SINT, VT, Expand);
731 setOperationAction(ISD::UINT_TO_FP, VT, Expand);
732 setOperationAction(ISD::SINT_TO_FP, VT, Expand);
733 setOperationAction(ISD::SIGN_EXTEND_INREG, VT,Expand);
734 setOperationAction(ISD::TRUNCATE, VT, Expand);
735 setOperationAction(ISD::SIGN_EXTEND, VT, Expand);
736 setOperationAction(ISD::ZERO_EXTEND, VT, Expand);
737 setOperationAction(ISD::ANY_EXTEND, VT, Expand);
738 setOperationAction(ISD::VSELECT, VT, Expand);
739 setOperationAction(ISD::SELECT_CC, VT, Expand);
740 for (MVT InnerVT : MVT::vector_valuetypes()) {
741 setTruncStoreAction(InnerVT, VT, Expand);
743 setLoadExtAction(ISD::SEXTLOAD, InnerVT, VT, Expand);
744 setLoadExtAction(ISD::ZEXTLOAD, InnerVT, VT, Expand);
746 // N.b. ISD::EXTLOAD legality is basically ignored except for i1-like
747 // types, we have to deal with them whether we ask for Expansion or not.
748 // Setting Expand causes its own optimisation problems though, so leave
750 if (VT.getVectorElementType() == MVT::i1)
751 setLoadExtAction(ISD::EXTLOAD, InnerVT, VT, Expand);
753 // EXTLOAD for MVT::f16 vectors is not legal because f16 vectors are
754 // split/scalarized right now.
755 if (VT.getVectorElementType() == MVT::f16)
756 setLoadExtAction(ISD::EXTLOAD, InnerVT, VT, Expand);
760 // FIXME: In order to prevent SSE instructions being expanded to MMX ones
761 // with -msoft-float, disable use of MMX as well.
762 if (!Subtarget->useSoftFloat() && Subtarget->hasMMX()) {
763 addRegisterClass(MVT::x86mmx, &X86::VR64RegClass);
764 // No operations on x86mmx supported, everything uses intrinsics.
767 // MMX-sized vectors (other than x86mmx) are expected to be expanded
768 // into smaller operations.
769 for (MVT MMXTy : {MVT::v8i8, MVT::v4i16, MVT::v2i32, MVT::v1i64}) {
770 setOperationAction(ISD::MULHS, MMXTy, Expand);
771 setOperationAction(ISD::AND, MMXTy, Expand);
772 setOperationAction(ISD::OR, MMXTy, Expand);
773 setOperationAction(ISD::XOR, MMXTy, Expand);
774 setOperationAction(ISD::SCALAR_TO_VECTOR, MMXTy, Expand);
775 setOperationAction(ISD::SELECT, MMXTy, Expand);
776 setOperationAction(ISD::BITCAST, MMXTy, Expand);
778 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v1i64, Expand);
780 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE1()) {
781 addRegisterClass(MVT::v4f32, &X86::VR128RegClass);
783 setOperationAction(ISD::FADD, MVT::v4f32, Legal);
784 setOperationAction(ISD::FSUB, MVT::v4f32, Legal);
785 setOperationAction(ISD::FMUL, MVT::v4f32, Legal);
786 setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
787 setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
788 setOperationAction(ISD::FNEG, MVT::v4f32, Custom);
789 setOperationAction(ISD::FABS, MVT::v4f32, Custom);
790 setOperationAction(ISD::LOAD, MVT::v4f32, Legal);
791 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
792 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4f32, Custom);
793 setOperationAction(ISD::VSELECT, MVT::v4f32, Custom);
794 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
795 setOperationAction(ISD::SELECT, MVT::v4f32, Custom);
796 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Custom);
799 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE2()) {
800 addRegisterClass(MVT::v2f64, &X86::VR128RegClass);
802 // FIXME: Unfortunately, -soft-float and -no-implicit-float mean XMM
803 // registers cannot be used even for integer operations.
804 addRegisterClass(MVT::v16i8, &X86::VR128RegClass);
805 addRegisterClass(MVT::v8i16, &X86::VR128RegClass);
806 addRegisterClass(MVT::v4i32, &X86::VR128RegClass);
807 addRegisterClass(MVT::v2i64, &X86::VR128RegClass);
809 setOperationAction(ISD::ADD, MVT::v16i8, Legal);
810 setOperationAction(ISD::ADD, MVT::v8i16, Legal);
811 setOperationAction(ISD::ADD, MVT::v4i32, Legal);
812 setOperationAction(ISD::ADD, MVT::v2i64, Legal);
813 setOperationAction(ISD::MUL, MVT::v16i8, Custom);
814 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
815 setOperationAction(ISD::MUL, MVT::v2i64, Custom);
816 setOperationAction(ISD::UMUL_LOHI, MVT::v4i32, Custom);
817 setOperationAction(ISD::SMUL_LOHI, MVT::v4i32, Custom);
818 setOperationAction(ISD::MULHU, MVT::v8i16, Legal);
819 setOperationAction(ISD::MULHS, MVT::v8i16, Legal);
820 setOperationAction(ISD::SUB, MVT::v16i8, Legal);
821 setOperationAction(ISD::SUB, MVT::v8i16, Legal);
822 setOperationAction(ISD::SUB, MVT::v4i32, Legal);
823 setOperationAction(ISD::SUB, MVT::v2i64, Legal);
824 setOperationAction(ISD::MUL, MVT::v8i16, Legal);
825 setOperationAction(ISD::FADD, MVT::v2f64, Legal);
826 setOperationAction(ISD::FSUB, MVT::v2f64, Legal);
827 setOperationAction(ISD::FMUL, MVT::v2f64, Legal);
828 setOperationAction(ISD::FDIV, MVT::v2f64, Legal);
829 setOperationAction(ISD::FSQRT, MVT::v2f64, Legal);
830 setOperationAction(ISD::FNEG, MVT::v2f64, Custom);
831 setOperationAction(ISD::FABS, MVT::v2f64, Custom);
833 setOperationAction(ISD::SMAX, MVT::v8i16, Legal);
834 setOperationAction(ISD::UMAX, MVT::v16i8, Legal);
835 setOperationAction(ISD::SMIN, MVT::v8i16, Legal);
836 setOperationAction(ISD::UMIN, MVT::v16i8, Legal);
838 setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
839 setOperationAction(ISD::SETCC, MVT::v16i8, Custom);
840 setOperationAction(ISD::SETCC, MVT::v8i16, Custom);
841 setOperationAction(ISD::SETCC, MVT::v4i32, Custom);
843 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Custom);
844 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Custom);
845 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
846 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
847 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
849 setOperationAction(ISD::CTPOP, MVT::v16i8, Custom);
850 setOperationAction(ISD::CTPOP, MVT::v8i16, Custom);
851 setOperationAction(ISD::CTPOP, MVT::v4i32, Custom);
852 setOperationAction(ISD::CTPOP, MVT::v2i64, Custom);
854 setOperationAction(ISD::CTTZ, MVT::v16i8, Custom);
855 setOperationAction(ISD::CTTZ, MVT::v8i16, Custom);
856 setOperationAction(ISD::CTTZ, MVT::v4i32, Custom);
857 // ISD::CTTZ v2i64 - scalarization is faster.
858 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i8, Custom);
859 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i16, Custom);
860 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i32, Custom);
861 // ISD::CTTZ_ZERO_UNDEF v2i64 - scalarization is faster.
863 // Custom lower build_vector, vector_shuffle, and extract_vector_elt.
864 for (int i = MVT::v16i8; i != MVT::v2i64; ++i) {
865 MVT VT = (MVT::SimpleValueType)i;
866 // Do not attempt to custom lower non-power-of-2 vectors
867 if (!isPowerOf2_32(VT.getVectorNumElements()))
869 // Do not attempt to custom lower non-128-bit vectors
870 if (!VT.is128BitVector())
872 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
873 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
874 setOperationAction(ISD::VSELECT, VT, Custom);
875 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
878 // We support custom legalizing of sext and anyext loads for specific
879 // memory vector types which we can load as a scalar (or sequence of
880 // scalars) and extend in-register to a legal 128-bit vector type. For sext
881 // loads these must work with a single scalar load.
882 for (MVT VT : MVT::integer_vector_valuetypes()) {
883 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v4i8, Custom);
884 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v4i16, Custom);
885 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v8i8, Custom);
886 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i8, Custom);
887 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i16, Custom);
888 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i32, Custom);
889 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4i8, Custom);
890 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4i16, Custom);
891 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v8i8, Custom);
894 setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64, Custom);
895 setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64, Custom);
896 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f64, Custom);
897 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i64, Custom);
898 setOperationAction(ISD::VSELECT, MVT::v2f64, Custom);
899 setOperationAction(ISD::VSELECT, MVT::v2i64, Custom);
900 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f64, Custom);
901 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Custom);
903 if (Subtarget->is64Bit()) {
904 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
905 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
908 // Promote v16i8, v8i16, v4i32 load, select, and, or, xor to v2i64.
909 for (int i = MVT::v16i8; i != MVT::v2i64; ++i) {
910 MVT VT = (MVT::SimpleValueType)i;
912 // Do not attempt to promote non-128-bit vectors
913 if (!VT.is128BitVector())
916 setOperationAction(ISD::AND, VT, Promote);
917 AddPromotedToType (ISD::AND, VT, MVT::v2i64);
918 setOperationAction(ISD::OR, VT, Promote);
919 AddPromotedToType (ISD::OR, VT, MVT::v2i64);
920 setOperationAction(ISD::XOR, VT, Promote);
921 AddPromotedToType (ISD::XOR, VT, MVT::v2i64);
922 setOperationAction(ISD::LOAD, VT, Promote);
923 AddPromotedToType (ISD::LOAD, VT, MVT::v2i64);
924 setOperationAction(ISD::SELECT, VT, Promote);
925 AddPromotedToType (ISD::SELECT, VT, MVT::v2i64);
928 // Custom lower v2i64 and v2f64 selects.
929 setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
930 setOperationAction(ISD::LOAD, MVT::v2i64, Legal);
931 setOperationAction(ISD::SELECT, MVT::v2f64, Custom);
932 setOperationAction(ISD::SELECT, MVT::v2i64, Custom);
934 setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
935 setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
937 setOperationAction(ISD::SINT_TO_FP, MVT::v2i32, Custom);
939 setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Custom);
940 setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Custom);
941 // As there is no 64-bit GPR available, we need build a special custom
942 // sequence to convert from v2i32 to v2f32.
943 if (!Subtarget->is64Bit())
944 setOperationAction(ISD::UINT_TO_FP, MVT::v2f32, Custom);
946 setOperationAction(ISD::FP_EXTEND, MVT::v2f32, Custom);
947 setOperationAction(ISD::FP_ROUND, MVT::v2f32, Custom);
949 for (MVT VT : MVT::fp_vector_valuetypes())
950 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2f32, Legal);
952 setOperationAction(ISD::BITCAST, MVT::v2i32, Custom);
953 setOperationAction(ISD::BITCAST, MVT::v4i16, Custom);
954 setOperationAction(ISD::BITCAST, MVT::v8i8, Custom);
957 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE41()) {
958 for (MVT RoundedTy : {MVT::f32, MVT::f64, MVT::v4f32, MVT::v2f64}) {
959 setOperationAction(ISD::FFLOOR, RoundedTy, Legal);
960 setOperationAction(ISD::FCEIL, RoundedTy, Legal);
961 setOperationAction(ISD::FTRUNC, RoundedTy, Legal);
962 setOperationAction(ISD::FRINT, RoundedTy, Legal);
963 setOperationAction(ISD::FNEARBYINT, RoundedTy, Legal);
966 setOperationAction(ISD::SMAX, MVT::v16i8, Legal);
967 setOperationAction(ISD::SMAX, MVT::v4i32, Legal);
968 setOperationAction(ISD::UMAX, MVT::v8i16, Legal);
969 setOperationAction(ISD::UMAX, MVT::v4i32, Legal);
970 setOperationAction(ISD::SMIN, MVT::v16i8, Legal);
971 setOperationAction(ISD::SMIN, MVT::v4i32, Legal);
972 setOperationAction(ISD::UMIN, MVT::v8i16, Legal);
973 setOperationAction(ISD::UMIN, MVT::v4i32, Legal);
975 // FIXME: Do we need to handle scalar-to-vector here?
976 setOperationAction(ISD::MUL, MVT::v4i32, Legal);
978 // We directly match byte blends in the backend as they match the VSELECT
980 setOperationAction(ISD::VSELECT, MVT::v16i8, Legal);
982 // SSE41 brings specific instructions for doing vector sign extend even in
983 // cases where we don't have SRA.
984 for (MVT VT : MVT::integer_vector_valuetypes()) {
985 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i8, Custom);
986 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i16, Custom);
987 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i32, Custom);
990 // SSE41 also has vector sign/zero extending loads, PMOV[SZ]X
991 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i16, MVT::v8i8, Legal);
992 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i32, MVT::v4i8, Legal);
993 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i8, Legal);
994 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i32, MVT::v4i16, Legal);
995 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i16, Legal);
996 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i32, Legal);
998 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i16, MVT::v8i8, Legal);
999 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i32, MVT::v4i8, Legal);
1000 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i8, Legal);
1001 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i32, MVT::v4i16, Legal);
1002 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i16, Legal);
1003 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i32, Legal);
1005 // i8 and i16 vectors are custom because the source register and source
1006 // source memory operand types are not the same width. f32 vectors are
1007 // custom since the immediate controlling the insert encodes additional
1009 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Custom);
1010 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
1011 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
1012 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
1014 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i8, Custom);
1015 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i16, Custom);
1016 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Custom);
1017 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
1019 // FIXME: these should be Legal, but that's only for the case where
1020 // the index is constant. For now custom expand to deal with that.
1021 if (Subtarget->is64Bit()) {
1022 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
1023 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
1027 if (Subtarget->hasSSE2()) {
1028 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v2i64, Custom);
1029 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v4i32, Custom);
1030 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v8i16, Custom);
1032 setOperationAction(ISD::SRL, MVT::v8i16, Custom);
1033 setOperationAction(ISD::SRL, MVT::v16i8, Custom);
1035 setOperationAction(ISD::SHL, MVT::v8i16, Custom);
1036 setOperationAction(ISD::SHL, MVT::v16i8, Custom);
1038 setOperationAction(ISD::SRA, MVT::v8i16, Custom);
1039 setOperationAction(ISD::SRA, MVT::v16i8, Custom);
1041 // In the customized shift lowering, the legal cases in AVX2 will be
1043 setOperationAction(ISD::SRL, MVT::v2i64, Custom);
1044 setOperationAction(ISD::SRL, MVT::v4i32, Custom);
1046 setOperationAction(ISD::SHL, MVT::v2i64, Custom);
1047 setOperationAction(ISD::SHL, MVT::v4i32, Custom);
1049 setOperationAction(ISD::SRA, MVT::v2i64, Custom);
1050 setOperationAction(ISD::SRA, MVT::v4i32, Custom);
1053 if (!Subtarget->useSoftFloat() && Subtarget->hasFp256()) {
1054 addRegisterClass(MVT::v32i8, &X86::VR256RegClass);
1055 addRegisterClass(MVT::v16i16, &X86::VR256RegClass);
1056 addRegisterClass(MVT::v8i32, &X86::VR256RegClass);
1057 addRegisterClass(MVT::v8f32, &X86::VR256RegClass);
1058 addRegisterClass(MVT::v4i64, &X86::VR256RegClass);
1059 addRegisterClass(MVT::v4f64, &X86::VR256RegClass);
1061 setOperationAction(ISD::LOAD, MVT::v8f32, Legal);
1062 setOperationAction(ISD::LOAD, MVT::v4f64, Legal);
1063 setOperationAction(ISD::LOAD, MVT::v4i64, Legal);
1065 setOperationAction(ISD::FADD, MVT::v8f32, Legal);
1066 setOperationAction(ISD::FSUB, MVT::v8f32, Legal);
1067 setOperationAction(ISD::FMUL, MVT::v8f32, Legal);
1068 setOperationAction(ISD::FDIV, MVT::v8f32, Legal);
1069 setOperationAction(ISD::FSQRT, MVT::v8f32, Legal);
1070 setOperationAction(ISD::FFLOOR, MVT::v8f32, Legal);
1071 setOperationAction(ISD::FCEIL, MVT::v8f32, Legal);
1072 setOperationAction(ISD::FTRUNC, MVT::v8f32, Legal);
1073 setOperationAction(ISD::FRINT, MVT::v8f32, Legal);
1074 setOperationAction(ISD::FNEARBYINT, MVT::v8f32, Legal);
1075 setOperationAction(ISD::FNEG, MVT::v8f32, Custom);
1076 setOperationAction(ISD::FABS, MVT::v8f32, Custom);
1078 setOperationAction(ISD::FADD, MVT::v4f64, Legal);
1079 setOperationAction(ISD::FSUB, MVT::v4f64, Legal);
1080 setOperationAction(ISD::FMUL, MVT::v4f64, Legal);
1081 setOperationAction(ISD::FDIV, MVT::v4f64, Legal);
1082 setOperationAction(ISD::FSQRT, MVT::v4f64, Legal);
1083 setOperationAction(ISD::FFLOOR, MVT::v4f64, Legal);
1084 setOperationAction(ISD::FCEIL, MVT::v4f64, Legal);
1085 setOperationAction(ISD::FTRUNC, MVT::v4f64, Legal);
1086 setOperationAction(ISD::FRINT, MVT::v4f64, Legal);
1087 setOperationAction(ISD::FNEARBYINT, MVT::v4f64, Legal);
1088 setOperationAction(ISD::FNEG, MVT::v4f64, Custom);
1089 setOperationAction(ISD::FABS, MVT::v4f64, Custom);
1091 // (fp_to_int:v8i16 (v8f32 ..)) requires the result type to be promoted
1092 // even though v8i16 is a legal type.
1093 setOperationAction(ISD::FP_TO_SINT, MVT::v8i16, Promote);
1094 setOperationAction(ISD::FP_TO_UINT, MVT::v8i16, Promote);
1095 setOperationAction(ISD::FP_TO_SINT, MVT::v8i32, Legal);
1097 setOperationAction(ISD::SINT_TO_FP, MVT::v8i16, Promote);
1098 setOperationAction(ISD::SINT_TO_FP, MVT::v8i32, Legal);
1099 setOperationAction(ISD::FP_ROUND, MVT::v4f32, Legal);
1101 setOperationAction(ISD::UINT_TO_FP, MVT::v8i8, Custom);
1102 setOperationAction(ISD::UINT_TO_FP, MVT::v8i16, Custom);
1104 for (MVT VT : MVT::fp_vector_valuetypes())
1105 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4f32, Legal);
1107 setOperationAction(ISD::SRL, MVT::v16i16, Custom);
1108 setOperationAction(ISD::SRL, MVT::v32i8, Custom);
1110 setOperationAction(ISD::SHL, MVT::v16i16, Custom);
1111 setOperationAction(ISD::SHL, MVT::v32i8, Custom);
1113 setOperationAction(ISD::SRA, MVT::v16i16, Custom);
1114 setOperationAction(ISD::SRA, MVT::v32i8, Custom);
1116 setOperationAction(ISD::SETCC, MVT::v32i8, Custom);
1117 setOperationAction(ISD::SETCC, MVT::v16i16, Custom);
1118 setOperationAction(ISD::SETCC, MVT::v8i32, Custom);
1119 setOperationAction(ISD::SETCC, MVT::v4i64, Custom);
1121 setOperationAction(ISD::SELECT, MVT::v4f64, Custom);
1122 setOperationAction(ISD::SELECT, MVT::v4i64, Custom);
1123 setOperationAction(ISD::SELECT, MVT::v8f32, Custom);
1125 setOperationAction(ISD::SIGN_EXTEND, MVT::v4i64, Custom);
1126 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i32, Custom);
1127 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i16, Custom);
1128 setOperationAction(ISD::ZERO_EXTEND, MVT::v4i64, Custom);
1129 setOperationAction(ISD::ZERO_EXTEND, MVT::v8i32, Custom);
1130 setOperationAction(ISD::ZERO_EXTEND, MVT::v16i16, Custom);
1131 setOperationAction(ISD::ANY_EXTEND, MVT::v4i64, Custom);
1132 setOperationAction(ISD::ANY_EXTEND, MVT::v8i32, Custom);
1133 setOperationAction(ISD::ANY_EXTEND, MVT::v16i16, Custom);
1134 setOperationAction(ISD::TRUNCATE, MVT::v16i8, Custom);
1135 setOperationAction(ISD::TRUNCATE, MVT::v8i16, Custom);
1136 setOperationAction(ISD::TRUNCATE, MVT::v4i32, Custom);
1138 setOperationAction(ISD::CTPOP, MVT::v32i8, Custom);
1139 setOperationAction(ISD::CTPOP, MVT::v16i16, Custom);
1140 setOperationAction(ISD::CTPOP, MVT::v8i32, Custom);
1141 setOperationAction(ISD::CTPOP, MVT::v4i64, Custom);
1143 setOperationAction(ISD::CTTZ, MVT::v32i8, Custom);
1144 setOperationAction(ISD::CTTZ, MVT::v16i16, Custom);
1145 setOperationAction(ISD::CTTZ, MVT::v8i32, Custom);
1146 setOperationAction(ISD::CTTZ, MVT::v4i64, Custom);
1147 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v32i8, Custom);
1148 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i16, Custom);
1149 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i32, Custom);
1150 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i64, Custom);
1152 if (Subtarget->hasFMA() || Subtarget->hasFMA4() || Subtarget->hasAVX512()) {
1153 setOperationAction(ISD::FMA, MVT::v8f32, Legal);
1154 setOperationAction(ISD::FMA, MVT::v4f64, Legal);
1155 setOperationAction(ISD::FMA, MVT::v4f32, Legal);
1156 setOperationAction(ISD::FMA, MVT::v2f64, Legal);
1157 setOperationAction(ISD::FMA, MVT::f32, Legal);
1158 setOperationAction(ISD::FMA, MVT::f64, Legal);
1161 if (Subtarget->hasInt256()) {
1162 setOperationAction(ISD::ADD, MVT::v4i64, Legal);
1163 setOperationAction(ISD::ADD, MVT::v8i32, Legal);
1164 setOperationAction(ISD::ADD, MVT::v16i16, Legal);
1165 setOperationAction(ISD::ADD, MVT::v32i8, Legal);
1167 setOperationAction(ISD::SUB, MVT::v4i64, Legal);
1168 setOperationAction(ISD::SUB, MVT::v8i32, Legal);
1169 setOperationAction(ISD::SUB, MVT::v16i16, Legal);
1170 setOperationAction(ISD::SUB, MVT::v32i8, Legal);
1172 setOperationAction(ISD::MUL, MVT::v4i64, Custom);
1173 setOperationAction(ISD::MUL, MVT::v8i32, Legal);
1174 setOperationAction(ISD::MUL, MVT::v16i16, Legal);
1175 setOperationAction(ISD::MUL, MVT::v32i8, Custom);
1177 setOperationAction(ISD::UMUL_LOHI, MVT::v8i32, Custom);
1178 setOperationAction(ISD::SMUL_LOHI, MVT::v8i32, Custom);
1179 setOperationAction(ISD::MULHU, MVT::v16i16, Legal);
1180 setOperationAction(ISD::MULHS, MVT::v16i16, Legal);
1182 setOperationAction(ISD::SMAX, MVT::v32i8, Legal);
1183 setOperationAction(ISD::SMAX, MVT::v16i16, Legal);
1184 setOperationAction(ISD::SMAX, MVT::v8i32, Legal);
1185 setOperationAction(ISD::UMAX, MVT::v32i8, Legal);
1186 setOperationAction(ISD::UMAX, MVT::v16i16, Legal);
1187 setOperationAction(ISD::UMAX, MVT::v8i32, Legal);
1188 setOperationAction(ISD::SMIN, MVT::v32i8, Legal);
1189 setOperationAction(ISD::SMIN, MVT::v16i16, Legal);
1190 setOperationAction(ISD::SMIN, MVT::v8i32, Legal);
1191 setOperationAction(ISD::UMIN, MVT::v32i8, Legal);
1192 setOperationAction(ISD::UMIN, MVT::v16i16, Legal);
1193 setOperationAction(ISD::UMIN, MVT::v8i32, Legal);
1195 // The custom lowering for UINT_TO_FP for v8i32 becomes interesting
1196 // when we have a 256bit-wide blend with immediate.
1197 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Custom);
1199 // AVX2 also has wider vector sign/zero extending loads, VPMOV[SZ]X
1200 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i16, MVT::v16i8, Legal);
1201 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i32, MVT::v8i8, Legal);
1202 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i8, Legal);
1203 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i32, MVT::v8i16, Legal);
1204 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i16, Legal);
1205 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i32, Legal);
1207 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i16, MVT::v16i8, Legal);
1208 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i32, MVT::v8i8, Legal);
1209 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i8, Legal);
1210 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i32, MVT::v8i16, Legal);
1211 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i16, Legal);
1212 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i32, Legal);
1214 setOperationAction(ISD::ADD, MVT::v4i64, Custom);
1215 setOperationAction(ISD::ADD, MVT::v8i32, Custom);
1216 setOperationAction(ISD::ADD, MVT::v16i16, Custom);
1217 setOperationAction(ISD::ADD, MVT::v32i8, Custom);
1219 setOperationAction(ISD::SUB, MVT::v4i64, Custom);
1220 setOperationAction(ISD::SUB, MVT::v8i32, Custom);
1221 setOperationAction(ISD::SUB, MVT::v16i16, Custom);
1222 setOperationAction(ISD::SUB, MVT::v32i8, Custom);
1224 setOperationAction(ISD::MUL, MVT::v4i64, Custom);
1225 setOperationAction(ISD::MUL, MVT::v8i32, Custom);
1226 setOperationAction(ISD::MUL, MVT::v16i16, Custom);
1227 setOperationAction(ISD::MUL, MVT::v32i8, Custom);
1229 setOperationAction(ISD::SMAX, MVT::v32i8, Custom);
1230 setOperationAction(ISD::SMAX, MVT::v16i16, Custom);
1231 setOperationAction(ISD::SMAX, MVT::v8i32, Custom);
1232 setOperationAction(ISD::UMAX, MVT::v32i8, Custom);
1233 setOperationAction(ISD::UMAX, MVT::v16i16, Custom);
1234 setOperationAction(ISD::UMAX, MVT::v8i32, Custom);
1235 setOperationAction(ISD::SMIN, MVT::v32i8, Custom);
1236 setOperationAction(ISD::SMIN, MVT::v16i16, Custom);
1237 setOperationAction(ISD::SMIN, MVT::v8i32, Custom);
1238 setOperationAction(ISD::UMIN, MVT::v32i8, Custom);
1239 setOperationAction(ISD::UMIN, MVT::v16i16, Custom);
1240 setOperationAction(ISD::UMIN, MVT::v8i32, Custom);
1243 // In the customized shift lowering, the legal cases in AVX2 will be
1245 setOperationAction(ISD::SRL, MVT::v4i64, Custom);
1246 setOperationAction(ISD::SRL, MVT::v8i32, Custom);
1248 setOperationAction(ISD::SHL, MVT::v4i64, Custom);
1249 setOperationAction(ISD::SHL, MVT::v8i32, Custom);
1251 setOperationAction(ISD::SRA, MVT::v4i64, Custom);
1252 setOperationAction(ISD::SRA, MVT::v8i32, Custom);
1254 // Custom lower several nodes for 256-bit types.
1255 for (MVT VT : MVT::vector_valuetypes()) {
1256 if (VT.getScalarSizeInBits() >= 32) {
1257 setOperationAction(ISD::MLOAD, VT, Legal);
1258 setOperationAction(ISD::MSTORE, VT, Legal);
1260 // Extract subvector is special because the value type
1261 // (result) is 128-bit but the source is 256-bit wide.
1262 if (VT.is128BitVector()) {
1263 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Custom);
1265 // Do not attempt to custom lower other non-256-bit vectors
1266 if (!VT.is256BitVector())
1269 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1270 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
1271 setOperationAction(ISD::VSELECT, VT, Custom);
1272 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Custom);
1273 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
1274 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Custom);
1275 setOperationAction(ISD::INSERT_SUBVECTOR, VT, Custom);
1276 setOperationAction(ISD::CONCAT_VECTORS, VT, Custom);
1279 if (Subtarget->hasInt256())
1280 setOperationAction(ISD::VSELECT, MVT::v32i8, Legal);
1282 // Promote v32i8, v16i16, v8i32 select, and, or, xor to v4i64.
1283 for (int i = MVT::v32i8; i != MVT::v4i64; ++i) {
1284 MVT VT = (MVT::SimpleValueType)i;
1286 // Do not attempt to promote non-256-bit vectors
1287 if (!VT.is256BitVector())
1290 setOperationAction(ISD::AND, VT, Promote);
1291 AddPromotedToType (ISD::AND, VT, MVT::v4i64);
1292 setOperationAction(ISD::OR, VT, Promote);
1293 AddPromotedToType (ISD::OR, VT, MVT::v4i64);
1294 setOperationAction(ISD::XOR, VT, Promote);
1295 AddPromotedToType (ISD::XOR, VT, MVT::v4i64);
1296 setOperationAction(ISD::LOAD, VT, Promote);
1297 AddPromotedToType (ISD::LOAD, VT, MVT::v4i64);
1298 setOperationAction(ISD::SELECT, VT, Promote);
1299 AddPromotedToType (ISD::SELECT, VT, MVT::v4i64);
1303 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512()) {
1304 addRegisterClass(MVT::v16i32, &X86::VR512RegClass);
1305 addRegisterClass(MVT::v16f32, &X86::VR512RegClass);
1306 addRegisterClass(MVT::v8i64, &X86::VR512RegClass);
1307 addRegisterClass(MVT::v8f64, &X86::VR512RegClass);
1309 addRegisterClass(MVT::i1, &X86::VK1RegClass);
1310 addRegisterClass(MVT::v8i1, &X86::VK8RegClass);
1311 addRegisterClass(MVT::v16i1, &X86::VK16RegClass);
1313 for (MVT VT : MVT::fp_vector_valuetypes())
1314 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v8f32, Legal);
1316 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i32, MVT::v16i8, Legal);
1317 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i32, MVT::v16i8, Legal);
1318 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i32, MVT::v16i16, Legal);
1319 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i32, MVT::v16i16, Legal);
1320 setLoadExtAction(ISD::ZEXTLOAD, MVT::v32i16, MVT::v32i8, Legal);
1321 setLoadExtAction(ISD::SEXTLOAD, MVT::v32i16, MVT::v32i8, Legal);
1322 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i8, Legal);
1323 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i8, Legal);
1324 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i16, Legal);
1325 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i16, Legal);
1326 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i32, Legal);
1327 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i32, Legal);
1329 setOperationAction(ISD::BR_CC, MVT::i1, Expand);
1330 setOperationAction(ISD::SETCC, MVT::i1, Custom);
1331 setOperationAction(ISD::XOR, MVT::i1, Legal);
1332 setOperationAction(ISD::OR, MVT::i1, Legal);
1333 setOperationAction(ISD::AND, MVT::i1, Legal);
1334 setOperationAction(ISD::SUB, MVT::i1, Custom);
1335 setOperationAction(ISD::ADD, MVT::i1, Custom);
1336 setOperationAction(ISD::MUL, MVT::i1, Custom);
1337 setOperationAction(ISD::LOAD, MVT::v16f32, Legal);
1338 setOperationAction(ISD::LOAD, MVT::v8f64, Legal);
1339 setOperationAction(ISD::LOAD, MVT::v8i64, Legal);
1340 setOperationAction(ISD::LOAD, MVT::v16i32, Legal);
1341 setOperationAction(ISD::LOAD, MVT::v16i1, Legal);
1343 setOperationAction(ISD::FADD, MVT::v16f32, Legal);
1344 setOperationAction(ISD::FSUB, MVT::v16f32, Legal);
1345 setOperationAction(ISD::FMUL, MVT::v16f32, Legal);
1346 setOperationAction(ISD::FDIV, MVT::v16f32, Legal);
1347 setOperationAction(ISD::FSQRT, MVT::v16f32, Legal);
1348 setOperationAction(ISD::FNEG, MVT::v16f32, Custom);
1350 setOperationAction(ISD::FADD, MVT::v8f64, Legal);
1351 setOperationAction(ISD::FSUB, MVT::v8f64, Legal);
1352 setOperationAction(ISD::FMUL, MVT::v8f64, Legal);
1353 setOperationAction(ISD::FDIV, MVT::v8f64, Legal);
1354 setOperationAction(ISD::FSQRT, MVT::v8f64, Legal);
1355 setOperationAction(ISD::FNEG, MVT::v8f64, Custom);
1356 setOperationAction(ISD::FMA, MVT::v8f64, Legal);
1357 setOperationAction(ISD::FMA, MVT::v16f32, Legal);
1359 setOperationAction(ISD::FP_TO_SINT, MVT::v16i32, Legal);
1360 setOperationAction(ISD::FP_TO_UINT, MVT::v16i32, Legal);
1361 setOperationAction(ISD::FP_TO_UINT, MVT::v8i32, Legal);
1362 setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
1363 setOperationAction(ISD::SINT_TO_FP, MVT::v16i32, Legal);
1364 setOperationAction(ISD::SINT_TO_FP, MVT::v8i1, Custom);
1365 setOperationAction(ISD::SINT_TO_FP, MVT::v16i1, Custom);
1366 setOperationAction(ISD::SINT_TO_FP, MVT::v16i8, Promote);
1367 setOperationAction(ISD::SINT_TO_FP, MVT::v16i16, Promote);
1368 setOperationAction(ISD::UINT_TO_FP, MVT::v16i32, Legal);
1369 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Legal);
1370 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
1371 setOperationAction(ISD::UINT_TO_FP, MVT::v16i8, Custom);
1372 setOperationAction(ISD::UINT_TO_FP, MVT::v16i16, Custom);
1373 setOperationAction(ISD::FP_ROUND, MVT::v8f32, Legal);
1374 setOperationAction(ISD::FP_EXTEND, MVT::v8f32, Legal);
1376 setTruncStoreAction(MVT::v8i64, MVT::v8i8, Legal);
1377 setTruncStoreAction(MVT::v8i64, MVT::v8i16, Legal);
1378 setTruncStoreAction(MVT::v8i64, MVT::v8i32, Legal);
1379 setTruncStoreAction(MVT::v16i32, MVT::v16i8, Legal);
1380 setTruncStoreAction(MVT::v16i32, MVT::v16i16, Legal);
1381 if (Subtarget->hasVLX()){
1382 setTruncStoreAction(MVT::v4i64, MVT::v4i8, Legal);
1383 setTruncStoreAction(MVT::v4i64, MVT::v4i16, Legal);
1384 setTruncStoreAction(MVT::v4i64, MVT::v4i32, Legal);
1385 setTruncStoreAction(MVT::v8i32, MVT::v8i8, Legal);
1386 setTruncStoreAction(MVT::v8i32, MVT::v8i16, Legal);
1388 setTruncStoreAction(MVT::v2i64, MVT::v2i8, Legal);
1389 setTruncStoreAction(MVT::v2i64, MVT::v2i16, Legal);
1390 setTruncStoreAction(MVT::v2i64, MVT::v2i32, Legal);
1391 setTruncStoreAction(MVT::v4i32, MVT::v4i8, Legal);
1392 setTruncStoreAction(MVT::v4i32, MVT::v4i16, Legal);
1394 setOperationAction(ISD::TRUNCATE, MVT::i1, Custom);
1395 setOperationAction(ISD::TRUNCATE, MVT::v16i8, Custom);
1396 setOperationAction(ISD::TRUNCATE, MVT::v8i32, Custom);
1397 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8i1, Custom);
1398 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i1, Custom);
1399 if (Subtarget->hasDQI()) {
1400 setOperationAction(ISD::TRUNCATE, MVT::v2i1, Custom);
1401 setOperationAction(ISD::TRUNCATE, MVT::v4i1, Custom);
1403 setOperationAction(ISD::SINT_TO_FP, MVT::v8i64, Legal);
1404 setOperationAction(ISD::UINT_TO_FP, MVT::v8i64, Legal);
1405 setOperationAction(ISD::FP_TO_SINT, MVT::v8i64, Legal);
1406 setOperationAction(ISD::FP_TO_UINT, MVT::v8i64, Legal);
1407 if (Subtarget->hasVLX()) {
1408 setOperationAction(ISD::SINT_TO_FP, MVT::v4i64, Legal);
1409 setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Legal);
1410 setOperationAction(ISD::UINT_TO_FP, MVT::v4i64, Legal);
1411 setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Legal);
1412 setOperationAction(ISD::FP_TO_SINT, MVT::v4i64, Legal);
1413 setOperationAction(ISD::FP_TO_SINT, MVT::v2i64, Legal);
1414 setOperationAction(ISD::FP_TO_UINT, MVT::v4i64, Legal);
1415 setOperationAction(ISD::FP_TO_UINT, MVT::v2i64, Legal);
1418 if (Subtarget->hasVLX()) {
1419 setOperationAction(ISD::SINT_TO_FP, MVT::v8i32, Legal);
1420 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Legal);
1421 setOperationAction(ISD::FP_TO_SINT, MVT::v8i32, Legal);
1422 setOperationAction(ISD::FP_TO_UINT, MVT::v8i32, Legal);
1423 setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
1424 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
1425 setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
1426 setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
1428 setOperationAction(ISD::TRUNCATE, MVT::v8i1, Custom);
1429 setOperationAction(ISD::TRUNCATE, MVT::v16i1, Custom);
1430 setOperationAction(ISD::TRUNCATE, MVT::v16i16, Custom);
1431 setOperationAction(ISD::ZERO_EXTEND, MVT::v16i32, Custom);
1432 setOperationAction(ISD::ZERO_EXTEND, MVT::v8i64, Custom);
1433 setOperationAction(ISD::ANY_EXTEND, MVT::v16i32, Custom);
1434 setOperationAction(ISD::ANY_EXTEND, MVT::v8i64, Custom);
1435 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i32, Custom);
1436 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i64, Custom);
1437 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i8, Custom);
1438 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i16, Custom);
1439 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i16, Custom);
1440 if (Subtarget->hasDQI()) {
1441 setOperationAction(ISD::SIGN_EXTEND, MVT::v4i32, Custom);
1442 setOperationAction(ISD::SIGN_EXTEND, MVT::v2i64, Custom);
1444 setOperationAction(ISD::FFLOOR, MVT::v16f32, Legal);
1445 setOperationAction(ISD::FFLOOR, MVT::v8f64, Legal);
1446 setOperationAction(ISD::FCEIL, MVT::v16f32, Legal);
1447 setOperationAction(ISD::FCEIL, MVT::v8f64, Legal);
1448 setOperationAction(ISD::FTRUNC, MVT::v16f32, Legal);
1449 setOperationAction(ISD::FTRUNC, MVT::v8f64, Legal);
1450 setOperationAction(ISD::FRINT, MVT::v16f32, Legal);
1451 setOperationAction(ISD::FRINT, MVT::v8f64, Legal);
1452 setOperationAction(ISD::FNEARBYINT, MVT::v16f32, Legal);
1453 setOperationAction(ISD::FNEARBYINT, MVT::v8f64, Legal);
1455 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8f64, Custom);
1456 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i64, Custom);
1457 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16f32, Custom);
1458 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i32, Custom);
1459 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i1, Legal);
1461 setOperationAction(ISD::SETCC, MVT::v16i1, Custom);
1462 setOperationAction(ISD::SETCC, MVT::v8i1, Custom);
1464 setOperationAction(ISD::MUL, MVT::v8i64, Custom);
1466 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i1, Custom);
1467 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i1, Custom);
1468 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i1, Custom);
1469 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i1, Custom);
1470 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i1, Custom);
1471 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i1, Custom);
1472 setOperationAction(ISD::SELECT, MVT::v8f64, Custom);
1473 setOperationAction(ISD::SELECT, MVT::v8i64, Custom);
1474 setOperationAction(ISD::SELECT, MVT::v16f32, Custom);
1475 setOperationAction(ISD::SELECT, MVT::v16i1, Custom);
1476 setOperationAction(ISD::SELECT, MVT::v8i1, Custom);
1478 setOperationAction(ISD::SMAX, MVT::v16i32, Legal);
1479 setOperationAction(ISD::SMAX, MVT::v8i64, Legal);
1480 setOperationAction(ISD::UMAX, MVT::v16i32, Legal);
1481 setOperationAction(ISD::UMAX, MVT::v8i64, Legal);
1482 setOperationAction(ISD::SMIN, MVT::v16i32, Legal);
1483 setOperationAction(ISD::SMIN, MVT::v8i64, Legal);
1484 setOperationAction(ISD::UMIN, MVT::v16i32, Legal);
1485 setOperationAction(ISD::UMIN, MVT::v8i64, Legal);
1487 setOperationAction(ISD::ADD, MVT::v8i64, Legal);
1488 setOperationAction(ISD::ADD, MVT::v16i32, Legal);
1490 setOperationAction(ISD::SUB, MVT::v8i64, Legal);
1491 setOperationAction(ISD::SUB, MVT::v16i32, Legal);
1493 setOperationAction(ISD::MUL, MVT::v16i32, Legal);
1495 setOperationAction(ISD::SRL, MVT::v8i64, Custom);
1496 setOperationAction(ISD::SRL, MVT::v16i32, Custom);
1498 setOperationAction(ISD::SHL, MVT::v8i64, Custom);
1499 setOperationAction(ISD::SHL, MVT::v16i32, Custom);
1501 setOperationAction(ISD::SRA, MVT::v8i64, Custom);
1502 setOperationAction(ISD::SRA, MVT::v16i32, Custom);
1504 setOperationAction(ISD::AND, MVT::v8i64, Legal);
1505 setOperationAction(ISD::OR, MVT::v8i64, Legal);
1506 setOperationAction(ISD::XOR, MVT::v8i64, Legal);
1507 setOperationAction(ISD::AND, MVT::v16i32, Legal);
1508 setOperationAction(ISD::OR, MVT::v16i32, Legal);
1509 setOperationAction(ISD::XOR, MVT::v16i32, Legal);
1511 if (Subtarget->hasCDI()) {
1512 setOperationAction(ISD::CTLZ, MVT::v8i64, Legal);
1513 setOperationAction(ISD::CTLZ, MVT::v16i32, Legal);
1514 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i64, Legal);
1515 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v16i32, Legal);
1517 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i64, Custom);
1518 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i32, Custom);
1520 if (Subtarget->hasVLX() && Subtarget->hasCDI()) {
1521 setOperationAction(ISD::CTLZ, MVT::v4i64, Legal);
1522 setOperationAction(ISD::CTLZ, MVT::v8i32, Legal);
1523 setOperationAction(ISD::CTLZ, MVT::v2i64, Legal);
1524 setOperationAction(ISD::CTLZ, MVT::v4i32, Legal);
1525 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i64, Legal);
1526 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i32, Legal);
1527 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v2i64, Legal);
1528 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i32, Legal);
1530 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i64, Custom);
1531 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i32, Custom);
1532 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v2i64, Custom);
1533 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i32, Custom);
1535 if (Subtarget->hasDQI()) {
1536 setOperationAction(ISD::MUL, MVT::v2i64, Legal);
1537 setOperationAction(ISD::MUL, MVT::v4i64, Legal);
1538 setOperationAction(ISD::MUL, MVT::v8i64, Legal);
1540 // Custom lower several nodes.
1541 for (MVT VT : MVT::vector_valuetypes()) {
1542 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
1544 setOperationAction(ISD::AND, VT, Legal);
1545 setOperationAction(ISD::OR, VT, Legal);
1546 setOperationAction(ISD::XOR, VT, Legal);
1548 if (EltSize >= 32 && VT.getSizeInBits() <= 512) {
1549 setOperationAction(ISD::MGATHER, VT, Custom);
1550 setOperationAction(ISD::MSCATTER, VT, Custom);
1552 // Extract subvector is special because the value type
1553 // (result) is 256/128-bit but the source is 512-bit wide.
1554 if (VT.is128BitVector() || VT.is256BitVector()) {
1555 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Custom);
1557 if (VT.getVectorElementType() == MVT::i1)
1558 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Legal);
1560 // Do not attempt to custom lower other non-512-bit vectors
1561 if (!VT.is512BitVector())
1564 if (EltSize >= 32) {
1565 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
1566 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Custom);
1567 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1568 setOperationAction(ISD::VSELECT, VT, Legal);
1569 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
1570 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Custom);
1571 setOperationAction(ISD::INSERT_SUBVECTOR, VT, Custom);
1572 setOperationAction(ISD::MLOAD, VT, Legal);
1573 setOperationAction(ISD::MSTORE, VT, Legal);
1576 for (int i = MVT::v32i8; i != MVT::v8i64; ++i) {
1577 MVT VT = (MVT::SimpleValueType)i;
1579 // Do not attempt to promote non-512-bit vectors.
1580 if (!VT.is512BitVector())
1583 setOperationAction(ISD::SELECT, VT, Promote);
1584 AddPromotedToType (ISD::SELECT, VT, MVT::v8i64);
1588 if (!Subtarget->useSoftFloat() && Subtarget->hasBWI()) {
1589 addRegisterClass(MVT::v32i16, &X86::VR512RegClass);
1590 addRegisterClass(MVT::v64i8, &X86::VR512RegClass);
1592 addRegisterClass(MVT::v32i1, &X86::VK32RegClass);
1593 addRegisterClass(MVT::v64i1, &X86::VK64RegClass);
1595 setOperationAction(ISD::LOAD, MVT::v32i16, Legal);
1596 setOperationAction(ISD::LOAD, MVT::v64i8, Legal);
1597 setOperationAction(ISD::SETCC, MVT::v32i1, Custom);
1598 setOperationAction(ISD::SETCC, MVT::v64i1, Custom);
1599 setOperationAction(ISD::ADD, MVT::v32i16, Legal);
1600 setOperationAction(ISD::ADD, MVT::v64i8, Legal);
1601 setOperationAction(ISD::SUB, MVT::v32i16, Legal);
1602 setOperationAction(ISD::SUB, MVT::v64i8, Legal);
1603 setOperationAction(ISD::MUL, MVT::v32i16, Legal);
1604 setOperationAction(ISD::MULHS, MVT::v32i16, Legal);
1605 setOperationAction(ISD::MULHU, MVT::v32i16, Legal);
1606 setOperationAction(ISD::CONCAT_VECTORS, MVT::v32i1, Legal);
1607 setOperationAction(ISD::CONCAT_VECTORS, MVT::v64i1, Legal);
1608 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v32i1, Custom);
1609 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v64i1, Custom);
1610 setOperationAction(ISD::SELECT, MVT::v32i1, Custom);
1611 setOperationAction(ISD::SELECT, MVT::v64i1, Custom);
1612 setOperationAction(ISD::SIGN_EXTEND, MVT::v32i8, Custom);
1613 setOperationAction(ISD::ZERO_EXTEND, MVT::v32i8, Custom);
1614 setOperationAction(ISD::SIGN_EXTEND, MVT::v32i16, Custom);
1615 setOperationAction(ISD::ZERO_EXTEND, MVT::v32i16, Custom);
1616 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v32i16, Custom);
1617 setOperationAction(ISD::SIGN_EXTEND, MVT::v64i8, Custom);
1618 setOperationAction(ISD::ZERO_EXTEND, MVT::v64i8, Custom);
1619 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v32i1, Custom);
1620 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v64i1, Custom);
1621 setOperationAction(ISD::VSELECT, MVT::v32i16, Legal);
1622 setOperationAction(ISD::VSELECT, MVT::v64i8, Legal);
1623 setOperationAction(ISD::TRUNCATE, MVT::v32i1, Custom);
1624 setOperationAction(ISD::TRUNCATE, MVT::v64i1, Custom);
1625 setOperationAction(ISD::TRUNCATE, MVT::v32i8, Custom);
1626 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v32i1, Custom);
1627 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v64i1, Custom);
1629 setOperationAction(ISD::SMAX, MVT::v64i8, Legal);
1630 setOperationAction(ISD::SMAX, MVT::v32i16, Legal);
1631 setOperationAction(ISD::UMAX, MVT::v64i8, Legal);
1632 setOperationAction(ISD::UMAX, MVT::v32i16, Legal);
1633 setOperationAction(ISD::SMIN, MVT::v64i8, Legal);
1634 setOperationAction(ISD::SMIN, MVT::v32i16, Legal);
1635 setOperationAction(ISD::UMIN, MVT::v64i8, Legal);
1636 setOperationAction(ISD::UMIN, MVT::v32i16, Legal);
1638 setTruncStoreAction(MVT::v32i16, MVT::v32i8, Legal);
1639 setTruncStoreAction(MVT::v16i16, MVT::v16i8, Legal);
1640 if (Subtarget->hasVLX())
1641 setTruncStoreAction(MVT::v8i16, MVT::v8i8, Legal);
1643 for (int i = MVT::v32i8; i != MVT::v8i64; ++i) {
1644 const MVT VT = (MVT::SimpleValueType)i;
1646 const unsigned EltSize = VT.getVectorElementType().getSizeInBits();
1648 // Do not attempt to promote non-512-bit vectors.
1649 if (!VT.is512BitVector())
1653 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1654 setOperationAction(ISD::VSELECT, VT, Legal);
1659 if (!Subtarget->useSoftFloat() && Subtarget->hasVLX()) {
1660 addRegisterClass(MVT::v4i1, &X86::VK4RegClass);
1661 addRegisterClass(MVT::v2i1, &X86::VK2RegClass);
1663 setOperationAction(ISD::SETCC, MVT::v4i1, Custom);
1664 setOperationAction(ISD::SETCC, MVT::v2i1, Custom);
1665 setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i1, Custom);
1666 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i1, Custom);
1667 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v8i1, Custom);
1668 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v4i1, Custom);
1669 setOperationAction(ISD::SELECT, MVT::v4i1, Custom);
1670 setOperationAction(ISD::SELECT, MVT::v2i1, Custom);
1671 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i1, Custom);
1672 setOperationAction(ISD::BUILD_VECTOR, MVT::v2i1, Custom);
1673 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i1, Custom);
1674 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4i1, Custom);
1676 setOperationAction(ISD::AND, MVT::v8i32, Legal);
1677 setOperationAction(ISD::OR, MVT::v8i32, Legal);
1678 setOperationAction(ISD::XOR, MVT::v8i32, Legal);
1679 setOperationAction(ISD::AND, MVT::v4i32, Legal);
1680 setOperationAction(ISD::OR, MVT::v4i32, Legal);
1681 setOperationAction(ISD::XOR, MVT::v4i32, Legal);
1682 setOperationAction(ISD::SRA, MVT::v2i64, Custom);
1683 setOperationAction(ISD::SRA, MVT::v4i64, Custom);
1685 setOperationAction(ISD::SMAX, MVT::v2i64, Legal);
1686 setOperationAction(ISD::SMAX, MVT::v4i64, Legal);
1687 setOperationAction(ISD::UMAX, MVT::v2i64, Legal);
1688 setOperationAction(ISD::UMAX, MVT::v4i64, Legal);
1689 setOperationAction(ISD::SMIN, MVT::v2i64, Legal);
1690 setOperationAction(ISD::SMIN, MVT::v4i64, Legal);
1691 setOperationAction(ISD::UMIN, MVT::v2i64, Legal);
1692 setOperationAction(ISD::UMIN, MVT::v4i64, Legal);
1695 // We want to custom lower some of our intrinsics.
1696 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
1697 setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::Other, Custom);
1698 setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
1699 if (!Subtarget->is64Bit())
1700 setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i64, Custom);
1702 // Only custom-lower 64-bit SADDO and friends on 64-bit because we don't
1703 // handle type legalization for these operations here.
1705 // FIXME: We really should do custom legalization for addition and
1706 // subtraction on x86-32 once PR3203 is fixed. We really can't do much better
1707 // than generic legalization for 64-bit multiplication-with-overflow, though.
1708 for (unsigned i = 0, e = 3+Subtarget->is64Bit(); i != e; ++i) {
1709 // Add/Sub/Mul with overflow operations are custom lowered.
1711 setOperationAction(ISD::SADDO, VT, Custom);
1712 setOperationAction(ISD::UADDO, VT, Custom);
1713 setOperationAction(ISD::SSUBO, VT, Custom);
1714 setOperationAction(ISD::USUBO, VT, Custom);
1715 setOperationAction(ISD::SMULO, VT, Custom);
1716 setOperationAction(ISD::UMULO, VT, Custom);
1719 if (!Subtarget->is64Bit()) {
1720 // These libcalls are not available in 32-bit.
1721 setLibcallName(RTLIB::SHL_I128, nullptr);
1722 setLibcallName(RTLIB::SRL_I128, nullptr);
1723 setLibcallName(RTLIB::SRA_I128, nullptr);
1726 // Combine sin / cos into one node or libcall if possible.
1727 if (Subtarget->hasSinCos()) {
1728 setLibcallName(RTLIB::SINCOS_F32, "sincosf");
1729 setLibcallName(RTLIB::SINCOS_F64, "sincos");
1730 if (Subtarget->isTargetDarwin()) {
1731 // For MacOSX, we don't want the normal expansion of a libcall to sincos.
1732 // We want to issue a libcall to __sincos_stret to avoid memory traffic.
1733 setOperationAction(ISD::FSINCOS, MVT::f64, Custom);
1734 setOperationAction(ISD::FSINCOS, MVT::f32, Custom);
1738 if (Subtarget->isTargetWin64()) {
1739 setOperationAction(ISD::SDIV, MVT::i128, Custom);
1740 setOperationAction(ISD::UDIV, MVT::i128, Custom);
1741 setOperationAction(ISD::SREM, MVT::i128, Custom);
1742 setOperationAction(ISD::UREM, MVT::i128, Custom);
1743 setOperationAction(ISD::SDIVREM, MVT::i128, Custom);
1744 setOperationAction(ISD::UDIVREM, MVT::i128, Custom);
1747 // We have target-specific dag combine patterns for the following nodes:
1748 setTargetDAGCombine(ISD::VECTOR_SHUFFLE);
1749 setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
1750 setTargetDAGCombine(ISD::BITCAST);
1751 setTargetDAGCombine(ISD::VSELECT);
1752 setTargetDAGCombine(ISD::SELECT);
1753 setTargetDAGCombine(ISD::SHL);
1754 setTargetDAGCombine(ISD::SRA);
1755 setTargetDAGCombine(ISD::SRL);
1756 setTargetDAGCombine(ISD::OR);
1757 setTargetDAGCombine(ISD::AND);
1758 setTargetDAGCombine(ISD::ADD);
1759 setTargetDAGCombine(ISD::FADD);
1760 setTargetDAGCombine(ISD::FSUB);
1761 setTargetDAGCombine(ISD::FMA);
1762 setTargetDAGCombine(ISD::SUB);
1763 setTargetDAGCombine(ISD::LOAD);
1764 setTargetDAGCombine(ISD::MLOAD);
1765 setTargetDAGCombine(ISD::STORE);
1766 setTargetDAGCombine(ISD::MSTORE);
1767 setTargetDAGCombine(ISD::ZERO_EXTEND);
1768 setTargetDAGCombine(ISD::ANY_EXTEND);
1769 setTargetDAGCombine(ISD::SIGN_EXTEND);
1770 setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
1771 setTargetDAGCombine(ISD::SINT_TO_FP);
1772 setTargetDAGCombine(ISD::UINT_TO_FP);
1773 setTargetDAGCombine(ISD::SETCC);
1774 setTargetDAGCombine(ISD::BUILD_VECTOR);
1775 setTargetDAGCombine(ISD::MUL);
1776 setTargetDAGCombine(ISD::XOR);
1778 computeRegisterProperties(Subtarget->getRegisterInfo());
1780 MaxStoresPerMemset = 16; // For @llvm.memset -> sequence of stores
1781 MaxStoresPerMemsetOptSize = 8;
1782 MaxStoresPerMemcpy = 8; // For @llvm.memcpy -> sequence of stores
1783 MaxStoresPerMemcpyOptSize = 4;
1784 MaxStoresPerMemmove = 8; // For @llvm.memmove -> sequence of stores
1785 MaxStoresPerMemmoveOptSize = 4;
1786 setPrefLoopAlignment(4); // 2^4 bytes.
1788 // A predictable cmov does not hurt on an in-order CPU.
1789 // FIXME: Use a CPU attribute to trigger this, not a CPU model.
1790 PredictableSelectIsExpensive = !Subtarget->isAtom();
1791 EnableExtLdPromotion = true;
1792 setPrefFunctionAlignment(4); // 2^4 bytes.
1794 verifyIntrinsicTables();
1797 // This has so far only been implemented for 64-bit MachO.
1798 bool X86TargetLowering::useLoadStackGuardNode() const {
1799 return Subtarget->isTargetMachO() && Subtarget->is64Bit();
1802 TargetLoweringBase::LegalizeTypeAction
1803 X86TargetLowering::getPreferredVectorAction(EVT VT) const {
1804 if (ExperimentalVectorWideningLegalization &&
1805 VT.getVectorNumElements() != 1 &&
1806 VT.getVectorElementType().getSimpleVT() != MVT::i1)
1807 return TypeWidenVector;
1809 return TargetLoweringBase::getPreferredVectorAction(VT);
1812 EVT X86TargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &,
1815 return Subtarget->hasAVX512() ? MVT::i1: MVT::i8;
1817 const unsigned NumElts = VT.getVectorNumElements();
1818 const EVT EltVT = VT.getVectorElementType();
1819 if (VT.is512BitVector()) {
1820 if (Subtarget->hasAVX512())
1821 if (EltVT == MVT::i32 || EltVT == MVT::i64 ||
1822 EltVT == MVT::f32 || EltVT == MVT::f64)
1824 case 8: return MVT::v8i1;
1825 case 16: return MVT::v16i1;
1827 if (Subtarget->hasBWI())
1828 if (EltVT == MVT::i8 || EltVT == MVT::i16)
1830 case 32: return MVT::v32i1;
1831 case 64: return MVT::v64i1;
1835 if (VT.is256BitVector() || VT.is128BitVector()) {
1836 if (Subtarget->hasVLX())
1837 if (EltVT == MVT::i32 || EltVT == MVT::i64 ||
1838 EltVT == MVT::f32 || EltVT == MVT::f64)
1840 case 2: return MVT::v2i1;
1841 case 4: return MVT::v4i1;
1842 case 8: return MVT::v8i1;
1844 if (Subtarget->hasBWI() && Subtarget->hasVLX())
1845 if (EltVT == MVT::i8 || EltVT == MVT::i16)
1847 case 8: return MVT::v8i1;
1848 case 16: return MVT::v16i1;
1849 case 32: return MVT::v32i1;
1853 return VT.changeVectorElementTypeToInteger();
1856 /// Helper for getByValTypeAlignment to determine
1857 /// the desired ByVal argument alignment.
1858 static void getMaxByValAlign(Type *Ty, unsigned &MaxAlign) {
1861 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
1862 if (VTy->getBitWidth() == 128)
1864 } else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
1865 unsigned EltAlign = 0;
1866 getMaxByValAlign(ATy->getElementType(), EltAlign);
1867 if (EltAlign > MaxAlign)
1868 MaxAlign = EltAlign;
1869 } else if (StructType *STy = dyn_cast<StructType>(Ty)) {
1870 for (auto *EltTy : STy->elements()) {
1871 unsigned EltAlign = 0;
1872 getMaxByValAlign(EltTy, EltAlign);
1873 if (EltAlign > MaxAlign)
1874 MaxAlign = EltAlign;
1881 /// Return the desired alignment for ByVal aggregate
1882 /// function arguments in the caller parameter area. For X86, aggregates
1883 /// that contain SSE vectors are placed at 16-byte boundaries while the rest
1884 /// are at 4-byte boundaries.
1885 unsigned X86TargetLowering::getByValTypeAlignment(Type *Ty,
1886 const DataLayout &DL) const {
1887 if (Subtarget->is64Bit()) {
1888 // Max of 8 and alignment of type.
1889 unsigned TyAlign = DL.getABITypeAlignment(Ty);
1896 if (Subtarget->hasSSE1())
1897 getMaxByValAlign(Ty, Align);
1901 /// Returns the target specific optimal type for load
1902 /// and store operations as a result of memset, memcpy, and memmove
1903 /// lowering. If DstAlign is zero that means it's safe to destination
1904 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
1905 /// means there isn't a need to check it against alignment requirement,
1906 /// probably because the source does not need to be loaded. If 'IsMemset' is
1907 /// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
1908 /// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
1909 /// source is constant so it does not need to be loaded.
1910 /// It returns EVT::Other if the type should be determined using generic
1911 /// target-independent logic.
1913 X86TargetLowering::getOptimalMemOpType(uint64_t Size,
1914 unsigned DstAlign, unsigned SrcAlign,
1915 bool IsMemset, bool ZeroMemset,
1917 MachineFunction &MF) const {
1918 const Function *F = MF.getFunction();
1919 if ((!IsMemset || ZeroMemset) &&
1920 !F->hasFnAttribute(Attribute::NoImplicitFloat)) {
1922 (!Subtarget->isUnalignedMem16Slow() ||
1923 ((DstAlign == 0 || DstAlign >= 16) &&
1924 (SrcAlign == 0 || SrcAlign >= 16)))) {
1926 // FIXME: Check if unaligned 32-byte accesses are slow.
1927 if (Subtarget->hasInt256())
1929 if (Subtarget->hasFp256())
1932 if (Subtarget->hasSSE2())
1934 if (Subtarget->hasSSE1())
1936 } else if (!MemcpyStrSrc && Size >= 8 &&
1937 !Subtarget->is64Bit() &&
1938 Subtarget->hasSSE2()) {
1939 // Do not use f64 to lower memcpy if source is string constant. It's
1940 // better to use i32 to avoid the loads.
1944 // This is a compromise. If we reach here, unaligned accesses may be slow on
1945 // this target. However, creating smaller, aligned accesses could be even
1946 // slower and would certainly be a lot more code.
1947 if (Subtarget->is64Bit() && Size >= 8)
1952 bool X86TargetLowering::isSafeMemOpType(MVT VT) const {
1954 return X86ScalarSSEf32;
1955 else if (VT == MVT::f64)
1956 return X86ScalarSSEf64;
1961 X86TargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
1966 switch (VT.getSizeInBits()) {
1968 // 8-byte and under are always assumed to be fast.
1972 *Fast = !Subtarget->isUnalignedMem16Slow();
1975 *Fast = !Subtarget->isUnalignedMem32Slow();
1977 // TODO: What about AVX-512 (512-bit) accesses?
1980 // Misaligned accesses of any size are always allowed.
1984 /// Return the entry encoding for a jump table in the
1985 /// current function. The returned value is a member of the
1986 /// MachineJumpTableInfo::JTEntryKind enum.
1987 unsigned X86TargetLowering::getJumpTableEncoding() const {
1988 // In GOT pic mode, each entry in the jump table is emitted as a @GOTOFF
1990 if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
1991 Subtarget->isPICStyleGOT())
1992 return MachineJumpTableInfo::EK_Custom32;
1994 // Otherwise, use the normal jump table encoding heuristics.
1995 return TargetLowering::getJumpTableEncoding();
1998 bool X86TargetLowering::useSoftFloat() const {
1999 return Subtarget->useSoftFloat();
2003 X86TargetLowering::LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
2004 const MachineBasicBlock *MBB,
2005 unsigned uid,MCContext &Ctx) const{
2006 assert(MBB->getParent()->getTarget().getRelocationModel() == Reloc::PIC_ &&
2007 Subtarget->isPICStyleGOT());
2008 // In 32-bit ELF systems, our jump table entries are formed with @GOTOFF
2010 return MCSymbolRefExpr::create(MBB->getSymbol(),
2011 MCSymbolRefExpr::VK_GOTOFF, Ctx);
2014 /// Returns relocation base for the given PIC jumptable.
2015 SDValue X86TargetLowering::getPICJumpTableRelocBase(SDValue Table,
2016 SelectionDAG &DAG) const {
2017 if (!Subtarget->is64Bit())
2018 // This doesn't have SDLoc associated with it, but is not really the
2019 // same as a Register.
2020 return DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(),
2021 getPointerTy(DAG.getDataLayout()));
2025 /// This returns the relocation base for the given PIC jumptable,
2026 /// the same as getPICJumpTableRelocBase, but as an MCExpr.
2027 const MCExpr *X86TargetLowering::
2028 getPICJumpTableRelocBaseExpr(const MachineFunction *MF, unsigned JTI,
2029 MCContext &Ctx) const {
2030 // X86-64 uses RIP relative addressing based on the jump table label.
2031 if (Subtarget->isPICStyleRIPRel())
2032 return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
2034 // Otherwise, the reference is relative to the PIC base.
2035 return MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
2038 std::pair<const TargetRegisterClass *, uint8_t>
2039 X86TargetLowering::findRepresentativeClass(const TargetRegisterInfo *TRI,
2041 const TargetRegisterClass *RRC = nullptr;
2043 switch (VT.SimpleTy) {
2045 return TargetLowering::findRepresentativeClass(TRI, VT);
2046 case MVT::i8: case MVT::i16: case MVT::i32: case MVT::i64:
2047 RRC = Subtarget->is64Bit() ? &X86::GR64RegClass : &X86::GR32RegClass;
2050 RRC = &X86::VR64RegClass;
2052 case MVT::f32: case MVT::f64:
2053 case MVT::v16i8: case MVT::v8i16: case MVT::v4i32: case MVT::v2i64:
2054 case MVT::v4f32: case MVT::v2f64:
2055 case MVT::v32i8: case MVT::v8i32: case MVT::v4i64: case MVT::v8f32:
2057 RRC = &X86::VR128RegClass;
2060 return std::make_pair(RRC, Cost);
2063 bool X86TargetLowering::getStackCookieLocation(unsigned &AddressSpace,
2064 unsigned &Offset) const {
2065 if (!Subtarget->isTargetLinux())
2068 if (Subtarget->is64Bit()) {
2069 // %fs:0x28, unless we're using a Kernel code model, in which case it's %gs:
2071 if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
2083 /// Android provides a fixed TLS slot for the SafeStack pointer.
2084 /// See the definition of TLS_SLOT_SAFESTACK in
2085 /// https://android.googlesource.com/platform/bionic/+/master/libc/private/bionic_tls.h
2086 bool X86TargetLowering::getSafeStackPointerLocation(unsigned &AddressSpace,
2087 unsigned &Offset) const {
2088 if (!Subtarget->isTargetAndroid())
2091 if (Subtarget->is64Bit()) {
2092 // %fs:0x48, unless we're using a Kernel code model, in which case it's %gs:
2094 if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
2106 bool X86TargetLowering::isNoopAddrSpaceCast(unsigned SrcAS,
2107 unsigned DestAS) const {
2108 assert(SrcAS != DestAS && "Expected different address spaces!");
2110 return SrcAS < 256 && DestAS < 256;
2113 //===----------------------------------------------------------------------===//
2114 // Return Value Calling Convention Implementation
2115 //===----------------------------------------------------------------------===//
2117 #include "X86GenCallingConv.inc"
2119 bool X86TargetLowering::CanLowerReturn(
2120 CallingConv::ID CallConv, MachineFunction &MF, bool isVarArg,
2121 const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context) const {
2122 SmallVector<CCValAssign, 16> RVLocs;
2123 CCState CCInfo(CallConv, isVarArg, MF, RVLocs, Context);
2124 return CCInfo.CheckReturn(Outs, RetCC_X86);
2127 const MCPhysReg *X86TargetLowering::getScratchRegisters(CallingConv::ID) const {
2128 static const MCPhysReg ScratchRegs[] = { X86::R11, 0 };
2133 X86TargetLowering::LowerReturn(SDValue Chain,
2134 CallingConv::ID CallConv, bool isVarArg,
2135 const SmallVectorImpl<ISD::OutputArg> &Outs,
2136 const SmallVectorImpl<SDValue> &OutVals,
2137 SDLoc dl, SelectionDAG &DAG) const {
2138 MachineFunction &MF = DAG.getMachineFunction();
2139 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
2141 SmallVector<CCValAssign, 16> RVLocs;
2142 CCState CCInfo(CallConv, isVarArg, MF, RVLocs, *DAG.getContext());
2143 CCInfo.AnalyzeReturn(Outs, RetCC_X86);
2146 SmallVector<SDValue, 6> RetOps;
2147 RetOps.push_back(Chain); // Operand #0 = Chain (updated below)
2148 // Operand #1 = Bytes To Pop
2149 RetOps.push_back(DAG.getTargetConstant(FuncInfo->getBytesToPopOnReturn(), dl,
2152 // Copy the result values into the output registers.
2153 for (unsigned i = 0; i != RVLocs.size(); ++i) {
2154 CCValAssign &VA = RVLocs[i];
2155 assert(VA.isRegLoc() && "Can only return in registers!");
2156 SDValue ValToCopy = OutVals[i];
2157 EVT ValVT = ValToCopy.getValueType();
2159 // Promote values to the appropriate types.
2160 if (VA.getLocInfo() == CCValAssign::SExt)
2161 ValToCopy = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ValToCopy);
2162 else if (VA.getLocInfo() == CCValAssign::ZExt)
2163 ValToCopy = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ValToCopy);
2164 else if (VA.getLocInfo() == CCValAssign::AExt) {
2165 if (ValVT.isVector() && ValVT.getScalarType() == MVT::i1)
2166 ValToCopy = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ValToCopy);
2168 ValToCopy = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ValToCopy);
2170 else if (VA.getLocInfo() == CCValAssign::BCvt)
2171 ValToCopy = DAG.getBitcast(VA.getLocVT(), ValToCopy);
2173 assert(VA.getLocInfo() != CCValAssign::FPExt &&
2174 "Unexpected FP-extend for return value.");
2176 // If this is x86-64, and we disabled SSE, we can't return FP values,
2177 // or SSE or MMX vectors.
2178 if ((ValVT == MVT::f32 || ValVT == MVT::f64 ||
2179 VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) &&
2180 (Subtarget->is64Bit() && !Subtarget->hasSSE1())) {
2181 report_fatal_error("SSE register return with SSE disabled");
2183 // Likewise we can't return F64 values with SSE1 only. gcc does so, but
2184 // llvm-gcc has never done it right and no one has noticed, so this
2185 // should be OK for now.
2186 if (ValVT == MVT::f64 &&
2187 (Subtarget->is64Bit() && !Subtarget->hasSSE2()))
2188 report_fatal_error("SSE2 register return with SSE2 disabled");
2190 // Returns in ST0/ST1 are handled specially: these are pushed as operands to
2191 // the RET instruction and handled by the FP Stackifier.
2192 if (VA.getLocReg() == X86::FP0 ||
2193 VA.getLocReg() == X86::FP1) {
2194 // If this is a copy from an xmm register to ST(0), use an FPExtend to
2195 // change the value to the FP stack register class.
2196 if (isScalarFPTypeInSSEReg(VA.getValVT()))
2197 ValToCopy = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f80, ValToCopy);
2198 RetOps.push_back(ValToCopy);
2199 // Don't emit a copytoreg.
2203 // 64-bit vector (MMX) values are returned in XMM0 / XMM1 except for v1i64
2204 // which is returned in RAX / RDX.
2205 if (Subtarget->is64Bit()) {
2206 if (ValVT == MVT::x86mmx) {
2207 if (VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) {
2208 ValToCopy = DAG.getBitcast(MVT::i64, ValToCopy);
2209 ValToCopy = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
2211 // If we don't have SSE2 available, convert to v4f32 so the generated
2212 // register is legal.
2213 if (!Subtarget->hasSSE2())
2214 ValToCopy = DAG.getBitcast(MVT::v4f32, ValToCopy);
2219 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ValToCopy, Flag);
2220 Flag = Chain.getValue(1);
2221 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
2224 // All x86 ABIs require that for returning structs by value we copy
2225 // the sret argument into %rax/%eax (depending on ABI) for the return.
2226 // We saved the argument into a virtual register in the entry block,
2227 // so now we copy the value out and into %rax/%eax.
2229 // Checking Function.hasStructRetAttr() here is insufficient because the IR
2230 // may not have an explicit sret argument. If FuncInfo.CanLowerReturn is
2231 // false, then an sret argument may be implicitly inserted in the SelDAG. In
2232 // either case FuncInfo->setSRetReturnReg() will have been called.
2233 if (unsigned SRetReg = FuncInfo->getSRetReturnReg()) {
2234 SDValue Val = DAG.getCopyFromReg(Chain, dl, SRetReg,
2235 getPointerTy(MF.getDataLayout()));
2238 = (Subtarget->is64Bit() && !Subtarget->isTarget64BitILP32()) ?
2239 X86::RAX : X86::EAX;
2240 Chain = DAG.getCopyToReg(Chain, dl, RetValReg, Val, Flag);
2241 Flag = Chain.getValue(1);
2243 // RAX/EAX now acts like a return value.
2245 DAG.getRegister(RetValReg, getPointerTy(DAG.getDataLayout())));
2248 RetOps[0] = Chain; // Update chain.
2250 // Add the flag if we have it.
2252 RetOps.push_back(Flag);
2254 return DAG.getNode(X86ISD::RET_FLAG, dl, MVT::Other, RetOps);
2257 bool X86TargetLowering::isUsedByReturnOnly(SDNode *N, SDValue &Chain) const {
2258 if (N->getNumValues() != 1)
2260 if (!N->hasNUsesOfValue(1, 0))
2263 SDValue TCChain = Chain;
2264 SDNode *Copy = *N->use_begin();
2265 if (Copy->getOpcode() == ISD::CopyToReg) {
2266 // If the copy has a glue operand, we conservatively assume it isn't safe to
2267 // perform a tail call.
2268 if (Copy->getOperand(Copy->getNumOperands()-1).getValueType() == MVT::Glue)
2270 TCChain = Copy->getOperand(0);
2271 } else if (Copy->getOpcode() != ISD::FP_EXTEND)
2274 bool HasRet = false;
2275 for (SDNode::use_iterator UI = Copy->use_begin(), UE = Copy->use_end();
2277 if (UI->getOpcode() != X86ISD::RET_FLAG)
2279 // If we are returning more than one value, we can definitely
2280 // not make a tail call see PR19530
2281 if (UI->getNumOperands() > 4)
2283 if (UI->getNumOperands() == 4 &&
2284 UI->getOperand(UI->getNumOperands()-1).getValueType() != MVT::Glue)
2297 X86TargetLowering::getTypeForExtArgOrReturn(LLVMContext &Context, EVT VT,
2298 ISD::NodeType ExtendKind) const {
2300 // TODO: Is this also valid on 32-bit?
2301 if (Subtarget->is64Bit() && VT == MVT::i1 && ExtendKind == ISD::ZERO_EXTEND)
2302 ReturnMVT = MVT::i8;
2304 ReturnMVT = MVT::i32;
2306 EVT MinVT = getRegisterType(Context, ReturnMVT);
2307 return VT.bitsLT(MinVT) ? MinVT : VT;
2310 /// Lower the result values of a call into the
2311 /// appropriate copies out of appropriate physical registers.
2314 X86TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
2315 CallingConv::ID CallConv, bool isVarArg,
2316 const SmallVectorImpl<ISD::InputArg> &Ins,
2317 SDLoc dl, SelectionDAG &DAG,
2318 SmallVectorImpl<SDValue> &InVals) const {
2320 // Assign locations to each value returned by this call.
2321 SmallVector<CCValAssign, 16> RVLocs;
2322 bool Is64Bit = Subtarget->is64Bit();
2323 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
2325 CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
2327 // Copy all of the result registers out of their specified physreg.
2328 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
2329 CCValAssign &VA = RVLocs[i];
2330 EVT CopyVT = VA.getLocVT();
2332 // If this is x86-64, and we disabled SSE, we can't return FP values
2333 if ((CopyVT == MVT::f32 || CopyVT == MVT::f64) &&
2334 ((Is64Bit || Ins[i].Flags.isInReg()) && !Subtarget->hasSSE1())) {
2335 report_fatal_error("SSE register return with SSE disabled");
2338 // If we prefer to use the value in xmm registers, copy it out as f80 and
2339 // use a truncate to move it from fp stack reg to xmm reg.
2340 bool RoundAfterCopy = false;
2341 if ((VA.getLocReg() == X86::FP0 || VA.getLocReg() == X86::FP1) &&
2342 isScalarFPTypeInSSEReg(VA.getValVT())) {
2344 RoundAfterCopy = (CopyVT != VA.getLocVT());
2347 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
2348 CopyVT, InFlag).getValue(1);
2349 SDValue Val = Chain.getValue(0);
2352 Val = DAG.getNode(ISD::FP_ROUND, dl, VA.getValVT(), Val,
2353 // This truncation won't change the value.
2354 DAG.getIntPtrConstant(1, dl));
2356 if (VA.isExtInLoc() && VA.getValVT().getScalarType() == MVT::i1)
2357 Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
2359 InFlag = Chain.getValue(2);
2360 InVals.push_back(Val);
2366 //===----------------------------------------------------------------------===//
2367 // C & StdCall & Fast Calling Convention implementation
2368 //===----------------------------------------------------------------------===//
2369 // StdCall calling convention seems to be standard for many Windows' API
2370 // routines and around. It differs from C calling convention just a little:
2371 // callee should clean up the stack, not caller. Symbols should be also
2372 // decorated in some fancy way :) It doesn't support any vector arguments.
2373 // For info on fast calling convention see Fast Calling Convention (tail call)
2374 // implementation LowerX86_32FastCCCallTo.
2376 /// CallIsStructReturn - Determines whether a call uses struct return
2378 enum StructReturnType {
2383 static StructReturnType
2384 callIsStructReturn(const SmallVectorImpl<ISD::OutputArg> &Outs) {
2386 return NotStructReturn;
2388 const ISD::ArgFlagsTy &Flags = Outs[0].Flags;
2389 if (!Flags.isSRet())
2390 return NotStructReturn;
2391 if (Flags.isInReg())
2392 return RegStructReturn;
2393 return StackStructReturn;
2396 /// Determines whether a function uses struct return semantics.
2397 static StructReturnType
2398 argsAreStructReturn(const SmallVectorImpl<ISD::InputArg> &Ins) {
2400 return NotStructReturn;
2402 const ISD::ArgFlagsTy &Flags = Ins[0].Flags;
2403 if (!Flags.isSRet())
2404 return NotStructReturn;
2405 if (Flags.isInReg())
2406 return RegStructReturn;
2407 return StackStructReturn;
2410 /// Make a copy of an aggregate at address specified by "Src" to address
2411 /// "Dst" with size and alignment information specified by the specific
2412 /// parameter attribute. The copy will be passed as a byval function parameter.
2414 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
2415 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
2417 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i32);
2419 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
2420 /*isVolatile*/false, /*AlwaysInline=*/true,
2421 /*isTailCall*/false,
2422 MachinePointerInfo(), MachinePointerInfo());
2425 /// Return true if the calling convention is one that
2426 /// supports tail call optimization.
2427 static bool IsTailCallConvention(CallingConv::ID CC) {
2428 return (CC == CallingConv::Fast || CC == CallingConv::GHC ||
2429 CC == CallingConv::HiPE || CC == CallingConv::HHVM);
2432 /// \brief Return true if the calling convention is a C calling convention.
2433 static bool IsCCallConvention(CallingConv::ID CC) {
2434 return (CC == CallingConv::C || CC == CallingConv::X86_64_Win64 ||
2435 CC == CallingConv::X86_64_SysV);
2438 bool X86TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
2440 CI->getParent()->getParent()->getFnAttribute("disable-tail-calls");
2441 if (!CI->isTailCall() || Attr.getValueAsString() == "true")
2445 CallingConv::ID CalleeCC = CS.getCallingConv();
2446 if (!IsTailCallConvention(CalleeCC) && !IsCCallConvention(CalleeCC))
2452 /// Return true if the function is being made into
2453 /// a tailcall target by changing its ABI.
2454 static bool FuncIsMadeTailCallSafe(CallingConv::ID CC,
2455 bool GuaranteedTailCallOpt) {
2456 return GuaranteedTailCallOpt && IsTailCallConvention(CC);
2460 X86TargetLowering::LowerMemArgument(SDValue Chain,
2461 CallingConv::ID CallConv,
2462 const SmallVectorImpl<ISD::InputArg> &Ins,
2463 SDLoc dl, SelectionDAG &DAG,
2464 const CCValAssign &VA,
2465 MachineFrameInfo *MFI,
2467 // Create the nodes corresponding to a load from this parameter slot.
2468 ISD::ArgFlagsTy Flags = Ins[i].Flags;
2469 bool AlwaysUseMutable = FuncIsMadeTailCallSafe(
2470 CallConv, DAG.getTarget().Options.GuaranteedTailCallOpt);
2471 bool isImmutable = !AlwaysUseMutable && !Flags.isByVal();
2474 // If value is passed by pointer we have address passed instead of the value
2476 bool ExtendedInMem = VA.isExtInLoc() &&
2477 VA.getValVT().getScalarType() == MVT::i1;
2479 if (VA.getLocInfo() == CCValAssign::Indirect || ExtendedInMem)
2480 ValVT = VA.getLocVT();
2482 ValVT = VA.getValVT();
2484 // FIXME: For now, all byval parameter objects are marked mutable. This can be
2485 // changed with more analysis.
2486 // In case of tail call optimization mark all arguments mutable. Since they
2487 // could be overwritten by lowering of arguments in case of a tail call.
2488 if (Flags.isByVal()) {
2489 unsigned Bytes = Flags.getByValSize();
2490 if (Bytes == 0) Bytes = 1; // Don't create zero-sized stack objects.
2491 int FI = MFI->CreateFixedObject(Bytes, VA.getLocMemOffset(), isImmutable);
2492 return DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
2494 int FI = MFI->CreateFixedObject(ValVT.getSizeInBits()/8,
2495 VA.getLocMemOffset(), isImmutable);
2496 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
2497 SDValue Val = DAG.getLoad(
2498 ValVT, dl, Chain, FIN,
2499 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI), false,
2501 return ExtendedInMem ?
2502 DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val) : Val;
2506 // FIXME: Get this from tablegen.
2507 static ArrayRef<MCPhysReg> get64BitArgumentGPRs(CallingConv::ID CallConv,
2508 const X86Subtarget *Subtarget) {
2509 assert(Subtarget->is64Bit());
2511 if (Subtarget->isCallingConvWin64(CallConv)) {
2512 static const MCPhysReg GPR64ArgRegsWin64[] = {
2513 X86::RCX, X86::RDX, X86::R8, X86::R9
2515 return makeArrayRef(std::begin(GPR64ArgRegsWin64), std::end(GPR64ArgRegsWin64));
2518 static const MCPhysReg GPR64ArgRegs64Bit[] = {
2519 X86::RDI, X86::RSI, X86::RDX, X86::RCX, X86::R8, X86::R9
2521 return makeArrayRef(std::begin(GPR64ArgRegs64Bit), std::end(GPR64ArgRegs64Bit));
2524 // FIXME: Get this from tablegen.
2525 static ArrayRef<MCPhysReg> get64BitArgumentXMMs(MachineFunction &MF,
2526 CallingConv::ID CallConv,
2527 const X86Subtarget *Subtarget) {
2528 assert(Subtarget->is64Bit());
2529 if (Subtarget->isCallingConvWin64(CallConv)) {
2530 // The XMM registers which might contain var arg parameters are shadowed
2531 // in their paired GPR. So we only need to save the GPR to their home
2533 // TODO: __vectorcall will change this.
2537 const Function *Fn = MF.getFunction();
2538 bool NoImplicitFloatOps = Fn->hasFnAttribute(Attribute::NoImplicitFloat);
2539 bool isSoftFloat = Subtarget->useSoftFloat();
2540 assert(!(isSoftFloat && NoImplicitFloatOps) &&
2541 "SSE register cannot be used when SSE is disabled!");
2542 if (isSoftFloat || NoImplicitFloatOps || !Subtarget->hasSSE1())
2543 // Kernel mode asks for SSE to be disabled, so there are no XMM argument
2547 static const MCPhysReg XMMArgRegs64Bit[] = {
2548 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
2549 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
2551 return makeArrayRef(std::begin(XMMArgRegs64Bit), std::end(XMMArgRegs64Bit));
2554 SDValue X86TargetLowering::LowerFormalArguments(
2555 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
2556 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc dl, SelectionDAG &DAG,
2557 SmallVectorImpl<SDValue> &InVals) const {
2558 MachineFunction &MF = DAG.getMachineFunction();
2559 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
2560 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
2562 const Function* Fn = MF.getFunction();
2563 if (Fn->hasExternalLinkage() &&
2564 Subtarget->isTargetCygMing() &&
2565 Fn->getName() == "main")
2566 FuncInfo->setForceFramePointer(true);
2568 MachineFrameInfo *MFI = MF.getFrameInfo();
2569 bool Is64Bit = Subtarget->is64Bit();
2570 bool IsWin64 = Subtarget->isCallingConvWin64(CallConv);
2572 assert(!(isVarArg && IsTailCallConvention(CallConv)) &&
2573 "Var args not supported with calling convention fastcc, ghc or hipe");
2575 // Assign locations to all of the incoming arguments.
2576 SmallVector<CCValAssign, 16> ArgLocs;
2577 CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
2579 // Allocate shadow area for Win64
2581 CCInfo.AllocateStack(32, 8);
2583 CCInfo.AnalyzeFormalArguments(Ins, CC_X86);
2585 unsigned LastVal = ~0U;
2587 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2588 CCValAssign &VA = ArgLocs[i];
2589 // TODO: If an arg is passed in two places (e.g. reg and stack), skip later
2591 assert(VA.getValNo() != LastVal &&
2592 "Don't support value assigned to multiple locs yet");
2594 LastVal = VA.getValNo();
2596 if (VA.isRegLoc()) {
2597 EVT RegVT = VA.getLocVT();
2598 const TargetRegisterClass *RC;
2599 if (RegVT == MVT::i32)
2600 RC = &X86::GR32RegClass;
2601 else if (Is64Bit && RegVT == MVT::i64)
2602 RC = &X86::GR64RegClass;
2603 else if (RegVT == MVT::f32)
2604 RC = &X86::FR32RegClass;
2605 else if (RegVT == MVT::f64)
2606 RC = &X86::FR64RegClass;
2607 else if (RegVT.is512BitVector())
2608 RC = &X86::VR512RegClass;
2609 else if (RegVT.is256BitVector())
2610 RC = &X86::VR256RegClass;
2611 else if (RegVT.is128BitVector())
2612 RC = &X86::VR128RegClass;
2613 else if (RegVT == MVT::x86mmx)
2614 RC = &X86::VR64RegClass;
2615 else if (RegVT == MVT::i1)
2616 RC = &X86::VK1RegClass;
2617 else if (RegVT == MVT::v8i1)
2618 RC = &X86::VK8RegClass;
2619 else if (RegVT == MVT::v16i1)
2620 RC = &X86::VK16RegClass;
2621 else if (RegVT == MVT::v32i1)
2622 RC = &X86::VK32RegClass;
2623 else if (RegVT == MVT::v64i1)
2624 RC = &X86::VK64RegClass;
2626 llvm_unreachable("Unknown argument type!");
2628 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2629 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
2631 // If this is an 8 or 16-bit value, it is really passed promoted to 32
2632 // bits. Insert an assert[sz]ext to capture this, then truncate to the
2634 if (VA.getLocInfo() == CCValAssign::SExt)
2635 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
2636 DAG.getValueType(VA.getValVT()));
2637 else if (VA.getLocInfo() == CCValAssign::ZExt)
2638 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
2639 DAG.getValueType(VA.getValVT()));
2640 else if (VA.getLocInfo() == CCValAssign::BCvt)
2641 ArgValue = DAG.getBitcast(VA.getValVT(), ArgValue);
2643 if (VA.isExtInLoc()) {
2644 // Handle MMX values passed in XMM regs.
2645 if (RegVT.isVector() && VA.getValVT().getScalarType() != MVT::i1)
2646 ArgValue = DAG.getNode(X86ISD::MOVDQ2Q, dl, VA.getValVT(), ArgValue);
2648 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2651 assert(VA.isMemLoc());
2652 ArgValue = LowerMemArgument(Chain, CallConv, Ins, dl, DAG, VA, MFI, i);
2655 // If value is passed via pointer - do a load.
2656 if (VA.getLocInfo() == CCValAssign::Indirect)
2657 ArgValue = DAG.getLoad(VA.getValVT(), dl, Chain, ArgValue,
2658 MachinePointerInfo(), false, false, false, 0);
2660 InVals.push_back(ArgValue);
2663 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2664 // All x86 ABIs require that for returning structs by value we copy the
2665 // sret argument into %rax/%eax (depending on ABI) for the return. Save
2666 // the argument into a virtual register so that we can access it from the
2668 if (Ins[i].Flags.isSRet()) {
2669 unsigned Reg = FuncInfo->getSRetReturnReg();
2671 MVT PtrTy = getPointerTy(DAG.getDataLayout());
2672 Reg = MF.getRegInfo().createVirtualRegister(getRegClassFor(PtrTy));
2673 FuncInfo->setSRetReturnReg(Reg);
2675 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[i]);
2676 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
2681 unsigned StackSize = CCInfo.getNextStackOffset();
2682 // Align stack specially for tail calls.
2683 if (FuncIsMadeTailCallSafe(CallConv,
2684 MF.getTarget().Options.GuaranteedTailCallOpt))
2685 StackSize = GetAlignedArgumentStackSize(StackSize, DAG);
2687 // If the function takes variable number of arguments, make a frame index for
2688 // the start of the first vararg value... for expansion of llvm.va_start. We
2689 // can skip this if there are no va_start calls.
2690 if (MFI->hasVAStart() &&
2691 (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
2692 CallConv != CallingConv::X86_ThisCall))) {
2693 FuncInfo->setVarArgsFrameIndex(
2694 MFI->CreateFixedObject(1, StackSize, true));
2697 MachineModuleInfo &MMI = MF.getMMI();
2698 const Function *WinEHParent = nullptr;
2699 if (MMI.hasWinEHFuncInfo(Fn))
2700 WinEHParent = MMI.getWinEHParent(Fn);
2701 bool IsWinEHParent = WinEHParent && WinEHParent == Fn;
2703 // Figure out if XMM registers are in use.
2704 assert(!(Subtarget->useSoftFloat() &&
2705 Fn->hasFnAttribute(Attribute::NoImplicitFloat)) &&
2706 "SSE register cannot be used when SSE is disabled!");
2708 // 64-bit calling conventions support varargs and register parameters, so we
2709 // have to do extra work to spill them in the prologue.
2710 if (Is64Bit && isVarArg && MFI->hasVAStart()) {
2711 // Find the first unallocated argument registers.
2712 ArrayRef<MCPhysReg> ArgGPRs = get64BitArgumentGPRs(CallConv, Subtarget);
2713 ArrayRef<MCPhysReg> ArgXMMs = get64BitArgumentXMMs(MF, CallConv, Subtarget);
2714 unsigned NumIntRegs = CCInfo.getFirstUnallocated(ArgGPRs);
2715 unsigned NumXMMRegs = CCInfo.getFirstUnallocated(ArgXMMs);
2716 assert(!(NumXMMRegs && !Subtarget->hasSSE1()) &&
2717 "SSE register cannot be used when SSE is disabled!");
2719 // Gather all the live in physical registers.
2720 SmallVector<SDValue, 6> LiveGPRs;
2721 SmallVector<SDValue, 8> LiveXMMRegs;
2723 for (MCPhysReg Reg : ArgGPRs.slice(NumIntRegs)) {
2724 unsigned GPR = MF.addLiveIn(Reg, &X86::GR64RegClass);
2726 DAG.getCopyFromReg(Chain, dl, GPR, MVT::i64));
2728 if (!ArgXMMs.empty()) {
2729 unsigned AL = MF.addLiveIn(X86::AL, &X86::GR8RegClass);
2730 ALVal = DAG.getCopyFromReg(Chain, dl, AL, MVT::i8);
2731 for (MCPhysReg Reg : ArgXMMs.slice(NumXMMRegs)) {
2732 unsigned XMMReg = MF.addLiveIn(Reg, &X86::VR128RegClass);
2733 LiveXMMRegs.push_back(
2734 DAG.getCopyFromReg(Chain, dl, XMMReg, MVT::v4f32));
2739 // Get to the caller-allocated home save location. Add 8 to account
2740 // for the return address.
2741 int HomeOffset = TFI.getOffsetOfLocalArea() + 8;
2742 FuncInfo->setRegSaveFrameIndex(
2743 MFI->CreateFixedObject(1, NumIntRegs * 8 + HomeOffset, false));
2744 // Fixup to set vararg frame on shadow area (4 x i64).
2746 FuncInfo->setVarArgsFrameIndex(FuncInfo->getRegSaveFrameIndex());
2748 // For X86-64, if there are vararg parameters that are passed via
2749 // registers, then we must store them to their spots on the stack so
2750 // they may be loaded by deferencing the result of va_next.
2751 FuncInfo->setVarArgsGPOffset(NumIntRegs * 8);
2752 FuncInfo->setVarArgsFPOffset(ArgGPRs.size() * 8 + NumXMMRegs * 16);
2753 FuncInfo->setRegSaveFrameIndex(MFI->CreateStackObject(
2754 ArgGPRs.size() * 8 + ArgXMMs.size() * 16, 16, false));
2757 // Store the integer parameter registers.
2758 SmallVector<SDValue, 8> MemOps;
2759 SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(),
2760 getPointerTy(DAG.getDataLayout()));
2761 unsigned Offset = FuncInfo->getVarArgsGPOffset();
2762 for (SDValue Val : LiveGPRs) {
2763 SDValue FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
2764 RSFIN, DAG.getIntPtrConstant(Offset, dl));
2766 DAG.getStore(Val.getValue(1), dl, Val, FIN,
2767 MachinePointerInfo::getFixedStack(
2768 DAG.getMachineFunction(),
2769 FuncInfo->getRegSaveFrameIndex(), Offset),
2771 MemOps.push_back(Store);
2775 if (!ArgXMMs.empty() && NumXMMRegs != ArgXMMs.size()) {
2776 // Now store the XMM (fp + vector) parameter registers.
2777 SmallVector<SDValue, 12> SaveXMMOps;
2778 SaveXMMOps.push_back(Chain);
2779 SaveXMMOps.push_back(ALVal);
2780 SaveXMMOps.push_back(DAG.getIntPtrConstant(
2781 FuncInfo->getRegSaveFrameIndex(), dl));
2782 SaveXMMOps.push_back(DAG.getIntPtrConstant(
2783 FuncInfo->getVarArgsFPOffset(), dl));
2784 SaveXMMOps.insert(SaveXMMOps.end(), LiveXMMRegs.begin(),
2786 MemOps.push_back(DAG.getNode(X86ISD::VASTART_SAVE_XMM_REGS, dl,
2787 MVT::Other, SaveXMMOps));
2790 if (!MemOps.empty())
2791 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOps);
2794 if (isVarArg && MFI->hasMustTailInVarArgFunc()) {
2795 // Find the largest legal vector type.
2796 MVT VecVT = MVT::Other;
2797 // FIXME: Only some x86_32 calling conventions support AVX512.
2798 if (Subtarget->hasAVX512() &&
2799 (Is64Bit || (CallConv == CallingConv::X86_VectorCall ||
2800 CallConv == CallingConv::Intel_OCL_BI)))
2801 VecVT = MVT::v16f32;
2802 else if (Subtarget->hasAVX())
2804 else if (Subtarget->hasSSE2())
2807 // We forward some GPRs and some vector types.
2808 SmallVector<MVT, 2> RegParmTypes;
2809 MVT IntVT = Is64Bit ? MVT::i64 : MVT::i32;
2810 RegParmTypes.push_back(IntVT);
2811 if (VecVT != MVT::Other)
2812 RegParmTypes.push_back(VecVT);
2814 // Compute the set of forwarded registers. The rest are scratch.
2815 SmallVectorImpl<ForwardedRegister> &Forwards =
2816 FuncInfo->getForwardedMustTailRegParms();
2817 CCInfo.analyzeMustTailForwardedRegisters(Forwards, RegParmTypes, CC_X86);
2819 // Conservatively forward AL on x86_64, since it might be used for varargs.
2820 if (Is64Bit && !CCInfo.isAllocated(X86::AL)) {
2821 unsigned ALVReg = MF.addLiveIn(X86::AL, &X86::GR8RegClass);
2822 Forwards.push_back(ForwardedRegister(ALVReg, X86::AL, MVT::i8));
2825 // Copy all forwards from physical to virtual registers.
2826 for (ForwardedRegister &F : Forwards) {
2827 // FIXME: Can we use a less constrained schedule?
2828 SDValue RegVal = DAG.getCopyFromReg(Chain, dl, F.VReg, F.VT);
2829 F.VReg = MF.getRegInfo().createVirtualRegister(getRegClassFor(F.VT));
2830 Chain = DAG.getCopyToReg(Chain, dl, F.VReg, RegVal);
2834 // Some CCs need callee pop.
2835 if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
2836 MF.getTarget().Options.GuaranteedTailCallOpt)) {
2837 FuncInfo->setBytesToPopOnReturn(StackSize); // Callee pops everything.
2839 FuncInfo->setBytesToPopOnReturn(0); // Callee pops nothing.
2840 // If this is an sret function, the return should pop the hidden pointer.
2841 if (!Is64Bit && !IsTailCallConvention(CallConv) &&
2842 !Subtarget->getTargetTriple().isOSMSVCRT() &&
2843 argsAreStructReturn(Ins) == StackStructReturn)
2844 FuncInfo->setBytesToPopOnReturn(4);
2848 // RegSaveFrameIndex is X86-64 only.
2849 FuncInfo->setRegSaveFrameIndex(0xAAAAAAA);
2850 if (CallConv == CallingConv::X86_FastCall ||
2851 CallConv == CallingConv::X86_ThisCall)
2852 // fastcc functions can't have varargs.
2853 FuncInfo->setVarArgsFrameIndex(0xAAAAAAA);
2856 FuncInfo->setArgumentStackSize(StackSize);
2858 if (IsWinEHParent) {
2860 int UnwindHelpFI = MFI->CreateStackObject(8, 8, /*isSS=*/false);
2861 SDValue StackSlot = DAG.getFrameIndex(UnwindHelpFI, MVT::i64);
2862 MMI.getWinEHFuncInfo(MF.getFunction()).UnwindHelpFrameIdx = UnwindHelpFI;
2863 SDValue Neg2 = DAG.getConstant(-2, dl, MVT::i64);
2864 Chain = DAG.getStore(Chain, dl, Neg2, StackSlot,
2865 MachinePointerInfo::getFixedStack(
2866 DAG.getMachineFunction(), UnwindHelpFI),
2867 /*isVolatile=*/true,
2868 /*isNonTemporal=*/false, /*Alignment=*/0);
2870 // Functions using Win32 EH are considered to have opaque SP adjustments
2871 // to force local variables to be addressed from the frame or base
2873 MFI->setHasOpaqueSPAdjustment(true);
2881 X86TargetLowering::LowerMemOpCallTo(SDValue Chain,
2882 SDValue StackPtr, SDValue Arg,
2883 SDLoc dl, SelectionDAG &DAG,
2884 const CCValAssign &VA,
2885 ISD::ArgFlagsTy Flags) const {
2886 unsigned LocMemOffset = VA.getLocMemOffset();
2887 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset, dl);
2888 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
2890 if (Flags.isByVal())
2891 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
2893 return DAG.getStore(
2894 Chain, dl, Arg, PtrOff,
2895 MachinePointerInfo::getStack(DAG.getMachineFunction(), LocMemOffset),
2899 /// Emit a load of return address if tail call
2900 /// optimization is performed and it is required.
2902 X86TargetLowering::EmitTailCallLoadRetAddr(SelectionDAG &DAG,
2903 SDValue &OutRetAddr, SDValue Chain,
2904 bool IsTailCall, bool Is64Bit,
2905 int FPDiff, SDLoc dl) const {
2906 // Adjust the Return address stack slot.
2907 EVT VT = getPointerTy(DAG.getDataLayout());
2908 OutRetAddr = getReturnAddressFrameIndex(DAG);
2910 // Load the "old" Return address.
2911 OutRetAddr = DAG.getLoad(VT, dl, Chain, OutRetAddr, MachinePointerInfo(),
2912 false, false, false, 0);
2913 return SDValue(OutRetAddr.getNode(), 1);
2916 /// Emit a store of the return address if tail call
2917 /// optimization is performed and it is required (FPDiff!=0).
2918 static SDValue EmitTailCallStoreRetAddr(SelectionDAG &DAG, MachineFunction &MF,
2919 SDValue Chain, SDValue RetAddrFrIdx,
2920 EVT PtrVT, unsigned SlotSize,
2921 int FPDiff, SDLoc dl) {
2922 // Store the return address to the appropriate stack slot.
2923 if (!FPDiff) return Chain;
2924 // Calculate the new stack slot for the return address.
2925 int NewReturnAddrFI =
2926 MF.getFrameInfo()->CreateFixedObject(SlotSize, (int64_t)FPDiff - SlotSize,
2928 SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewReturnAddrFI, PtrVT);
2929 Chain = DAG.getStore(Chain, dl, RetAddrFrIdx, NewRetAddrFrIdx,
2930 MachinePointerInfo::getFixedStack(
2931 DAG.getMachineFunction(), NewReturnAddrFI),
2936 /// Returns a vector_shuffle mask for an movs{s|d}, movd
2937 /// operation of specified width.
2938 static SDValue getMOVL(SelectionDAG &DAG, SDLoc dl, EVT VT, SDValue V1,
2940 unsigned NumElems = VT.getVectorNumElements();
2941 SmallVector<int, 8> Mask;
2942 Mask.push_back(NumElems);
2943 for (unsigned i = 1; i != NumElems; ++i)
2945 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
2949 X86TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
2950 SmallVectorImpl<SDValue> &InVals) const {
2951 SelectionDAG &DAG = CLI.DAG;
2953 SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
2954 SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
2955 SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
2956 SDValue Chain = CLI.Chain;
2957 SDValue Callee = CLI.Callee;
2958 CallingConv::ID CallConv = CLI.CallConv;
2959 bool &isTailCall = CLI.IsTailCall;
2960 bool isVarArg = CLI.IsVarArg;
2962 MachineFunction &MF = DAG.getMachineFunction();
2963 bool Is64Bit = Subtarget->is64Bit();
2964 bool IsWin64 = Subtarget->isCallingConvWin64(CallConv);
2965 StructReturnType SR = callIsStructReturn(Outs);
2966 bool IsSibcall = false;
2967 X86MachineFunctionInfo *X86Info = MF.getInfo<X86MachineFunctionInfo>();
2968 auto Attr = MF.getFunction()->getFnAttribute("disable-tail-calls");
2970 if (Attr.getValueAsString() == "true")
2973 if (Subtarget->isPICStyleGOT() &&
2974 !MF.getTarget().Options.GuaranteedTailCallOpt) {
2975 // If we are using a GOT, disable tail calls to external symbols with
2976 // default visibility. Tail calling such a symbol requires using a GOT
2977 // relocation, which forces early binding of the symbol. This breaks code
2978 // that require lazy function symbol resolution. Using musttail or
2979 // GuaranteedTailCallOpt will override this.
2980 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
2981 if (!G || (!G->getGlobal()->hasLocalLinkage() &&
2982 G->getGlobal()->hasDefaultVisibility()))
2986 bool IsMustTail = CLI.CS && CLI.CS->isMustTailCall();
2988 // Force this to be a tail call. The verifier rules are enough to ensure
2989 // that we can lower this successfully without moving the return address
2992 } else if (isTailCall) {
2993 // Check if it's really possible to do a tail call.
2994 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
2995 isVarArg, SR != NotStructReturn,
2996 MF.getFunction()->hasStructRetAttr(), CLI.RetTy,
2997 Outs, OutVals, Ins, DAG);
2999 // Sibcalls are automatically detected tailcalls which do not require
3001 if (!MF.getTarget().Options.GuaranteedTailCallOpt && isTailCall)
3008 assert(!(isVarArg && IsTailCallConvention(CallConv)) &&
3009 "Var args not supported with calling convention fastcc, ghc or hipe");
3011 // Analyze operands of the call, assigning locations to each operand.
3012 SmallVector<CCValAssign, 16> ArgLocs;
3013 CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
3015 // Allocate shadow area for Win64
3017 CCInfo.AllocateStack(32, 8);
3019 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3021 // Get a count of how many bytes are to be pushed on the stack.
3022 unsigned NumBytes = CCInfo.getAlignedCallFrameSize();
3024 // This is a sibcall. The memory operands are available in caller's
3025 // own caller's stack.
3027 else if (MF.getTarget().Options.GuaranteedTailCallOpt &&
3028 IsTailCallConvention(CallConv))
3029 NumBytes = GetAlignedArgumentStackSize(NumBytes, DAG);
3032 if (isTailCall && !IsSibcall && !IsMustTail) {
3033 // Lower arguments at fp - stackoffset + fpdiff.
3034 unsigned NumBytesCallerPushed = X86Info->getBytesToPopOnReturn();
3036 FPDiff = NumBytesCallerPushed - NumBytes;
3038 // Set the delta of movement of the returnaddr stackslot.
3039 // But only set if delta is greater than previous delta.
3040 if (FPDiff < X86Info->getTCReturnAddrDelta())
3041 X86Info->setTCReturnAddrDelta(FPDiff);
3044 unsigned NumBytesToPush = NumBytes;
3045 unsigned NumBytesToPop = NumBytes;
3047 // If we have an inalloca argument, all stack space has already been allocated
3048 // for us and be right at the top of the stack. We don't support multiple
3049 // arguments passed in memory when using inalloca.
3050 if (!Outs.empty() && Outs.back().Flags.isInAlloca()) {
3052 if (!ArgLocs.back().isMemLoc())
3053 report_fatal_error("cannot use inalloca attribute on a register "
3055 if (ArgLocs.back().getLocMemOffset() != 0)
3056 report_fatal_error("any parameter with the inalloca attribute must be "
3057 "the only memory argument");
3061 Chain = DAG.getCALLSEQ_START(
3062 Chain, DAG.getIntPtrConstant(NumBytesToPush, dl, true), dl);
3064 SDValue RetAddrFrIdx;
3065 // Load return address for tail calls.
3066 if (isTailCall && FPDiff)
3067 Chain = EmitTailCallLoadRetAddr(DAG, RetAddrFrIdx, Chain, isTailCall,
3068 Is64Bit, FPDiff, dl);
3070 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
3071 SmallVector<SDValue, 8> MemOpChains;
3074 // Walk the register/memloc assignments, inserting copies/loads. In the case
3075 // of tail call optimization arguments are handle later.
3076 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3077 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3078 // Skip inalloca arguments, they have already been written.
3079 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3080 if (Flags.isInAlloca())
3083 CCValAssign &VA = ArgLocs[i];
3084 EVT RegVT = VA.getLocVT();
3085 SDValue Arg = OutVals[i];
3086 bool isByVal = Flags.isByVal();
3088 // Promote the value if needed.
3089 switch (VA.getLocInfo()) {
3090 default: llvm_unreachable("Unknown loc info!");
3091 case CCValAssign::Full: break;
3092 case CCValAssign::SExt:
3093 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
3095 case CCValAssign::ZExt:
3096 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, RegVT, Arg);
3098 case CCValAssign::AExt:
3099 if (Arg.getValueType().isVector() &&
3100 Arg.getValueType().getScalarType() == MVT::i1)
3101 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
3102 else if (RegVT.is128BitVector()) {
3103 // Special case: passing MMX values in XMM registers.
3104 Arg = DAG.getBitcast(MVT::i64, Arg);
3105 Arg = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64, Arg);
3106 Arg = getMOVL(DAG, dl, MVT::v2i64, DAG.getUNDEF(MVT::v2i64), Arg);
3108 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, RegVT, Arg);
3110 case CCValAssign::BCvt:
3111 Arg = DAG.getBitcast(RegVT, Arg);
3113 case CCValAssign::Indirect: {
3114 // Store the argument.
3115 SDValue SpillSlot = DAG.CreateStackTemporary(VA.getValVT());
3116 int FI = cast<FrameIndexSDNode>(SpillSlot)->getIndex();
3117 Chain = DAG.getStore(
3118 Chain, dl, Arg, SpillSlot,
3119 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
3126 if (VA.isRegLoc()) {
3127 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
3128 if (isVarArg && IsWin64) {
3129 // Win64 ABI requires argument XMM reg to be copied to the corresponding
3130 // shadow reg if callee is a varargs function.
3131 unsigned ShadowReg = 0;
3132 switch (VA.getLocReg()) {
3133 case X86::XMM0: ShadowReg = X86::RCX; break;
3134 case X86::XMM1: ShadowReg = X86::RDX; break;
3135 case X86::XMM2: ShadowReg = X86::R8; break;
3136 case X86::XMM3: ShadowReg = X86::R9; break;
3139 RegsToPass.push_back(std::make_pair(ShadowReg, Arg));
3141 } else if (!IsSibcall && (!isTailCall || isByVal)) {
3142 assert(VA.isMemLoc());
3143 if (!StackPtr.getNode())
3144 StackPtr = DAG.getCopyFromReg(Chain, dl, RegInfo->getStackRegister(),
3145 getPointerTy(DAG.getDataLayout()));
3146 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
3147 dl, DAG, VA, Flags));
3151 if (!MemOpChains.empty())
3152 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
3154 if (Subtarget->isPICStyleGOT()) {
3155 // ELF / PIC requires GOT in the EBX register before function calls via PLT
3158 RegsToPass.push_back(std::make_pair(
3159 unsigned(X86::EBX), DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(),
3160 getPointerTy(DAG.getDataLayout()))));
3162 // If we are tail calling and generating PIC/GOT style code load the
3163 // address of the callee into ECX. The value in ecx is used as target of
3164 // the tail jump. This is done to circumvent the ebx/callee-saved problem
3165 // for tail calls on PIC/GOT architectures. Normally we would just put the
3166 // address of GOT into ebx and then call target@PLT. But for tail calls
3167 // ebx would be restored (since ebx is callee saved) before jumping to the
3170 // Note: The actual moving to ECX is done further down.
3171 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
3172 if (G && !G->getGlobal()->hasLocalLinkage() &&
3173 G->getGlobal()->hasDefaultVisibility())
3174 Callee = LowerGlobalAddress(Callee, DAG);
3175 else if (isa<ExternalSymbolSDNode>(Callee))
3176 Callee = LowerExternalSymbol(Callee, DAG);
3180 if (Is64Bit && isVarArg && !IsWin64 && !IsMustTail) {
3181 // From AMD64 ABI document:
3182 // For calls that may call functions that use varargs or stdargs
3183 // (prototype-less calls or calls to functions containing ellipsis (...) in
3184 // the declaration) %al is used as hidden argument to specify the number
3185 // of SSE registers used. The contents of %al do not need to match exactly
3186 // the number of registers, but must be an ubound on the number of SSE
3187 // registers used and is in the range 0 - 8 inclusive.
3189 // Count the number of XMM registers allocated.
3190 static const MCPhysReg XMMArgRegs[] = {
3191 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
3192 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
3194 unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs);
3195 assert((Subtarget->hasSSE1() || !NumXMMRegs)
3196 && "SSE registers cannot be used when SSE is disabled");
3198 RegsToPass.push_back(std::make_pair(unsigned(X86::AL),
3199 DAG.getConstant(NumXMMRegs, dl,
3203 if (isVarArg && IsMustTail) {
3204 const auto &Forwards = X86Info->getForwardedMustTailRegParms();
3205 for (const auto &F : Forwards) {
3206 SDValue Val = DAG.getCopyFromReg(Chain, dl, F.VReg, F.VT);
3207 RegsToPass.push_back(std::make_pair(unsigned(F.PReg), Val));
3211 // For tail calls lower the arguments to the 'real' stack slots. Sibcalls
3212 // don't need this because the eligibility check rejects calls that require
3213 // shuffling arguments passed in memory.
3214 if (!IsSibcall && isTailCall) {
3215 // Force all the incoming stack arguments to be loaded from the stack
3216 // before any new outgoing arguments are stored to the stack, because the
3217 // outgoing stack slots may alias the incoming argument stack slots, and
3218 // the alias isn't otherwise explicit. This is slightly more conservative
3219 // than necessary, because it means that each store effectively depends
3220 // on every argument instead of just those arguments it would clobber.
3221 SDValue ArgChain = DAG.getStackArgumentTokenFactor(Chain);
3223 SmallVector<SDValue, 8> MemOpChains2;
3226 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3227 CCValAssign &VA = ArgLocs[i];
3230 assert(VA.isMemLoc());
3231 SDValue Arg = OutVals[i];
3232 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3233 // Skip inalloca arguments. They don't require any work.
3234 if (Flags.isInAlloca())
3236 // Create frame index.
3237 int32_t Offset = VA.getLocMemOffset()+FPDiff;
3238 uint32_t OpSize = (VA.getLocVT().getSizeInBits()+7)/8;
3239 FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
3240 FIN = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
3242 if (Flags.isByVal()) {
3243 // Copy relative to framepointer.
3244 SDValue Source = DAG.getIntPtrConstant(VA.getLocMemOffset(), dl);
3245 if (!StackPtr.getNode())
3246 StackPtr = DAG.getCopyFromReg(Chain, dl, RegInfo->getStackRegister(),
3247 getPointerTy(DAG.getDataLayout()));
3248 Source = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
3251 MemOpChains2.push_back(CreateCopyOfByValArgument(Source, FIN,
3255 // Store relative to framepointer.
3256 MemOpChains2.push_back(DAG.getStore(
3257 ArgChain, dl, Arg, FIN,
3258 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
3263 if (!MemOpChains2.empty())
3264 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains2);
3266 // Store the return address to the appropriate stack slot.
3267 Chain = EmitTailCallStoreRetAddr(DAG, MF, Chain, RetAddrFrIdx,
3268 getPointerTy(DAG.getDataLayout()),
3269 RegInfo->getSlotSize(), FPDiff, dl);
3272 // Build a sequence of copy-to-reg nodes chained together with token chain
3273 // and flag operands which copy the outgoing args into registers.
3275 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
3276 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
3277 RegsToPass[i].second, InFlag);
3278 InFlag = Chain.getValue(1);
3281 if (DAG.getTarget().getCodeModel() == CodeModel::Large) {
3282 assert(Is64Bit && "Large code model is only legal in 64-bit mode.");
3283 // In the 64-bit large code model, we have to make all calls
3284 // through a register, since the call instruction's 32-bit
3285 // pc-relative offset may not be large enough to hold the whole
3287 } else if (Callee->getOpcode() == ISD::GlobalAddress) {
3288 // If the callee is a GlobalAddress node (quite common, every direct call
3289 // is) turn it into a TargetGlobalAddress node so that legalize doesn't hack
3291 GlobalAddressSDNode* G = cast<GlobalAddressSDNode>(Callee);
3293 // We should use extra load for direct calls to dllimported functions in
3295 const GlobalValue *GV = G->getGlobal();
3296 if (!GV->hasDLLImportStorageClass()) {
3297 unsigned char OpFlags = 0;
3298 bool ExtraLoad = false;
3299 unsigned WrapperKind = ISD::DELETED_NODE;
3301 // On ELF targets, in both X86-64 and X86-32 mode, direct calls to
3302 // external symbols most go through the PLT in PIC mode. If the symbol
3303 // has hidden or protected visibility, or if it is static or local, then
3304 // we don't need to use the PLT - we can directly call it.
3305 if (Subtarget->isTargetELF() &&
3306 DAG.getTarget().getRelocationModel() == Reloc::PIC_ &&
3307 GV->hasDefaultVisibility() && !GV->hasLocalLinkage()) {
3308 OpFlags = X86II::MO_PLT;
3309 } else if (Subtarget->isPICStyleStubAny() &&
3310 !GV->isStrongDefinitionForLinker() &&
3311 (!Subtarget->getTargetTriple().isMacOSX() ||
3312 Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
3313 // PC-relative references to external symbols should go through $stub,
3314 // unless we're building with the leopard linker or later, which
3315 // automatically synthesizes these stubs.
3316 OpFlags = X86II::MO_DARWIN_STUB;
3317 } else if (Subtarget->isPICStyleRIPRel() && isa<Function>(GV) &&
3318 cast<Function>(GV)->hasFnAttribute(Attribute::NonLazyBind)) {
3319 // If the function is marked as non-lazy, generate an indirect call
3320 // which loads from the GOT directly. This avoids runtime overhead
3321 // at the cost of eager binding (and one extra byte of encoding).
3322 OpFlags = X86II::MO_GOTPCREL;
3323 WrapperKind = X86ISD::WrapperRIP;
3327 Callee = DAG.getTargetGlobalAddress(
3328 GV, dl, getPointerTy(DAG.getDataLayout()), G->getOffset(), OpFlags);
3330 // Add a wrapper if needed.
3331 if (WrapperKind != ISD::DELETED_NODE)
3332 Callee = DAG.getNode(X86ISD::WrapperRIP, dl,
3333 getPointerTy(DAG.getDataLayout()), Callee);
3334 // Add extra indirection if needed.
3336 Callee = DAG.getLoad(
3337 getPointerTy(DAG.getDataLayout()), dl, DAG.getEntryNode(), Callee,
3338 MachinePointerInfo::getGOT(DAG.getMachineFunction()), false, false,
3341 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
3342 unsigned char OpFlags = 0;
3344 // On ELF targets, in either X86-64 or X86-32 mode, direct calls to
3345 // external symbols should go through the PLT.
3346 if (Subtarget->isTargetELF() &&
3347 DAG.getTarget().getRelocationModel() == Reloc::PIC_) {
3348 OpFlags = X86II::MO_PLT;
3349 } else if (Subtarget->isPICStyleStubAny() &&
3350 (!Subtarget->getTargetTriple().isMacOSX() ||
3351 Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
3352 // PC-relative references to external symbols should go through $stub,
3353 // unless we're building with the leopard linker or later, which
3354 // automatically synthesizes these stubs.
3355 OpFlags = X86II::MO_DARWIN_STUB;
3358 Callee = DAG.getTargetExternalSymbol(
3359 S->getSymbol(), getPointerTy(DAG.getDataLayout()), OpFlags);
3360 } else if (Subtarget->isTarget64BitILP32() &&
3361 Callee->getValueType(0) == MVT::i32) {
3362 // Zero-extend the 32-bit Callee address into a 64-bit according to x32 ABI
3363 Callee = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i64, Callee);
3366 // Returns a chain & a flag for retval copy to use.
3367 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
3368 SmallVector<SDValue, 8> Ops;
3370 if (!IsSibcall && isTailCall) {
3371 Chain = DAG.getCALLSEQ_END(Chain,
3372 DAG.getIntPtrConstant(NumBytesToPop, dl, true),
3373 DAG.getIntPtrConstant(0, dl, true), InFlag, dl);
3374 InFlag = Chain.getValue(1);
3377 Ops.push_back(Chain);
3378 Ops.push_back(Callee);
3381 Ops.push_back(DAG.getConstant(FPDiff, dl, MVT::i32));
3383 // Add argument registers to the end of the list so that they are known live
3385 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
3386 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
3387 RegsToPass[i].second.getValueType()));
3389 // Add a register mask operand representing the call-preserved registers.
3390 const uint32_t *Mask = RegInfo->getCallPreservedMask(MF, CallConv);
3391 assert(Mask && "Missing call preserved mask for calling convention");
3393 // If this is an invoke in a 32-bit function using an MSVC personality, assume
3394 // the function clobbers all registers. If an exception is thrown, the runtime
3395 // will not restore CSRs.
3396 // FIXME: Model this more precisely so that we can register allocate across
3397 // the normal edge and spill and fill across the exceptional edge.
3398 if (!Is64Bit && CLI.CS && CLI.CS->isInvoke()) {
3399 const Function *CallerFn = MF.getFunction();
3400 EHPersonality Pers =
3401 CallerFn->hasPersonalityFn()
3402 ? classifyEHPersonality(CallerFn->getPersonalityFn())
3403 : EHPersonality::Unknown;
3404 if (isMSVCEHPersonality(Pers))
3405 Mask = RegInfo->getNoPreservedMask();
3408 Ops.push_back(DAG.getRegisterMask(Mask));
3410 if (InFlag.getNode())
3411 Ops.push_back(InFlag);
3415 //// If this is the first return lowered for this function, add the regs
3416 //// to the liveout set for the function.
3417 // This isn't right, although it's probably harmless on x86; liveouts
3418 // should be computed from returns not tail calls. Consider a void
3419 // function making a tail call to a function returning int.
3420 MF.getFrameInfo()->setHasTailCall();
3421 return DAG.getNode(X86ISD::TC_RETURN, dl, NodeTys, Ops);
3424 Chain = DAG.getNode(X86ISD::CALL, dl, NodeTys, Ops);
3425 InFlag = Chain.getValue(1);
3427 // Create the CALLSEQ_END node.
3428 unsigned NumBytesForCalleeToPop;
3429 if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
3430 DAG.getTarget().Options.GuaranteedTailCallOpt))
3431 NumBytesForCalleeToPop = NumBytes; // Callee pops everything
3432 else if (!Is64Bit && !IsTailCallConvention(CallConv) &&
3433 !Subtarget->getTargetTriple().isOSMSVCRT() &&
3434 SR == StackStructReturn)
3435 // If this is a call to a struct-return function, the callee
3436 // pops the hidden struct pointer, so we have to push it back.
3437 // This is common for Darwin/X86, Linux & Mingw32 targets.
3438 // For MSVC Win32 targets, the caller pops the hidden struct pointer.
3439 NumBytesForCalleeToPop = 4;
3441 NumBytesForCalleeToPop = 0; // Callee pops nothing.
3443 // Returns a flag for retval copy to use.
3445 Chain = DAG.getCALLSEQ_END(Chain,
3446 DAG.getIntPtrConstant(NumBytesToPop, dl, true),
3447 DAG.getIntPtrConstant(NumBytesForCalleeToPop, dl,
3450 InFlag = Chain.getValue(1);
3453 // Handle result values, copying them out of physregs into vregs that we
3455 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
3456 Ins, dl, DAG, InVals);
3459 //===----------------------------------------------------------------------===//
3460 // Fast Calling Convention (tail call) implementation
3461 //===----------------------------------------------------------------------===//
3463 // Like std call, callee cleans arguments, convention except that ECX is
3464 // reserved for storing the tail called function address. Only 2 registers are
3465 // free for argument passing (inreg). Tail call optimization is performed
3467 // * tailcallopt is enabled
3468 // * caller/callee are fastcc
3469 // On X86_64 architecture with GOT-style position independent code only local
3470 // (within module) calls are supported at the moment.
3471 // To keep the stack aligned according to platform abi the function
3472 // GetAlignedArgumentStackSize ensures that argument delta is always multiples
3473 // of stack alignment. (Dynamic linkers need this - darwin's dyld for example)
3474 // If a tail called function callee has more arguments than the caller the
3475 // caller needs to make sure that there is room to move the RETADDR to. This is
3476 // achieved by reserving an area the size of the argument delta right after the
3477 // original RETADDR, but before the saved framepointer or the spilled registers
3478 // e.g. caller(arg1, arg2) calls callee(arg1, arg2,arg3,arg4)
3490 /// Make the stack size align e.g 16n + 12 aligned for a 16-byte align
3493 X86TargetLowering::GetAlignedArgumentStackSize(unsigned StackSize,
3494 SelectionDAG& DAG) const {
3495 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3496 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
3497 unsigned StackAlignment = TFI.getStackAlignment();
3498 uint64_t AlignMask = StackAlignment - 1;
3499 int64_t Offset = StackSize;
3500 unsigned SlotSize = RegInfo->getSlotSize();
3501 if ( (Offset & AlignMask) <= (StackAlignment - SlotSize) ) {
3502 // Number smaller than 12 so just add the difference.
3503 Offset += ((StackAlignment - SlotSize) - (Offset & AlignMask));
3505 // Mask out lower bits, add stackalignment once plus the 12 bytes.
3506 Offset = ((~AlignMask) & Offset) + StackAlignment +
3507 (StackAlignment-SlotSize);
3512 /// Return true if the given stack call argument is already available in the
3513 /// same position (relatively) of the caller's incoming argument stack.
3515 bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
3516 MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
3517 const X86InstrInfo *TII) {
3518 unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
3520 if (Arg.getOpcode() == ISD::CopyFromReg) {
3521 unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
3522 if (!TargetRegisterInfo::isVirtualRegister(VR))
3524 MachineInstr *Def = MRI->getVRegDef(VR);
3527 if (!Flags.isByVal()) {
3528 if (!TII->isLoadFromStackSlot(Def, FI))
3531 unsigned Opcode = Def->getOpcode();
3532 if ((Opcode == X86::LEA32r || Opcode == X86::LEA64r ||
3533 Opcode == X86::LEA64_32r) &&
3534 Def->getOperand(1).isFI()) {
3535 FI = Def->getOperand(1).getIndex();
3536 Bytes = Flags.getByValSize();
3540 } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
3541 if (Flags.isByVal())
3542 // ByVal argument is passed in as a pointer but it's now being
3543 // dereferenced. e.g.
3544 // define @foo(%struct.X* %A) {
3545 // tail call @bar(%struct.X* byval %A)
3548 SDValue Ptr = Ld->getBasePtr();
3549 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
3552 FI = FINode->getIndex();
3553 } else if (Arg.getOpcode() == ISD::FrameIndex && Flags.isByVal()) {
3554 FrameIndexSDNode *FINode = cast<FrameIndexSDNode>(Arg);
3555 FI = FINode->getIndex();
3556 Bytes = Flags.getByValSize();
3560 assert(FI != INT_MAX);
3561 if (!MFI->isFixedObjectIndex(FI))
3563 return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
3566 /// Check whether the call is eligible for tail call optimization. Targets
3567 /// that want to do tail call optimization should implement this function.
3568 bool X86TargetLowering::IsEligibleForTailCallOptimization(
3569 SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
3570 bool isCalleeStructRet, bool isCallerStructRet, Type *RetTy,
3571 const SmallVectorImpl<ISD::OutputArg> &Outs,
3572 const SmallVectorImpl<SDValue> &OutVals,
3573 const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const {
3574 if (!IsTailCallConvention(CalleeCC) && !IsCCallConvention(CalleeCC))
3577 // If -tailcallopt is specified, make fastcc functions tail-callable.
3578 const MachineFunction &MF = DAG.getMachineFunction();
3579 const Function *CallerF = MF.getFunction();
3581 // If the function return type is x86_fp80 and the callee return type is not,
3582 // then the FP_EXTEND of the call result is not a nop. It's not safe to
3583 // perform a tailcall optimization here.
3584 if (CallerF->getReturnType()->isX86_FP80Ty() && !RetTy->isX86_FP80Ty())
3587 CallingConv::ID CallerCC = CallerF->getCallingConv();
3588 bool CCMatch = CallerCC == CalleeCC;
3589 bool IsCalleeWin64 = Subtarget->isCallingConvWin64(CalleeCC);
3590 bool IsCallerWin64 = Subtarget->isCallingConvWin64(CallerCC);
3592 // Win64 functions have extra shadow space for argument homing. Don't do the
3593 // sibcall if the caller and callee have mismatched expectations for this
3595 if (IsCalleeWin64 != IsCallerWin64)
3598 if (DAG.getTarget().Options.GuaranteedTailCallOpt) {
3599 if (IsTailCallConvention(CalleeCC) && CCMatch)
3604 // Look for obvious safe cases to perform tail call optimization that do not
3605 // require ABI changes. This is what gcc calls sibcall.
3607 // Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to
3608 // emit a special epilogue.
3609 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3610 if (RegInfo->needsStackRealignment(MF))
3613 // Also avoid sibcall optimization if either caller or callee uses struct
3614 // return semantics.
3615 if (isCalleeStructRet || isCallerStructRet)
3618 // An stdcall/thiscall caller is expected to clean up its arguments; the
3619 // callee isn't going to do that.
3620 // FIXME: this is more restrictive than needed. We could produce a tailcall
3621 // when the stack adjustment matches. For example, with a thiscall that takes
3622 // only one argument.
3623 if (!CCMatch && (CallerCC == CallingConv::X86_StdCall ||
3624 CallerCC == CallingConv::X86_ThisCall))
3627 // Do not sibcall optimize vararg calls unless all arguments are passed via
3629 if (isVarArg && !Outs.empty()) {
3631 // Optimizing for varargs on Win64 is unlikely to be safe without
3632 // additional testing.
3633 if (IsCalleeWin64 || IsCallerWin64)
3636 SmallVector<CCValAssign, 16> ArgLocs;
3637 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(), ArgLocs,
3640 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3641 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i)
3642 if (!ArgLocs[i].isRegLoc())
3646 // If the call result is in ST0 / ST1, it needs to be popped off the x87
3647 // stack. Therefore, if it's not used by the call it is not safe to optimize
3648 // this into a sibcall.
3649 bool Unused = false;
3650 for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
3657 SmallVector<CCValAssign, 16> RVLocs;
3658 CCState CCInfo(CalleeCC, false, DAG.getMachineFunction(), RVLocs,
3660 CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
3661 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
3662 CCValAssign &VA = RVLocs[i];
3663 if (VA.getLocReg() == X86::FP0 || VA.getLocReg() == X86::FP1)
3668 // If the calling conventions do not match, then we'd better make sure the
3669 // results are returned in the same way as what the caller expects.
3671 SmallVector<CCValAssign, 16> RVLocs1;
3672 CCState CCInfo1(CalleeCC, false, DAG.getMachineFunction(), RVLocs1,
3674 CCInfo1.AnalyzeCallResult(Ins, RetCC_X86);
3676 SmallVector<CCValAssign, 16> RVLocs2;
3677 CCState CCInfo2(CallerCC, false, DAG.getMachineFunction(), RVLocs2,
3679 CCInfo2.AnalyzeCallResult(Ins, RetCC_X86);
3681 if (RVLocs1.size() != RVLocs2.size())
3683 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
3684 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
3686 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
3688 if (RVLocs1[i].isRegLoc()) {
3689 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
3692 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
3698 // If the callee takes no arguments then go on to check the results of the
3700 if (!Outs.empty()) {
3701 // Check if stack adjustment is needed. For now, do not do this if any
3702 // argument is passed on the stack.
3703 SmallVector<CCValAssign, 16> ArgLocs;
3704 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(), ArgLocs,
3707 // Allocate shadow area for Win64
3709 CCInfo.AllocateStack(32, 8);
3711 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3712 if (CCInfo.getNextStackOffset()) {
3713 MachineFunction &MF = DAG.getMachineFunction();
3714 if (MF.getInfo<X86MachineFunctionInfo>()->getBytesToPopOnReturn())
3717 // Check if the arguments are already laid out in the right way as
3718 // the caller's fixed stack objects.
3719 MachineFrameInfo *MFI = MF.getFrameInfo();
3720 const MachineRegisterInfo *MRI = &MF.getRegInfo();
3721 const X86InstrInfo *TII = Subtarget->getInstrInfo();
3722 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3723 CCValAssign &VA = ArgLocs[i];
3724 SDValue Arg = OutVals[i];
3725 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3726 if (VA.getLocInfo() == CCValAssign::Indirect)
3728 if (!VA.isRegLoc()) {
3729 if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
3736 // If the tailcall address may be in a register, then make sure it's
3737 // possible to register allocate for it. In 32-bit, the call address can
3738 // only target EAX, EDX, or ECX since the tail call must be scheduled after
3739 // callee-saved registers are restored. These happen to be the same
3740 // registers used to pass 'inreg' arguments so watch out for those.
3741 if (!Subtarget->is64Bit() &&
3742 ((!isa<GlobalAddressSDNode>(Callee) &&
3743 !isa<ExternalSymbolSDNode>(Callee)) ||
3744 DAG.getTarget().getRelocationModel() == Reloc::PIC_)) {
3745 unsigned NumInRegs = 0;
3746 // In PIC we need an extra register to formulate the address computation
3748 unsigned MaxInRegs =
3749 (DAG.getTarget().getRelocationModel() == Reloc::PIC_) ? 2 : 3;
3751 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3752 CCValAssign &VA = ArgLocs[i];
3755 unsigned Reg = VA.getLocReg();
3758 case X86::EAX: case X86::EDX: case X86::ECX:
3759 if (++NumInRegs == MaxInRegs)
3771 X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
3772 const TargetLibraryInfo *libInfo) const {
3773 return X86::createFastISel(funcInfo, libInfo);
3776 //===----------------------------------------------------------------------===//
3777 // Other Lowering Hooks
3778 //===----------------------------------------------------------------------===//
3780 static bool MayFoldLoad(SDValue Op) {
3781 return Op.hasOneUse() && ISD::isNormalLoad(Op.getNode());
3784 static bool MayFoldIntoStore(SDValue Op) {
3785 return Op.hasOneUse() && ISD::isNormalStore(*Op.getNode()->use_begin());
3788 static bool isTargetShuffle(unsigned Opcode) {
3790 default: return false;
3791 case X86ISD::BLENDI:
3792 case X86ISD::PSHUFB:
3793 case X86ISD::PSHUFD:
3794 case X86ISD::PSHUFHW:
3795 case X86ISD::PSHUFLW:
3797 case X86ISD::PALIGNR:
3798 case X86ISD::MOVLHPS:
3799 case X86ISD::MOVLHPD:
3800 case X86ISD::MOVHLPS:
3801 case X86ISD::MOVLPS:
3802 case X86ISD::MOVLPD:
3803 case X86ISD::MOVSHDUP:
3804 case X86ISD::MOVSLDUP:
3805 case X86ISD::MOVDDUP:
3808 case X86ISD::UNPCKL:
3809 case X86ISD::UNPCKH:
3810 case X86ISD::VPERMILPI:
3811 case X86ISD::VPERM2X128:
3812 case X86ISD::VPERMI:
3813 case X86ISD::VPERMV:
3814 case X86ISD::VPERMV3:
3819 static SDValue getTargetShuffleNode(unsigned Opc, SDLoc dl, EVT VT,
3820 SDValue V1, unsigned TargetMask,
3821 SelectionDAG &DAG) {
3823 default: llvm_unreachable("Unknown x86 shuffle node");
3824 case X86ISD::PSHUFD:
3825 case X86ISD::PSHUFHW:
3826 case X86ISD::PSHUFLW:
3827 case X86ISD::VPERMILPI:
3828 case X86ISD::VPERMI:
3829 return DAG.getNode(Opc, dl, VT, V1,
3830 DAG.getConstant(TargetMask, dl, MVT::i8));
3834 static SDValue getTargetShuffleNode(unsigned Opc, SDLoc dl, EVT VT,
3835 SDValue V1, SDValue V2, SelectionDAG &DAG) {
3837 default: llvm_unreachable("Unknown x86 shuffle node");
3838 case X86ISD::MOVLHPS:
3839 case X86ISD::MOVLHPD:
3840 case X86ISD::MOVHLPS:
3841 case X86ISD::MOVLPS:
3842 case X86ISD::MOVLPD:
3845 case X86ISD::UNPCKL:
3846 case X86ISD::UNPCKH:
3847 return DAG.getNode(Opc, dl, VT, V1, V2);
3851 SDValue X86TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
3852 MachineFunction &MF = DAG.getMachineFunction();
3853 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3854 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
3855 int ReturnAddrIndex = FuncInfo->getRAIndex();
3857 if (ReturnAddrIndex == 0) {
3858 // Set up a frame object for the return address.
3859 unsigned SlotSize = RegInfo->getSlotSize();
3860 ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize,
3863 FuncInfo->setRAIndex(ReturnAddrIndex);
3866 return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy(DAG.getDataLayout()));
3869 bool X86::isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
3870 bool hasSymbolicDisplacement) {
3871 // Offset should fit into 32 bit immediate field.
3872 if (!isInt<32>(Offset))
3875 // If we don't have a symbolic displacement - we don't have any extra
3877 if (!hasSymbolicDisplacement)
3880 // FIXME: Some tweaks might be needed for medium code model.
3881 if (M != CodeModel::Small && M != CodeModel::Kernel)
3884 // For small code model we assume that latest object is 16MB before end of 31
3885 // bits boundary. We may also accept pretty large negative constants knowing
3886 // that all objects are in the positive half of address space.
3887 if (M == CodeModel::Small && Offset < 16*1024*1024)
3890 // For kernel code model we know that all object resist in the negative half
3891 // of 32bits address space. We may not accept negative offsets, since they may
3892 // be just off and we may accept pretty large positive ones.
3893 if (M == CodeModel::Kernel && Offset >= 0)
3899 /// Determines whether the callee is required to pop its own arguments.
3900 /// Callee pop is necessary to support tail calls.
3901 bool X86::isCalleePop(CallingConv::ID CallingConv,
3902 bool is64Bit, bool IsVarArg, bool TailCallOpt) {
3904 if (IsTailCallConvention(CallingConv))
3905 return IsVarArg ? false : TailCallOpt;
3907 switch (CallingConv) {
3910 case CallingConv::X86_StdCall:
3911 case CallingConv::X86_FastCall:
3912 case CallingConv::X86_ThisCall:
3917 /// \brief Return true if the condition is an unsigned comparison operation.
3918 static bool isX86CCUnsigned(unsigned X86CC) {
3920 default: llvm_unreachable("Invalid integer condition!");
3921 case X86::COND_E: return true;
3922 case X86::COND_G: return false;
3923 case X86::COND_GE: return false;
3924 case X86::COND_L: return false;
3925 case X86::COND_LE: return false;
3926 case X86::COND_NE: return true;
3927 case X86::COND_B: return true;
3928 case X86::COND_A: return true;
3929 case X86::COND_BE: return true;
3930 case X86::COND_AE: return true;
3932 llvm_unreachable("covered switch fell through?!");
3935 /// Do a one-to-one translation of a ISD::CondCode to the X86-specific
3936 /// condition code, returning the condition code and the LHS/RHS of the
3937 /// comparison to make.
3938 static unsigned TranslateX86CC(ISD::CondCode SetCCOpcode, SDLoc DL, bool isFP,
3939 SDValue &LHS, SDValue &RHS, SelectionDAG &DAG) {
3941 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
3942 if (SetCCOpcode == ISD::SETGT && RHSC->isAllOnesValue()) {
3943 // X > -1 -> X == 0, jump !sign.
3944 RHS = DAG.getConstant(0, DL, RHS.getValueType());
3945 return X86::COND_NS;
3947 if (SetCCOpcode == ISD::SETLT && RHSC->isNullValue()) {
3948 // X < 0 -> X == 0, jump on sign.
3951 if (SetCCOpcode == ISD::SETLT && RHSC->getZExtValue() == 1) {
3953 RHS = DAG.getConstant(0, DL, RHS.getValueType());
3954 return X86::COND_LE;
3958 switch (SetCCOpcode) {
3959 default: llvm_unreachable("Invalid integer condition!");
3960 case ISD::SETEQ: return X86::COND_E;
3961 case ISD::SETGT: return X86::COND_G;
3962 case ISD::SETGE: return X86::COND_GE;
3963 case ISD::SETLT: return X86::COND_L;
3964 case ISD::SETLE: return X86::COND_LE;
3965 case ISD::SETNE: return X86::COND_NE;
3966 case ISD::SETULT: return X86::COND_B;
3967 case ISD::SETUGT: return X86::COND_A;
3968 case ISD::SETULE: return X86::COND_BE;
3969 case ISD::SETUGE: return X86::COND_AE;
3973 // First determine if it is required or is profitable to flip the operands.
3975 // If LHS is a foldable load, but RHS is not, flip the condition.
3976 if (ISD::isNON_EXTLoad(LHS.getNode()) &&
3977 !ISD::isNON_EXTLoad(RHS.getNode())) {
3978 SetCCOpcode = getSetCCSwappedOperands(SetCCOpcode);
3979 std::swap(LHS, RHS);
3982 switch (SetCCOpcode) {
3988 std::swap(LHS, RHS);
3992 // On a floating point condition, the flags are set as follows:
3994 // 0 | 0 | 0 | X > Y
3995 // 0 | 0 | 1 | X < Y
3996 // 1 | 0 | 0 | X == Y
3997 // 1 | 1 | 1 | unordered
3998 switch (SetCCOpcode) {
3999 default: llvm_unreachable("Condcode should be pre-legalized away");
4001 case ISD::SETEQ: return X86::COND_E;
4002 case ISD::SETOLT: // flipped
4004 case ISD::SETGT: return X86::COND_A;
4005 case ISD::SETOLE: // flipped
4007 case ISD::SETGE: return X86::COND_AE;
4008 case ISD::SETUGT: // flipped
4010 case ISD::SETLT: return X86::COND_B;
4011 case ISD::SETUGE: // flipped
4013 case ISD::SETLE: return X86::COND_BE;
4015 case ISD::SETNE: return X86::COND_NE;
4016 case ISD::SETUO: return X86::COND_P;
4017 case ISD::SETO: return X86::COND_NP;
4019 case ISD::SETUNE: return X86::COND_INVALID;
4023 /// Is there a floating point cmov for the specific X86 condition code?
4024 /// Current x86 isa includes the following FP cmov instructions:
4025 /// fcmovb, fcomvbe, fcomve, fcmovu, fcmovae, fcmova, fcmovne, fcmovnu.
4026 static bool hasFPCMov(unsigned X86CC) {
4042 /// Returns true if the target can instruction select the
4043 /// specified FP immediate natively. If false, the legalizer will
4044 /// materialize the FP immediate as a load from a constant pool.
4045 bool X86TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
4046 for (unsigned i = 0, e = LegalFPImmediates.size(); i != e; ++i) {
4047 if (Imm.bitwiseIsEqual(LegalFPImmediates[i]))
4053 bool X86TargetLowering::shouldReduceLoadWidth(SDNode *Load,
4054 ISD::LoadExtType ExtTy,
4056 // "ELF Handling for Thread-Local Storage" specifies that R_X86_64_GOTTPOFF
4057 // relocation target a movq or addq instruction: don't let the load shrink.
4058 SDValue BasePtr = cast<LoadSDNode>(Load)->getBasePtr();
4059 if (BasePtr.getOpcode() == X86ISD::WrapperRIP)
4060 if (const auto *GA = dyn_cast<GlobalAddressSDNode>(BasePtr.getOperand(0)))
4061 return GA->getTargetFlags() != X86II::MO_GOTTPOFF;
4065 /// \brief Returns true if it is beneficial to convert a load of a constant
4066 /// to just the constant itself.
4067 bool X86TargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
4069 assert(Ty->isIntegerTy());
4071 unsigned BitSize = Ty->getPrimitiveSizeInBits();
4072 if (BitSize == 0 || BitSize > 64)
4077 bool X86TargetLowering::isExtractSubvectorCheap(EVT ResVT,
4078 unsigned Index) const {
4079 if (!isOperationLegalOrCustom(ISD::EXTRACT_SUBVECTOR, ResVT))
4082 return (Index == 0 || Index == ResVT.getVectorNumElements());
4085 bool X86TargetLowering::isCheapToSpeculateCttz() const {
4086 // Speculate cttz only if we can directly use TZCNT.
4087 return Subtarget->hasBMI();
4090 bool X86TargetLowering::isCheapToSpeculateCtlz() const {
4091 // Speculate ctlz only if we can directly use LZCNT.
4092 return Subtarget->hasLZCNT();
4095 /// Return true if every element in Mask, beginning
4096 /// from position Pos and ending in Pos+Size is undef.
4097 static bool isUndefInRange(ArrayRef<int> Mask, unsigned Pos, unsigned Size) {
4098 for (unsigned i = Pos, e = Pos + Size; i != e; ++i)
4104 /// Return true if Val is undef or if its value falls within the
4105 /// specified range (L, H].
4106 static bool isUndefOrInRange(int Val, int Low, int Hi) {
4107 return (Val < 0) || (Val >= Low && Val < Hi);
4110 /// Val is either less than zero (undef) or equal to the specified value.
4111 static bool isUndefOrEqual(int Val, int CmpVal) {
4112 return (Val < 0 || Val == CmpVal);
4115 /// Return true if every element in Mask, beginning
4116 /// from position Pos and ending in Pos+Size, falls within the specified
4117 /// sequential range (Low, Low+Size]. or is undef.
4118 static bool isSequentialOrUndefInRange(ArrayRef<int> Mask,
4119 unsigned Pos, unsigned Size, int Low) {
4120 for (unsigned i = Pos, e = Pos+Size; i != e; ++i, ++Low)
4121 if (!isUndefOrEqual(Mask[i], Low))
4126 /// Return true if the specified EXTRACT_SUBVECTOR operand specifies a vector
4127 /// extract that is suitable for instruction that extract 128 or 256 bit vectors
4128 static bool isVEXTRACTIndex(SDNode *N, unsigned vecWidth) {
4129 assert((vecWidth == 128 || vecWidth == 256) && "Unexpected vector width");
4130 if (!isa<ConstantSDNode>(N->getOperand(1).getNode()))
4133 // The index should be aligned on a vecWidth-bit boundary.
4135 cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
4137 MVT VT = N->getSimpleValueType(0);
4138 unsigned ElSize = VT.getVectorElementType().getSizeInBits();
4139 bool Result = (Index * ElSize) % vecWidth == 0;
4144 /// Return true if the specified INSERT_SUBVECTOR
4145 /// operand specifies a subvector insert that is suitable for input to
4146 /// insertion of 128 or 256-bit subvectors
4147 static bool isVINSERTIndex(SDNode *N, unsigned vecWidth) {
4148 assert((vecWidth == 128 || vecWidth == 256) && "Unexpected vector width");
4149 if (!isa<ConstantSDNode>(N->getOperand(2).getNode()))
4151 // The index should be aligned on a vecWidth-bit boundary.
4153 cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
4155 MVT VT = N->getSimpleValueType(0);
4156 unsigned ElSize = VT.getVectorElementType().getSizeInBits();
4157 bool Result = (Index * ElSize) % vecWidth == 0;
4162 bool X86::isVINSERT128Index(SDNode *N) {
4163 return isVINSERTIndex(N, 128);
4166 bool X86::isVINSERT256Index(SDNode *N) {
4167 return isVINSERTIndex(N, 256);
4170 bool X86::isVEXTRACT128Index(SDNode *N) {
4171 return isVEXTRACTIndex(N, 128);
4174 bool X86::isVEXTRACT256Index(SDNode *N) {
4175 return isVEXTRACTIndex(N, 256);
4178 static unsigned getExtractVEXTRACTImmediate(SDNode *N, unsigned vecWidth) {
4179 assert((vecWidth == 128 || vecWidth == 256) && "Unsupported vector width");
4180 if (!isa<ConstantSDNode>(N->getOperand(1).getNode()))
4181 llvm_unreachable("Illegal extract subvector for VEXTRACT");
4184 cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
4186 MVT VecVT = N->getOperand(0).getSimpleValueType();
4187 MVT ElVT = VecVT.getVectorElementType();
4189 unsigned NumElemsPerChunk = vecWidth / ElVT.getSizeInBits();
4190 return Index / NumElemsPerChunk;
4193 static unsigned getInsertVINSERTImmediate(SDNode *N, unsigned vecWidth) {
4194 assert((vecWidth == 128 || vecWidth == 256) && "Unsupported vector width");
4195 if (!isa<ConstantSDNode>(N->getOperand(2).getNode()))
4196 llvm_unreachable("Illegal insert subvector for VINSERT");
4199 cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
4201 MVT VecVT = N->getSimpleValueType(0);
4202 MVT ElVT = VecVT.getVectorElementType();
4204 unsigned NumElemsPerChunk = vecWidth / ElVT.getSizeInBits();
4205 return Index / NumElemsPerChunk;
4208 /// Return the appropriate immediate to extract the specified
4209 /// EXTRACT_SUBVECTOR index with VEXTRACTF128 and VINSERTI128 instructions.
4210 unsigned X86::getExtractVEXTRACT128Immediate(SDNode *N) {
4211 return getExtractVEXTRACTImmediate(N, 128);
4214 /// Return the appropriate immediate to extract the specified
4215 /// EXTRACT_SUBVECTOR index with VEXTRACTF64x4 and VINSERTI64x4 instructions.
4216 unsigned X86::getExtractVEXTRACT256Immediate(SDNode *N) {
4217 return getExtractVEXTRACTImmediate(N, 256);
4220 /// Return the appropriate immediate to insert at the specified
4221 /// INSERT_SUBVECTOR index with VINSERTF128 and VINSERTI128 instructions.
4222 unsigned X86::getInsertVINSERT128Immediate(SDNode *N) {
4223 return getInsertVINSERTImmediate(N, 128);
4226 /// Return the appropriate immediate to insert at the specified
4227 /// INSERT_SUBVECTOR index with VINSERTF46x4 and VINSERTI64x4 instructions.
4228 unsigned X86::getInsertVINSERT256Immediate(SDNode *N) {
4229 return getInsertVINSERTImmediate(N, 256);
4232 /// Returns true if Elt is a constant integer zero
4233 static bool isZero(SDValue V) {
4234 ConstantSDNode *C = dyn_cast<ConstantSDNode>(V);
4235 return C && C->isNullValue();
4238 /// Returns true if Elt is a constant zero or a floating point constant +0.0.
4239 bool X86::isZeroNode(SDValue Elt) {
4242 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Elt))
4243 return CFP->getValueAPF().isPosZero();
4247 /// Returns a vector of specified type with all zero elements.
4248 static SDValue getZeroVector(EVT VT, const X86Subtarget *Subtarget,
4249 SelectionDAG &DAG, SDLoc dl) {
4250 assert(VT.isVector() && "Expected a vector type");
4252 // Always build SSE zero vectors as <4 x i32> bitcasted
4253 // to their dest type. This ensures they get CSE'd.
4255 if (VT.is128BitVector()) { // SSE
4256 if (Subtarget->hasSSE2()) { // SSE2
4257 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4258 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4260 SDValue Cst = DAG.getConstantFP(+0.0, dl, MVT::f32);
4261 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4f32, Cst, Cst, Cst, Cst);
4263 } else if (VT.is256BitVector()) { // AVX
4264 if (Subtarget->hasInt256()) { // AVX2
4265 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4266 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4267 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops);
4269 // 256-bit logic and arithmetic instructions in AVX are all
4270 // floating-point, no support for integer ops. Emit fp zeroed vectors.
4271 SDValue Cst = DAG.getConstantFP(+0.0, dl, MVT::f32);
4272 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4273 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8f32, Ops);
4275 } else if (VT.is512BitVector()) { // AVX-512
4276 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4277 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst,
4278 Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4279 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i32, Ops);
4280 } else if (VT.getScalarType() == MVT::i1) {
4282 assert((Subtarget->hasBWI() || VT.getVectorNumElements() <= 16)
4283 && "Unexpected vector type");
4284 assert((Subtarget->hasVLX() || VT.getVectorNumElements() >= 8)
4285 && "Unexpected vector type");
4286 SDValue Cst = DAG.getConstant(0, dl, MVT::i1);
4287 SmallVector<SDValue, 64> Ops(VT.getVectorNumElements(), Cst);
4288 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
4290 llvm_unreachable("Unexpected vector type");
4292 return DAG.getBitcast(VT, Vec);
4295 static SDValue ExtractSubVector(SDValue Vec, unsigned IdxVal,
4296 SelectionDAG &DAG, SDLoc dl,
4297 unsigned vectorWidth) {
4298 assert((vectorWidth == 128 || vectorWidth == 256) &&
4299 "Unsupported vector width");
4300 EVT VT = Vec.getValueType();
4301 EVT ElVT = VT.getVectorElementType();
4302 unsigned Factor = VT.getSizeInBits()/vectorWidth;
4303 EVT ResultVT = EVT::getVectorVT(*DAG.getContext(), ElVT,
4304 VT.getVectorNumElements()/Factor);
4306 // Extract from UNDEF is UNDEF.
4307 if (Vec.getOpcode() == ISD::UNDEF)
4308 return DAG.getUNDEF(ResultVT);
4310 // Extract the relevant vectorWidth bits. Generate an EXTRACT_SUBVECTOR
4311 unsigned ElemsPerChunk = vectorWidth / ElVT.getSizeInBits();
4313 // This is the index of the first element of the vectorWidth-bit chunk
4315 unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits()) / vectorWidth)
4318 // If the input is a buildvector just emit a smaller one.
4319 if (Vec.getOpcode() == ISD::BUILD_VECTOR)
4320 return DAG.getNode(ISD::BUILD_VECTOR, dl, ResultVT,
4321 makeArrayRef(Vec->op_begin() + NormalizedIdxVal,
4324 SDValue VecIdx = DAG.getIntPtrConstant(NormalizedIdxVal, dl);
4325 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, ResultVT, Vec, VecIdx);
4328 /// Generate a DAG to grab 128-bits from a vector > 128 bits. This
4329 /// sets things up to match to an AVX VEXTRACTF128 / VEXTRACTI128
4330 /// or AVX-512 VEXTRACTF32x4 / VEXTRACTI32x4
4331 /// instructions or a simple subregister reference. Idx is an index in the
4332 /// 128 bits we want. It need not be aligned to a 128-bit boundary. That makes
4333 /// lowering EXTRACT_VECTOR_ELT operations easier.
4334 static SDValue Extract128BitVector(SDValue Vec, unsigned IdxVal,
4335 SelectionDAG &DAG, SDLoc dl) {
4336 assert((Vec.getValueType().is256BitVector() ||
4337 Vec.getValueType().is512BitVector()) && "Unexpected vector size!");
4338 return ExtractSubVector(Vec, IdxVal, DAG, dl, 128);
4341 /// Generate a DAG to grab 256-bits from a 512-bit vector.
4342 static SDValue Extract256BitVector(SDValue Vec, unsigned IdxVal,
4343 SelectionDAG &DAG, SDLoc dl) {
4344 assert(Vec.getValueType().is512BitVector() && "Unexpected vector size!");
4345 return ExtractSubVector(Vec, IdxVal, DAG, dl, 256);
4348 static SDValue InsertSubVector(SDValue Result, SDValue Vec,
4349 unsigned IdxVal, SelectionDAG &DAG,
4350 SDLoc dl, unsigned vectorWidth) {
4351 assert((vectorWidth == 128 || vectorWidth == 256) &&
4352 "Unsupported vector width");
4353 // Inserting UNDEF is Result
4354 if (Vec.getOpcode() == ISD::UNDEF)
4356 EVT VT = Vec.getValueType();
4357 EVT ElVT = VT.getVectorElementType();
4358 EVT ResultVT = Result.getValueType();
4360 // Insert the relevant vectorWidth bits.
4361 unsigned ElemsPerChunk = vectorWidth/ElVT.getSizeInBits();
4363 // This is the index of the first element of the vectorWidth-bit chunk
4365 unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits())/vectorWidth)
4368 SDValue VecIdx = DAG.getIntPtrConstant(NormalizedIdxVal, dl);
4369 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Result, Vec, VecIdx);
4372 /// Generate a DAG to put 128-bits into a vector > 128 bits. This
4373 /// sets things up to match to an AVX VINSERTF128/VINSERTI128 or
4374 /// AVX-512 VINSERTF32x4/VINSERTI32x4 instructions or a
4375 /// simple superregister reference. Idx is an index in the 128 bits
4376 /// we want. It need not be aligned to a 128-bit boundary. That makes
4377 /// lowering INSERT_VECTOR_ELT operations easier.
4378 static SDValue Insert128BitVector(SDValue Result, SDValue Vec, unsigned IdxVal,
4379 SelectionDAG &DAG, SDLoc dl) {
4380 assert(Vec.getValueType().is128BitVector() && "Unexpected vector size!");
4382 // For insertion into the zero index (low half) of a 256-bit vector, it is
4383 // more efficient to generate a blend with immediate instead of an insert*128.
4384 // We are still creating an INSERT_SUBVECTOR below with an undef node to
4385 // extend the subvector to the size of the result vector. Make sure that
4386 // we are not recursing on that node by checking for undef here.
4387 if (IdxVal == 0 && Result.getValueType().is256BitVector() &&
4388 Result.getOpcode() != ISD::UNDEF) {
4389 EVT ResultVT = Result.getValueType();
4390 SDValue ZeroIndex = DAG.getIntPtrConstant(0, dl);
4391 SDValue Undef = DAG.getUNDEF(ResultVT);
4392 SDValue Vec256 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Undef,
4395 // The blend instruction, and therefore its mask, depend on the data type.
4396 MVT ScalarType = ResultVT.getScalarType().getSimpleVT();
4397 if (ScalarType.isFloatingPoint()) {
4398 // Choose either vblendps (float) or vblendpd (double).
4399 unsigned ScalarSize = ScalarType.getSizeInBits();
4400 assert((ScalarSize == 64 || ScalarSize == 32) && "Unknown float type");
4401 unsigned MaskVal = (ScalarSize == 64) ? 0x03 : 0x0f;
4402 SDValue Mask = DAG.getConstant(MaskVal, dl, MVT::i8);
4403 return DAG.getNode(X86ISD::BLENDI, dl, ResultVT, Result, Vec256, Mask);
4406 const X86Subtarget &Subtarget =
4407 static_cast<const X86Subtarget &>(DAG.getSubtarget());
4409 // AVX2 is needed for 256-bit integer blend support.
4410 // Integers must be cast to 32-bit because there is only vpblendd;
4411 // vpblendw can't be used for this because it has a handicapped mask.
4413 // If we don't have AVX2, then cast to float. Using a wrong domain blend
4414 // is still more efficient than using the wrong domain vinsertf128 that
4415 // will be created by InsertSubVector().
4416 MVT CastVT = Subtarget.hasAVX2() ? MVT::v8i32 : MVT::v8f32;
4418 SDValue Mask = DAG.getConstant(0x0f, dl, MVT::i8);
4419 Vec256 = DAG.getBitcast(CastVT, Vec256);
4420 Vec256 = DAG.getNode(X86ISD::BLENDI, dl, CastVT, Result, Vec256, Mask);
4421 return DAG.getBitcast(ResultVT, Vec256);
4424 return InsertSubVector(Result, Vec, IdxVal, DAG, dl, 128);
4427 static SDValue Insert256BitVector(SDValue Result, SDValue Vec, unsigned IdxVal,
4428 SelectionDAG &DAG, SDLoc dl) {
4429 assert(Vec.getValueType().is256BitVector() && "Unexpected vector size!");
4430 return InsertSubVector(Result, Vec, IdxVal, DAG, dl, 256);
4433 /// Concat two 128-bit vectors into a 256 bit vector using VINSERTF128
4434 /// instructions. This is used because creating CONCAT_VECTOR nodes of
4435 /// BUILD_VECTORS returns a larger BUILD_VECTOR while we're trying to lower
4436 /// large BUILD_VECTORS.
4437 static SDValue Concat128BitVectors(SDValue V1, SDValue V2, EVT VT,
4438 unsigned NumElems, SelectionDAG &DAG,
4440 SDValue V = Insert128BitVector(DAG.getUNDEF(VT), V1, 0, DAG, dl);
4441 return Insert128BitVector(V, V2, NumElems/2, DAG, dl);
4444 static SDValue Concat256BitVectors(SDValue V1, SDValue V2, EVT VT,
4445 unsigned NumElems, SelectionDAG &DAG,
4447 SDValue V = Insert256BitVector(DAG.getUNDEF(VT), V1, 0, DAG, dl);
4448 return Insert256BitVector(V, V2, NumElems/2, DAG, dl);
4451 /// Returns a vector of specified type with all bits set.
4452 /// Always build ones vectors as <4 x i32> or <8 x i32>. For 256-bit types with
4453 /// no AVX2 supprt, use two <4 x i32> inserted in a <8 x i32> appropriately.
4454 /// Then bitcast to their original type, ensuring they get CSE'd.
4455 static SDValue getOnesVector(EVT VT, const X86Subtarget *Subtarget,
4456 SelectionDAG &DAG, SDLoc dl) {
4457 assert(VT.isVector() && "Expected a vector type");
4459 SDValue Cst = DAG.getConstant(~0U, dl, MVT::i32);
4461 if (VT.is512BitVector()) {
4462 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst,
4463 Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4464 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i32, Ops);
4465 } else if (VT.is256BitVector()) {
4466 if (Subtarget->hasInt256()) { // AVX2
4467 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4468 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops);
4470 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4471 Vec = Concat128BitVectors(Vec, Vec, MVT::v8i32, 8, DAG, dl);
4473 } else if (VT.is128BitVector()) {
4474 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4476 llvm_unreachable("Unexpected vector type");
4478 return DAG.getBitcast(VT, Vec);
4481 /// Returns a vector_shuffle node for an unpackl operation.
4482 static SDValue getUnpackl(SelectionDAG &DAG, SDLoc dl, MVT VT, SDValue V1,
4484 unsigned NumElems = VT.getVectorNumElements();
4485 SmallVector<int, 8> Mask;
4486 for (unsigned i = 0, e = NumElems/2; i != e; ++i) {
4488 Mask.push_back(i + NumElems);
4490 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
4493 /// Returns a vector_shuffle node for an unpackh operation.
4494 static SDValue getUnpackh(SelectionDAG &DAG, SDLoc dl, MVT VT, SDValue V1,
4496 unsigned NumElems = VT.getVectorNumElements();
4497 SmallVector<int, 8> Mask;
4498 for (unsigned i = 0, Half = NumElems/2; i != Half; ++i) {
4499 Mask.push_back(i + Half);
4500 Mask.push_back(i + NumElems + Half);
4502 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
4505 /// Return a vector_shuffle of the specified vector of zero or undef vector.
4506 /// This produces a shuffle where the low element of V2 is swizzled into the
4507 /// zero/undef vector, landing at element Idx.
4508 /// This produces a shuffle mask like 4,1,2,3 (idx=0) or 0,1,2,4 (idx=3).
4509 static SDValue getShuffleVectorZeroOrUndef(SDValue V2, unsigned Idx,
4511 const X86Subtarget *Subtarget,
4512 SelectionDAG &DAG) {
4513 MVT VT = V2.getSimpleValueType();
4515 ? getZeroVector(VT, Subtarget, DAG, SDLoc(V2)) : DAG.getUNDEF(VT);
4516 unsigned NumElems = VT.getVectorNumElements();
4517 SmallVector<int, 16> MaskVec;
4518 for (unsigned i = 0; i != NumElems; ++i)
4519 // If this is the insertion idx, put the low elt of V2 here.
4520 MaskVec.push_back(i == Idx ? NumElems : i);
4521 return DAG.getVectorShuffle(VT, SDLoc(V2), V1, V2, &MaskVec[0]);
4524 /// Calculates the shuffle mask corresponding to the target-specific opcode.
4525 /// Returns true if the Mask could be calculated. Sets IsUnary to true if only
4526 /// uses one source. Note that this will set IsUnary for shuffles which use a
4527 /// single input multiple times, and in those cases it will
4528 /// adjust the mask to only have indices within that single input.
4529 /// FIXME: Add support for Decode*Mask functions that return SM_SentinelZero.
4530 static bool getTargetShuffleMask(SDNode *N, MVT VT,
4531 SmallVectorImpl<int> &Mask, bool &IsUnary) {
4532 unsigned NumElems = VT.getVectorNumElements();
4536 bool IsFakeUnary = false;
4537 switch(N->getOpcode()) {
4538 case X86ISD::BLENDI:
4539 ImmN = N->getOperand(N->getNumOperands()-1);
4540 DecodeBLENDMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4543 ImmN = N->getOperand(N->getNumOperands()-1);
4544 DecodeSHUFPMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4545 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4547 case X86ISD::UNPCKH:
4548 DecodeUNPCKHMask(VT, Mask);
4549 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4551 case X86ISD::UNPCKL:
4552 DecodeUNPCKLMask(VT, Mask);
4553 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4555 case X86ISD::MOVHLPS:
4556 DecodeMOVHLPSMask(NumElems, Mask);
4557 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4559 case X86ISD::MOVLHPS:
4560 DecodeMOVLHPSMask(NumElems, Mask);
4561 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4563 case X86ISD::PALIGNR:
4564 ImmN = N->getOperand(N->getNumOperands()-1);
4565 DecodePALIGNRMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4567 case X86ISD::PSHUFD:
4568 case X86ISD::VPERMILPI:
4569 ImmN = N->getOperand(N->getNumOperands()-1);
4570 DecodePSHUFMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4573 case X86ISD::PSHUFHW:
4574 ImmN = N->getOperand(N->getNumOperands()-1);
4575 DecodePSHUFHWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4578 case X86ISD::PSHUFLW:
4579 ImmN = N->getOperand(N->getNumOperands()-1);
4580 DecodePSHUFLWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4583 case X86ISD::PSHUFB: {
4585 SDValue MaskNode = N->getOperand(1);
4586 while (MaskNode->getOpcode() == ISD::BITCAST)
4587 MaskNode = MaskNode->getOperand(0);
4589 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4590 // If we have a build-vector, then things are easy.
4591 EVT VT = MaskNode.getValueType();
4592 assert(VT.isVector() &&
4593 "Can't produce a non-vector with a build_vector!");
4594 if (!VT.isInteger())
4597 int NumBytesPerElement = VT.getVectorElementType().getSizeInBits() / 8;
4599 SmallVector<uint64_t, 32> RawMask;
4600 for (int i = 0, e = MaskNode->getNumOperands(); i < e; ++i) {
4601 SDValue Op = MaskNode->getOperand(i);
4602 if (Op->getOpcode() == ISD::UNDEF) {
4603 RawMask.push_back((uint64_t)SM_SentinelUndef);
4606 auto *CN = dyn_cast<ConstantSDNode>(Op.getNode());
4609 APInt MaskElement = CN->getAPIntValue();
4611 // We now have to decode the element which could be any integer size and
4612 // extract each byte of it.
4613 for (int j = 0; j < NumBytesPerElement; ++j) {
4614 // Note that this is x86 and so always little endian: the low byte is
4615 // the first byte of the mask.
4616 RawMask.push_back(MaskElement.getLoBits(8).getZExtValue());
4617 MaskElement = MaskElement.lshr(8);
4620 DecodePSHUFBMask(RawMask, Mask);
4624 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4628 SDValue Ptr = MaskLoad->getBasePtr();
4629 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4630 Ptr->getOpcode() == X86ISD::WrapperRIP)
4631 Ptr = Ptr->getOperand(0);
4633 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4634 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4637 if (auto *C = dyn_cast<Constant>(MaskCP->getConstVal())) {
4638 DecodePSHUFBMask(C, Mask);
4646 case X86ISD::VPERMI:
4647 ImmN = N->getOperand(N->getNumOperands()-1);
4648 DecodeVPERMMask(cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4653 DecodeScalarMoveMask(VT, /* IsLoad */ false, Mask);
4655 case X86ISD::VPERM2X128:
4656 ImmN = N->getOperand(N->getNumOperands()-1);
4657 DecodeVPERM2X128Mask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4658 if (Mask.empty()) return false;
4659 // Mask only contains negative index if an element is zero.
4660 if (std::any_of(Mask.begin(), Mask.end(),
4661 [](int M){ return M == SM_SentinelZero; }))
4664 case X86ISD::MOVSLDUP:
4665 DecodeMOVSLDUPMask(VT, Mask);
4668 case X86ISD::MOVSHDUP:
4669 DecodeMOVSHDUPMask(VT, Mask);
4672 case X86ISD::MOVDDUP:
4673 DecodeMOVDDUPMask(VT, Mask);
4676 case X86ISD::MOVLHPD:
4677 case X86ISD::MOVLPD:
4678 case X86ISD::MOVLPS:
4679 // Not yet implemented
4681 case X86ISD::VPERMV: {
4683 SDValue MaskNode = N->getOperand(0);
4684 while (MaskNode->getOpcode() == ISD::BITCAST)
4685 MaskNode = MaskNode->getOperand(0);
4687 unsigned MaskLoBits = Log2_64(VT.getVectorNumElements());
4688 SmallVector<uint64_t, 32> RawMask;
4689 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4690 // If we have a build-vector, then things are easy.
4691 assert(MaskNode.getValueType().isInteger() &&
4692 MaskNode.getValueType().getVectorNumElements() ==
4693 VT.getVectorNumElements());
4695 for (unsigned i = 0; i < MaskNode->getNumOperands(); ++i) {
4696 SDValue Op = MaskNode->getOperand(i);
4697 if (Op->getOpcode() == ISD::UNDEF)
4698 RawMask.push_back((uint64_t)SM_SentinelUndef);
4699 else if (isa<ConstantSDNode>(Op)) {
4700 APInt MaskElement = cast<ConstantSDNode>(Op)->getAPIntValue();
4701 RawMask.push_back(MaskElement.getLoBits(MaskLoBits).getZExtValue());
4705 DecodeVPERMVMask(RawMask, Mask);
4708 if (MaskNode->getOpcode() == X86ISD::VBROADCAST) {
4709 unsigned NumEltsInMask = MaskNode->getNumOperands();
4710 MaskNode = MaskNode->getOperand(0);
4711 auto *CN = dyn_cast<ConstantSDNode>(MaskNode);
4713 APInt MaskEltValue = CN->getAPIntValue();
4714 for (unsigned i = 0; i < NumEltsInMask; ++i)
4715 RawMask.push_back(MaskEltValue.getLoBits(MaskLoBits).getZExtValue());
4716 DecodeVPERMVMask(RawMask, Mask);
4719 // It may be a scalar load
4722 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4726 SDValue Ptr = MaskLoad->getBasePtr();
4727 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4728 Ptr->getOpcode() == X86ISD::WrapperRIP)
4729 Ptr = Ptr->getOperand(0);
4731 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4732 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4735 auto *C = dyn_cast<Constant>(MaskCP->getConstVal());
4737 DecodeVPERMVMask(C, VT, Mask);
4744 case X86ISD::VPERMV3: {
4746 SDValue MaskNode = N->getOperand(1);
4747 while (MaskNode->getOpcode() == ISD::BITCAST)
4748 MaskNode = MaskNode->getOperand(1);
4750 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4751 // If we have a build-vector, then things are easy.
4752 assert(MaskNode.getValueType().isInteger() &&
4753 MaskNode.getValueType().getVectorNumElements() ==
4754 VT.getVectorNumElements());
4756 SmallVector<uint64_t, 32> RawMask;
4757 unsigned MaskLoBits = Log2_64(VT.getVectorNumElements()*2);
4759 for (unsigned i = 0; i < MaskNode->getNumOperands(); ++i) {
4760 SDValue Op = MaskNode->getOperand(i);
4761 if (Op->getOpcode() == ISD::UNDEF)
4762 RawMask.push_back((uint64_t)SM_SentinelUndef);
4764 auto *CN = dyn_cast<ConstantSDNode>(Op.getNode());
4767 APInt MaskElement = CN->getAPIntValue();
4768 RawMask.push_back(MaskElement.getLoBits(MaskLoBits).getZExtValue());
4771 DecodeVPERMV3Mask(RawMask, Mask);
4775 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4779 SDValue Ptr = MaskLoad->getBasePtr();
4780 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4781 Ptr->getOpcode() == X86ISD::WrapperRIP)
4782 Ptr = Ptr->getOperand(0);
4784 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4785 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4788 auto *C = dyn_cast<Constant>(MaskCP->getConstVal());
4790 DecodeVPERMV3Mask(C, VT, Mask);
4797 default: llvm_unreachable("unknown target shuffle node");
4800 // If we have a fake unary shuffle, the shuffle mask is spread across two
4801 // inputs that are actually the same node. Re-map the mask to always point
4802 // into the first input.
4805 if (M >= (int)Mask.size())
4811 /// Returns the scalar element that will make up the ith
4812 /// element of the result of the vector shuffle.
4813 static SDValue getShuffleScalarElt(SDNode *N, unsigned Index, SelectionDAG &DAG,
4816 return SDValue(); // Limit search depth.
4818 SDValue V = SDValue(N, 0);
4819 EVT VT = V.getValueType();
4820 unsigned Opcode = V.getOpcode();
4822 // Recurse into ISD::VECTOR_SHUFFLE node to find scalars.
4823 if (const ShuffleVectorSDNode *SV = dyn_cast<ShuffleVectorSDNode>(N)) {
4824 int Elt = SV->getMaskElt(Index);
4827 return DAG.getUNDEF(VT.getVectorElementType());
4829 unsigned NumElems = VT.getVectorNumElements();
4830 SDValue NewV = (Elt < (int)NumElems) ? SV->getOperand(0)
4831 : SV->getOperand(1);
4832 return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG, Depth+1);
4835 // Recurse into target specific vector shuffles to find scalars.
4836 if (isTargetShuffle(Opcode)) {
4837 MVT ShufVT = V.getSimpleValueType();
4838 unsigned NumElems = ShufVT.getVectorNumElements();
4839 SmallVector<int, 16> ShuffleMask;
4842 if (!getTargetShuffleMask(N, ShufVT, ShuffleMask, IsUnary))
4845 int Elt = ShuffleMask[Index];
4847 return DAG.getUNDEF(ShufVT.getVectorElementType());
4849 SDValue NewV = (Elt < (int)NumElems) ? N->getOperand(0)
4851 return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG,
4855 // Actual nodes that may contain scalar elements
4856 if (Opcode == ISD::BITCAST) {
4857 V = V.getOperand(0);
4858 EVT SrcVT = V.getValueType();
4859 unsigned NumElems = VT.getVectorNumElements();
4861 if (!SrcVT.isVector() || SrcVT.getVectorNumElements() != NumElems)
4865 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
4866 return (Index == 0) ? V.getOperand(0)
4867 : DAG.getUNDEF(VT.getVectorElementType());
4869 if (V.getOpcode() == ISD::BUILD_VECTOR)
4870 return V.getOperand(Index);
4875 /// Custom lower build_vector of v16i8.
4876 static SDValue LowerBuildVectorv16i8(SDValue Op, unsigned NonZeros,
4877 unsigned NumNonZero, unsigned NumZero,
4879 const X86Subtarget* Subtarget,
4880 const TargetLowering &TLI) {
4888 // SSE4.1 - use PINSRB to insert each byte directly.
4889 if (Subtarget->hasSSE41()) {
4890 for (unsigned i = 0; i < 16; ++i) {
4891 bool isNonZero = (NonZeros & (1 << i)) != 0;
4895 V = getZeroVector(MVT::v16i8, Subtarget, DAG, dl);
4897 V = DAG.getUNDEF(MVT::v16i8);
4900 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl,
4901 MVT::v16i8, V, Op.getOperand(i),
4902 DAG.getIntPtrConstant(i, dl));
4909 // Pre-SSE4.1 - merge byte pairs and insert with PINSRW.
4910 for (unsigned i = 0; i < 16; ++i) {
4911 bool ThisIsNonZero = (NonZeros & (1 << i)) != 0;
4912 if (ThisIsNonZero && First) {
4914 V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
4916 V = DAG.getUNDEF(MVT::v8i16);
4921 SDValue ThisElt, LastElt;
4922 bool LastIsNonZero = (NonZeros & (1 << (i-1))) != 0;
4923 if (LastIsNonZero) {
4924 LastElt = DAG.getNode(ISD::ZERO_EXTEND, dl,
4925 MVT::i16, Op.getOperand(i-1));
4927 if (ThisIsNonZero) {
4928 ThisElt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i16, Op.getOperand(i));
4929 ThisElt = DAG.getNode(ISD::SHL, dl, MVT::i16,
4930 ThisElt, DAG.getConstant(8, dl, MVT::i8));
4932 ThisElt = DAG.getNode(ISD::OR, dl, MVT::i16, ThisElt, LastElt);
4936 if (ThisElt.getNode())
4937 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, V, ThisElt,
4938 DAG.getIntPtrConstant(i/2, dl));
4942 return DAG.getBitcast(MVT::v16i8, V);
4945 /// Custom lower build_vector of v8i16.
4946 static SDValue LowerBuildVectorv8i16(SDValue Op, unsigned NonZeros,
4947 unsigned NumNonZero, unsigned NumZero,
4949 const X86Subtarget* Subtarget,
4950 const TargetLowering &TLI) {
4957 for (unsigned i = 0; i < 8; ++i) {
4958 bool isNonZero = (NonZeros & (1 << i)) != 0;
4962 V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
4964 V = DAG.getUNDEF(MVT::v8i16);
4967 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl,
4968 MVT::v8i16, V, Op.getOperand(i),
4969 DAG.getIntPtrConstant(i, dl));
4976 /// Custom lower build_vector of v4i32 or v4f32.
4977 static SDValue LowerBuildVectorv4x32(SDValue Op, SelectionDAG &DAG,
4978 const X86Subtarget *Subtarget,
4979 const TargetLowering &TLI) {
4980 // Find all zeroable elements.
4981 std::bitset<4> Zeroable;
4982 for (int i=0; i < 4; ++i) {
4983 SDValue Elt = Op->getOperand(i);
4984 Zeroable[i] = (Elt.getOpcode() == ISD::UNDEF || X86::isZeroNode(Elt));
4986 assert(Zeroable.size() - Zeroable.count() > 1 &&
4987 "We expect at least two non-zero elements!");
4989 // We only know how to deal with build_vector nodes where elements are either
4990 // zeroable or extract_vector_elt with constant index.
4991 SDValue FirstNonZero;
4992 unsigned FirstNonZeroIdx;
4993 for (unsigned i=0; i < 4; ++i) {
4996 SDValue Elt = Op->getOperand(i);
4997 if (Elt.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
4998 !isa<ConstantSDNode>(Elt.getOperand(1)))
5000 // Make sure that this node is extracting from a 128-bit vector.
5001 MVT VT = Elt.getOperand(0).getSimpleValueType();
5002 if (!VT.is128BitVector())
5004 if (!FirstNonZero.getNode()) {
5006 FirstNonZeroIdx = i;
5010 assert(FirstNonZero.getNode() && "Unexpected build vector of all zeros!");
5011 SDValue V1 = FirstNonZero.getOperand(0);
5012 MVT VT = V1.getSimpleValueType();
5014 // See if this build_vector can be lowered as a blend with zero.
5016 unsigned EltMaskIdx, EltIdx;
5018 for (EltIdx = 0; EltIdx < 4; ++EltIdx) {
5019 if (Zeroable[EltIdx]) {
5020 // The zero vector will be on the right hand side.
5021 Mask[EltIdx] = EltIdx+4;
5025 Elt = Op->getOperand(EltIdx);
5026 // By construction, Elt is a EXTRACT_VECTOR_ELT with constant index.
5027 EltMaskIdx = cast<ConstantSDNode>(Elt.getOperand(1))->getZExtValue();
5028 if (Elt.getOperand(0) != V1 || EltMaskIdx != EltIdx)
5030 Mask[EltIdx] = EltIdx;
5034 // Let the shuffle legalizer deal with blend operations.
5035 SDValue VZero = getZeroVector(VT, Subtarget, DAG, SDLoc(Op));
5036 if (V1.getSimpleValueType() != VT)
5037 V1 = DAG.getNode(ISD::BITCAST, SDLoc(V1), VT, V1);
5038 return DAG.getVectorShuffle(VT, SDLoc(V1), V1, VZero, &Mask[0]);
5041 // See if we can lower this build_vector to a INSERTPS.
5042 if (!Subtarget->hasSSE41())
5045 SDValue V2 = Elt.getOperand(0);
5046 if (Elt == FirstNonZero && EltIdx == FirstNonZeroIdx)
5049 bool CanFold = true;
5050 for (unsigned i = EltIdx + 1; i < 4 && CanFold; ++i) {
5054 SDValue Current = Op->getOperand(i);
5055 SDValue SrcVector = Current->getOperand(0);
5058 CanFold = SrcVector == V1 &&
5059 cast<ConstantSDNode>(Current.getOperand(1))->getZExtValue() == i;
5065 assert(V1.getNode() && "Expected at least two non-zero elements!");
5066 if (V1.getSimpleValueType() != MVT::v4f32)
5067 V1 = DAG.getNode(ISD::BITCAST, SDLoc(V1), MVT::v4f32, V1);
5068 if (V2.getSimpleValueType() != MVT::v4f32)
5069 V2 = DAG.getNode(ISD::BITCAST, SDLoc(V2), MVT::v4f32, V2);
5071 // Ok, we can emit an INSERTPS instruction.
5072 unsigned ZMask = Zeroable.to_ulong();
5074 unsigned InsertPSMask = EltMaskIdx << 6 | EltIdx << 4 | ZMask;
5075 assert((InsertPSMask & ~0xFFu) == 0 && "Invalid mask!");
5077 SDValue Result = DAG.getNode(X86ISD::INSERTPS, DL, MVT::v4f32, V1, V2,
5078 DAG.getIntPtrConstant(InsertPSMask, DL));
5079 return DAG.getBitcast(VT, Result);
5082 /// Return a vector logical shift node.
5083 static SDValue getVShift(bool isLeft, EVT VT, SDValue SrcOp,
5084 unsigned NumBits, SelectionDAG &DAG,
5085 const TargetLowering &TLI, SDLoc dl) {
5086 assert(VT.is128BitVector() && "Unknown type for VShift");
5087 MVT ShVT = MVT::v2i64;
5088 unsigned Opc = isLeft ? X86ISD::VSHLDQ : X86ISD::VSRLDQ;
5089 SrcOp = DAG.getBitcast(ShVT, SrcOp);
5090 MVT ScalarShiftTy = TLI.getScalarShiftAmountTy(DAG.getDataLayout(), VT);
5091 assert(NumBits % 8 == 0 && "Only support byte sized shifts");
5092 SDValue ShiftVal = DAG.getConstant(NumBits/8, dl, ScalarShiftTy);
5093 return DAG.getBitcast(VT, DAG.getNode(Opc, dl, ShVT, SrcOp, ShiftVal));
5097 LowerAsSplatVectorLoad(SDValue SrcOp, MVT VT, SDLoc dl, SelectionDAG &DAG) {
5099 // Check if the scalar load can be widened into a vector load. And if
5100 // the address is "base + cst" see if the cst can be "absorbed" into
5101 // the shuffle mask.
5102 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(SrcOp)) {
5103 SDValue Ptr = LD->getBasePtr();
5104 if (!ISD::isNormalLoad(LD) || LD->isVolatile())
5106 EVT PVT = LD->getValueType(0);
5107 if (PVT != MVT::i32 && PVT != MVT::f32)
5112 if (FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr)) {
5113 FI = FINode->getIndex();
5115 } else if (DAG.isBaseWithConstantOffset(Ptr) &&
5116 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
5117 FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
5118 Offset = Ptr.getConstantOperandVal(1);
5119 Ptr = Ptr.getOperand(0);
5124 // FIXME: 256-bit vector instructions don't require a strict alignment,
5125 // improve this code to support it better.
5126 unsigned RequiredAlign = VT.getSizeInBits()/8;
5127 SDValue Chain = LD->getChain();
5128 // Make sure the stack object alignment is at least 16 or 32.
5129 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
5130 if (DAG.InferPtrAlignment(Ptr) < RequiredAlign) {
5131 if (MFI->isFixedObjectIndex(FI)) {
5132 // Can't change the alignment. FIXME: It's possible to compute
5133 // the exact stack offset and reference FI + adjust offset instead.
5134 // If someone *really* cares about this. That's the way to implement it.
5137 MFI->setObjectAlignment(FI, RequiredAlign);
5141 // (Offset % 16 or 32) must be multiple of 4. Then address is then
5142 // Ptr + (Offset & ~15).
5145 if ((Offset % RequiredAlign) & 3)
5147 int64_t StartOffset = Offset & ~int64_t(RequiredAlign - 1);
5150 Ptr = DAG.getNode(ISD::ADD, DL, Ptr.getValueType(), Ptr,
5151 DAG.getConstant(StartOffset, DL, Ptr.getValueType()));
5154 int EltNo = (Offset - StartOffset) >> 2;
5155 unsigned NumElems = VT.getVectorNumElements();
5157 EVT NVT = EVT::getVectorVT(*DAG.getContext(), PVT, NumElems);
5158 SDValue V1 = DAG.getLoad(NVT, dl, Chain, Ptr,
5159 LD->getPointerInfo().getWithOffset(StartOffset),
5160 false, false, false, 0);
5162 SmallVector<int, 8> Mask(NumElems, EltNo);
5164 return DAG.getVectorShuffle(NVT, dl, V1, DAG.getUNDEF(NVT), &Mask[0]);
5170 /// Given the initializing elements 'Elts' of a vector of type 'VT', see if the
5171 /// elements can be replaced by a single large load which has the same value as
5172 /// a build_vector or insert_subvector whose loaded operands are 'Elts'.
5174 /// Example: <load i32 *a, load i32 *a+4, undef, undef> -> zextload a
5176 /// FIXME: we'd also like to handle the case where the last elements are zero
5177 /// rather than undef via VZEXT_LOAD, but we do not detect that case today.
5178 /// There's even a handy isZeroNode for that purpose.
5179 static SDValue EltsFromConsecutiveLoads(EVT VT, ArrayRef<SDValue> Elts,
5180 SDLoc &DL, SelectionDAG &DAG,
5181 bool isAfterLegalize) {
5182 unsigned NumElems = Elts.size();
5184 LoadSDNode *LDBase = nullptr;
5185 unsigned LastLoadedElt = -1U;
5187 // For each element in the initializer, see if we've found a load or an undef.
5188 // If we don't find an initial load element, or later load elements are
5189 // non-consecutive, bail out.
5190 for (unsigned i = 0; i < NumElems; ++i) {
5191 SDValue Elt = Elts[i];
5192 // Look through a bitcast.
5193 if (Elt.getNode() && Elt.getOpcode() == ISD::BITCAST)
5194 Elt = Elt.getOperand(0);
5195 if (!Elt.getNode() ||
5196 (Elt.getOpcode() != ISD::UNDEF && !ISD::isNON_EXTLoad(Elt.getNode())))
5199 if (Elt.getNode()->getOpcode() == ISD::UNDEF)
5201 LDBase = cast<LoadSDNode>(Elt.getNode());
5205 if (Elt.getOpcode() == ISD::UNDEF)
5208 LoadSDNode *LD = cast<LoadSDNode>(Elt);
5209 EVT LdVT = Elt.getValueType();
5210 // Each loaded element must be the correct fractional portion of the
5211 // requested vector load.
5212 if (LdVT.getSizeInBits() != VT.getSizeInBits() / NumElems)
5214 if (!DAG.isConsecutiveLoad(LD, LDBase, LdVT.getSizeInBits() / 8, i))
5219 // If we have found an entire vector of loads and undefs, then return a large
5220 // load of the entire vector width starting at the base pointer. If we found
5221 // consecutive loads for the low half, generate a vzext_load node.
5222 if (LastLoadedElt == NumElems - 1) {
5223 assert(LDBase && "Did not find base load for merging consecutive loads");
5224 EVT EltVT = LDBase->getValueType(0);
5225 // Ensure that the input vector size for the merged loads matches the
5226 // cumulative size of the input elements.
5227 if (VT.getSizeInBits() != EltVT.getSizeInBits() * NumElems)
5230 if (isAfterLegalize &&
5231 !DAG.getTargetLoweringInfo().isOperationLegal(ISD::LOAD, VT))
5234 SDValue NewLd = SDValue();
5236 NewLd = DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
5237 LDBase->getPointerInfo(), LDBase->isVolatile(),
5238 LDBase->isNonTemporal(), LDBase->isInvariant(),
5239 LDBase->getAlignment());
5241 if (LDBase->hasAnyUseOfValue(1)) {
5242 SDValue NewChain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
5244 SDValue(NewLd.getNode(), 1));
5245 DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
5246 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
5247 SDValue(NewLd.getNode(), 1));
5253 //TODO: The code below fires only for for loading the low v2i32 / v2f32
5254 //of a v4i32 / v4f32. It's probably worth generalizing.
5255 EVT EltVT = VT.getVectorElementType();
5256 if (NumElems == 4 && LastLoadedElt == 1 && (EltVT.getSizeInBits() == 32) &&
5257 DAG.getTargetLoweringInfo().isTypeLegal(MVT::v2i64)) {
5258 SDVTList Tys = DAG.getVTList(MVT::v2i64, MVT::Other);
5259 SDValue Ops[] = { LDBase->getChain(), LDBase->getBasePtr() };
5261 DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, DL, Tys, Ops, MVT::i64,
5262 LDBase->getPointerInfo(),
5263 LDBase->getAlignment(),
5264 false/*isVolatile*/, true/*ReadMem*/,
5267 // Make sure the newly-created LOAD is in the same position as LDBase in
5268 // terms of dependency. We create a TokenFactor for LDBase and ResNode, and
5269 // update uses of LDBase's output chain to use the TokenFactor.
5270 if (LDBase->hasAnyUseOfValue(1)) {
5271 SDValue NewChain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
5272 SDValue(LDBase, 1), SDValue(ResNode.getNode(), 1));
5273 DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
5274 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
5275 SDValue(ResNode.getNode(), 1));
5278 return DAG.getBitcast(VT, ResNode);
5283 /// LowerVectorBroadcast - Attempt to use the vbroadcast instruction
5284 /// to generate a splat value for the following cases:
5285 /// 1. A splat BUILD_VECTOR which uses a single scalar load, or a constant.
5286 /// 2. A splat shuffle which uses a scalar_to_vector node which comes from
5287 /// a scalar load, or a constant.
5288 /// The VBROADCAST node is returned when a pattern is found,
5289 /// or SDValue() otherwise.
5290 static SDValue LowerVectorBroadcast(SDValue Op, const X86Subtarget* Subtarget,
5291 SelectionDAG &DAG) {
5292 // VBROADCAST requires AVX.
5293 // TODO: Splats could be generated for non-AVX CPUs using SSE
5294 // instructions, but there's less potential gain for only 128-bit vectors.
5295 if (!Subtarget->hasAVX())
5298 MVT VT = Op.getSimpleValueType();
5301 assert((VT.is128BitVector() || VT.is256BitVector() || VT.is512BitVector()) &&
5302 "Unsupported vector type for broadcast.");
5307 switch (Op.getOpcode()) {
5309 // Unknown pattern found.
5312 case ISD::BUILD_VECTOR: {
5313 auto *BVOp = cast<BuildVectorSDNode>(Op.getNode());
5314 BitVector UndefElements;
5315 SDValue Splat = BVOp->getSplatValue(&UndefElements);
5317 // We need a splat of a single value to use broadcast, and it doesn't
5318 // make any sense if the value is only in one element of the vector.
5319 if (!Splat || (VT.getVectorNumElements() - UndefElements.count()) <= 1)
5323 ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
5324 Ld.getOpcode() == ISD::ConstantFP);
5326 // Make sure that all of the users of a non-constant load are from the
5327 // BUILD_VECTOR node.
5328 if (!ConstSplatVal && !BVOp->isOnlyUserOf(Ld.getNode()))
5333 case ISD::VECTOR_SHUFFLE: {
5334 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
5336 // Shuffles must have a splat mask where the first element is
5338 if ((!SVOp->isSplat()) || SVOp->getMaskElt(0) != 0)
5341 SDValue Sc = Op.getOperand(0);
5342 if (Sc.getOpcode() != ISD::SCALAR_TO_VECTOR &&
5343 Sc.getOpcode() != ISD::BUILD_VECTOR) {
5345 if (!Subtarget->hasInt256())
5348 // Use the register form of the broadcast instruction available on AVX2.
5349 if (VT.getSizeInBits() >= 256)
5350 Sc = Extract128BitVector(Sc, 0, DAG, dl);
5351 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Sc);
5354 Ld = Sc.getOperand(0);
5355 ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
5356 Ld.getOpcode() == ISD::ConstantFP);
5358 // The scalar_to_vector node and the suspected
5359 // load node must have exactly one user.
5360 // Constants may have multiple users.
5362 // AVX-512 has register version of the broadcast
5363 bool hasRegVer = Subtarget->hasAVX512() && VT.is512BitVector() &&
5364 Ld.getValueType().getSizeInBits() >= 32;
5365 if (!ConstSplatVal && ((!Sc.hasOneUse() || !Ld.hasOneUse()) &&
5372 unsigned ScalarSize = Ld.getValueType().getSizeInBits();
5373 bool IsGE256 = (VT.getSizeInBits() >= 256);
5375 // When optimizing for size, generate up to 5 extra bytes for a broadcast
5376 // instruction to save 8 or more bytes of constant pool data.
5377 // TODO: If multiple splats are generated to load the same constant,
5378 // it may be detrimental to overall size. There needs to be a way to detect
5379 // that condition to know if this is truly a size win.
5380 bool OptForSize = DAG.getMachineFunction().getFunction()->optForSize();
5382 // Handle broadcasting a single constant scalar from the constant pool
5384 // On Sandybridge (no AVX2), it is still better to load a constant vector
5385 // from the constant pool and not to broadcast it from a scalar.
5386 // But override that restriction when optimizing for size.
5387 // TODO: Check if splatting is recommended for other AVX-capable CPUs.
5388 if (ConstSplatVal && (Subtarget->hasAVX2() || OptForSize)) {
5389 EVT CVT = Ld.getValueType();
5390 assert(!CVT.isVector() && "Must not broadcast a vector type");
5392 // Splat f32, i32, v4f64, v4i64 in all cases with AVX2.
5393 // For size optimization, also splat v2f64 and v2i64, and for size opt
5394 // with AVX2, also splat i8 and i16.
5395 // With pattern matching, the VBROADCAST node may become a VMOVDDUP.
5396 if (ScalarSize == 32 || (IsGE256 && ScalarSize == 64) ||
5397 (OptForSize && (ScalarSize == 64 || Subtarget->hasAVX2()))) {
5398 const Constant *C = nullptr;
5399 if (ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Ld))
5400 C = CI->getConstantIntValue();
5401 else if (ConstantFPSDNode *CF = dyn_cast<ConstantFPSDNode>(Ld))
5402 C = CF->getConstantFPValue();
5404 assert(C && "Invalid constant type");
5406 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5408 DAG.getConstantPool(C, TLI.getPointerTy(DAG.getDataLayout()));
5409 unsigned Alignment = cast<ConstantPoolSDNode>(CP)->getAlignment();
5411 CVT, dl, DAG.getEntryNode(), CP,
5412 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()), false,
5413 false, false, Alignment);
5415 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5419 bool IsLoad = ISD::isNormalLoad(Ld.getNode());
5421 // Handle AVX2 in-register broadcasts.
5422 if (!IsLoad && Subtarget->hasInt256() &&
5423 (ScalarSize == 32 || (IsGE256 && ScalarSize == 64)))
5424 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5426 // The scalar source must be a normal load.
5430 if (ScalarSize == 32 || (IsGE256 && ScalarSize == 64) ||
5431 (Subtarget->hasVLX() && ScalarSize == 64))
5432 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5434 // The integer check is needed for the 64-bit into 128-bit so it doesn't match
5435 // double since there is no vbroadcastsd xmm
5436 if (Subtarget->hasInt256() && Ld.getValueType().isInteger()) {
5437 if (ScalarSize == 8 || ScalarSize == 16 || ScalarSize == 64)
5438 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5441 // Unsupported broadcast.
5445 /// \brief For an EXTRACT_VECTOR_ELT with a constant index return the real
5446 /// underlying vector and index.
5448 /// Modifies \p ExtractedFromVec to the real vector and returns the real
5450 static int getUnderlyingExtractedFromVec(SDValue &ExtractedFromVec,
5452 int Idx = cast<ConstantSDNode>(ExtIdx)->getZExtValue();
5453 if (!isa<ShuffleVectorSDNode>(ExtractedFromVec))
5456 // For 256-bit vectors, LowerEXTRACT_VECTOR_ELT_SSE4 may have already
5458 // (extract_vector_elt (v8f32 %vreg1), Constant<6>)
5460 // (extract_vector_elt (vector_shuffle<2,u,u,u>
5461 // (extract_subvector (v8f32 %vreg0), Constant<4>),
5464 // In this case the vector is the extract_subvector expression and the index
5465 // is 2, as specified by the shuffle.
5466 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(ExtractedFromVec);
5467 SDValue ShuffleVec = SVOp->getOperand(0);
5468 MVT ShuffleVecVT = ShuffleVec.getSimpleValueType();
5469 assert(ShuffleVecVT.getVectorElementType() ==
5470 ExtractedFromVec.getSimpleValueType().getVectorElementType());
5472 int ShuffleIdx = SVOp->getMaskElt(Idx);
5473 if (isUndefOrInRange(ShuffleIdx, 0, ShuffleVecVT.getVectorNumElements())) {
5474 ExtractedFromVec = ShuffleVec;
5480 static SDValue buildFromShuffleMostly(SDValue Op, SelectionDAG &DAG) {
5481 MVT VT = Op.getSimpleValueType();
5483 // Skip if insert_vec_elt is not supported.
5484 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5485 if (!TLI.isOperationLegalOrCustom(ISD::INSERT_VECTOR_ELT, VT))
5489 unsigned NumElems = Op.getNumOperands();
5493 SmallVector<unsigned, 4> InsertIndices;
5494 SmallVector<int, 8> Mask(NumElems, -1);
5496 for (unsigned i = 0; i != NumElems; ++i) {
5497 unsigned Opc = Op.getOperand(i).getOpcode();
5499 if (Opc == ISD::UNDEF)
5502 if (Opc != ISD::EXTRACT_VECTOR_ELT) {
5503 // Quit if more than 1 elements need inserting.
5504 if (InsertIndices.size() > 1)
5507 InsertIndices.push_back(i);
5511 SDValue ExtractedFromVec = Op.getOperand(i).getOperand(0);
5512 SDValue ExtIdx = Op.getOperand(i).getOperand(1);
5513 // Quit if non-constant index.
5514 if (!isa<ConstantSDNode>(ExtIdx))
5516 int Idx = getUnderlyingExtractedFromVec(ExtractedFromVec, ExtIdx);
5518 // Quit if extracted from vector of different type.
5519 if (ExtractedFromVec.getValueType() != VT)
5522 if (!VecIn1.getNode())
5523 VecIn1 = ExtractedFromVec;
5524 else if (VecIn1 != ExtractedFromVec) {
5525 if (!VecIn2.getNode())
5526 VecIn2 = ExtractedFromVec;
5527 else if (VecIn2 != ExtractedFromVec)
5528 // Quit if more than 2 vectors to shuffle
5532 if (ExtractedFromVec == VecIn1)
5534 else if (ExtractedFromVec == VecIn2)
5535 Mask[i] = Idx + NumElems;
5538 if (!VecIn1.getNode())
5541 VecIn2 = VecIn2.getNode() ? VecIn2 : DAG.getUNDEF(VT);
5542 SDValue NV = DAG.getVectorShuffle(VT, DL, VecIn1, VecIn2, &Mask[0]);
5543 for (unsigned i = 0, e = InsertIndices.size(); i != e; ++i) {
5544 unsigned Idx = InsertIndices[i];
5545 NV = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, VT, NV, Op.getOperand(Idx),
5546 DAG.getIntPtrConstant(Idx, DL));
5552 static SDValue ConvertI1VectorToInteger(SDValue Op, SelectionDAG &DAG) {
5553 assert(ISD::isBuildVectorOfConstantSDNodes(Op.getNode()) &&
5554 Op.getScalarValueSizeInBits() == 1 &&
5555 "Can not convert non-constant vector");
5556 uint64_t Immediate = 0;
5557 for (unsigned idx = 0, e = Op.getNumOperands(); idx < e; ++idx) {
5558 SDValue In = Op.getOperand(idx);
5559 if (In.getOpcode() != ISD::UNDEF)
5560 Immediate |= cast<ConstantSDNode>(In)->getZExtValue() << idx;
5564 MVT::getIntegerVT(std::max((int)Op.getValueType().getSizeInBits(), 8));
5565 return DAG.getConstant(Immediate, dl, VT);
5567 // Lower BUILD_VECTOR operation for v8i1 and v16i1 types.
5569 X86TargetLowering::LowerBUILD_VECTORvXi1(SDValue Op, SelectionDAG &DAG) const {
5571 MVT VT = Op.getSimpleValueType();
5572 assert((VT.getVectorElementType() == MVT::i1) &&
5573 "Unexpected type in LowerBUILD_VECTORvXi1!");
5576 if (ISD::isBuildVectorAllZeros(Op.getNode())) {
5577 SDValue Cst = DAG.getTargetConstant(0, dl, MVT::i1);
5578 SmallVector<SDValue, 16> Ops(VT.getVectorNumElements(), Cst);
5579 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
5582 if (ISD::isBuildVectorAllOnes(Op.getNode())) {
5583 SDValue Cst = DAG.getTargetConstant(1, dl, MVT::i1);
5584 SmallVector<SDValue, 16> Ops(VT.getVectorNumElements(), Cst);
5585 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
5588 if (ISD::isBuildVectorOfConstantSDNodes(Op.getNode())) {
5589 SDValue Imm = ConvertI1VectorToInteger(Op, DAG);
5590 if (Imm.getValueSizeInBits() == VT.getSizeInBits())
5591 return DAG.getBitcast(VT, Imm);
5592 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, Imm);
5593 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, ExtVec,
5594 DAG.getIntPtrConstant(0, dl));
5597 // Vector has one or more non-const elements
5598 uint64_t Immediate = 0;
5599 SmallVector<unsigned, 16> NonConstIdx;
5600 bool IsSplat = true;
5601 bool HasConstElts = false;
5603 for (unsigned idx = 0, e = Op.getNumOperands(); idx < e; ++idx) {
5604 SDValue In = Op.getOperand(idx);
5605 if (In.getOpcode() == ISD::UNDEF)
5607 if (!isa<ConstantSDNode>(In))
5608 NonConstIdx.push_back(idx);
5610 Immediate |= cast<ConstantSDNode>(In)->getZExtValue() << idx;
5611 HasConstElts = true;
5615 else if (In != Op.getOperand(SplatIdx))
5619 // for splat use " (select i1 splat_elt, all-ones, all-zeroes)"
5621 return DAG.getNode(ISD::SELECT, dl, VT, Op.getOperand(SplatIdx),
5622 DAG.getConstant(1, dl, VT),
5623 DAG.getConstant(0, dl, VT));
5625 // insert elements one by one
5629 MVT ImmVT = MVT::getIntegerVT(std::max((int)VT.getSizeInBits(), 8));
5630 Imm = DAG.getConstant(Immediate, dl, ImmVT);
5632 else if (HasConstElts)
5633 Imm = DAG.getConstant(0, dl, VT);
5635 Imm = DAG.getUNDEF(VT);
5636 if (Imm.getValueSizeInBits() == VT.getSizeInBits())
5637 DstVec = DAG.getBitcast(VT, Imm);
5639 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, Imm);
5640 DstVec = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, ExtVec,
5641 DAG.getIntPtrConstant(0, dl));
5644 for (unsigned i = 0; i < NonConstIdx.size(); ++i) {
5645 unsigned InsertIdx = NonConstIdx[i];
5646 DstVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, DstVec,
5647 Op.getOperand(InsertIdx),
5648 DAG.getIntPtrConstant(InsertIdx, dl));
5653 /// \brief Return true if \p N implements a horizontal binop and return the
5654 /// operands for the horizontal binop into V0 and V1.
5656 /// This is a helper function of LowerToHorizontalOp().
5657 /// This function checks that the build_vector \p N in input implements a
5658 /// horizontal operation. Parameter \p Opcode defines the kind of horizontal
5659 /// operation to match.
5660 /// For example, if \p Opcode is equal to ISD::ADD, then this function
5661 /// checks if \p N implements a horizontal arithmetic add; if instead \p Opcode
5662 /// is equal to ISD::SUB, then this function checks if this is a horizontal
5665 /// This function only analyzes elements of \p N whose indices are
5666 /// in range [BaseIdx, LastIdx).
5667 static bool isHorizontalBinOp(const BuildVectorSDNode *N, unsigned Opcode,
5669 unsigned BaseIdx, unsigned LastIdx,
5670 SDValue &V0, SDValue &V1) {
5671 EVT VT = N->getValueType(0);
5673 assert(BaseIdx * 2 <= LastIdx && "Invalid Indices in input!");
5674 assert(VT.isVector() && VT.getVectorNumElements() >= LastIdx &&
5675 "Invalid Vector in input!");
5677 bool IsCommutable = (Opcode == ISD::ADD || Opcode == ISD::FADD);
5678 bool CanFold = true;
5679 unsigned ExpectedVExtractIdx = BaseIdx;
5680 unsigned NumElts = LastIdx - BaseIdx;
5681 V0 = DAG.getUNDEF(VT);
5682 V1 = DAG.getUNDEF(VT);
5684 // Check if N implements a horizontal binop.
5685 for (unsigned i = 0, e = NumElts; i != e && CanFold; ++i) {
5686 SDValue Op = N->getOperand(i + BaseIdx);
5689 if (Op->getOpcode() == ISD::UNDEF) {
5690 // Update the expected vector extract index.
5691 if (i * 2 == NumElts)
5692 ExpectedVExtractIdx = BaseIdx;
5693 ExpectedVExtractIdx += 2;
5697 CanFold = Op->getOpcode() == Opcode && Op->hasOneUse();
5702 SDValue Op0 = Op.getOperand(0);
5703 SDValue Op1 = Op.getOperand(1);
5705 // Try to match the following pattern:
5706 // (BINOP (extract_vector_elt A, I), (extract_vector_elt A, I+1))
5707 CanFold = (Op0.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
5708 Op1.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
5709 Op0.getOperand(0) == Op1.getOperand(0) &&
5710 isa<ConstantSDNode>(Op0.getOperand(1)) &&
5711 isa<ConstantSDNode>(Op1.getOperand(1)));
5715 unsigned I0 = cast<ConstantSDNode>(Op0.getOperand(1))->getZExtValue();
5716 unsigned I1 = cast<ConstantSDNode>(Op1.getOperand(1))->getZExtValue();
5718 if (i * 2 < NumElts) {
5719 if (V0.getOpcode() == ISD::UNDEF) {
5720 V0 = Op0.getOperand(0);
5721 if (V0.getValueType() != VT)
5725 if (V1.getOpcode() == ISD::UNDEF) {
5726 V1 = Op0.getOperand(0);
5727 if (V1.getValueType() != VT)
5730 if (i * 2 == NumElts)
5731 ExpectedVExtractIdx = BaseIdx;
5734 SDValue Expected = (i * 2 < NumElts) ? V0 : V1;
5735 if (I0 == ExpectedVExtractIdx)
5736 CanFold = I1 == I0 + 1 && Op0.getOperand(0) == Expected;
5737 else if (IsCommutable && I1 == ExpectedVExtractIdx) {
5738 // Try to match the following dag sequence:
5739 // (BINOP (extract_vector_elt A, I+1), (extract_vector_elt A, I))
5740 CanFold = I0 == I1 + 1 && Op1.getOperand(0) == Expected;
5744 ExpectedVExtractIdx += 2;
5750 /// \brief Emit a sequence of two 128-bit horizontal add/sub followed by
5751 /// a concat_vector.
5753 /// This is a helper function of LowerToHorizontalOp().
5754 /// This function expects two 256-bit vectors called V0 and V1.
5755 /// At first, each vector is split into two separate 128-bit vectors.
5756 /// Then, the resulting 128-bit vectors are used to implement two
5757 /// horizontal binary operations.
5759 /// The kind of horizontal binary operation is defined by \p X86Opcode.
5761 /// \p Mode specifies how the 128-bit parts of V0 and V1 are passed in input to
5762 /// the two new horizontal binop.
5763 /// When Mode is set, the first horizontal binop dag node would take as input
5764 /// the lower 128-bit of V0 and the upper 128-bit of V0. The second
5765 /// horizontal binop dag node would take as input the lower 128-bit of V1
5766 /// and the upper 128-bit of V1.
5768 /// HADD V0_LO, V0_HI
5769 /// HADD V1_LO, V1_HI
5771 /// Otherwise, the first horizontal binop dag node takes as input the lower
5772 /// 128-bit of V0 and the lower 128-bit of V1, and the second horizontal binop
5773 /// dag node takes the upper 128-bit of V0 and the upper 128-bit of V1.
5775 /// HADD V0_LO, V1_LO
5776 /// HADD V0_HI, V1_HI
5778 /// If \p isUndefLO is set, then the algorithm propagates UNDEF to the lower
5779 /// 128-bits of the result. If \p isUndefHI is set, then UNDEF is propagated to
5780 /// the upper 128-bits of the result.
5781 static SDValue ExpandHorizontalBinOp(const SDValue &V0, const SDValue &V1,
5782 SDLoc DL, SelectionDAG &DAG,
5783 unsigned X86Opcode, bool Mode,
5784 bool isUndefLO, bool isUndefHI) {
5785 EVT VT = V0.getValueType();
5786 assert(VT.is256BitVector() && VT == V1.getValueType() &&
5787 "Invalid nodes in input!");
5789 unsigned NumElts = VT.getVectorNumElements();
5790 SDValue V0_LO = Extract128BitVector(V0, 0, DAG, DL);
5791 SDValue V0_HI = Extract128BitVector(V0, NumElts/2, DAG, DL);
5792 SDValue V1_LO = Extract128BitVector(V1, 0, DAG, DL);
5793 SDValue V1_HI = Extract128BitVector(V1, NumElts/2, DAG, DL);
5794 EVT NewVT = V0_LO.getValueType();
5796 SDValue LO = DAG.getUNDEF(NewVT);
5797 SDValue HI = DAG.getUNDEF(NewVT);
5800 // Don't emit a horizontal binop if the result is expected to be UNDEF.
5801 if (!isUndefLO && V0->getOpcode() != ISD::UNDEF)
5802 LO = DAG.getNode(X86Opcode, DL, NewVT, V0_LO, V0_HI);
5803 if (!isUndefHI && V1->getOpcode() != ISD::UNDEF)
5804 HI = DAG.getNode(X86Opcode, DL, NewVT, V1_LO, V1_HI);
5806 // Don't emit a horizontal binop if the result is expected to be UNDEF.
5807 if (!isUndefLO && (V0_LO->getOpcode() != ISD::UNDEF ||
5808 V1_LO->getOpcode() != ISD::UNDEF))
5809 LO = DAG.getNode(X86Opcode, DL, NewVT, V0_LO, V1_LO);
5811 if (!isUndefHI && (V0_HI->getOpcode() != ISD::UNDEF ||
5812 V1_HI->getOpcode() != ISD::UNDEF))
5813 HI = DAG.getNode(X86Opcode, DL, NewVT, V0_HI, V1_HI);
5816 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, LO, HI);
5819 /// Try to fold a build_vector that performs an 'addsub' to an X86ISD::ADDSUB
5821 static SDValue LowerToAddSub(const BuildVectorSDNode *BV,
5822 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
5823 EVT VT = BV->getValueType(0);
5824 if ((!Subtarget->hasSSE3() || (VT != MVT::v4f32 && VT != MVT::v2f64)) &&
5825 (!Subtarget->hasAVX() || (VT != MVT::v8f32 && VT != MVT::v4f64)))
5829 unsigned NumElts = VT.getVectorNumElements();
5830 SDValue InVec0 = DAG.getUNDEF(VT);
5831 SDValue InVec1 = DAG.getUNDEF(VT);
5833 assert((VT == MVT::v8f32 || VT == MVT::v4f64 || VT == MVT::v4f32 ||
5834 VT == MVT::v2f64) && "build_vector with an invalid type found!");
5836 // Odd-numbered elements in the input build vector are obtained from
5837 // adding two integer/float elements.
5838 // Even-numbered elements in the input build vector are obtained from
5839 // subtracting two integer/float elements.
5840 unsigned ExpectedOpcode = ISD::FSUB;
5841 unsigned NextExpectedOpcode = ISD::FADD;
5842 bool AddFound = false;
5843 bool SubFound = false;
5845 for (unsigned i = 0, e = NumElts; i != e; ++i) {
5846 SDValue Op = BV->getOperand(i);
5848 // Skip 'undef' values.
5849 unsigned Opcode = Op.getOpcode();
5850 if (Opcode == ISD::UNDEF) {
5851 std::swap(ExpectedOpcode, NextExpectedOpcode);
5855 // Early exit if we found an unexpected opcode.
5856 if (Opcode != ExpectedOpcode)
5859 SDValue Op0 = Op.getOperand(0);
5860 SDValue Op1 = Op.getOperand(1);
5862 // Try to match the following pattern:
5863 // (BINOP (extract_vector_elt A, i), (extract_vector_elt B, i))
5864 // Early exit if we cannot match that sequence.
5865 if (Op0.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
5866 Op1.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
5867 !isa<ConstantSDNode>(Op0.getOperand(1)) ||
5868 !isa<ConstantSDNode>(Op1.getOperand(1)) ||
5869 Op0.getOperand(1) != Op1.getOperand(1))
5872 unsigned I0 = cast<ConstantSDNode>(Op0.getOperand(1))->getZExtValue();
5876 // We found a valid add/sub node. Update the information accordingly.
5882 // Update InVec0 and InVec1.
5883 if (InVec0.getOpcode() == ISD::UNDEF) {
5884 InVec0 = Op0.getOperand(0);
5885 if (InVec0.getValueType() != VT)
5888 if (InVec1.getOpcode() == ISD::UNDEF) {
5889 InVec1 = Op1.getOperand(0);
5890 if (InVec1.getValueType() != VT)
5894 // Make sure that operands in input to each add/sub node always
5895 // come from a same pair of vectors.
5896 if (InVec0 != Op0.getOperand(0)) {
5897 if (ExpectedOpcode == ISD::FSUB)
5900 // FADD is commutable. Try to commute the operands
5901 // and then test again.
5902 std::swap(Op0, Op1);
5903 if (InVec0 != Op0.getOperand(0))
5907 if (InVec1 != Op1.getOperand(0))
5910 // Update the pair of expected opcodes.
5911 std::swap(ExpectedOpcode, NextExpectedOpcode);
5914 // Don't try to fold this build_vector into an ADDSUB if the inputs are undef.
5915 if (AddFound && SubFound && InVec0.getOpcode() != ISD::UNDEF &&
5916 InVec1.getOpcode() != ISD::UNDEF)
5917 return DAG.getNode(X86ISD::ADDSUB, DL, VT, InVec0, InVec1);
5922 /// Lower BUILD_VECTOR to a horizontal add/sub operation if possible.
5923 static SDValue LowerToHorizontalOp(const BuildVectorSDNode *BV,
5924 const X86Subtarget *Subtarget,
5925 SelectionDAG &DAG) {
5926 EVT VT = BV->getValueType(0);
5927 unsigned NumElts = VT.getVectorNumElements();
5928 unsigned NumUndefsLO = 0;
5929 unsigned NumUndefsHI = 0;
5930 unsigned Half = NumElts/2;
5932 // Count the number of UNDEF operands in the build_vector in input.
5933 for (unsigned i = 0, e = Half; i != e; ++i)
5934 if (BV->getOperand(i)->getOpcode() == ISD::UNDEF)
5937 for (unsigned i = Half, e = NumElts; i != e; ++i)
5938 if (BV->getOperand(i)->getOpcode() == ISD::UNDEF)
5941 // Early exit if this is either a build_vector of all UNDEFs or all the
5942 // operands but one are UNDEF.
5943 if (NumUndefsLO + NumUndefsHI + 1 >= NumElts)
5947 SDValue InVec0, InVec1;
5948 if ((VT == MVT::v4f32 || VT == MVT::v2f64) && Subtarget->hasSSE3()) {
5949 // Try to match an SSE3 float HADD/HSUB.
5950 if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, NumElts, InVec0, InVec1))
5951 return DAG.getNode(X86ISD::FHADD, DL, VT, InVec0, InVec1);
5953 if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, NumElts, InVec0, InVec1))
5954 return DAG.getNode(X86ISD::FHSUB, DL, VT, InVec0, InVec1);
5955 } else if ((VT == MVT::v4i32 || VT == MVT::v8i16) && Subtarget->hasSSSE3()) {
5956 // Try to match an SSSE3 integer HADD/HSUB.
5957 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, NumElts, InVec0, InVec1))
5958 return DAG.getNode(X86ISD::HADD, DL, VT, InVec0, InVec1);
5960 if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, NumElts, InVec0, InVec1))
5961 return DAG.getNode(X86ISD::HSUB, DL, VT, InVec0, InVec1);
5964 if (!Subtarget->hasAVX())
5967 if ((VT == MVT::v8f32 || VT == MVT::v4f64)) {
5968 // Try to match an AVX horizontal add/sub of packed single/double
5969 // precision floating point values from 256-bit vectors.
5970 SDValue InVec2, InVec3;
5971 if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, Half, InVec0, InVec1) &&
5972 isHorizontalBinOp(BV, ISD::FADD, DAG, Half, NumElts, InVec2, InVec3) &&
5973 ((InVec0.getOpcode() == ISD::UNDEF ||
5974 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
5975 ((InVec1.getOpcode() == ISD::UNDEF ||
5976 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
5977 return DAG.getNode(X86ISD::FHADD, DL, VT, InVec0, InVec1);
5979 if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, Half, InVec0, InVec1) &&
5980 isHorizontalBinOp(BV, ISD::FSUB, DAG, Half, NumElts, InVec2, InVec3) &&
5981 ((InVec0.getOpcode() == ISD::UNDEF ||
5982 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
5983 ((InVec1.getOpcode() == ISD::UNDEF ||
5984 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
5985 return DAG.getNode(X86ISD::FHSUB, DL, VT, InVec0, InVec1);
5986 } else if (VT == MVT::v8i32 || VT == MVT::v16i16) {
5987 // Try to match an AVX2 horizontal add/sub of signed integers.
5988 SDValue InVec2, InVec3;
5990 bool CanFold = true;
5992 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, Half, InVec0, InVec1) &&
5993 isHorizontalBinOp(BV, ISD::ADD, DAG, Half, NumElts, InVec2, InVec3) &&
5994 ((InVec0.getOpcode() == ISD::UNDEF ||
5995 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
5996 ((InVec1.getOpcode() == ISD::UNDEF ||
5997 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
5998 X86Opcode = X86ISD::HADD;
5999 else if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, Half, InVec0, InVec1) &&
6000 isHorizontalBinOp(BV, ISD::SUB, DAG, Half, NumElts, InVec2, InVec3) &&
6001 ((InVec0.getOpcode() == ISD::UNDEF ||
6002 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
6003 ((InVec1.getOpcode() == ISD::UNDEF ||
6004 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
6005 X86Opcode = X86ISD::HSUB;
6010 // Fold this build_vector into a single horizontal add/sub.
6011 // Do this only if the target has AVX2.
6012 if (Subtarget->hasAVX2())
6013 return DAG.getNode(X86Opcode, DL, VT, InVec0, InVec1);
6015 // Do not try to expand this build_vector into a pair of horizontal
6016 // add/sub if we can emit a pair of scalar add/sub.
6017 if (NumUndefsLO + 1 == Half || NumUndefsHI + 1 == Half)
6020 // Convert this build_vector into a pair of horizontal binop followed by
6022 bool isUndefLO = NumUndefsLO == Half;
6023 bool isUndefHI = NumUndefsHI == Half;
6024 return ExpandHorizontalBinOp(InVec0, InVec1, DL, DAG, X86Opcode, false,
6025 isUndefLO, isUndefHI);
6029 if ((VT == MVT::v8f32 || VT == MVT::v4f64 || VT == MVT::v8i32 ||
6030 VT == MVT::v16i16) && Subtarget->hasAVX()) {
6032 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, NumElts, InVec0, InVec1))
6033 X86Opcode = X86ISD::HADD;
6034 else if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, NumElts, InVec0, InVec1))
6035 X86Opcode = X86ISD::HSUB;
6036 else if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, NumElts, InVec0, InVec1))
6037 X86Opcode = X86ISD::FHADD;
6038 else if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, NumElts, InVec0, InVec1))
6039 X86Opcode = X86ISD::FHSUB;
6043 // Don't try to expand this build_vector into a pair of horizontal add/sub
6044 // if we can simply emit a pair of scalar add/sub.
6045 if (NumUndefsLO + 1 == Half || NumUndefsHI + 1 == Half)
6048 // Convert this build_vector into two horizontal add/sub followed by
6050 bool isUndefLO = NumUndefsLO == Half;
6051 bool isUndefHI = NumUndefsHI == Half;
6052 return ExpandHorizontalBinOp(InVec0, InVec1, DL, DAG, X86Opcode, true,
6053 isUndefLO, isUndefHI);
6060 X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
6063 MVT VT = Op.getSimpleValueType();
6064 MVT ExtVT = VT.getVectorElementType();
6065 unsigned NumElems = Op.getNumOperands();
6067 // Generate vectors for predicate vectors.
6068 if (VT.getScalarType() == MVT::i1 && Subtarget->hasAVX512())
6069 return LowerBUILD_VECTORvXi1(Op, DAG);
6071 // Vectors containing all zeros can be matched by pxor and xorps later
6072 if (ISD::isBuildVectorAllZeros(Op.getNode())) {
6073 // Canonicalize this to <4 x i32> to 1) ensure the zero vectors are CSE'd
6074 // and 2) ensure that i64 scalars are eliminated on x86-32 hosts.
6075 if (VT == MVT::v4i32 || VT == MVT::v8i32 || VT == MVT::v16i32)
6078 return getZeroVector(VT, Subtarget, DAG, dl);
6081 // Vectors containing all ones can be matched by pcmpeqd on 128-bit width
6082 // vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
6083 // vpcmpeqd on 256-bit vectors.
6084 if (Subtarget->hasSSE2() && ISD::isBuildVectorAllOnes(Op.getNode())) {
6085 if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget->hasInt256()))
6088 if (!VT.is512BitVector())
6089 return getOnesVector(VT, Subtarget, DAG, dl);
6092 BuildVectorSDNode *BV = cast<BuildVectorSDNode>(Op.getNode());
6093 if (SDValue AddSub = LowerToAddSub(BV, Subtarget, DAG))
6095 if (SDValue HorizontalOp = LowerToHorizontalOp(BV, Subtarget, DAG))
6096 return HorizontalOp;
6097 if (SDValue Broadcast = LowerVectorBroadcast(Op, Subtarget, DAG))
6100 unsigned EVTBits = ExtVT.getSizeInBits();
6102 unsigned NumZero = 0;
6103 unsigned NumNonZero = 0;
6104 unsigned NonZeros = 0;
6105 bool IsAllConstants = true;
6106 SmallSet<SDValue, 8> Values;
6107 for (unsigned i = 0; i < NumElems; ++i) {
6108 SDValue Elt = Op.getOperand(i);
6109 if (Elt.getOpcode() == ISD::UNDEF)
6112 if (Elt.getOpcode() != ISD::Constant &&
6113 Elt.getOpcode() != ISD::ConstantFP)
6114 IsAllConstants = false;
6115 if (X86::isZeroNode(Elt))
6118 NonZeros |= (1 << i);
6123 // All undef vector. Return an UNDEF. All zero vectors were handled above.
6124 if (NumNonZero == 0)
6125 return DAG.getUNDEF(VT);
6127 // Special case for single non-zero, non-undef, element.
6128 if (NumNonZero == 1) {
6129 unsigned Idx = countTrailingZeros(NonZeros);
6130 SDValue Item = Op.getOperand(Idx);
6132 // If this is an insertion of an i64 value on x86-32, and if the top bits of
6133 // the value are obviously zero, truncate the value to i32 and do the
6134 // insertion that way. Only do this if the value is non-constant or if the
6135 // value is a constant being inserted into element 0. It is cheaper to do
6136 // a constant pool load than it is to do a movd + shuffle.
6137 if (ExtVT == MVT::i64 && !Subtarget->is64Bit() &&
6138 (!IsAllConstants || Idx == 0)) {
6139 if (DAG.MaskedValueIsZero(Item, APInt::getBitsSet(64, 32, 64))) {
6141 assert(VT == MVT::v2i64 && "Expected an SSE value type!");
6142 EVT VecVT = MVT::v4i32;
6144 // Truncate the value (which may itself be a constant) to i32, and
6145 // convert it to a vector with movd (S2V+shuffle to zero extend).
6146 Item = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Item);
6147 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VecVT, Item);
6148 return DAG.getBitcast(VT, getShuffleVectorZeroOrUndef(
6149 Item, Idx * 2, true, Subtarget, DAG));
6153 // If we have a constant or non-constant insertion into the low element of
6154 // a vector, we can do this with SCALAR_TO_VECTOR + shuffle of zero into
6155 // the rest of the elements. This will be matched as movd/movq/movss/movsd
6156 // depending on what the source datatype is.
6159 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6161 if (ExtVT == MVT::i32 || ExtVT == MVT::f32 || ExtVT == MVT::f64 ||
6162 (ExtVT == MVT::i64 && Subtarget->is64Bit())) {
6163 if (VT.is512BitVector()) {
6164 SDValue ZeroVec = getZeroVector(VT, Subtarget, DAG, dl);
6165 return DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, ZeroVec,
6166 Item, DAG.getIntPtrConstant(0, dl));
6168 assert((VT.is128BitVector() || VT.is256BitVector()) &&
6169 "Expected an SSE value type!");
6170 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6171 // Turn it into a MOVL (i.e. movss, movsd, or movd) to a zero vector.
6172 return getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6175 // We can't directly insert an i8 or i16 into a vector, so zero extend
6177 if (ExtVT == MVT::i16 || ExtVT == MVT::i8) {
6178 Item = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Item);
6179 if (VT.is256BitVector()) {
6180 if (Subtarget->hasAVX()) {
6181 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v8i32, Item);
6182 Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6184 // Without AVX, we need to extend to a 128-bit vector and then
6185 // insert into the 256-bit vector.
6186 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, Item);
6187 SDValue ZeroVec = getZeroVector(MVT::v8i32, Subtarget, DAG, dl);
6188 Item = Insert128BitVector(ZeroVec, Item, 0, DAG, dl);
6191 assert(VT.is128BitVector() && "Expected an SSE value type!");
6192 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, Item);
6193 Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6195 return DAG.getBitcast(VT, Item);
6199 // Is it a vector logical left shift?
6200 if (NumElems == 2 && Idx == 1 &&
6201 X86::isZeroNode(Op.getOperand(0)) &&
6202 !X86::isZeroNode(Op.getOperand(1))) {
6203 unsigned NumBits = VT.getSizeInBits();
6204 return getVShift(true, VT,
6205 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
6206 VT, Op.getOperand(1)),
6207 NumBits/2, DAG, *this, dl);
6210 if (IsAllConstants) // Otherwise, it's better to do a constpool load.
6213 // Otherwise, if this is a vector with i32 or f32 elements, and the element
6214 // is a non-constant being inserted into an element other than the low one,
6215 // we can't use a constant pool load. Instead, use SCALAR_TO_VECTOR (aka
6216 // movd/movss) to move this into the low element, then shuffle it into
6218 if (EVTBits == 32) {
6219 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6220 return getShuffleVectorZeroOrUndef(Item, Idx, NumZero > 0, Subtarget, DAG);
6224 // Splat is obviously ok. Let legalizer expand it to a shuffle.
6225 if (Values.size() == 1) {
6226 if (EVTBits == 32) {
6227 // Instead of a shuffle like this:
6228 // shuffle (scalar_to_vector (load (ptr + 4))), undef, <0, 0, 0, 0>
6229 // Check if it's possible to issue this instead.
6230 // shuffle (vload ptr)), undef, <1, 1, 1, 1>
6231 unsigned Idx = countTrailingZeros(NonZeros);
6232 SDValue Item = Op.getOperand(Idx);
6233 if (Op.getNode()->isOnlyUserOf(Item.getNode()))
6234 return LowerAsSplatVectorLoad(Item, VT, dl, DAG);
6239 // A vector full of immediates; various special cases are already
6240 // handled, so this is best done with a single constant-pool load.
6244 // For AVX-length vectors, see if we can use a vector load to get all of the
6245 // elements, otherwise build the individual 128-bit pieces and use
6246 // shuffles to put them in place.
6247 if (VT.is256BitVector() || VT.is512BitVector()) {
6248 SmallVector<SDValue, 64> V(Op->op_begin(), Op->op_begin() + NumElems);
6250 // Check for a build vector of consecutive loads.
6251 if (SDValue LD = EltsFromConsecutiveLoads(VT, V, dl, DAG, false))
6254 EVT HVT = EVT::getVectorVT(*DAG.getContext(), ExtVT, NumElems/2);
6256 // Build both the lower and upper subvector.
6257 SDValue Lower = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT,
6258 makeArrayRef(&V[0], NumElems/2));
6259 SDValue Upper = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT,
6260 makeArrayRef(&V[NumElems / 2], NumElems/2));
6262 // Recreate the wider vector with the lower and upper part.
6263 if (VT.is256BitVector())
6264 return Concat128BitVectors(Lower, Upper, VT, NumElems, DAG, dl);
6265 return Concat256BitVectors(Lower, Upper, VT, NumElems, DAG, dl);
6268 // Let legalizer expand 2-wide build_vectors.
6269 if (EVTBits == 64) {
6270 if (NumNonZero == 1) {
6271 // One half is zero or undef.
6272 unsigned Idx = countTrailingZeros(NonZeros);
6273 SDValue V2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT,
6274 Op.getOperand(Idx));
6275 return getShuffleVectorZeroOrUndef(V2, Idx, true, Subtarget, DAG);
6280 // If element VT is < 32 bits, convert it to inserts into a zero vector.
6281 if (EVTBits == 8 && NumElems == 16)
6282 if (SDValue V = LowerBuildVectorv16i8(Op, NonZeros,NumNonZero,NumZero, DAG,
6286 if (EVTBits == 16 && NumElems == 8)
6287 if (SDValue V = LowerBuildVectorv8i16(Op, NonZeros,NumNonZero,NumZero, DAG,
6291 // If element VT is == 32 bits and has 4 elems, try to generate an INSERTPS
6292 if (EVTBits == 32 && NumElems == 4)
6293 if (SDValue V = LowerBuildVectorv4x32(Op, DAG, Subtarget, *this))
6296 // If element VT is == 32 bits, turn it into a number of shuffles.
6297 SmallVector<SDValue, 8> V(NumElems);
6298 if (NumElems == 4 && NumZero > 0) {
6299 for (unsigned i = 0; i < 4; ++i) {
6300 bool isZero = !(NonZeros & (1 << i));
6302 V[i] = getZeroVector(VT, Subtarget, DAG, dl);
6304 V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
6307 for (unsigned i = 0; i < 2; ++i) {
6308 switch ((NonZeros & (0x3 << i*2)) >> (i*2)) {
6311 V[i] = V[i*2]; // Must be a zero vector.
6314 V[i] = getMOVL(DAG, dl, VT, V[i*2+1], V[i*2]);
6317 V[i] = getMOVL(DAG, dl, VT, V[i*2], V[i*2+1]);
6320 V[i] = getUnpackl(DAG, dl, VT, V[i*2], V[i*2+1]);
6325 bool Reverse1 = (NonZeros & 0x3) == 2;
6326 bool Reverse2 = ((NonZeros & (0x3 << 2)) >> 2) == 2;
6330 static_cast<int>(Reverse2 ? NumElems+1 : NumElems),
6331 static_cast<int>(Reverse2 ? NumElems : NumElems+1)
6333 return DAG.getVectorShuffle(VT, dl, V[0], V[1], &MaskVec[0]);
6336 if (Values.size() > 1 && VT.is128BitVector()) {
6337 // Check for a build vector of consecutive loads.
6338 for (unsigned i = 0; i < NumElems; ++i)
6339 V[i] = Op.getOperand(i);
6341 // Check for elements which are consecutive loads.
6342 if (SDValue LD = EltsFromConsecutiveLoads(VT, V, dl, DAG, false))
6345 // Check for a build vector from mostly shuffle plus few inserting.
6346 if (SDValue Sh = buildFromShuffleMostly(Op, DAG))
6349 // For SSE 4.1, use insertps to put the high elements into the low element.
6350 if (Subtarget->hasSSE41()) {
6352 if (Op.getOperand(0).getOpcode() != ISD::UNDEF)
6353 Result = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(0));
6355 Result = DAG.getUNDEF(VT);
6357 for (unsigned i = 1; i < NumElems; ++i) {
6358 if (Op.getOperand(i).getOpcode() == ISD::UNDEF) continue;
6359 Result = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Result,
6360 Op.getOperand(i), DAG.getIntPtrConstant(i, dl));
6365 // Otherwise, expand into a number of unpckl*, start by extending each of
6366 // our (non-undef) elements to the full vector width with the element in the
6367 // bottom slot of the vector (which generates no code for SSE).
6368 for (unsigned i = 0; i < NumElems; ++i) {
6369 if (Op.getOperand(i).getOpcode() != ISD::UNDEF)
6370 V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
6372 V[i] = DAG.getUNDEF(VT);
6375 // Next, we iteratively mix elements, e.g. for v4f32:
6376 // Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0>
6377 // : unpcklps 1, 3 ==> Y: <?, ?, 3, 1>
6378 // Step 2: unpcklps X, Y ==> <3, 2, 1, 0>
6379 unsigned EltStride = NumElems >> 1;
6380 while (EltStride != 0) {
6381 for (unsigned i = 0; i < EltStride; ++i) {
6382 // If V[i+EltStride] is undef and this is the first round of mixing,
6383 // then it is safe to just drop this shuffle: V[i] is already in the
6384 // right place, the one element (since it's the first round) being
6385 // inserted as undef can be dropped. This isn't safe for successive
6386 // rounds because they will permute elements within both vectors.
6387 if (V[i+EltStride].getOpcode() == ISD::UNDEF &&
6388 EltStride == NumElems/2)
6391 V[i] = getUnpackl(DAG, dl, VT, V[i], V[i + EltStride]);
6400 // 256-bit AVX can use the vinsertf128 instruction
6401 // to create 256-bit vectors from two other 128-bit ones.
6402 static SDValue LowerAVXCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
6404 MVT ResVT = Op.getSimpleValueType();
6406 assert((ResVT.is256BitVector() ||
6407 ResVT.is512BitVector()) && "Value type must be 256-/512-bit wide");
6409 SDValue V1 = Op.getOperand(0);
6410 SDValue V2 = Op.getOperand(1);
6411 unsigned NumElems = ResVT.getVectorNumElements();
6412 if (ResVT.is256BitVector())
6413 return Concat128BitVectors(V1, V2, ResVT, NumElems, DAG, dl);
6415 if (Op.getNumOperands() == 4) {
6416 MVT HalfVT = MVT::getVectorVT(ResVT.getScalarType(),
6417 ResVT.getVectorNumElements()/2);
6418 SDValue V3 = Op.getOperand(2);
6419 SDValue V4 = Op.getOperand(3);
6420 return Concat256BitVectors(Concat128BitVectors(V1, V2, HalfVT, NumElems/2, DAG, dl),
6421 Concat128BitVectors(V3, V4, HalfVT, NumElems/2, DAG, dl), ResVT, NumElems, DAG, dl);
6423 return Concat256BitVectors(V1, V2, ResVT, NumElems, DAG, dl);
6426 static SDValue LowerCONCAT_VECTORSvXi1(SDValue Op,
6427 const X86Subtarget *Subtarget,
6428 SelectionDAG & DAG) {
6430 MVT ResVT = Op.getSimpleValueType();
6431 unsigned NumOfOperands = Op.getNumOperands();
6433 assert(isPowerOf2_32(NumOfOperands) &&
6434 "Unexpected number of operands in CONCAT_VECTORS");
6436 if (NumOfOperands > 2) {
6437 MVT HalfVT = MVT::getVectorVT(ResVT.getScalarType(),
6438 ResVT.getVectorNumElements()/2);
6439 SmallVector<SDValue, 2> Ops;
6440 for (unsigned i = 0; i < NumOfOperands/2; i++)
6441 Ops.push_back(Op.getOperand(i));
6442 SDValue Lo = DAG.getNode(ISD::CONCAT_VECTORS, dl, HalfVT, Ops);
6444 for (unsigned i = NumOfOperands/2; i < NumOfOperands; i++)
6445 Ops.push_back(Op.getOperand(i));
6446 SDValue Hi = DAG.getNode(ISD::CONCAT_VECTORS, dl, HalfVT, Ops);
6447 return DAG.getNode(ISD::CONCAT_VECTORS, dl, ResVT, Lo, Hi);
6450 SDValue V1 = Op.getOperand(0);
6451 SDValue V2 = Op.getOperand(1);
6452 bool IsZeroV1 = ISD::isBuildVectorAllZeros(V1.getNode());
6453 bool IsZeroV2 = ISD::isBuildVectorAllZeros(V2.getNode());
6455 if (IsZeroV1 && IsZeroV2)
6456 return getZeroVector(ResVT, Subtarget, DAG, dl);
6458 SDValue ZeroIdx = DAG.getIntPtrConstant(0, dl);
6459 SDValue Undef = DAG.getUNDEF(ResVT);
6460 unsigned NumElems = ResVT.getVectorNumElements();
6461 SDValue ShiftBits = DAG.getConstant(NumElems/2, dl, MVT::i8);
6463 V2 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef, V2, ZeroIdx);
6464 V2 = DAG.getNode(X86ISD::VSHLI, dl, ResVT, V2, ShiftBits);
6468 V1 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef, V1, ZeroIdx);
6469 // Zero the upper bits of V1
6470 V1 = DAG.getNode(X86ISD::VSHLI, dl, ResVT, V1, ShiftBits);
6471 V1 = DAG.getNode(X86ISD::VSRLI, dl, ResVT, V1, ShiftBits);
6474 return DAG.getNode(ISD::OR, dl, ResVT, V1, V2);
6477 static SDValue LowerCONCAT_VECTORS(SDValue Op,
6478 const X86Subtarget *Subtarget,
6479 SelectionDAG &DAG) {
6480 MVT VT = Op.getSimpleValueType();
6481 if (VT.getVectorElementType() == MVT::i1)
6482 return LowerCONCAT_VECTORSvXi1(Op, Subtarget, DAG);
6484 assert((VT.is256BitVector() && Op.getNumOperands() == 2) ||
6485 (VT.is512BitVector() && (Op.getNumOperands() == 2 ||
6486 Op.getNumOperands() == 4)));
6488 // AVX can use the vinsertf128 instruction to create 256-bit vectors
6489 // from two other 128-bit ones.
6491 // 512-bit vector may contain 2 256-bit vectors or 4 128-bit vectors
6492 return LowerAVXCONCAT_VECTORS(Op, DAG);
6495 //===----------------------------------------------------------------------===//
6496 // Vector shuffle lowering
6498 // This is an experimental code path for lowering vector shuffles on x86. It is
6499 // designed to handle arbitrary vector shuffles and blends, gracefully
6500 // degrading performance as necessary. It works hard to recognize idiomatic
6501 // shuffles and lower them to optimal instruction patterns without leaving
6502 // a framework that allows reasonably efficient handling of all vector shuffle
6504 //===----------------------------------------------------------------------===//
6506 /// \brief Tiny helper function to identify a no-op mask.
6508 /// This is a somewhat boring predicate function. It checks whether the mask
6509 /// array input, which is assumed to be a single-input shuffle mask of the kind
6510 /// used by the X86 shuffle instructions (not a fully general
6511 /// ShuffleVectorSDNode mask) requires any shuffles to occur. Both undef and an
6512 /// in-place shuffle are 'no-op's.
6513 static bool isNoopShuffleMask(ArrayRef<int> Mask) {
6514 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6515 if (Mask[i] != -1 && Mask[i] != i)
6520 /// \brief Helper function to classify a mask as a single-input mask.
6522 /// This isn't a generic single-input test because in the vector shuffle
6523 /// lowering we canonicalize single inputs to be the first input operand. This
6524 /// means we can more quickly test for a single input by only checking whether
6525 /// an input from the second operand exists. We also assume that the size of
6526 /// mask corresponds to the size of the input vectors which isn't true in the
6527 /// fully general case.
6528 static bool isSingleInputShuffleMask(ArrayRef<int> Mask) {
6530 if (M >= (int)Mask.size())
6535 /// \brief Test whether there are elements crossing 128-bit lanes in this
6538 /// X86 divides up its shuffles into in-lane and cross-lane shuffle operations
6539 /// and we routinely test for these.
6540 static bool is128BitLaneCrossingShuffleMask(MVT VT, ArrayRef<int> Mask) {
6541 int LaneSize = 128 / VT.getScalarSizeInBits();
6542 int Size = Mask.size();
6543 for (int i = 0; i < Size; ++i)
6544 if (Mask[i] >= 0 && (Mask[i] % Size) / LaneSize != i / LaneSize)
6549 /// \brief Test whether a shuffle mask is equivalent within each 128-bit lane.
6551 /// This checks a shuffle mask to see if it is performing the same
6552 /// 128-bit lane-relative shuffle in each 128-bit lane. This trivially implies
6553 /// that it is also not lane-crossing. It may however involve a blend from the
6554 /// same lane of a second vector.
6556 /// The specific repeated shuffle mask is populated in \p RepeatedMask, as it is
6557 /// non-trivial to compute in the face of undef lanes. The representation is
6558 /// *not* suitable for use with existing 128-bit shuffles as it will contain
6559 /// entries from both V1 and V2 inputs to the wider mask.
6561 is128BitLaneRepeatedShuffleMask(MVT VT, ArrayRef<int> Mask,
6562 SmallVectorImpl<int> &RepeatedMask) {
6563 int LaneSize = 128 / VT.getScalarSizeInBits();
6564 RepeatedMask.resize(LaneSize, -1);
6565 int Size = Mask.size();
6566 for (int i = 0; i < Size; ++i) {
6569 if ((Mask[i] % Size) / LaneSize != i / LaneSize)
6570 // This entry crosses lanes, so there is no way to model this shuffle.
6573 // Ok, handle the in-lane shuffles by detecting if and when they repeat.
6574 if (RepeatedMask[i % LaneSize] == -1)
6575 // This is the first non-undef entry in this slot of a 128-bit lane.
6576 RepeatedMask[i % LaneSize] =
6577 Mask[i] < Size ? Mask[i] % LaneSize : Mask[i] % LaneSize + Size;
6578 else if (RepeatedMask[i % LaneSize] + (i / LaneSize) * LaneSize != Mask[i])
6579 // Found a mismatch with the repeated mask.
6585 /// \brief Checks whether a shuffle mask is equivalent to an explicit list of
6588 /// This is a fast way to test a shuffle mask against a fixed pattern:
6590 /// if (isShuffleEquivalent(Mask, 3, 2, {1, 0})) { ... }
6592 /// It returns true if the mask is exactly as wide as the argument list, and
6593 /// each element of the mask is either -1 (signifying undef) or the value given
6594 /// in the argument.
6595 static bool isShuffleEquivalent(SDValue V1, SDValue V2, ArrayRef<int> Mask,
6596 ArrayRef<int> ExpectedMask) {
6597 if (Mask.size() != ExpectedMask.size())
6600 int Size = Mask.size();
6602 // If the values are build vectors, we can look through them to find
6603 // equivalent inputs that make the shuffles equivalent.
6604 auto *BV1 = dyn_cast<BuildVectorSDNode>(V1);
6605 auto *BV2 = dyn_cast<BuildVectorSDNode>(V2);
6607 for (int i = 0; i < Size; ++i)
6608 if (Mask[i] != -1 && Mask[i] != ExpectedMask[i]) {
6609 auto *MaskBV = Mask[i] < Size ? BV1 : BV2;
6610 auto *ExpectedBV = ExpectedMask[i] < Size ? BV1 : BV2;
6611 if (!MaskBV || !ExpectedBV ||
6612 MaskBV->getOperand(Mask[i] % Size) !=
6613 ExpectedBV->getOperand(ExpectedMask[i] % Size))
6620 /// \brief Get a 4-lane 8-bit shuffle immediate for a mask.
6622 /// This helper function produces an 8-bit shuffle immediate corresponding to
6623 /// the ubiquitous shuffle encoding scheme used in x86 instructions for
6624 /// shuffling 4 lanes. It can be used with most of the PSHUF instructions for
6627 /// NB: We rely heavily on "undef" masks preserving the input lane.
6628 static SDValue getV4X86ShuffleImm8ForMask(ArrayRef<int> Mask, SDLoc DL,
6629 SelectionDAG &DAG) {
6630 assert(Mask.size() == 4 && "Only 4-lane shuffle masks");
6631 assert(Mask[0] >= -1 && Mask[0] < 4 && "Out of bound mask element!");
6632 assert(Mask[1] >= -1 && Mask[1] < 4 && "Out of bound mask element!");
6633 assert(Mask[2] >= -1 && Mask[2] < 4 && "Out of bound mask element!");
6634 assert(Mask[3] >= -1 && Mask[3] < 4 && "Out of bound mask element!");
6637 Imm |= (Mask[0] == -1 ? 0 : Mask[0]) << 0;
6638 Imm |= (Mask[1] == -1 ? 1 : Mask[1]) << 2;
6639 Imm |= (Mask[2] == -1 ? 2 : Mask[2]) << 4;
6640 Imm |= (Mask[3] == -1 ? 3 : Mask[3]) << 6;
6641 return DAG.getConstant(Imm, DL, MVT::i8);
6644 /// \brief Compute whether each element of a shuffle is zeroable.
6646 /// A "zeroable" vector shuffle element is one which can be lowered to zero.
6647 /// Either it is an undef element in the shuffle mask, the element of the input
6648 /// referenced is undef, or the element of the input referenced is known to be
6649 /// zero. Many x86 shuffles can zero lanes cheaply and we often want to handle
6650 /// as many lanes with this technique as possible to simplify the remaining
6652 static SmallBitVector computeZeroableShuffleElements(ArrayRef<int> Mask,
6653 SDValue V1, SDValue V2) {
6654 SmallBitVector Zeroable(Mask.size(), false);
6656 while (V1.getOpcode() == ISD::BITCAST)
6657 V1 = V1->getOperand(0);
6658 while (V2.getOpcode() == ISD::BITCAST)
6659 V2 = V2->getOperand(0);
6661 bool V1IsZero = ISD::isBuildVectorAllZeros(V1.getNode());
6662 bool V2IsZero = ISD::isBuildVectorAllZeros(V2.getNode());
6664 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6666 // Handle the easy cases.
6667 if (M < 0 || (M >= 0 && M < Size && V1IsZero) || (M >= Size && V2IsZero)) {
6672 // If this is an index into a build_vector node (which has the same number
6673 // of elements), dig out the input value and use it.
6674 SDValue V = M < Size ? V1 : V2;
6675 if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
6678 SDValue Input = V.getOperand(M % Size);
6679 // The UNDEF opcode check really should be dead code here, but not quite
6680 // worth asserting on (it isn't invalid, just unexpected).
6681 if (Input.getOpcode() == ISD::UNDEF || X86::isZeroNode(Input))
6688 // X86 has dedicated unpack instructions that can handle specific blend
6689 // operations: UNPCKH and UNPCKL.
6690 static SDValue lowerVectorShuffleWithUNPCK(SDLoc DL, MVT VT, ArrayRef<int> Mask,
6691 SDValue V1, SDValue V2,
6692 SelectionDAG &DAG) {
6693 int NumElts = VT.getVectorNumElements();
6696 bool UnpcklSwapped = true;
6697 bool UnpckhSwapped = true;
6698 int NumEltsInLane = 128 / VT.getScalarSizeInBits();
6700 for (int i = 0; i < NumElts; ++i) {
6701 unsigned LaneStart = (i / NumEltsInLane) * NumEltsInLane;
6703 int LoPos = (i % NumEltsInLane) / 2 + LaneStart + NumElts * (i % 2);
6704 int HiPos = LoPos + NumEltsInLane / 2;
6705 int LoPosSwapped = (LoPos + NumElts) % (NumElts * 2);
6706 int HiPosSwapped = (HiPos + NumElts) % (NumElts * 2);
6710 if (Mask[i] != LoPos)
6712 if (Mask[i] != HiPos)
6714 if (Mask[i] != LoPosSwapped)
6715 UnpcklSwapped = false;
6716 if (Mask[i] != HiPosSwapped)
6717 UnpckhSwapped = false;
6718 if (!Unpckl && !Unpckh && !UnpcklSwapped && !UnpckhSwapped)
6722 return DAG.getNode(X86ISD::UNPCKL, DL, VT, V1, V2);
6724 return DAG.getNode(X86ISD::UNPCKH, DL, VT, V1, V2);
6726 return DAG.getNode(X86ISD::UNPCKL, DL, VT, V2, V1);
6728 return DAG.getNode(X86ISD::UNPCKH, DL, VT, V2, V1);
6730 llvm_unreachable("Unexpected result of UNPCK mask analysis");
6734 /// \brief Try to emit a bitmask instruction for a shuffle.
6736 /// This handles cases where we can model a blend exactly as a bitmask due to
6737 /// one of the inputs being zeroable.
6738 static SDValue lowerVectorShuffleAsBitMask(SDLoc DL, MVT VT, SDValue V1,
6739 SDValue V2, ArrayRef<int> Mask,
6740 SelectionDAG &DAG) {
6741 MVT EltVT = VT.getScalarType();
6742 int NumEltBits = EltVT.getSizeInBits();
6743 MVT IntEltVT = MVT::getIntegerVT(NumEltBits);
6744 SDValue Zero = DAG.getConstant(0, DL, IntEltVT);
6745 SDValue AllOnes = DAG.getConstant(APInt::getAllOnesValue(NumEltBits), DL,
6747 if (EltVT.isFloatingPoint()) {
6748 Zero = DAG.getBitcast(EltVT, Zero);
6749 AllOnes = DAG.getBitcast(EltVT, AllOnes);
6751 SmallVector<SDValue, 16> VMaskOps(Mask.size(), Zero);
6752 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
6754 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6757 if (Mask[i] % Size != i)
6758 return SDValue(); // Not a blend.
6760 V = Mask[i] < Size ? V1 : V2;
6761 else if (V != (Mask[i] < Size ? V1 : V2))
6762 return SDValue(); // Can only let one input through the mask.
6764 VMaskOps[i] = AllOnes;
6767 return SDValue(); // No non-zeroable elements!
6769 SDValue VMask = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, VMaskOps);
6770 V = DAG.getNode(VT.isFloatingPoint()
6771 ? (unsigned) X86ISD::FAND : (unsigned) ISD::AND,
6776 /// \brief Try to emit a blend instruction for a shuffle using bit math.
6778 /// This is used as a fallback approach when first class blend instructions are
6779 /// unavailable. Currently it is only suitable for integer vectors, but could
6780 /// be generalized for floating point vectors if desirable.
6781 static SDValue lowerVectorShuffleAsBitBlend(SDLoc DL, MVT VT, SDValue V1,
6782 SDValue V2, ArrayRef<int> Mask,
6783 SelectionDAG &DAG) {
6784 assert(VT.isInteger() && "Only supports integer vector types!");
6785 MVT EltVT = VT.getScalarType();
6786 int NumEltBits = EltVT.getSizeInBits();
6787 SDValue Zero = DAG.getConstant(0, DL, EltVT);
6788 SDValue AllOnes = DAG.getConstant(APInt::getAllOnesValue(NumEltBits), DL,
6790 SmallVector<SDValue, 16> MaskOps;
6791 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6792 if (Mask[i] != -1 && Mask[i] != i && Mask[i] != i + Size)
6793 return SDValue(); // Shuffled input!
6794 MaskOps.push_back(Mask[i] < Size ? AllOnes : Zero);
6797 SDValue V1Mask = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, MaskOps);
6798 V1 = DAG.getNode(ISD::AND, DL, VT, V1, V1Mask);
6799 // We have to cast V2 around.
6800 MVT MaskVT = MVT::getVectorVT(MVT::i64, VT.getSizeInBits() / 64);
6801 V2 = DAG.getBitcast(VT, DAG.getNode(X86ISD::ANDNP, DL, MaskVT,
6802 DAG.getBitcast(MaskVT, V1Mask),
6803 DAG.getBitcast(MaskVT, V2)));
6804 return DAG.getNode(ISD::OR, DL, VT, V1, V2);
6807 /// \brief Try to emit a blend instruction for a shuffle.
6809 /// This doesn't do any checks for the availability of instructions for blending
6810 /// these values. It relies on the availability of the X86ISD::BLENDI pattern to
6811 /// be matched in the backend with the type given. What it does check for is
6812 /// that the shuffle mask is in fact a blend.
6813 static SDValue lowerVectorShuffleAsBlend(SDLoc DL, MVT VT, SDValue V1,
6814 SDValue V2, ArrayRef<int> Mask,
6815 const X86Subtarget *Subtarget,
6816 SelectionDAG &DAG) {
6817 unsigned BlendMask = 0;
6818 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6819 if (Mask[i] >= Size) {
6820 if (Mask[i] != i + Size)
6821 return SDValue(); // Shuffled V2 input!
6822 BlendMask |= 1u << i;
6825 if (Mask[i] >= 0 && Mask[i] != i)
6826 return SDValue(); // Shuffled V1 input!
6828 switch (VT.SimpleTy) {
6833 return DAG.getNode(X86ISD::BLENDI, DL, VT, V1, V2,
6834 DAG.getConstant(BlendMask, DL, MVT::i8));
6838 assert(Subtarget->hasAVX2() && "256-bit integer blends require AVX2!");
6842 // If we have AVX2 it is faster to use VPBLENDD when the shuffle fits into
6843 // that instruction.
6844 if (Subtarget->hasAVX2()) {
6845 // Scale the blend by the number of 32-bit dwords per element.
6846 int Scale = VT.getScalarSizeInBits() / 32;
6848 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6849 if (Mask[i] >= Size)
6850 for (int j = 0; j < Scale; ++j)
6851 BlendMask |= 1u << (i * Scale + j);
6853 MVT BlendVT = VT.getSizeInBits() > 128 ? MVT::v8i32 : MVT::v4i32;
6854 V1 = DAG.getBitcast(BlendVT, V1);
6855 V2 = DAG.getBitcast(BlendVT, V2);
6856 return DAG.getBitcast(
6857 VT, DAG.getNode(X86ISD::BLENDI, DL, BlendVT, V1, V2,
6858 DAG.getConstant(BlendMask, DL, MVT::i8)));
6862 // For integer shuffles we need to expand the mask and cast the inputs to
6863 // v8i16s prior to blending.
6864 int Scale = 8 / VT.getVectorNumElements();
6866 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6867 if (Mask[i] >= Size)
6868 for (int j = 0; j < Scale; ++j)
6869 BlendMask |= 1u << (i * Scale + j);
6871 V1 = DAG.getBitcast(MVT::v8i16, V1);
6872 V2 = DAG.getBitcast(MVT::v8i16, V2);
6873 return DAG.getBitcast(VT,
6874 DAG.getNode(X86ISD::BLENDI, DL, MVT::v8i16, V1, V2,
6875 DAG.getConstant(BlendMask, DL, MVT::i8)));
6879 assert(Subtarget->hasAVX2() && "256-bit integer blends require AVX2!");
6880 SmallVector<int, 8> RepeatedMask;
6881 if (is128BitLaneRepeatedShuffleMask(MVT::v16i16, Mask, RepeatedMask)) {
6882 // We can lower these with PBLENDW which is mirrored across 128-bit lanes.
6883 assert(RepeatedMask.size() == 8 && "Repeated mask size doesn't match!");
6885 for (int i = 0; i < 8; ++i)
6886 if (RepeatedMask[i] >= 16)
6887 BlendMask |= 1u << i;
6888 return DAG.getNode(X86ISD::BLENDI, DL, MVT::v16i16, V1, V2,
6889 DAG.getConstant(BlendMask, DL, MVT::i8));
6895 assert((VT.getSizeInBits() == 128 || Subtarget->hasAVX2()) &&
6896 "256-bit byte-blends require AVX2 support!");
6898 // Attempt to lower to a bitmask if we can. VPAND is faster than VPBLENDVB.
6899 if (SDValue Masked = lowerVectorShuffleAsBitMask(DL, VT, V1, V2, Mask, DAG))
6902 // Scale the blend by the number of bytes per element.
6903 int Scale = VT.getScalarSizeInBits() / 8;
6905 // This form of blend is always done on bytes. Compute the byte vector
6907 MVT BlendVT = MVT::getVectorVT(MVT::i8, VT.getSizeInBits() / 8);
6909 // Compute the VSELECT mask. Note that VSELECT is really confusing in the
6910 // mix of LLVM's code generator and the x86 backend. We tell the code
6911 // generator that boolean values in the elements of an x86 vector register
6912 // are -1 for true and 0 for false. We then use the LLVM semantics of 'true'
6913 // mapping a select to operand #1, and 'false' mapping to operand #2. The
6914 // reality in x86 is that vector masks (pre-AVX-512) use only the high bit
6915 // of the element (the remaining are ignored) and 0 in that high bit would
6916 // mean operand #1 while 1 in the high bit would mean operand #2. So while
6917 // the LLVM model for boolean values in vector elements gets the relevant
6918 // bit set, it is set backwards and over constrained relative to x86's
6920 SmallVector<SDValue, 32> VSELECTMask;
6921 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6922 for (int j = 0; j < Scale; ++j)
6923 VSELECTMask.push_back(
6924 Mask[i] < 0 ? DAG.getUNDEF(MVT::i8)
6925 : DAG.getConstant(Mask[i] < Size ? -1 : 0, DL,
6928 V1 = DAG.getBitcast(BlendVT, V1);
6929 V2 = DAG.getBitcast(BlendVT, V2);
6930 return DAG.getBitcast(VT, DAG.getNode(ISD::VSELECT, DL, BlendVT,
6931 DAG.getNode(ISD::BUILD_VECTOR, DL,
6932 BlendVT, VSELECTMask),
6937 llvm_unreachable("Not a supported integer vector type!");
6941 /// \brief Try to lower as a blend of elements from two inputs followed by
6942 /// a single-input permutation.
6944 /// This matches the pattern where we can blend elements from two inputs and
6945 /// then reduce the shuffle to a single-input permutation.
6946 static SDValue lowerVectorShuffleAsBlendAndPermute(SDLoc DL, MVT VT, SDValue V1,
6949 SelectionDAG &DAG) {
6950 // We build up the blend mask while checking whether a blend is a viable way
6951 // to reduce the shuffle.
6952 SmallVector<int, 32> BlendMask(Mask.size(), -1);
6953 SmallVector<int, 32> PermuteMask(Mask.size(), -1);
6955 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6959 assert(Mask[i] < Size * 2 && "Shuffle input is out of bounds.");
6961 if (BlendMask[Mask[i] % Size] == -1)
6962 BlendMask[Mask[i] % Size] = Mask[i];
6963 else if (BlendMask[Mask[i] % Size] != Mask[i])
6964 return SDValue(); // Can't blend in the needed input!
6966 PermuteMask[i] = Mask[i] % Size;
6969 SDValue V = DAG.getVectorShuffle(VT, DL, V1, V2, BlendMask);
6970 return DAG.getVectorShuffle(VT, DL, V, DAG.getUNDEF(VT), PermuteMask);
6973 /// \brief Generic routine to decompose a shuffle and blend into indepndent
6974 /// blends and permutes.
6976 /// This matches the extremely common pattern for handling combined
6977 /// shuffle+blend operations on newer X86 ISAs where we have very fast blend
6978 /// operations. It will try to pick the best arrangement of shuffles and
6980 static SDValue lowerVectorShuffleAsDecomposedShuffleBlend(SDLoc DL, MVT VT,
6984 SelectionDAG &DAG) {
6985 // Shuffle the input elements into the desired positions in V1 and V2 and
6986 // blend them together.
6987 SmallVector<int, 32> V1Mask(Mask.size(), -1);
6988 SmallVector<int, 32> V2Mask(Mask.size(), -1);
6989 SmallVector<int, 32> BlendMask(Mask.size(), -1);
6990 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6991 if (Mask[i] >= 0 && Mask[i] < Size) {
6992 V1Mask[i] = Mask[i];
6994 } else if (Mask[i] >= Size) {
6995 V2Mask[i] = Mask[i] - Size;
6996 BlendMask[i] = i + Size;
6999 // Try to lower with the simpler initial blend strategy unless one of the
7000 // input shuffles would be a no-op. We prefer to shuffle inputs as the
7001 // shuffle may be able to fold with a load or other benefit. However, when
7002 // we'll have to do 2x as many shuffles in order to achieve this, blending
7003 // first is a better strategy.
7004 if (!isNoopShuffleMask(V1Mask) && !isNoopShuffleMask(V2Mask))
7005 if (SDValue BlendPerm =
7006 lowerVectorShuffleAsBlendAndPermute(DL, VT, V1, V2, Mask, DAG))
7009 V1 = DAG.getVectorShuffle(VT, DL, V1, DAG.getUNDEF(VT), V1Mask);
7010 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Mask);
7011 return DAG.getVectorShuffle(VT, DL, V1, V2, BlendMask);
7014 /// \brief Try to lower a vector shuffle as a byte rotation.
7016 /// SSSE3 has a generic PALIGNR instruction in x86 that will do an arbitrary
7017 /// byte-rotation of the concatenation of two vectors; pre-SSSE3 can use
7018 /// a PSRLDQ/PSLLDQ/POR pattern to get a similar effect. This routine will
7019 /// try to generically lower a vector shuffle through such an pattern. It
7020 /// does not check for the profitability of lowering either as PALIGNR or
7021 /// PSRLDQ/PSLLDQ/POR, only whether the mask is valid to lower in that form.
7022 /// This matches shuffle vectors that look like:
7024 /// v8i16 [11, 12, 13, 14, 15, 0, 1, 2]
7026 /// Essentially it concatenates V1 and V2, shifts right by some number of
7027 /// elements, and takes the low elements as the result. Note that while this is
7028 /// specified as a *right shift* because x86 is little-endian, it is a *left
7029 /// rotate* of the vector lanes.
7030 static SDValue lowerVectorShuffleAsByteRotate(SDLoc DL, MVT VT, SDValue V1,
7033 const X86Subtarget *Subtarget,
7034 SelectionDAG &DAG) {
7035 assert(!isNoopShuffleMask(Mask) && "We shouldn't lower no-op shuffles!");
7037 int NumElts = Mask.size();
7038 int NumLanes = VT.getSizeInBits() / 128;
7039 int NumLaneElts = NumElts / NumLanes;
7041 // We need to detect various ways of spelling a rotation:
7042 // [11, 12, 13, 14, 15, 0, 1, 2]
7043 // [-1, 12, 13, 14, -1, -1, 1, -1]
7044 // [-1, -1, -1, -1, -1, -1, 1, 2]
7045 // [ 3, 4, 5, 6, 7, 8, 9, 10]
7046 // [-1, 4, 5, 6, -1, -1, 9, -1]
7047 // [-1, 4, 5, 6, -1, -1, -1, -1]
7050 for (int l = 0; l < NumElts; l += NumLaneElts) {
7051 for (int i = 0; i < NumLaneElts; ++i) {
7052 if (Mask[l + i] == -1)
7054 assert(Mask[l + i] >= 0 && "Only -1 is a valid negative mask element!");
7056 // Get the mod-Size index and lane correct it.
7057 int LaneIdx = (Mask[l + i] % NumElts) - l;
7058 // Make sure it was in this lane.
7059 if (LaneIdx < 0 || LaneIdx >= NumLaneElts)
7062 // Determine where a rotated vector would have started.
7063 int StartIdx = i - LaneIdx;
7065 // The identity rotation isn't interesting, stop.
7068 // If we found the tail of a vector the rotation must be the missing
7069 // front. If we found the head of a vector, it must be how much of the
7071 int CandidateRotation = StartIdx < 0 ? -StartIdx : NumLaneElts - StartIdx;
7074 Rotation = CandidateRotation;
7075 else if (Rotation != CandidateRotation)
7076 // The rotations don't match, so we can't match this mask.
7079 // Compute which value this mask is pointing at.
7080 SDValue MaskV = Mask[l + i] < NumElts ? V1 : V2;
7082 // Compute which of the two target values this index should be assigned
7083 // to. This reflects whether the high elements are remaining or the low
7084 // elements are remaining.
7085 SDValue &TargetV = StartIdx < 0 ? Hi : Lo;
7087 // Either set up this value if we've not encountered it before, or check
7088 // that it remains consistent.
7091 else if (TargetV != MaskV)
7092 // This may be a rotation, but it pulls from the inputs in some
7093 // unsupported interleaving.
7098 // Check that we successfully analyzed the mask, and normalize the results.
7099 assert(Rotation != 0 && "Failed to locate a viable rotation!");
7100 assert((Lo || Hi) && "Failed to find a rotated input vector!");
7106 // The actual rotate instruction rotates bytes, so we need to scale the
7107 // rotation based on how many bytes are in the vector lane.
7108 int Scale = 16 / NumLaneElts;
7110 // SSSE3 targets can use the palignr instruction.
7111 if (Subtarget->hasSSSE3()) {
7112 // Cast the inputs to i8 vector of correct length to match PALIGNR.
7113 MVT AlignVT = MVT::getVectorVT(MVT::i8, 16 * NumLanes);
7114 Lo = DAG.getBitcast(AlignVT, Lo);
7115 Hi = DAG.getBitcast(AlignVT, Hi);
7117 return DAG.getBitcast(
7118 VT, DAG.getNode(X86ISD::PALIGNR, DL, AlignVT, Lo, Hi,
7119 DAG.getConstant(Rotation * Scale, DL, MVT::i8)));
7122 assert(VT.getSizeInBits() == 128 &&
7123 "Rotate-based lowering only supports 128-bit lowering!");
7124 assert(Mask.size() <= 16 &&
7125 "Can shuffle at most 16 bytes in a 128-bit vector!");
7127 // Default SSE2 implementation
7128 int LoByteShift = 16 - Rotation * Scale;
7129 int HiByteShift = Rotation * Scale;
7131 // Cast the inputs to v2i64 to match PSLLDQ/PSRLDQ.
7132 Lo = DAG.getBitcast(MVT::v2i64, Lo);
7133 Hi = DAG.getBitcast(MVT::v2i64, Hi);
7135 SDValue LoShift = DAG.getNode(X86ISD::VSHLDQ, DL, MVT::v2i64, Lo,
7136 DAG.getConstant(LoByteShift, DL, MVT::i8));
7137 SDValue HiShift = DAG.getNode(X86ISD::VSRLDQ, DL, MVT::v2i64, Hi,
7138 DAG.getConstant(HiByteShift, DL, MVT::i8));
7139 return DAG.getBitcast(VT,
7140 DAG.getNode(ISD::OR, DL, MVT::v2i64, LoShift, HiShift));
7143 /// \brief Try to lower a vector shuffle as a bit shift (shifts in zeros).
7145 /// Attempts to match a shuffle mask against the PSLL(W/D/Q/DQ) and
7146 /// PSRL(W/D/Q/DQ) SSE2 and AVX2 logical bit-shift instructions. The function
7147 /// matches elements from one of the input vectors shuffled to the left or
7148 /// right with zeroable elements 'shifted in'. It handles both the strictly
7149 /// bit-wise element shifts and the byte shift across an entire 128-bit double
7152 /// PSHL : (little-endian) left bit shift.
7153 /// [ zz, 0, zz, 2 ]
7154 /// [ -1, 4, zz, -1 ]
7155 /// PSRL : (little-endian) right bit shift.
7157 /// [ -1, -1, 7, zz]
7158 /// PSLLDQ : (little-endian) left byte shift
7159 /// [ zz, 0, 1, 2, 3, 4, 5, 6]
7160 /// [ zz, zz, -1, -1, 2, 3, 4, -1]
7161 /// [ zz, zz, zz, zz, zz, zz, -1, 1]
7162 /// PSRLDQ : (little-endian) right byte shift
7163 /// [ 5, 6, 7, zz, zz, zz, zz, zz]
7164 /// [ -1, 5, 6, 7, zz, zz, zz, zz]
7165 /// [ 1, 2, -1, -1, -1, -1, zz, zz]
7166 static SDValue lowerVectorShuffleAsShift(SDLoc DL, MVT VT, SDValue V1,
7167 SDValue V2, ArrayRef<int> Mask,
7168 SelectionDAG &DAG) {
7169 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7171 int Size = Mask.size();
7172 assert(Size == (int)VT.getVectorNumElements() && "Unexpected mask size");
7174 auto CheckZeros = [&](int Shift, int Scale, bool Left) {
7175 for (int i = 0; i < Size; i += Scale)
7176 for (int j = 0; j < Shift; ++j)
7177 if (!Zeroable[i + j + (Left ? 0 : (Scale - Shift))])
7183 auto MatchShift = [&](int Shift, int Scale, bool Left, SDValue V) {
7184 for (int i = 0; i != Size; i += Scale) {
7185 unsigned Pos = Left ? i + Shift : i;
7186 unsigned Low = Left ? i : i + Shift;
7187 unsigned Len = Scale - Shift;
7188 if (!isSequentialOrUndefInRange(Mask, Pos, Len,
7189 Low + (V == V1 ? 0 : Size)))
7193 int ShiftEltBits = VT.getScalarSizeInBits() * Scale;
7194 bool ByteShift = ShiftEltBits > 64;
7195 unsigned OpCode = Left ? (ByteShift ? X86ISD::VSHLDQ : X86ISD::VSHLI)
7196 : (ByteShift ? X86ISD::VSRLDQ : X86ISD::VSRLI);
7197 int ShiftAmt = Shift * VT.getScalarSizeInBits() / (ByteShift ? 8 : 1);
7199 // Normalize the scale for byte shifts to still produce an i64 element
7201 Scale = ByteShift ? Scale / 2 : Scale;
7203 // We need to round trip through the appropriate type for the shift.
7204 MVT ShiftSVT = MVT::getIntegerVT(VT.getScalarSizeInBits() * Scale);
7205 MVT ShiftVT = MVT::getVectorVT(ShiftSVT, Size / Scale);
7206 assert(DAG.getTargetLoweringInfo().isTypeLegal(ShiftVT) &&
7207 "Illegal integer vector type");
7208 V = DAG.getBitcast(ShiftVT, V);
7210 V = DAG.getNode(OpCode, DL, ShiftVT, V,
7211 DAG.getConstant(ShiftAmt, DL, MVT::i8));
7212 return DAG.getBitcast(VT, V);
7215 // SSE/AVX supports logical shifts up to 64-bit integers - so we can just
7216 // keep doubling the size of the integer elements up to that. We can
7217 // then shift the elements of the integer vector by whole multiples of
7218 // their width within the elements of the larger integer vector. Test each
7219 // multiple to see if we can find a match with the moved element indices
7220 // and that the shifted in elements are all zeroable.
7221 for (int Scale = 2; Scale * VT.getScalarSizeInBits() <= 128; Scale *= 2)
7222 for (int Shift = 1; Shift != Scale; ++Shift)
7223 for (bool Left : {true, false})
7224 if (CheckZeros(Shift, Scale, Left))
7225 for (SDValue V : {V1, V2})
7226 if (SDValue Match = MatchShift(Shift, Scale, Left, V))
7233 /// \brief Try to lower a vector shuffle using SSE4a EXTRQ/INSERTQ.
7234 static SDValue lowerVectorShuffleWithSSE4A(SDLoc DL, MVT VT, SDValue V1,
7235 SDValue V2, ArrayRef<int> Mask,
7236 SelectionDAG &DAG) {
7237 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7238 assert(!Zeroable.all() && "Fully zeroable shuffle mask");
7240 int Size = Mask.size();
7241 int HalfSize = Size / 2;
7242 assert(Size == (int)VT.getVectorNumElements() && "Unexpected mask size");
7244 // Upper half must be undefined.
7245 if (!isUndefInRange(Mask, HalfSize, HalfSize))
7248 // EXTRQ: Extract Len elements from lower half of source, starting at Idx.
7249 // Remainder of lower half result is zero and upper half is all undef.
7250 auto LowerAsEXTRQ = [&]() {
7251 // Determine the extraction length from the part of the
7252 // lower half that isn't zeroable.
7254 for (; Len >= 0; --Len)
7255 if (!Zeroable[Len - 1])
7257 assert(Len > 0 && "Zeroable shuffle mask");
7259 // Attempt to match first Len sequential elements from the lower half.
7262 for (int i = 0; i != Len; ++i) {
7266 SDValue &V = (M < Size ? V1 : V2);
7269 // All mask elements must be in the lower half.
7273 if (Idx < 0 || (Src == V && Idx == (M - i))) {
7284 assert((Idx + Len) <= HalfSize && "Illegal extraction mask");
7285 int BitLen = (Len * VT.getScalarSizeInBits()) & 0x3f;
7286 int BitIdx = (Idx * VT.getScalarSizeInBits()) & 0x3f;
7287 return DAG.getNode(X86ISD::EXTRQI, DL, VT, Src,
7288 DAG.getConstant(BitLen, DL, MVT::i8),
7289 DAG.getConstant(BitIdx, DL, MVT::i8));
7292 if (SDValue ExtrQ = LowerAsEXTRQ())
7295 // INSERTQ: Extract lowest Len elements from lower half of second source and
7296 // insert over first source, starting at Idx.
7297 // { A[0], .., A[Idx-1], B[0], .., B[Len-1], A[Idx+Len], .., UNDEF, ... }
7298 auto LowerAsInsertQ = [&]() {
7299 for (int Idx = 0; Idx != HalfSize; ++Idx) {
7302 // Attempt to match first source from mask before insertion point.
7303 if (isUndefInRange(Mask, 0, Idx)) {
7305 } else if (isSequentialOrUndefInRange(Mask, 0, Idx, 0)) {
7307 } else if (isSequentialOrUndefInRange(Mask, 0, Idx, Size)) {
7313 // Extend the extraction length looking to match both the insertion of
7314 // the second source and the remaining elements of the first.
7315 for (int Hi = Idx + 1; Hi <= HalfSize; ++Hi) {
7320 if (isSequentialOrUndefInRange(Mask, Idx, Len, 0)) {
7322 } else if (isSequentialOrUndefInRange(Mask, Idx, Len, Size)) {
7328 // Match the remaining elements of the lower half.
7329 if (isUndefInRange(Mask, Hi, HalfSize - Hi)) {
7331 } else if ((!Base || (Base == V1)) &&
7332 isSequentialOrUndefInRange(Mask, Hi, HalfSize - Hi, Hi)) {
7334 } else if ((!Base || (Base == V2)) &&
7335 isSequentialOrUndefInRange(Mask, Hi, HalfSize - Hi,
7342 // We may not have a base (first source) - this can safely be undefined.
7344 Base = DAG.getUNDEF(VT);
7346 int BitLen = (Len * VT.getScalarSizeInBits()) & 0x3f;
7347 int BitIdx = (Idx * VT.getScalarSizeInBits()) & 0x3f;
7348 return DAG.getNode(X86ISD::INSERTQI, DL, VT, Base, Insert,
7349 DAG.getConstant(BitLen, DL, MVT::i8),
7350 DAG.getConstant(BitIdx, DL, MVT::i8));
7357 if (SDValue InsertQ = LowerAsInsertQ())
7363 /// \brief Lower a vector shuffle as a zero or any extension.
7365 /// Given a specific number of elements, element bit width, and extension
7366 /// stride, produce either a zero or any extension based on the available
7367 /// features of the subtarget. The extended elements are consecutive and
7368 /// begin and can start from an offseted element index in the input; to
7369 /// avoid excess shuffling the offset must either being in the bottom lane
7370 /// or at the start of a higher lane. All extended elements must be from
7372 static SDValue lowerVectorShuffleAsSpecificZeroOrAnyExtend(
7373 SDLoc DL, MVT VT, int Scale, int Offset, bool AnyExt, SDValue InputV,
7374 ArrayRef<int> Mask, const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7375 assert(Scale > 1 && "Need a scale to extend.");
7376 int EltBits = VT.getScalarSizeInBits();
7377 int NumElements = VT.getVectorNumElements();
7378 int NumEltsPerLane = 128 / EltBits;
7379 int OffsetLane = Offset / NumEltsPerLane;
7380 assert((EltBits == 8 || EltBits == 16 || EltBits == 32) &&
7381 "Only 8, 16, and 32 bit elements can be extended.");
7382 assert(Scale * EltBits <= 64 && "Cannot zero extend past 64 bits.");
7383 assert(0 <= Offset && "Extension offset must be positive.");
7384 assert((Offset < NumEltsPerLane || Offset % NumEltsPerLane == 0) &&
7385 "Extension offset must be in the first lane or start an upper lane.");
7387 // Check that an index is in same lane as the base offset.
7388 auto SafeOffset = [&](int Idx) {
7389 return OffsetLane == (Idx / NumEltsPerLane);
7392 // Shift along an input so that the offset base moves to the first element.
7393 auto ShuffleOffset = [&](SDValue V) {
7397 SmallVector<int, 8> ShMask((unsigned)NumElements, -1);
7398 for (int i = 0; i * Scale < NumElements; ++i) {
7399 int SrcIdx = i + Offset;
7400 ShMask[i] = SafeOffset(SrcIdx) ? SrcIdx : -1;
7402 return DAG.getVectorShuffle(VT, DL, V, DAG.getUNDEF(VT), ShMask);
7405 // Found a valid zext mask! Try various lowering strategies based on the
7406 // input type and available ISA extensions.
7407 if (Subtarget->hasSSE41()) {
7408 // Not worth offseting 128-bit vectors if scale == 2, a pattern using
7409 // PUNPCK will catch this in a later shuffle match.
7410 if (Offset && Scale == 2 && VT.getSizeInBits() == 128)
7412 MVT ExtVT = MVT::getVectorVT(MVT::getIntegerVT(EltBits * Scale),
7413 NumElements / Scale);
7414 InputV = DAG.getNode(X86ISD::VZEXT, DL, ExtVT, ShuffleOffset(InputV));
7415 return DAG.getBitcast(VT, InputV);
7418 assert(VT.getSizeInBits() == 128 && "Only 128-bit vectors can be extended.");
7420 // For any extends we can cheat for larger element sizes and use shuffle
7421 // instructions that can fold with a load and/or copy.
7422 if (AnyExt && EltBits == 32) {
7423 int PSHUFDMask[4] = {Offset, -1, SafeOffset(Offset + 1) ? Offset + 1 : -1,
7425 return DAG.getBitcast(
7426 VT, DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32,
7427 DAG.getBitcast(MVT::v4i32, InputV),
7428 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
7430 if (AnyExt && EltBits == 16 && Scale > 2) {
7431 int PSHUFDMask[4] = {Offset / 2, -1,
7432 SafeOffset(Offset + 1) ? (Offset + 1) / 2 : -1, -1};
7433 InputV = DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32,
7434 DAG.getBitcast(MVT::v4i32, InputV),
7435 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG));
7436 int PSHUFWMask[4] = {1, -1, -1, -1};
7437 unsigned OddEvenOp = (Offset & 1 ? X86ISD::PSHUFLW : X86ISD::PSHUFHW);
7438 return DAG.getBitcast(
7439 VT, DAG.getNode(OddEvenOp, DL, MVT::v8i16,
7440 DAG.getBitcast(MVT::v8i16, InputV),
7441 getV4X86ShuffleImm8ForMask(PSHUFWMask, DL, DAG)));
7444 // The SSE4A EXTRQ instruction can efficiently extend the first 2 lanes
7446 if ((Scale * EltBits) == 64 && EltBits < 32 && Subtarget->hasSSE4A()) {
7447 assert(NumElements == (int)Mask.size() && "Unexpected shuffle mask size!");
7448 assert(VT.getSizeInBits() == 128 && "Unexpected vector width!");
7450 int LoIdx = Offset * EltBits;
7451 SDValue Lo = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64,
7452 DAG.getNode(X86ISD::EXTRQI, DL, VT, InputV,
7453 DAG.getConstant(EltBits, DL, MVT::i8),
7454 DAG.getConstant(LoIdx, DL, MVT::i8)));
7456 if (isUndefInRange(Mask, NumElements / 2, NumElements / 2) ||
7457 !SafeOffset(Offset + 1))
7458 return DAG.getNode(ISD::BITCAST, DL, VT, Lo);
7460 int HiIdx = (Offset + 1) * EltBits;
7461 SDValue Hi = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64,
7462 DAG.getNode(X86ISD::EXTRQI, DL, VT, InputV,
7463 DAG.getConstant(EltBits, DL, MVT::i8),
7464 DAG.getConstant(HiIdx, DL, MVT::i8)));
7465 return DAG.getNode(ISD::BITCAST, DL, VT,
7466 DAG.getNode(X86ISD::UNPCKL, DL, MVT::v2i64, Lo, Hi));
7469 // If this would require more than 2 unpack instructions to expand, use
7470 // pshufb when available. We can only use more than 2 unpack instructions
7471 // when zero extending i8 elements which also makes it easier to use pshufb.
7472 if (Scale > 4 && EltBits == 8 && Subtarget->hasSSSE3()) {
7473 assert(NumElements == 16 && "Unexpected byte vector width!");
7474 SDValue PSHUFBMask[16];
7475 for (int i = 0; i < 16; ++i) {
7476 int Idx = Offset + (i / Scale);
7477 PSHUFBMask[i] = DAG.getConstant(
7478 (i % Scale == 0 && SafeOffset(Idx)) ? Idx : 0x80, DL, MVT::i8);
7480 InputV = DAG.getBitcast(MVT::v16i8, InputV);
7481 return DAG.getBitcast(VT,
7482 DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8, InputV,
7483 DAG.getNode(ISD::BUILD_VECTOR, DL,
7484 MVT::v16i8, PSHUFBMask)));
7487 // If we are extending from an offset, ensure we start on a boundary that
7488 // we can unpack from.
7489 int AlignToUnpack = Offset % (NumElements / Scale);
7490 if (AlignToUnpack) {
7491 SmallVector<int, 8> ShMask((unsigned)NumElements, -1);
7492 for (int i = AlignToUnpack; i < NumElements; ++i)
7493 ShMask[i - AlignToUnpack] = i;
7494 InputV = DAG.getVectorShuffle(VT, DL, InputV, DAG.getUNDEF(VT), ShMask);
7495 Offset -= AlignToUnpack;
7498 // Otherwise emit a sequence of unpacks.
7500 unsigned UnpackLoHi = X86ISD::UNPCKL;
7501 if (Offset >= (NumElements / 2)) {
7502 UnpackLoHi = X86ISD::UNPCKH;
7503 Offset -= (NumElements / 2);
7506 MVT InputVT = MVT::getVectorVT(MVT::getIntegerVT(EltBits), NumElements);
7507 SDValue Ext = AnyExt ? DAG.getUNDEF(InputVT)
7508 : getZeroVector(InputVT, Subtarget, DAG, DL);
7509 InputV = DAG.getBitcast(InputVT, InputV);
7510 InputV = DAG.getNode(UnpackLoHi, DL, InputVT, InputV, Ext);
7514 } while (Scale > 1);
7515 return DAG.getBitcast(VT, InputV);
7518 /// \brief Try to lower a vector shuffle as a zero extension on any microarch.
7520 /// This routine will try to do everything in its power to cleverly lower
7521 /// a shuffle which happens to match the pattern of a zero extend. It doesn't
7522 /// check for the profitability of this lowering, it tries to aggressively
7523 /// match this pattern. It will use all of the micro-architectural details it
7524 /// can to emit an efficient lowering. It handles both blends with all-zero
7525 /// inputs to explicitly zero-extend and undef-lanes (sometimes undef due to
7526 /// masking out later).
7528 /// The reason we have dedicated lowering for zext-style shuffles is that they
7529 /// are both incredibly common and often quite performance sensitive.
7530 static SDValue lowerVectorShuffleAsZeroOrAnyExtend(
7531 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
7532 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7533 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7535 int Bits = VT.getSizeInBits();
7536 int NumLanes = Bits / 128;
7537 int NumElements = VT.getVectorNumElements();
7538 int NumEltsPerLane = NumElements / NumLanes;
7539 assert(VT.getScalarSizeInBits() <= 32 &&
7540 "Exceeds 32-bit integer zero extension limit");
7541 assert((int)Mask.size() == NumElements && "Unexpected shuffle mask size");
7543 // Define a helper function to check a particular ext-scale and lower to it if
7545 auto Lower = [&](int Scale) -> SDValue {
7550 for (int i = 0; i < NumElements; ++i) {
7553 continue; // Valid anywhere but doesn't tell us anything.
7554 if (i % Scale != 0) {
7555 // Each of the extended elements need to be zeroable.
7559 // We no longer are in the anyext case.
7564 // Each of the base elements needs to be consecutive indices into the
7565 // same input vector.
7566 SDValue V = M < NumElements ? V1 : V2;
7567 M = M % NumElements;
7570 Offset = M - (i / Scale);
7571 } else if (InputV != V)
7572 return SDValue(); // Flip-flopping inputs.
7574 // Offset must start in the lowest 128-bit lane or at the start of an
7576 // FIXME: Is it ever worth allowing a negative base offset?
7577 if (!((0 <= Offset && Offset < NumEltsPerLane) ||
7578 (Offset % NumEltsPerLane) == 0))
7581 // If we are offsetting, all referenced entries must come from the same
7583 if (Offset && (Offset / NumEltsPerLane) != (M / NumEltsPerLane))
7586 if ((M % NumElements) != (Offset + (i / Scale)))
7587 return SDValue(); // Non-consecutive strided elements.
7591 // If we fail to find an input, we have a zero-shuffle which should always
7592 // have already been handled.
7593 // FIXME: Maybe handle this here in case during blending we end up with one?
7597 // If we are offsetting, don't extend if we only match a single input, we
7598 // can always do better by using a basic PSHUF or PUNPCK.
7599 if (Offset != 0 && Matches < 2)
7602 return lowerVectorShuffleAsSpecificZeroOrAnyExtend(
7603 DL, VT, Scale, Offset, AnyExt, InputV, Mask, Subtarget, DAG);
7606 // The widest scale possible for extending is to a 64-bit integer.
7607 assert(Bits % 64 == 0 &&
7608 "The number of bits in a vector must be divisible by 64 on x86!");
7609 int NumExtElements = Bits / 64;
7611 // Each iteration, try extending the elements half as much, but into twice as
7613 for (; NumExtElements < NumElements; NumExtElements *= 2) {
7614 assert(NumElements % NumExtElements == 0 &&
7615 "The input vector size must be divisible by the extended size.");
7616 if (SDValue V = Lower(NumElements / NumExtElements))
7620 // General extends failed, but 128-bit vectors may be able to use MOVQ.
7624 // Returns one of the source operands if the shuffle can be reduced to a
7625 // MOVQ, copying the lower 64-bits and zero-extending to the upper 64-bits.
7626 auto CanZExtLowHalf = [&]() {
7627 for (int i = NumElements / 2; i != NumElements; ++i)
7630 if (isSequentialOrUndefInRange(Mask, 0, NumElements / 2, 0))
7632 if (isSequentialOrUndefInRange(Mask, 0, NumElements / 2, NumElements))
7637 if (SDValue V = CanZExtLowHalf()) {
7638 V = DAG.getBitcast(MVT::v2i64, V);
7639 V = DAG.getNode(X86ISD::VZEXT_MOVL, DL, MVT::v2i64, V);
7640 return DAG.getBitcast(VT, V);
7643 // No viable ext lowering found.
7647 /// \brief Try to get a scalar value for a specific element of a vector.
7649 /// Looks through BUILD_VECTOR and SCALAR_TO_VECTOR nodes to find a scalar.
7650 static SDValue getScalarValueForVectorElement(SDValue V, int Idx,
7651 SelectionDAG &DAG) {
7652 MVT VT = V.getSimpleValueType();
7653 MVT EltVT = VT.getVectorElementType();
7654 while (V.getOpcode() == ISD::BITCAST)
7655 V = V.getOperand(0);
7656 // If the bitcasts shift the element size, we can't extract an equivalent
7658 MVT NewVT = V.getSimpleValueType();
7659 if (!NewVT.isVector() || NewVT.getScalarSizeInBits() != VT.getScalarSizeInBits())
7662 if (V.getOpcode() == ISD::BUILD_VECTOR ||
7663 (Idx == 0 && V.getOpcode() == ISD::SCALAR_TO_VECTOR)) {
7664 // Ensure the scalar operand is the same size as the destination.
7665 // FIXME: Add support for scalar truncation where possible.
7666 SDValue S = V.getOperand(Idx);
7667 if (EltVT.getSizeInBits() == S.getSimpleValueType().getSizeInBits())
7668 return DAG.getNode(ISD::BITCAST, SDLoc(V), EltVT, S);
7674 /// \brief Helper to test for a load that can be folded with x86 shuffles.
7676 /// This is particularly important because the set of instructions varies
7677 /// significantly based on whether the operand is a load or not.
7678 static bool isShuffleFoldableLoad(SDValue V) {
7679 while (V.getOpcode() == ISD::BITCAST)
7680 V = V.getOperand(0);
7682 return ISD::isNON_EXTLoad(V.getNode());
7685 /// \brief Try to lower insertion of a single element into a zero vector.
7687 /// This is a common pattern that we have especially efficient patterns to lower
7688 /// across all subtarget feature sets.
7689 static SDValue lowerVectorShuffleAsElementInsertion(
7690 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
7691 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7692 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7694 MVT EltVT = VT.getVectorElementType();
7696 int V2Index = std::find_if(Mask.begin(), Mask.end(),
7697 [&Mask](int M) { return M >= (int)Mask.size(); }) -
7699 bool IsV1Zeroable = true;
7700 for (int i = 0, Size = Mask.size(); i < Size; ++i)
7701 if (i != V2Index && !Zeroable[i]) {
7702 IsV1Zeroable = false;
7706 // Check for a single input from a SCALAR_TO_VECTOR node.
7707 // FIXME: All of this should be canonicalized into INSERT_VECTOR_ELT and
7708 // all the smarts here sunk into that routine. However, the current
7709 // lowering of BUILD_VECTOR makes that nearly impossible until the old
7710 // vector shuffle lowering is dead.
7711 SDValue V2S = getScalarValueForVectorElement(V2, Mask[V2Index] - Mask.size(),
7713 if (V2S && DAG.getTargetLoweringInfo().isTypeLegal(V2S.getValueType())) {
7714 // We need to zext the scalar if it is smaller than an i32.
7715 V2S = DAG.getBitcast(EltVT, V2S);
7716 if (EltVT == MVT::i8 || EltVT == MVT::i16) {
7717 // Using zext to expand a narrow element won't work for non-zero
7722 // Zero-extend directly to i32.
7724 V2S = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i32, V2S);
7726 V2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, ExtVT, V2S);
7727 } else if (Mask[V2Index] != (int)Mask.size() || EltVT == MVT::i8 ||
7728 EltVT == MVT::i16) {
7729 // Either not inserting from the low element of the input or the input
7730 // element size is too small to use VZEXT_MOVL to clear the high bits.
7734 if (!IsV1Zeroable) {
7735 // If V1 can't be treated as a zero vector we have fewer options to lower
7736 // this. We can't support integer vectors or non-zero targets cheaply, and
7737 // the V1 elements can't be permuted in any way.
7738 assert(VT == ExtVT && "Cannot change extended type when non-zeroable!");
7739 if (!VT.isFloatingPoint() || V2Index != 0)
7741 SmallVector<int, 8> V1Mask(Mask.begin(), Mask.end());
7742 V1Mask[V2Index] = -1;
7743 if (!isNoopShuffleMask(V1Mask))
7745 // This is essentially a special case blend operation, but if we have
7746 // general purpose blend operations, they are always faster. Bail and let
7747 // the rest of the lowering handle these as blends.
7748 if (Subtarget->hasSSE41())
7751 // Otherwise, use MOVSD or MOVSS.
7752 assert((EltVT == MVT::f32 || EltVT == MVT::f64) &&
7753 "Only two types of floating point element types to handle!");
7754 return DAG.getNode(EltVT == MVT::f32 ? X86ISD::MOVSS : X86ISD::MOVSD, DL,
7758 // This lowering only works for the low element with floating point vectors.
7759 if (VT.isFloatingPoint() && V2Index != 0)
7762 V2 = DAG.getNode(X86ISD::VZEXT_MOVL, DL, ExtVT, V2);
7764 V2 = DAG.getBitcast(VT, V2);
7767 // If we have 4 or fewer lanes we can cheaply shuffle the element into
7768 // the desired position. Otherwise it is more efficient to do a vector
7769 // shift left. We know that we can do a vector shift left because all
7770 // the inputs are zero.
7771 if (VT.isFloatingPoint() || VT.getVectorNumElements() <= 4) {
7772 SmallVector<int, 4> V2Shuffle(Mask.size(), 1);
7773 V2Shuffle[V2Index] = 0;
7774 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Shuffle);
7776 V2 = DAG.getBitcast(MVT::v2i64, V2);
7778 X86ISD::VSHLDQ, DL, MVT::v2i64, V2,
7779 DAG.getConstant(V2Index * EltVT.getSizeInBits() / 8, DL,
7780 DAG.getTargetLoweringInfo().getScalarShiftAmountTy(
7781 DAG.getDataLayout(), VT)));
7782 V2 = DAG.getBitcast(VT, V2);
7788 /// \brief Try to lower broadcast of a single element.
7790 /// For convenience, this code also bundles all of the subtarget feature set
7791 /// filtering. While a little annoying to re-dispatch on type here, there isn't
7792 /// a convenient way to factor it out.
7793 static SDValue lowerVectorShuffleAsBroadcast(SDLoc DL, MVT VT, SDValue V,
7795 const X86Subtarget *Subtarget,
7796 SelectionDAG &DAG) {
7797 if (!Subtarget->hasAVX())
7799 if (VT.isInteger() && !Subtarget->hasAVX2())
7802 // Check that the mask is a broadcast.
7803 int BroadcastIdx = -1;
7805 if (M >= 0 && BroadcastIdx == -1)
7807 else if (M >= 0 && M != BroadcastIdx)
7810 assert(BroadcastIdx < (int)Mask.size() && "We only expect to be called with "
7811 "a sorted mask where the broadcast "
7814 // Go up the chain of (vector) values to find a scalar load that we can
7815 // combine with the broadcast.
7817 switch (V.getOpcode()) {
7818 case ISD::CONCAT_VECTORS: {
7819 int OperandSize = Mask.size() / V.getNumOperands();
7820 V = V.getOperand(BroadcastIdx / OperandSize);
7821 BroadcastIdx %= OperandSize;
7825 case ISD::INSERT_SUBVECTOR: {
7826 SDValue VOuter = V.getOperand(0), VInner = V.getOperand(1);
7827 auto ConstantIdx = dyn_cast<ConstantSDNode>(V.getOperand(2));
7831 int BeginIdx = (int)ConstantIdx->getZExtValue();
7833 BeginIdx + (int)VInner.getValueType().getVectorNumElements();
7834 if (BroadcastIdx >= BeginIdx && BroadcastIdx < EndIdx) {
7835 BroadcastIdx -= BeginIdx;
7846 // Check if this is a broadcast of a scalar. We special case lowering
7847 // for scalars so that we can more effectively fold with loads.
7848 // First, look through bitcast: if the original value has a larger element
7849 // type than the shuffle, the broadcast element is in essence truncated.
7850 // Make that explicit to ease folding.
7851 if (V.getOpcode() == ISD::BITCAST && VT.isInteger()) {
7852 EVT EltVT = VT.getVectorElementType();
7853 SDValue V0 = V.getOperand(0);
7854 EVT V0VT = V0.getValueType();
7856 if (V0VT.isInteger() && V0VT.getVectorElementType().bitsGT(EltVT) &&
7857 ((V0.getOpcode() == ISD::BUILD_VECTOR ||
7858 (V0.getOpcode() == ISD::SCALAR_TO_VECTOR && BroadcastIdx == 0)))) {
7859 V = DAG.getNode(ISD::TRUNCATE, DL, EltVT, V0.getOperand(BroadcastIdx));
7864 // Also check the simpler case, where we can directly reuse the scalar.
7865 if (V.getOpcode() == ISD::BUILD_VECTOR ||
7866 (V.getOpcode() == ISD::SCALAR_TO_VECTOR && BroadcastIdx == 0)) {
7867 V = V.getOperand(BroadcastIdx);
7869 // If the scalar isn't a load, we can't broadcast from it in AVX1.
7870 // Only AVX2 has register broadcasts.
7871 if (!Subtarget->hasAVX2() && !isShuffleFoldableLoad(V))
7873 } else if (BroadcastIdx != 0 || !Subtarget->hasAVX2()) {
7874 // We can't broadcast from a vector register without AVX2, and we can only
7875 // broadcast from the zero-element of a vector register.
7879 return DAG.getNode(X86ISD::VBROADCAST, DL, VT, V);
7882 // Check for whether we can use INSERTPS to perform the shuffle. We only use
7883 // INSERTPS when the V1 elements are already in the correct locations
7884 // because otherwise we can just always use two SHUFPS instructions which
7885 // are much smaller to encode than a SHUFPS and an INSERTPS. We can also
7886 // perform INSERTPS if a single V1 element is out of place and all V2
7887 // elements are zeroable.
7888 static SDValue lowerVectorShuffleAsInsertPS(SDValue Op, SDValue V1, SDValue V2,
7890 SelectionDAG &DAG) {
7891 assert(Op.getSimpleValueType() == MVT::v4f32 && "Bad shuffle type!");
7892 assert(V1.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
7893 assert(V2.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
7894 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
7896 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7899 int V1DstIndex = -1;
7900 int V2DstIndex = -1;
7901 bool V1UsedInPlace = false;
7903 for (int i = 0; i < 4; ++i) {
7904 // Synthesize a zero mask from the zeroable elements (includes undefs).
7910 // Flag if we use any V1 inputs in place.
7912 V1UsedInPlace = true;
7916 // We can only insert a single non-zeroable element.
7917 if (V1DstIndex != -1 || V2DstIndex != -1)
7921 // V1 input out of place for insertion.
7924 // V2 input for insertion.
7929 // Don't bother if we have no (non-zeroable) element for insertion.
7930 if (V1DstIndex == -1 && V2DstIndex == -1)
7933 // Determine element insertion src/dst indices. The src index is from the
7934 // start of the inserted vector, not the start of the concatenated vector.
7935 unsigned V2SrcIndex = 0;
7936 if (V1DstIndex != -1) {
7937 // If we have a V1 input out of place, we use V1 as the V2 element insertion
7938 // and don't use the original V2 at all.
7939 V2SrcIndex = Mask[V1DstIndex];
7940 V2DstIndex = V1DstIndex;
7943 V2SrcIndex = Mask[V2DstIndex] - 4;
7946 // If no V1 inputs are used in place, then the result is created only from
7947 // the zero mask and the V2 insertion - so remove V1 dependency.
7949 V1 = DAG.getUNDEF(MVT::v4f32);
7951 unsigned InsertPSMask = V2SrcIndex << 6 | V2DstIndex << 4 | ZMask;
7952 assert((InsertPSMask & ~0xFFu) == 0 && "Invalid mask!");
7954 // Insert the V2 element into the desired position.
7956 return DAG.getNode(X86ISD::INSERTPS, DL, MVT::v4f32, V1, V2,
7957 DAG.getConstant(InsertPSMask, DL, MVT::i8));
7960 /// \brief Try to lower a shuffle as a permute of the inputs followed by an
7961 /// UNPCK instruction.
7963 /// This specifically targets cases where we end up with alternating between
7964 /// the two inputs, and so can permute them into something that feeds a single
7965 /// UNPCK instruction. Note that this routine only targets integer vectors
7966 /// because for floating point vectors we have a generalized SHUFPS lowering
7967 /// strategy that handles everything that doesn't *exactly* match an unpack,
7968 /// making this clever lowering unnecessary.
7969 static SDValue lowerVectorShuffleAsPermuteAndUnpack(SDLoc DL, MVT VT,
7970 SDValue V1, SDValue V2,
7972 SelectionDAG &DAG) {
7973 assert(!VT.isFloatingPoint() &&
7974 "This routine only supports integer vectors.");
7975 assert(!isSingleInputShuffleMask(Mask) &&
7976 "This routine should only be used when blending two inputs.");
7977 assert(Mask.size() >= 2 && "Single element masks are invalid.");
7979 int Size = Mask.size();
7981 int NumLoInputs = std::count_if(Mask.begin(), Mask.end(), [Size](int M) {
7982 return M >= 0 && M % Size < Size / 2;
7984 int NumHiInputs = std::count_if(
7985 Mask.begin(), Mask.end(), [Size](int M) { return M % Size >= Size / 2; });
7987 bool UnpackLo = NumLoInputs >= NumHiInputs;
7989 auto TryUnpack = [&](MVT UnpackVT, int Scale) {
7990 SmallVector<int, 32> V1Mask(Mask.size(), -1);
7991 SmallVector<int, 32> V2Mask(Mask.size(), -1);
7993 for (int i = 0; i < Size; ++i) {
7997 // Each element of the unpack contains Scale elements from this mask.
7998 int UnpackIdx = i / Scale;
8000 // We only handle the case where V1 feeds the first slots of the unpack.
8001 // We rely on canonicalization to ensure this is the case.
8002 if ((UnpackIdx % 2 == 0) != (Mask[i] < Size))
8005 // Setup the mask for this input. The indexing is tricky as we have to
8006 // handle the unpack stride.
8007 SmallVectorImpl<int> &VMask = (UnpackIdx % 2 == 0) ? V1Mask : V2Mask;
8008 VMask[(UnpackIdx / 2) * Scale + i % Scale + (UnpackLo ? 0 : Size / 2)] =
8012 // If we will have to shuffle both inputs to use the unpack, check whether
8013 // we can just unpack first and shuffle the result. If so, skip this unpack.
8014 if ((NumLoInputs == 0 || NumHiInputs == 0) && !isNoopShuffleMask(V1Mask) &&
8015 !isNoopShuffleMask(V2Mask))
8018 // Shuffle the inputs into place.
8019 V1 = DAG.getVectorShuffle(VT, DL, V1, DAG.getUNDEF(VT), V1Mask);
8020 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Mask);
8022 // Cast the inputs to the type we will use to unpack them.
8023 V1 = DAG.getBitcast(UnpackVT, V1);
8024 V2 = DAG.getBitcast(UnpackVT, V2);
8026 // Unpack the inputs and cast the result back to the desired type.
8027 return DAG.getBitcast(
8028 VT, DAG.getNode(UnpackLo ? X86ISD::UNPCKL : X86ISD::UNPCKH, DL,
8032 // We try each unpack from the largest to the smallest to try and find one
8033 // that fits this mask.
8034 int OrigNumElements = VT.getVectorNumElements();
8035 int OrigScalarSize = VT.getScalarSizeInBits();
8036 for (int ScalarSize = 64; ScalarSize >= OrigScalarSize; ScalarSize /= 2) {
8037 int Scale = ScalarSize / OrigScalarSize;
8038 int NumElements = OrigNumElements / Scale;
8039 MVT UnpackVT = MVT::getVectorVT(MVT::getIntegerVT(ScalarSize), NumElements);
8040 if (SDValue Unpack = TryUnpack(UnpackVT, Scale))
8044 // If none of the unpack-rooted lowerings worked (or were profitable) try an
8046 if (NumLoInputs == 0 || NumHiInputs == 0) {
8047 assert((NumLoInputs > 0 || NumHiInputs > 0) &&
8048 "We have to have *some* inputs!");
8049 int HalfOffset = NumLoInputs == 0 ? Size / 2 : 0;
8051 // FIXME: We could consider the total complexity of the permute of each
8052 // possible unpacking. Or at the least we should consider how many
8053 // half-crossings are created.
8054 // FIXME: We could consider commuting the unpacks.
8056 SmallVector<int, 32> PermMask;
8057 PermMask.assign(Size, -1);
8058 for (int i = 0; i < Size; ++i) {
8062 assert(Mask[i] % Size >= HalfOffset && "Found input from wrong half!");
8065 2 * ((Mask[i] % Size) - HalfOffset) + (Mask[i] < Size ? 0 : 1);
8067 return DAG.getVectorShuffle(
8068 VT, DL, DAG.getNode(NumLoInputs == 0 ? X86ISD::UNPCKH : X86ISD::UNPCKL,
8070 DAG.getUNDEF(VT), PermMask);
8076 /// \brief Handle lowering of 2-lane 64-bit floating point shuffles.
8078 /// This is the basis function for the 2-lane 64-bit shuffles as we have full
8079 /// support for floating point shuffles but not integer shuffles. These
8080 /// instructions will incur a domain crossing penalty on some chips though so
8081 /// it is better to avoid lowering through this for integer vectors where
8083 static SDValue lowerV2F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8084 const X86Subtarget *Subtarget,
8085 SelectionDAG &DAG) {
8087 assert(Op.getSimpleValueType() == MVT::v2f64 && "Bad shuffle type!");
8088 assert(V1.getSimpleValueType() == MVT::v2f64 && "Bad operand type!");
8089 assert(V2.getSimpleValueType() == MVT::v2f64 && "Bad operand type!");
8090 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8091 ArrayRef<int> Mask = SVOp->getMask();
8092 assert(Mask.size() == 2 && "Unexpected mask size for v2 shuffle!");
8094 if (isSingleInputShuffleMask(Mask)) {
8095 // Use low duplicate instructions for masks that match their pattern.
8096 if (Subtarget->hasSSE3())
8097 if (isShuffleEquivalent(V1, V2, Mask, {0, 0}))
8098 return DAG.getNode(X86ISD::MOVDDUP, DL, MVT::v2f64, V1);
8100 // Straight shuffle of a single input vector. Simulate this by using the
8101 // single input as both of the "inputs" to this instruction..
8102 unsigned SHUFPDMask = (Mask[0] == 1) | ((Mask[1] == 1) << 1);
8104 if (Subtarget->hasAVX()) {
8105 // If we have AVX, we can use VPERMILPS which will allow folding a load
8106 // into the shuffle.
8107 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v2f64, V1,
8108 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8111 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v2f64, V1, V1,
8112 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8114 assert(Mask[0] >= 0 && Mask[0] < 2 && "Non-canonicalized blend!");
8115 assert(Mask[1] >= 2 && "Non-canonicalized blend!");
8117 // If we have a single input, insert that into V1 if we can do so cheaply.
8118 if ((Mask[0] >= 2) + (Mask[1] >= 2) == 1) {
8119 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8120 DL, MVT::v2f64, V1, V2, Mask, Subtarget, DAG))
8122 // Try inverting the insertion since for v2 masks it is easy to do and we
8123 // can't reliably sort the mask one way or the other.
8124 int InverseMask[2] = {Mask[0] < 0 ? -1 : (Mask[0] ^ 2),
8125 Mask[1] < 0 ? -1 : (Mask[1] ^ 2)};
8126 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8127 DL, MVT::v2f64, V2, V1, InverseMask, Subtarget, DAG))
8131 // Try to use one of the special instruction patterns to handle two common
8132 // blend patterns if a zero-blend above didn't work.
8133 if (isShuffleEquivalent(V1, V2, Mask, {0, 3}) ||
8134 isShuffleEquivalent(V1, V2, Mask, {1, 3}))
8135 if (SDValue V1S = getScalarValueForVectorElement(V1, Mask[0], DAG))
8136 // We can either use a special instruction to load over the low double or
8137 // to move just the low double.
8139 isShuffleFoldableLoad(V1S) ? X86ISD::MOVLPD : X86ISD::MOVSD,
8141 DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, MVT::v2f64, V1S));
8143 if (Subtarget->hasSSE41())
8144 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v2f64, V1, V2, Mask,
8148 // Use dedicated unpack instructions for masks that match their pattern.
8149 if (isShuffleEquivalent(V1, V2, Mask, {0, 2}))
8150 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v2f64, V1, V2);
8151 if (isShuffleEquivalent(V1, V2, Mask, {1, 3}))
8152 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v2f64, V1, V2);
8154 unsigned SHUFPDMask = (Mask[0] == 1) | (((Mask[1] - 2) == 1) << 1);
8155 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v2f64, V1, V2,
8156 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8159 /// \brief Handle lowering of 2-lane 64-bit integer shuffles.
8161 /// Tries to lower a 2-lane 64-bit shuffle using shuffle operations provided by
8162 /// the integer unit to minimize domain crossing penalties. However, for blends
8163 /// it falls back to the floating point shuffle operation with appropriate bit
8165 static SDValue lowerV2I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8166 const X86Subtarget *Subtarget,
8167 SelectionDAG &DAG) {
8169 assert(Op.getSimpleValueType() == MVT::v2i64 && "Bad shuffle type!");
8170 assert(V1.getSimpleValueType() == MVT::v2i64 && "Bad operand type!");
8171 assert(V2.getSimpleValueType() == MVT::v2i64 && "Bad operand type!");
8172 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8173 ArrayRef<int> Mask = SVOp->getMask();
8174 assert(Mask.size() == 2 && "Unexpected mask size for v2 shuffle!");
8176 if (isSingleInputShuffleMask(Mask)) {
8177 // Check for being able to broadcast a single element.
8178 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v2i64, V1,
8179 Mask, Subtarget, DAG))
8182 // Straight shuffle of a single input vector. For everything from SSE2
8183 // onward this has a single fast instruction with no scary immediates.
8184 // We have to map the mask as it is actually a v4i32 shuffle instruction.
8185 V1 = DAG.getBitcast(MVT::v4i32, V1);
8186 int WidenedMask[4] = {
8187 std::max(Mask[0], 0) * 2, std::max(Mask[0], 0) * 2 + 1,
8188 std::max(Mask[1], 0) * 2, std::max(Mask[1], 0) * 2 + 1};
8189 return DAG.getBitcast(
8191 DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32, V1,
8192 getV4X86ShuffleImm8ForMask(WidenedMask, DL, DAG)));
8194 assert(Mask[0] != -1 && "No undef lanes in multi-input v2 shuffles!");
8195 assert(Mask[1] != -1 && "No undef lanes in multi-input v2 shuffles!");
8196 assert(Mask[0] < 2 && "We sort V1 to be the first input.");
8197 assert(Mask[1] >= 2 && "We sort V2 to be the second input.");
8199 // If we have a blend of two PACKUS operations an the blend aligns with the
8200 // low and half halves, we can just merge the PACKUS operations. This is
8201 // particularly important as it lets us merge shuffles that this routine itself
8203 auto GetPackNode = [](SDValue V) {
8204 while (V.getOpcode() == ISD::BITCAST)
8205 V = V.getOperand(0);
8207 return V.getOpcode() == X86ISD::PACKUS ? V : SDValue();
8209 if (SDValue V1Pack = GetPackNode(V1))
8210 if (SDValue V2Pack = GetPackNode(V2))
8211 return DAG.getBitcast(MVT::v2i64,
8212 DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8,
8213 Mask[0] == 0 ? V1Pack.getOperand(0)
8214 : V1Pack.getOperand(1),
8215 Mask[1] == 2 ? V2Pack.getOperand(0)
8216 : V2Pack.getOperand(1)));
8218 // Try to use shift instructions.
8220 lowerVectorShuffleAsShift(DL, MVT::v2i64, V1, V2, Mask, DAG))
8223 // When loading a scalar and then shuffling it into a vector we can often do
8224 // the insertion cheaply.
8225 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8226 DL, MVT::v2i64, V1, V2, Mask, Subtarget, DAG))
8228 // Try inverting the insertion since for v2 masks it is easy to do and we
8229 // can't reliably sort the mask one way or the other.
8230 int InverseMask[2] = {Mask[0] ^ 2, Mask[1] ^ 2};
8231 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8232 DL, MVT::v2i64, V2, V1, InverseMask, Subtarget, DAG))
8235 // We have different paths for blend lowering, but they all must use the
8236 // *exact* same predicate.
8237 bool IsBlendSupported = Subtarget->hasSSE41();
8238 if (IsBlendSupported)
8239 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v2i64, V1, V2, Mask,
8243 // Use dedicated unpack instructions for masks that match their pattern.
8244 if (isShuffleEquivalent(V1, V2, Mask, {0, 2}))
8245 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v2i64, V1, V2);
8246 if (isShuffleEquivalent(V1, V2, Mask, {1, 3}))
8247 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v2i64, V1, V2);
8249 // Try to use byte rotation instructions.
8250 // Its more profitable for pre-SSSE3 to use shuffles/unpacks.
8251 if (Subtarget->hasSSSE3())
8252 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
8253 DL, MVT::v2i64, V1, V2, Mask, Subtarget, DAG))
8256 // If we have direct support for blends, we should lower by decomposing into
8257 // a permute. That will be faster than the domain cross.
8258 if (IsBlendSupported)
8259 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v2i64, V1, V2,
8262 // We implement this with SHUFPD which is pretty lame because it will likely
8263 // incur 2 cycles of stall for integer vectors on Nehalem and older chips.
8264 // However, all the alternatives are still more cycles and newer chips don't
8265 // have this problem. It would be really nice if x86 had better shuffles here.
8266 V1 = DAG.getBitcast(MVT::v2f64, V1);
8267 V2 = DAG.getBitcast(MVT::v2f64, V2);
8268 return DAG.getBitcast(MVT::v2i64,
8269 DAG.getVectorShuffle(MVT::v2f64, DL, V1, V2, Mask));
8272 /// \brief Test whether this can be lowered with a single SHUFPS instruction.
8274 /// This is used to disable more specialized lowerings when the shufps lowering
8275 /// will happen to be efficient.
8276 static bool isSingleSHUFPSMask(ArrayRef<int> Mask) {
8277 // This routine only handles 128-bit shufps.
8278 assert(Mask.size() == 4 && "Unsupported mask size!");
8280 // To lower with a single SHUFPS we need to have the low half and high half
8281 // each requiring a single input.
8282 if (Mask[0] != -1 && Mask[1] != -1 && (Mask[0] < 4) != (Mask[1] < 4))
8284 if (Mask[2] != -1 && Mask[3] != -1 && (Mask[2] < 4) != (Mask[3] < 4))
8290 /// \brief Lower a vector shuffle using the SHUFPS instruction.
8292 /// This is a helper routine dedicated to lowering vector shuffles using SHUFPS.
8293 /// It makes no assumptions about whether this is the *best* lowering, it simply
8295 static SDValue lowerVectorShuffleWithSHUFPS(SDLoc DL, MVT VT,
8296 ArrayRef<int> Mask, SDValue V1,
8297 SDValue V2, SelectionDAG &DAG) {
8298 SDValue LowV = V1, HighV = V2;
8299 int NewMask[4] = {Mask[0], Mask[1], Mask[2], Mask[3]};
8302 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8304 if (NumV2Elements == 1) {
8306 std::find_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; }) -
8309 // Compute the index adjacent to V2Index and in the same half by toggling
8311 int V2AdjIndex = V2Index ^ 1;
8313 if (Mask[V2AdjIndex] == -1) {
8314 // Handles all the cases where we have a single V2 element and an undef.
8315 // This will only ever happen in the high lanes because we commute the
8316 // vector otherwise.
8318 std::swap(LowV, HighV);
8319 NewMask[V2Index] -= 4;
8321 // Handle the case where the V2 element ends up adjacent to a V1 element.
8322 // To make this work, blend them together as the first step.
8323 int V1Index = V2AdjIndex;
8324 int BlendMask[4] = {Mask[V2Index] - 4, 0, Mask[V1Index], 0};
8325 V2 = DAG.getNode(X86ISD::SHUFP, DL, VT, V2, V1,
8326 getV4X86ShuffleImm8ForMask(BlendMask, DL, DAG));
8328 // Now proceed to reconstruct the final blend as we have the necessary
8329 // high or low half formed.
8336 NewMask[V1Index] = 2; // We put the V1 element in V2[2].
8337 NewMask[V2Index] = 0; // We shifted the V2 element into V2[0].
8339 } else if (NumV2Elements == 2) {
8340 if (Mask[0] < 4 && Mask[1] < 4) {
8341 // Handle the easy case where we have V1 in the low lanes and V2 in the
8345 } else if (Mask[2] < 4 && Mask[3] < 4) {
8346 // We also handle the reversed case because this utility may get called
8347 // when we detect a SHUFPS pattern but can't easily commute the shuffle to
8348 // arrange things in the right direction.
8354 // We have a mixture of V1 and V2 in both low and high lanes. Rather than
8355 // trying to place elements directly, just blend them and set up the final
8356 // shuffle to place them.
8358 // The first two blend mask elements are for V1, the second two are for
8360 int BlendMask[4] = {Mask[0] < 4 ? Mask[0] : Mask[1],
8361 Mask[2] < 4 ? Mask[2] : Mask[3],
8362 (Mask[0] >= 4 ? Mask[0] : Mask[1]) - 4,
8363 (Mask[2] >= 4 ? Mask[2] : Mask[3]) - 4};
8364 V1 = DAG.getNode(X86ISD::SHUFP, DL, VT, V1, V2,
8365 getV4X86ShuffleImm8ForMask(BlendMask, DL, DAG));
8367 // Now we do a normal shuffle of V1 by giving V1 as both operands to
8370 NewMask[0] = Mask[0] < 4 ? 0 : 2;
8371 NewMask[1] = Mask[0] < 4 ? 2 : 0;
8372 NewMask[2] = Mask[2] < 4 ? 1 : 3;
8373 NewMask[3] = Mask[2] < 4 ? 3 : 1;
8376 return DAG.getNode(X86ISD::SHUFP, DL, VT, LowV, HighV,
8377 getV4X86ShuffleImm8ForMask(NewMask, DL, DAG));
8380 /// \brief Lower 4-lane 32-bit floating point shuffles.
8382 /// Uses instructions exclusively from the floating point unit to minimize
8383 /// domain crossing penalties, as these are sufficient to implement all v4f32
8385 static SDValue lowerV4F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8386 const X86Subtarget *Subtarget,
8387 SelectionDAG &DAG) {
8389 assert(Op.getSimpleValueType() == MVT::v4f32 && "Bad shuffle type!");
8390 assert(V1.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8391 assert(V2.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8392 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8393 ArrayRef<int> Mask = SVOp->getMask();
8394 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
8397 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8399 if (NumV2Elements == 0) {
8400 // Check for being able to broadcast a single element.
8401 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4f32, V1,
8402 Mask, Subtarget, DAG))
8405 // Use even/odd duplicate instructions for masks that match their pattern.
8406 if (Subtarget->hasSSE3()) {
8407 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2}))
8408 return DAG.getNode(X86ISD::MOVSLDUP, DL, MVT::v4f32, V1);
8409 if (isShuffleEquivalent(V1, V2, Mask, {1, 1, 3, 3}))
8410 return DAG.getNode(X86ISD::MOVSHDUP, DL, MVT::v4f32, V1);
8413 if (Subtarget->hasAVX()) {
8414 // If we have AVX, we can use VPERMILPS which will allow folding a load
8415 // into the shuffle.
8416 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v4f32, V1,
8417 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8420 // Otherwise, use a straight shuffle of a single input vector. We pass the
8421 // input vector to both operands to simulate this with a SHUFPS.
8422 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v4f32, V1, V1,
8423 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8426 // There are special ways we can lower some single-element blends. However, we
8427 // have custom ways we can lower more complex single-element blends below that
8428 // we defer to if both this and BLENDPS fail to match, so restrict this to
8429 // when the V2 input is targeting element 0 of the mask -- that is the fast
8431 if (NumV2Elements == 1 && Mask[0] >= 4)
8432 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v4f32, V1, V2,
8433 Mask, Subtarget, DAG))
8436 if (Subtarget->hasSSE41()) {
8437 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4f32, V1, V2, Mask,
8441 // Use INSERTPS if we can complete the shuffle efficiently.
8442 if (SDValue V = lowerVectorShuffleAsInsertPS(Op, V1, V2, Mask, DAG))
8445 if (!isSingleSHUFPSMask(Mask))
8446 if (SDValue BlendPerm = lowerVectorShuffleAsBlendAndPermute(
8447 DL, MVT::v4f32, V1, V2, Mask, DAG))
8451 // Use dedicated unpack instructions for masks that match their pattern.
8452 if (isShuffleEquivalent(V1, V2, Mask, {0, 4, 1, 5}))
8453 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4f32, V1, V2);
8454 if (isShuffleEquivalent(V1, V2, Mask, {2, 6, 3, 7}))
8455 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4f32, V1, V2);
8456 if (isShuffleEquivalent(V1, V2, Mask, {4, 0, 5, 1}))
8457 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4f32, V2, V1);
8458 if (isShuffleEquivalent(V1, V2, Mask, {6, 2, 7, 3}))
8459 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4f32, V2, V1);
8461 // Otherwise fall back to a SHUFPS lowering strategy.
8462 return lowerVectorShuffleWithSHUFPS(DL, MVT::v4f32, Mask, V1, V2, DAG);
8465 /// \brief Lower 4-lane i32 vector shuffles.
8467 /// We try to handle these with integer-domain shuffles where we can, but for
8468 /// blends we use the floating point domain blend instructions.
8469 static SDValue lowerV4I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8470 const X86Subtarget *Subtarget,
8471 SelectionDAG &DAG) {
8473 assert(Op.getSimpleValueType() == MVT::v4i32 && "Bad shuffle type!");
8474 assert(V1.getSimpleValueType() == MVT::v4i32 && "Bad operand type!");
8475 assert(V2.getSimpleValueType() == MVT::v4i32 && "Bad operand type!");
8476 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8477 ArrayRef<int> Mask = SVOp->getMask();
8478 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
8480 // Whenever we can lower this as a zext, that instruction is strictly faster
8481 // than any alternative. It also allows us to fold memory operands into the
8482 // shuffle in many cases.
8483 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v4i32, V1, V2,
8484 Mask, Subtarget, DAG))
8488 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8490 if (NumV2Elements == 0) {
8491 // Check for being able to broadcast a single element.
8492 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4i32, V1,
8493 Mask, Subtarget, DAG))
8496 // Straight shuffle of a single input vector. For everything from SSE2
8497 // onward this has a single fast instruction with no scary immediates.
8498 // We coerce the shuffle pattern to be compatible with UNPCK instructions
8499 // but we aren't actually going to use the UNPCK instruction because doing
8500 // so prevents folding a load into this instruction or making a copy.
8501 const int UnpackLoMask[] = {0, 0, 1, 1};
8502 const int UnpackHiMask[] = {2, 2, 3, 3};
8503 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 1, 1}))
8504 Mask = UnpackLoMask;
8505 else if (isShuffleEquivalent(V1, V2, Mask, {2, 2, 3, 3}))
8506 Mask = UnpackHiMask;
8508 return DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32, V1,
8509 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8512 // Try to use shift instructions.
8514 lowerVectorShuffleAsShift(DL, MVT::v4i32, V1, V2, Mask, DAG))
8517 // There are special ways we can lower some single-element blends.
8518 if (NumV2Elements == 1)
8519 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v4i32, V1, V2,
8520 Mask, Subtarget, DAG))
8523 // We have different paths for blend lowering, but they all must use the
8524 // *exact* same predicate.
8525 bool IsBlendSupported = Subtarget->hasSSE41();
8526 if (IsBlendSupported)
8527 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4i32, V1, V2, Mask,
8531 if (SDValue Masked =
8532 lowerVectorShuffleAsBitMask(DL, MVT::v4i32, V1, V2, Mask, DAG))
8535 // Use dedicated unpack instructions for masks that match their pattern.
8536 if (isShuffleEquivalent(V1, V2, Mask, {0, 4, 1, 5}))
8537 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4i32, V1, V2);
8538 if (isShuffleEquivalent(V1, V2, Mask, {2, 6, 3, 7}))
8539 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4i32, V1, V2);
8540 if (isShuffleEquivalent(V1, V2, Mask, {4, 0, 5, 1}))
8541 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4i32, V2, V1);
8542 if (isShuffleEquivalent(V1, V2, Mask, {6, 2, 7, 3}))
8543 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4i32, V2, V1);
8545 // Try to use byte rotation instructions.
8546 // Its more profitable for pre-SSSE3 to use shuffles/unpacks.
8547 if (Subtarget->hasSSSE3())
8548 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
8549 DL, MVT::v4i32, V1, V2, Mask, Subtarget, DAG))
8552 // If we have direct support for blends, we should lower by decomposing into
8553 // a permute. That will be faster than the domain cross.
8554 if (IsBlendSupported)
8555 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4i32, V1, V2,
8558 // Try to lower by permuting the inputs into an unpack instruction.
8559 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(DL, MVT::v4i32, V1,
8563 // We implement this with SHUFPS because it can blend from two vectors.
8564 // Because we're going to eventually use SHUFPS, we use SHUFPS even to build
8565 // up the inputs, bypassing domain shift penalties that we would encur if we
8566 // directly used PSHUFD on Nehalem and older. For newer chips, this isn't
8568 return DAG.getBitcast(
8570 DAG.getVectorShuffle(MVT::v4f32, DL, DAG.getBitcast(MVT::v4f32, V1),
8571 DAG.getBitcast(MVT::v4f32, V2), Mask));
8574 /// \brief Lowering of single-input v8i16 shuffles is the cornerstone of SSE2
8575 /// shuffle lowering, and the most complex part.
8577 /// The lowering strategy is to try to form pairs of input lanes which are
8578 /// targeted at the same half of the final vector, and then use a dword shuffle
8579 /// to place them onto the right half, and finally unpack the paired lanes into
8580 /// their final position.
8582 /// The exact breakdown of how to form these dword pairs and align them on the
8583 /// correct sides is really tricky. See the comments within the function for
8584 /// more of the details.
8586 /// This code also handles repeated 128-bit lanes of v8i16 shuffles, but each
8587 /// lane must shuffle the *exact* same way. In fact, you must pass a v8 Mask to
8588 /// this routine for it to work correctly. To shuffle a 256-bit or 512-bit i16
8589 /// vector, form the analogous 128-bit 8-element Mask.
8590 static SDValue lowerV8I16GeneralSingleInputVectorShuffle(
8591 SDLoc DL, MVT VT, SDValue V, MutableArrayRef<int> Mask,
8592 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
8593 assert(VT.getScalarType() == MVT::i16 && "Bad input type!");
8594 MVT PSHUFDVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() / 2);
8596 assert(Mask.size() == 8 && "Shuffle mask length doen't match!");
8597 MutableArrayRef<int> LoMask = Mask.slice(0, 4);
8598 MutableArrayRef<int> HiMask = Mask.slice(4, 4);
8600 SmallVector<int, 4> LoInputs;
8601 std::copy_if(LoMask.begin(), LoMask.end(), std::back_inserter(LoInputs),
8602 [](int M) { return M >= 0; });
8603 std::sort(LoInputs.begin(), LoInputs.end());
8604 LoInputs.erase(std::unique(LoInputs.begin(), LoInputs.end()), LoInputs.end());
8605 SmallVector<int, 4> HiInputs;
8606 std::copy_if(HiMask.begin(), HiMask.end(), std::back_inserter(HiInputs),
8607 [](int M) { return M >= 0; });
8608 std::sort(HiInputs.begin(), HiInputs.end());
8609 HiInputs.erase(std::unique(HiInputs.begin(), HiInputs.end()), HiInputs.end());
8611 std::lower_bound(LoInputs.begin(), LoInputs.end(), 4) - LoInputs.begin();
8612 int NumHToL = LoInputs.size() - NumLToL;
8614 std::lower_bound(HiInputs.begin(), HiInputs.end(), 4) - HiInputs.begin();
8615 int NumHToH = HiInputs.size() - NumLToH;
8616 MutableArrayRef<int> LToLInputs(LoInputs.data(), NumLToL);
8617 MutableArrayRef<int> LToHInputs(HiInputs.data(), NumLToH);
8618 MutableArrayRef<int> HToLInputs(LoInputs.data() + NumLToL, NumHToL);
8619 MutableArrayRef<int> HToHInputs(HiInputs.data() + NumLToH, NumHToH);
8621 // Simplify the 1-into-3 and 3-into-1 cases with a single pshufd. For all
8622 // such inputs we can swap two of the dwords across the half mark and end up
8623 // with <=2 inputs to each half in each half. Once there, we can fall through
8624 // to the generic code below. For example:
8626 // Input: [a, b, c, d, e, f, g, h] -PSHUFD[0,2,1,3]-> [a, b, e, f, c, d, g, h]
8627 // Mask: [0, 1, 2, 7, 4, 5, 6, 3] -----------------> [0, 1, 4, 7, 2, 3, 6, 5]
8629 // However in some very rare cases we have a 1-into-3 or 3-into-1 on one half
8630 // and an existing 2-into-2 on the other half. In this case we may have to
8631 // pre-shuffle the 2-into-2 half to avoid turning it into a 3-into-1 or
8632 // 1-into-3 which could cause us to cycle endlessly fixing each side in turn.
8633 // Fortunately, we don't have to handle anything but a 2-into-2 pattern
8634 // because any other situation (including a 3-into-1 or 1-into-3 in the other
8635 // half than the one we target for fixing) will be fixed when we re-enter this
8636 // path. We will also combine away any sequence of PSHUFD instructions that
8637 // result into a single instruction. Here is an example of the tricky case:
8639 // Input: [a, b, c, d, e, f, g, h] -PSHUFD[0,2,1,3]-> [a, b, e, f, c, d, g, h]
8640 // Mask: [3, 7, 1, 0, 2, 7, 3, 5] -THIS-IS-BAD!!!!-> [5, 7, 1, 0, 4, 7, 5, 3]
8642 // This now has a 1-into-3 in the high half! Instead, we do two shuffles:
8644 // Input: [a, b, c, d, e, f, g, h] PSHUFHW[0,2,1,3]-> [a, b, c, d, e, g, f, h]
8645 // Mask: [3, 7, 1, 0, 2, 7, 3, 5] -----------------> [3, 7, 1, 0, 2, 7, 3, 6]
8647 // Input: [a, b, c, d, e, g, f, h] -PSHUFD[0,2,1,3]-> [a, b, e, g, c, d, f, h]
8648 // Mask: [3, 7, 1, 0, 2, 7, 3, 6] -----------------> [5, 7, 1, 0, 4, 7, 5, 6]
8650 // The result is fine to be handled by the generic logic.
8651 auto balanceSides = [&](ArrayRef<int> AToAInputs, ArrayRef<int> BToAInputs,
8652 ArrayRef<int> BToBInputs, ArrayRef<int> AToBInputs,
8653 int AOffset, int BOffset) {
8654 assert((AToAInputs.size() == 3 || AToAInputs.size() == 1) &&
8655 "Must call this with A having 3 or 1 inputs from the A half.");
8656 assert((BToAInputs.size() == 1 || BToAInputs.size() == 3) &&
8657 "Must call this with B having 1 or 3 inputs from the B half.");
8658 assert(AToAInputs.size() + BToAInputs.size() == 4 &&
8659 "Must call this with either 3:1 or 1:3 inputs (summing to 4).");
8661 bool ThreeAInputs = AToAInputs.size() == 3;
8663 // Compute the index of dword with only one word among the three inputs in
8664 // a half by taking the sum of the half with three inputs and subtracting
8665 // the sum of the actual three inputs. The difference is the remaining
8668 int &TripleDWord = ThreeAInputs ? ADWord : BDWord;
8669 int &OneInputDWord = ThreeAInputs ? BDWord : ADWord;
8670 int TripleInputOffset = ThreeAInputs ? AOffset : BOffset;
8671 ArrayRef<int> TripleInputs = ThreeAInputs ? AToAInputs : BToAInputs;
8672 int OneInput = ThreeAInputs ? BToAInputs[0] : AToAInputs[0];
8673 int TripleInputSum = 0 + 1 + 2 + 3 + (4 * TripleInputOffset);
8674 int TripleNonInputIdx =
8675 TripleInputSum - std::accumulate(TripleInputs.begin(), TripleInputs.end(), 0);
8676 TripleDWord = TripleNonInputIdx / 2;
8678 // We use xor with one to compute the adjacent DWord to whichever one the
8680 OneInputDWord = (OneInput / 2) ^ 1;
8682 // Check for one tricky case: We're fixing a 3<-1 or a 1<-3 shuffle for AToA
8683 // and BToA inputs. If there is also such a problem with the BToB and AToB
8684 // inputs, we don't try to fix it necessarily -- we'll recurse and see it in
8685 // the next pass. However, if we have a 2<-2 in the BToB and AToB inputs, it
8686 // is essential that we don't *create* a 3<-1 as then we might oscillate.
8687 if (BToBInputs.size() == 2 && AToBInputs.size() == 2) {
8688 // Compute how many inputs will be flipped by swapping these DWords. We
8690 // to balance this to ensure we don't form a 3-1 shuffle in the other
8692 int NumFlippedAToBInputs =
8693 std::count(AToBInputs.begin(), AToBInputs.end(), 2 * ADWord) +
8694 std::count(AToBInputs.begin(), AToBInputs.end(), 2 * ADWord + 1);
8695 int NumFlippedBToBInputs =
8696 std::count(BToBInputs.begin(), BToBInputs.end(), 2 * BDWord) +
8697 std::count(BToBInputs.begin(), BToBInputs.end(), 2 * BDWord + 1);
8698 if ((NumFlippedAToBInputs == 1 &&
8699 (NumFlippedBToBInputs == 0 || NumFlippedBToBInputs == 2)) ||
8700 (NumFlippedBToBInputs == 1 &&
8701 (NumFlippedAToBInputs == 0 || NumFlippedAToBInputs == 2))) {
8702 // We choose whether to fix the A half or B half based on whether that
8703 // half has zero flipped inputs. At zero, we may not be able to fix it
8704 // with that half. We also bias towards fixing the B half because that
8705 // will more commonly be the high half, and we have to bias one way.
8706 auto FixFlippedInputs = [&V, &DL, &Mask, &DAG](int PinnedIdx, int DWord,
8707 ArrayRef<int> Inputs) {
8708 int FixIdx = PinnedIdx ^ 1; // The adjacent slot to the pinned slot.
8709 bool IsFixIdxInput = std::find(Inputs.begin(), Inputs.end(),
8710 PinnedIdx ^ 1) != Inputs.end();
8711 // Determine whether the free index is in the flipped dword or the
8712 // unflipped dword based on where the pinned index is. We use this bit
8713 // in an xor to conditionally select the adjacent dword.
8714 int FixFreeIdx = 2 * (DWord ^ (PinnedIdx / 2 == DWord));
8715 bool IsFixFreeIdxInput = std::find(Inputs.begin(), Inputs.end(),
8716 FixFreeIdx) != Inputs.end();
8717 if (IsFixIdxInput == IsFixFreeIdxInput)
8719 IsFixFreeIdxInput = std::find(Inputs.begin(), Inputs.end(),
8720 FixFreeIdx) != Inputs.end();
8721 assert(IsFixIdxInput != IsFixFreeIdxInput &&
8722 "We need to be changing the number of flipped inputs!");
8723 int PSHUFHalfMask[] = {0, 1, 2, 3};
8724 std::swap(PSHUFHalfMask[FixFreeIdx % 4], PSHUFHalfMask[FixIdx % 4]);
8725 V = DAG.getNode(FixIdx < 4 ? X86ISD::PSHUFLW : X86ISD::PSHUFHW, DL,
8727 getV4X86ShuffleImm8ForMask(PSHUFHalfMask, DL, DAG));
8730 if (M != -1 && M == FixIdx)
8732 else if (M != -1 && M == FixFreeIdx)
8735 if (NumFlippedBToBInputs != 0) {
8737 BToAInputs.size() == 3 ? TripleNonInputIdx : OneInput;
8738 FixFlippedInputs(BPinnedIdx, BDWord, BToBInputs);
8740 assert(NumFlippedAToBInputs != 0 && "Impossible given predicates!");
8741 int APinnedIdx = ThreeAInputs ? TripleNonInputIdx : OneInput;
8742 FixFlippedInputs(APinnedIdx, ADWord, AToBInputs);
8747 int PSHUFDMask[] = {0, 1, 2, 3};
8748 PSHUFDMask[ADWord] = BDWord;
8749 PSHUFDMask[BDWord] = ADWord;
8752 DAG.getNode(X86ISD::PSHUFD, DL, PSHUFDVT, DAG.getBitcast(PSHUFDVT, V),
8753 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
8755 // Adjust the mask to match the new locations of A and B.
8757 if (M != -1 && M/2 == ADWord)
8758 M = 2 * BDWord + M % 2;
8759 else if (M != -1 && M/2 == BDWord)
8760 M = 2 * ADWord + M % 2;
8762 // Recurse back into this routine to re-compute state now that this isn't
8763 // a 3 and 1 problem.
8764 return lowerV8I16GeneralSingleInputVectorShuffle(DL, VT, V, Mask, Subtarget,
8767 if ((NumLToL == 3 && NumHToL == 1) || (NumLToL == 1 && NumHToL == 3))
8768 return balanceSides(LToLInputs, HToLInputs, HToHInputs, LToHInputs, 0, 4);
8769 else if ((NumHToH == 3 && NumLToH == 1) || (NumHToH == 1 && NumLToH == 3))
8770 return balanceSides(HToHInputs, LToHInputs, LToLInputs, HToLInputs, 4, 0);
8772 // At this point there are at most two inputs to the low and high halves from
8773 // each half. That means the inputs can always be grouped into dwords and
8774 // those dwords can then be moved to the correct half with a dword shuffle.
8775 // We use at most one low and one high word shuffle to collect these paired
8776 // inputs into dwords, and finally a dword shuffle to place them.
8777 int PSHUFLMask[4] = {-1, -1, -1, -1};
8778 int PSHUFHMask[4] = {-1, -1, -1, -1};
8779 int PSHUFDMask[4] = {-1, -1, -1, -1};
8781 // First fix the masks for all the inputs that are staying in their
8782 // original halves. This will then dictate the targets of the cross-half
8784 auto fixInPlaceInputs =
8785 [&PSHUFDMask](ArrayRef<int> InPlaceInputs, ArrayRef<int> IncomingInputs,
8786 MutableArrayRef<int> SourceHalfMask,
8787 MutableArrayRef<int> HalfMask, int HalfOffset) {
8788 if (InPlaceInputs.empty())
8790 if (InPlaceInputs.size() == 1) {
8791 SourceHalfMask[InPlaceInputs[0] - HalfOffset] =
8792 InPlaceInputs[0] - HalfOffset;
8793 PSHUFDMask[InPlaceInputs[0] / 2] = InPlaceInputs[0] / 2;
8796 if (IncomingInputs.empty()) {
8797 // Just fix all of the in place inputs.
8798 for (int Input : InPlaceInputs) {
8799 SourceHalfMask[Input - HalfOffset] = Input - HalfOffset;
8800 PSHUFDMask[Input / 2] = Input / 2;
8805 assert(InPlaceInputs.size() == 2 && "Cannot handle 3 or 4 inputs!");
8806 SourceHalfMask[InPlaceInputs[0] - HalfOffset] =
8807 InPlaceInputs[0] - HalfOffset;
8808 // Put the second input next to the first so that they are packed into
8809 // a dword. We find the adjacent index by toggling the low bit.
8810 int AdjIndex = InPlaceInputs[0] ^ 1;
8811 SourceHalfMask[AdjIndex - HalfOffset] = InPlaceInputs[1] - HalfOffset;
8812 std::replace(HalfMask.begin(), HalfMask.end(), InPlaceInputs[1], AdjIndex);
8813 PSHUFDMask[AdjIndex / 2] = AdjIndex / 2;
8815 fixInPlaceInputs(LToLInputs, HToLInputs, PSHUFLMask, LoMask, 0);
8816 fixInPlaceInputs(HToHInputs, LToHInputs, PSHUFHMask, HiMask, 4);
8818 // Now gather the cross-half inputs and place them into a free dword of
8819 // their target half.
8820 // FIXME: This operation could almost certainly be simplified dramatically to
8821 // look more like the 3-1 fixing operation.
8822 auto moveInputsToRightHalf = [&PSHUFDMask](
8823 MutableArrayRef<int> IncomingInputs, ArrayRef<int> ExistingInputs,
8824 MutableArrayRef<int> SourceHalfMask, MutableArrayRef<int> HalfMask,
8825 MutableArrayRef<int> FinalSourceHalfMask, int SourceOffset,
8827 auto isWordClobbered = [](ArrayRef<int> SourceHalfMask, int Word) {
8828 return SourceHalfMask[Word] != -1 && SourceHalfMask[Word] != Word;
8830 auto isDWordClobbered = [&isWordClobbered](ArrayRef<int> SourceHalfMask,
8832 int LowWord = Word & ~1;
8833 int HighWord = Word | 1;
8834 return isWordClobbered(SourceHalfMask, LowWord) ||
8835 isWordClobbered(SourceHalfMask, HighWord);
8838 if (IncomingInputs.empty())
8841 if (ExistingInputs.empty()) {
8842 // Map any dwords with inputs from them into the right half.
8843 for (int Input : IncomingInputs) {
8844 // If the source half mask maps over the inputs, turn those into
8845 // swaps and use the swapped lane.
8846 if (isWordClobbered(SourceHalfMask, Input - SourceOffset)) {
8847 if (SourceHalfMask[SourceHalfMask[Input - SourceOffset]] == -1) {
8848 SourceHalfMask[SourceHalfMask[Input - SourceOffset]] =
8849 Input - SourceOffset;
8850 // We have to swap the uses in our half mask in one sweep.
8851 for (int &M : HalfMask)
8852 if (M == SourceHalfMask[Input - SourceOffset] + SourceOffset)
8854 else if (M == Input)
8855 M = SourceHalfMask[Input - SourceOffset] + SourceOffset;
8857 assert(SourceHalfMask[SourceHalfMask[Input - SourceOffset]] ==
8858 Input - SourceOffset &&
8859 "Previous placement doesn't match!");
8861 // Note that this correctly re-maps both when we do a swap and when
8862 // we observe the other side of the swap above. We rely on that to
8863 // avoid swapping the members of the input list directly.
8864 Input = SourceHalfMask[Input - SourceOffset] + SourceOffset;
8867 // Map the input's dword into the correct half.
8868 if (PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] == -1)
8869 PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] = Input / 2;
8871 assert(PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] ==
8873 "Previous placement doesn't match!");
8876 // And just directly shift any other-half mask elements to be same-half
8877 // as we will have mirrored the dword containing the element into the
8878 // same position within that half.
8879 for (int &M : HalfMask)
8880 if (M >= SourceOffset && M < SourceOffset + 4) {
8881 M = M - SourceOffset + DestOffset;
8882 assert(M >= 0 && "This should never wrap below zero!");
8887 // Ensure we have the input in a viable dword of its current half. This
8888 // is particularly tricky because the original position may be clobbered
8889 // by inputs being moved and *staying* in that half.
8890 if (IncomingInputs.size() == 1) {
8891 if (isWordClobbered(SourceHalfMask, IncomingInputs[0] - SourceOffset)) {
8892 int InputFixed = std::find(std::begin(SourceHalfMask),
8893 std::end(SourceHalfMask), -1) -
8894 std::begin(SourceHalfMask) + SourceOffset;
8895 SourceHalfMask[InputFixed - SourceOffset] =
8896 IncomingInputs[0] - SourceOffset;
8897 std::replace(HalfMask.begin(), HalfMask.end(), IncomingInputs[0],
8899 IncomingInputs[0] = InputFixed;
8901 } else if (IncomingInputs.size() == 2) {
8902 if (IncomingInputs[0] / 2 != IncomingInputs[1] / 2 ||
8903 isDWordClobbered(SourceHalfMask, IncomingInputs[0] - SourceOffset)) {
8904 // We have two non-adjacent or clobbered inputs we need to extract from
8905 // the source half. To do this, we need to map them into some adjacent
8906 // dword slot in the source mask.
8907 int InputsFixed[2] = {IncomingInputs[0] - SourceOffset,
8908 IncomingInputs[1] - SourceOffset};
8910 // If there is a free slot in the source half mask adjacent to one of
8911 // the inputs, place the other input in it. We use (Index XOR 1) to
8912 // compute an adjacent index.
8913 if (!isWordClobbered(SourceHalfMask, InputsFixed[0]) &&
8914 SourceHalfMask[InputsFixed[0] ^ 1] == -1) {
8915 SourceHalfMask[InputsFixed[0]] = InputsFixed[0];
8916 SourceHalfMask[InputsFixed[0] ^ 1] = InputsFixed[1];
8917 InputsFixed[1] = InputsFixed[0] ^ 1;
8918 } else if (!isWordClobbered(SourceHalfMask, InputsFixed[1]) &&
8919 SourceHalfMask[InputsFixed[1] ^ 1] == -1) {
8920 SourceHalfMask[InputsFixed[1]] = InputsFixed[1];
8921 SourceHalfMask[InputsFixed[1] ^ 1] = InputsFixed[0];
8922 InputsFixed[0] = InputsFixed[1] ^ 1;
8923 } else if (SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1)] == -1 &&
8924 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1) + 1] == -1) {
8925 // The two inputs are in the same DWord but it is clobbered and the
8926 // adjacent DWord isn't used at all. Move both inputs to the free
8928 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1)] = InputsFixed[0];
8929 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1) + 1] = InputsFixed[1];
8930 InputsFixed[0] = 2 * ((InputsFixed[0] / 2) ^ 1);
8931 InputsFixed[1] = 2 * ((InputsFixed[0] / 2) ^ 1) + 1;
8933 // The only way we hit this point is if there is no clobbering
8934 // (because there are no off-half inputs to this half) and there is no
8935 // free slot adjacent to one of the inputs. In this case, we have to
8936 // swap an input with a non-input.
8937 for (int i = 0; i < 4; ++i)
8938 assert((SourceHalfMask[i] == -1 || SourceHalfMask[i] == i) &&
8939 "We can't handle any clobbers here!");
8940 assert(InputsFixed[1] != (InputsFixed[0] ^ 1) &&
8941 "Cannot have adjacent inputs here!");
8943 SourceHalfMask[InputsFixed[0] ^ 1] = InputsFixed[1];
8944 SourceHalfMask[InputsFixed[1]] = InputsFixed[0] ^ 1;
8946 // We also have to update the final source mask in this case because
8947 // it may need to undo the above swap.
8948 for (int &M : FinalSourceHalfMask)
8949 if (M == (InputsFixed[0] ^ 1) + SourceOffset)
8950 M = InputsFixed[1] + SourceOffset;
8951 else if (M == InputsFixed[1] + SourceOffset)
8952 M = (InputsFixed[0] ^ 1) + SourceOffset;
8954 InputsFixed[1] = InputsFixed[0] ^ 1;
8957 // Point everything at the fixed inputs.
8958 for (int &M : HalfMask)
8959 if (M == IncomingInputs[0])
8960 M = InputsFixed[0] + SourceOffset;
8961 else if (M == IncomingInputs[1])
8962 M = InputsFixed[1] + SourceOffset;
8964 IncomingInputs[0] = InputsFixed[0] + SourceOffset;
8965 IncomingInputs[1] = InputsFixed[1] + SourceOffset;
8968 llvm_unreachable("Unhandled input size!");
8971 // Now hoist the DWord down to the right half.
8972 int FreeDWord = (PSHUFDMask[DestOffset / 2] == -1 ? 0 : 1) + DestOffset / 2;
8973 assert(PSHUFDMask[FreeDWord] == -1 && "DWord not free");
8974 PSHUFDMask[FreeDWord] = IncomingInputs[0] / 2;
8975 for (int &M : HalfMask)
8976 for (int Input : IncomingInputs)
8978 M = FreeDWord * 2 + Input % 2;
8980 moveInputsToRightHalf(HToLInputs, LToLInputs, PSHUFHMask, LoMask, HiMask,
8981 /*SourceOffset*/ 4, /*DestOffset*/ 0);
8982 moveInputsToRightHalf(LToHInputs, HToHInputs, PSHUFLMask, HiMask, LoMask,
8983 /*SourceOffset*/ 0, /*DestOffset*/ 4);
8985 // Now enact all the shuffles we've computed to move the inputs into their
8987 if (!isNoopShuffleMask(PSHUFLMask))
8988 V = DAG.getNode(X86ISD::PSHUFLW, DL, VT, V,
8989 getV4X86ShuffleImm8ForMask(PSHUFLMask, DL, DAG));
8990 if (!isNoopShuffleMask(PSHUFHMask))
8991 V = DAG.getNode(X86ISD::PSHUFHW, DL, VT, V,
8992 getV4X86ShuffleImm8ForMask(PSHUFHMask, DL, DAG));
8993 if (!isNoopShuffleMask(PSHUFDMask))
8996 DAG.getNode(X86ISD::PSHUFD, DL, PSHUFDVT, DAG.getBitcast(PSHUFDVT, V),
8997 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
8999 // At this point, each half should contain all its inputs, and we can then
9000 // just shuffle them into their final position.
9001 assert(std::count_if(LoMask.begin(), LoMask.end(),
9002 [](int M) { return M >= 4; }) == 0 &&
9003 "Failed to lift all the high half inputs to the low mask!");
9004 assert(std::count_if(HiMask.begin(), HiMask.end(),
9005 [](int M) { return M >= 0 && M < 4; }) == 0 &&
9006 "Failed to lift all the low half inputs to the high mask!");
9008 // Do a half shuffle for the low mask.
9009 if (!isNoopShuffleMask(LoMask))
9010 V = DAG.getNode(X86ISD::PSHUFLW, DL, VT, V,
9011 getV4X86ShuffleImm8ForMask(LoMask, DL, DAG));
9013 // Do a half shuffle with the high mask after shifting its values down.
9014 for (int &M : HiMask)
9017 if (!isNoopShuffleMask(HiMask))
9018 V = DAG.getNode(X86ISD::PSHUFHW, DL, VT, V,
9019 getV4X86ShuffleImm8ForMask(HiMask, DL, DAG));
9024 /// \brief Helper to form a PSHUFB-based shuffle+blend.
9025 static SDValue lowerVectorShuffleAsPSHUFB(SDLoc DL, MVT VT, SDValue V1,
9026 SDValue V2, ArrayRef<int> Mask,
9027 SelectionDAG &DAG, bool &V1InUse,
9029 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
9035 int Size = Mask.size();
9036 int Scale = 16 / Size;
9037 for (int i = 0; i < 16; ++i) {
9038 if (Mask[i / Scale] == -1) {
9039 V1Mask[i] = V2Mask[i] = DAG.getUNDEF(MVT::i8);
9041 const int ZeroMask = 0x80;
9042 int V1Idx = Mask[i / Scale] < Size ? Mask[i / Scale] * Scale + i % Scale
9044 int V2Idx = Mask[i / Scale] < Size
9046 : (Mask[i / Scale] - Size) * Scale + i % Scale;
9047 if (Zeroable[i / Scale])
9048 V1Idx = V2Idx = ZeroMask;
9049 V1Mask[i] = DAG.getConstant(V1Idx, DL, MVT::i8);
9050 V2Mask[i] = DAG.getConstant(V2Idx, DL, MVT::i8);
9051 V1InUse |= (ZeroMask != V1Idx);
9052 V2InUse |= (ZeroMask != V2Idx);
9057 V1 = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8,
9058 DAG.getBitcast(MVT::v16i8, V1),
9059 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v16i8, V1Mask));
9061 V2 = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8,
9062 DAG.getBitcast(MVT::v16i8, V2),
9063 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v16i8, V2Mask));
9065 // If we need shuffled inputs from both, blend the two.
9067 if (V1InUse && V2InUse)
9068 V = DAG.getNode(ISD::OR, DL, MVT::v16i8, V1, V2);
9070 V = V1InUse ? V1 : V2;
9072 // Cast the result back to the correct type.
9073 return DAG.getBitcast(VT, V);
9076 /// \brief Generic lowering of 8-lane i16 shuffles.
9078 /// This handles both single-input shuffles and combined shuffle/blends with
9079 /// two inputs. The single input shuffles are immediately delegated to
9080 /// a dedicated lowering routine.
9082 /// The blends are lowered in one of three fundamental ways. If there are few
9083 /// enough inputs, it delegates to a basic UNPCK-based strategy. If the shuffle
9084 /// of the input is significantly cheaper when lowered as an interleaving of
9085 /// the two inputs, try to interleave them. Otherwise, blend the low and high
9086 /// halves of the inputs separately (making them have relatively few inputs)
9087 /// and then concatenate them.
9088 static SDValue lowerV8I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9089 const X86Subtarget *Subtarget,
9090 SelectionDAG &DAG) {
9092 assert(Op.getSimpleValueType() == MVT::v8i16 && "Bad shuffle type!");
9093 assert(V1.getSimpleValueType() == MVT::v8i16 && "Bad operand type!");
9094 assert(V2.getSimpleValueType() == MVT::v8i16 && "Bad operand type!");
9095 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
9096 ArrayRef<int> OrigMask = SVOp->getMask();
9097 int MaskStorage[8] = {OrigMask[0], OrigMask[1], OrigMask[2], OrigMask[3],
9098 OrigMask[4], OrigMask[5], OrigMask[6], OrigMask[7]};
9099 MutableArrayRef<int> Mask(MaskStorage);
9101 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
9103 // Whenever we can lower this as a zext, that instruction is strictly faster
9104 // than any alternative.
9105 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(
9106 DL, MVT::v8i16, V1, V2, OrigMask, Subtarget, DAG))
9109 auto isV1 = [](int M) { return M >= 0 && M < 8; };
9111 auto isV2 = [](int M) { return M >= 8; };
9113 int NumV2Inputs = std::count_if(Mask.begin(), Mask.end(), isV2);
9115 if (NumV2Inputs == 0) {
9116 // Check for being able to broadcast a single element.
9117 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8i16, V1,
9118 Mask, Subtarget, DAG))
9121 // Try to use shift instructions.
9123 lowerVectorShuffleAsShift(DL, MVT::v8i16, V1, V1, Mask, DAG))
9126 // Use dedicated unpack instructions for masks that match their pattern.
9127 if (isShuffleEquivalent(V1, V1, Mask, {0, 0, 1, 1, 2, 2, 3, 3}))
9128 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8i16, V1, V1);
9129 if (isShuffleEquivalent(V1, V1, Mask, {4, 4, 5, 5, 6, 6, 7, 7}))
9130 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8i16, V1, V1);
9132 // Try to use byte rotation instructions.
9133 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(DL, MVT::v8i16, V1, V1,
9134 Mask, Subtarget, DAG))
9137 return lowerV8I16GeneralSingleInputVectorShuffle(DL, MVT::v8i16, V1, Mask,
9141 assert(std::any_of(Mask.begin(), Mask.end(), isV1) &&
9142 "All single-input shuffles should be canonicalized to be V1-input "
9145 // Try to use shift instructions.
9147 lowerVectorShuffleAsShift(DL, MVT::v8i16, V1, V2, Mask, DAG))
9150 // See if we can use SSE4A Extraction / Insertion.
9151 if (Subtarget->hasSSE4A())
9152 if (SDValue V = lowerVectorShuffleWithSSE4A(DL, MVT::v8i16, V1, V2, Mask, DAG))
9155 // There are special ways we can lower some single-element blends.
9156 if (NumV2Inputs == 1)
9157 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v8i16, V1, V2,
9158 Mask, Subtarget, DAG))
9161 // We have different paths for blend lowering, but they all must use the
9162 // *exact* same predicate.
9163 bool IsBlendSupported = Subtarget->hasSSE41();
9164 if (IsBlendSupported)
9165 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8i16, V1, V2, Mask,
9169 if (SDValue Masked =
9170 lowerVectorShuffleAsBitMask(DL, MVT::v8i16, V1, V2, Mask, DAG))
9173 // Use dedicated unpack instructions for masks that match their pattern.
9174 if (isShuffleEquivalent(V1, V2, Mask, {0, 8, 1, 9, 2, 10, 3, 11}))
9175 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8i16, V1, V2);
9176 if (isShuffleEquivalent(V1, V2, Mask, {4, 12, 5, 13, 6, 14, 7, 15}))
9177 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8i16, V1, V2);
9179 // Try to use byte rotation instructions.
9180 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
9181 DL, MVT::v8i16, V1, V2, Mask, Subtarget, DAG))
9184 if (SDValue BitBlend =
9185 lowerVectorShuffleAsBitBlend(DL, MVT::v8i16, V1, V2, Mask, DAG))
9188 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(DL, MVT::v8i16, V1,
9192 // If we can't directly blend but can use PSHUFB, that will be better as it
9193 // can both shuffle and set up the inefficient blend.
9194 if (!IsBlendSupported && Subtarget->hasSSSE3()) {
9195 bool V1InUse, V2InUse;
9196 return lowerVectorShuffleAsPSHUFB(DL, MVT::v8i16, V1, V2, Mask, DAG,
9200 // We can always bit-blend if we have to so the fallback strategy is to
9201 // decompose into single-input permutes and blends.
9202 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8i16, V1, V2,
9206 /// \brief Check whether a compaction lowering can be done by dropping even
9207 /// elements and compute how many times even elements must be dropped.
9209 /// This handles shuffles which take every Nth element where N is a power of
9210 /// two. Example shuffle masks:
9212 /// N = 1: 0, 2, 4, 6, 8, 10, 12, 14, 0, 2, 4, 6, 8, 10, 12, 14
9213 /// N = 1: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
9214 /// N = 2: 0, 4, 8, 12, 0, 4, 8, 12, 0, 4, 8, 12, 0, 4, 8, 12
9215 /// N = 2: 0, 4, 8, 12, 16, 20, 24, 28, 0, 4, 8, 12, 16, 20, 24, 28
9216 /// N = 3: 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8
9217 /// N = 3: 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24
9219 /// Any of these lanes can of course be undef.
9221 /// This routine only supports N <= 3.
9222 /// FIXME: Evaluate whether either AVX or AVX-512 have any opportunities here
9225 /// \returns N above, or the number of times even elements must be dropped if
9226 /// there is such a number. Otherwise returns zero.
9227 static int canLowerByDroppingEvenElements(ArrayRef<int> Mask) {
9228 // Figure out whether we're looping over two inputs or just one.
9229 bool IsSingleInput = isSingleInputShuffleMask(Mask);
9231 // The modulus for the shuffle vector entries is based on whether this is
9232 // a single input or not.
9233 int ShuffleModulus = Mask.size() * (IsSingleInput ? 1 : 2);
9234 assert(isPowerOf2_32((uint32_t)ShuffleModulus) &&
9235 "We should only be called with masks with a power-of-2 size!");
9237 uint64_t ModMask = (uint64_t)ShuffleModulus - 1;
9239 // We track whether the input is viable for all power-of-2 strides 2^1, 2^2,
9240 // and 2^3 simultaneously. This is because we may have ambiguity with
9241 // partially undef inputs.
9242 bool ViableForN[3] = {true, true, true};
9244 for (int i = 0, e = Mask.size(); i < e; ++i) {
9245 // Ignore undef lanes, we'll optimistically collapse them to the pattern we
9250 bool IsAnyViable = false;
9251 for (unsigned j = 0; j != array_lengthof(ViableForN); ++j)
9252 if (ViableForN[j]) {
9255 // The shuffle mask must be equal to (i * 2^N) % M.
9256 if ((uint64_t)Mask[i] == (((uint64_t)i << N) & ModMask))
9259 ViableForN[j] = false;
9261 // Early exit if we exhaust the possible powers of two.
9266 for (unsigned j = 0; j != array_lengthof(ViableForN); ++j)
9270 // Return 0 as there is no viable power of two.
9274 /// \brief Generic lowering of v16i8 shuffles.
9276 /// This is a hybrid strategy to lower v16i8 vectors. It first attempts to
9277 /// detect any complexity reducing interleaving. If that doesn't help, it uses
9278 /// UNPCK to spread the i8 elements across two i16-element vectors, and uses
9279 /// the existing lowering for v8i16 blends on each half, finally PACK-ing them
9281 static SDValue lowerV16I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9282 const X86Subtarget *Subtarget,
9283 SelectionDAG &DAG) {
9285 assert(Op.getSimpleValueType() == MVT::v16i8 && "Bad shuffle type!");
9286 assert(V1.getSimpleValueType() == MVT::v16i8 && "Bad operand type!");
9287 assert(V2.getSimpleValueType() == MVT::v16i8 && "Bad operand type!");
9288 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
9289 ArrayRef<int> Mask = SVOp->getMask();
9290 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
9292 // Try to use shift instructions.
9294 lowerVectorShuffleAsShift(DL, MVT::v16i8, V1, V2, Mask, DAG))
9297 // Try to use byte rotation instructions.
9298 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
9299 DL, MVT::v16i8, V1, V2, Mask, Subtarget, DAG))
9302 // Try to use a zext lowering.
9303 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(
9304 DL, MVT::v16i8, V1, V2, Mask, Subtarget, DAG))
9307 // See if we can use SSE4A Extraction / Insertion.
9308 if (Subtarget->hasSSE4A())
9309 if (SDValue V = lowerVectorShuffleWithSSE4A(DL, MVT::v16i8, V1, V2, Mask, DAG))
9313 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 16; });
9315 // For single-input shuffles, there are some nicer lowering tricks we can use.
9316 if (NumV2Elements == 0) {
9317 // Check for being able to broadcast a single element.
9318 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v16i8, V1,
9319 Mask, Subtarget, DAG))
9322 // Check whether we can widen this to an i16 shuffle by duplicating bytes.
9323 // Notably, this handles splat and partial-splat shuffles more efficiently.
9324 // However, it only makes sense if the pre-duplication shuffle simplifies
9325 // things significantly. Currently, this means we need to be able to
9326 // express the pre-duplication shuffle as an i16 shuffle.
9328 // FIXME: We should check for other patterns which can be widened into an
9329 // i16 shuffle as well.
9330 auto canWidenViaDuplication = [](ArrayRef<int> Mask) {
9331 for (int i = 0; i < 16; i += 2)
9332 if (Mask[i] != -1 && Mask[i + 1] != -1 && Mask[i] != Mask[i + 1])
9337 auto tryToWidenViaDuplication = [&]() -> SDValue {
9338 if (!canWidenViaDuplication(Mask))
9340 SmallVector<int, 4> LoInputs;
9341 std::copy_if(Mask.begin(), Mask.end(), std::back_inserter(LoInputs),
9342 [](int M) { return M >= 0 && M < 8; });
9343 std::sort(LoInputs.begin(), LoInputs.end());
9344 LoInputs.erase(std::unique(LoInputs.begin(), LoInputs.end()),
9346 SmallVector<int, 4> HiInputs;
9347 std::copy_if(Mask.begin(), Mask.end(), std::back_inserter(HiInputs),
9348 [](int M) { return M >= 8; });
9349 std::sort(HiInputs.begin(), HiInputs.end());
9350 HiInputs.erase(std::unique(HiInputs.begin(), HiInputs.end()),
9353 bool TargetLo = LoInputs.size() >= HiInputs.size();
9354 ArrayRef<int> InPlaceInputs = TargetLo ? LoInputs : HiInputs;
9355 ArrayRef<int> MovingInputs = TargetLo ? HiInputs : LoInputs;
9357 int PreDupI16Shuffle[] = {-1, -1, -1, -1, -1, -1, -1, -1};
9358 SmallDenseMap<int, int, 8> LaneMap;
9359 for (int I : InPlaceInputs) {
9360 PreDupI16Shuffle[I/2] = I/2;
9363 int j = TargetLo ? 0 : 4, je = j + 4;
9364 for (int i = 0, ie = MovingInputs.size(); i < ie; ++i) {
9365 // Check if j is already a shuffle of this input. This happens when
9366 // there are two adjacent bytes after we move the low one.
9367 if (PreDupI16Shuffle[j] != MovingInputs[i] / 2) {
9368 // If we haven't yet mapped the input, search for a slot into which
9370 while (j < je && PreDupI16Shuffle[j] != -1)
9374 // We can't place the inputs into a single half with a simple i16 shuffle, so bail.
9377 // Map this input with the i16 shuffle.
9378 PreDupI16Shuffle[j] = MovingInputs[i] / 2;
9381 // Update the lane map based on the mapping we ended up with.
9382 LaneMap[MovingInputs[i]] = 2 * j + MovingInputs[i] % 2;
9384 V1 = DAG.getBitcast(
9386 DAG.getVectorShuffle(MVT::v8i16, DL, DAG.getBitcast(MVT::v8i16, V1),
9387 DAG.getUNDEF(MVT::v8i16), PreDupI16Shuffle));
9389 // Unpack the bytes to form the i16s that will be shuffled into place.
9390 V1 = DAG.getNode(TargetLo ? X86ISD::UNPCKL : X86ISD::UNPCKH, DL,
9391 MVT::v16i8, V1, V1);
9393 int PostDupI16Shuffle[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9394 for (int i = 0; i < 16; ++i)
9395 if (Mask[i] != -1) {
9396 int MappedMask = LaneMap[Mask[i]] - (TargetLo ? 0 : 8);
9397 assert(MappedMask < 8 && "Invalid v8 shuffle mask!");
9398 if (PostDupI16Shuffle[i / 2] == -1)
9399 PostDupI16Shuffle[i / 2] = MappedMask;
9401 assert(PostDupI16Shuffle[i / 2] == MappedMask &&
9402 "Conflicting entrties in the original shuffle!");
9404 return DAG.getBitcast(
9406 DAG.getVectorShuffle(MVT::v8i16, DL, DAG.getBitcast(MVT::v8i16, V1),
9407 DAG.getUNDEF(MVT::v8i16), PostDupI16Shuffle));
9409 if (SDValue V = tryToWidenViaDuplication())
9413 if (SDValue Masked =
9414 lowerVectorShuffleAsBitMask(DL, MVT::v16i8, V1, V2, Mask, DAG))
9417 // Use dedicated unpack instructions for masks that match their pattern.
9418 if (isShuffleEquivalent(V1, V2, Mask, {// Low half.
9419 0, 16, 1, 17, 2, 18, 3, 19,
9421 4, 20, 5, 21, 6, 22, 7, 23}))
9422 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V1, V2);
9423 if (isShuffleEquivalent(V1, V2, Mask, {// Low half.
9424 8, 24, 9, 25, 10, 26, 11, 27,
9426 12, 28, 13, 29, 14, 30, 15, 31}))
9427 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V1, V2);
9429 // Check for SSSE3 which lets us lower all v16i8 shuffles much more directly
9430 // with PSHUFB. It is important to do this before we attempt to generate any
9431 // blends but after all of the single-input lowerings. If the single input
9432 // lowerings can find an instruction sequence that is faster than a PSHUFB, we
9433 // want to preserve that and we can DAG combine any longer sequences into
9434 // a PSHUFB in the end. But once we start blending from multiple inputs,
9435 // the complexity of DAG combining bad patterns back into PSHUFB is too high,
9436 // and there are *very* few patterns that would actually be faster than the
9437 // PSHUFB approach because of its ability to zero lanes.
9439 // FIXME: The only exceptions to the above are blends which are exact
9440 // interleavings with direct instructions supporting them. We currently don't
9441 // handle those well here.
9442 if (Subtarget->hasSSSE3()) {
9443 bool V1InUse = false;
9444 bool V2InUse = false;
9446 SDValue PSHUFB = lowerVectorShuffleAsPSHUFB(DL, MVT::v16i8, V1, V2, Mask,
9447 DAG, V1InUse, V2InUse);
9449 // If both V1 and V2 are in use and we can use a direct blend or an unpack,
9450 // do so. This avoids using them to handle blends-with-zero which is
9451 // important as a single pshufb is significantly faster for that.
9452 if (V1InUse && V2InUse) {
9453 if (Subtarget->hasSSE41())
9454 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v16i8, V1, V2,
9455 Mask, Subtarget, DAG))
9458 // We can use an unpack to do the blending rather than an or in some
9459 // cases. Even though the or may be (very minorly) more efficient, we
9460 // preference this lowering because there are common cases where part of
9461 // the complexity of the shuffles goes away when we do the final blend as
9463 // FIXME: It might be worth trying to detect if the unpack-feeding
9464 // shuffles will both be pshufb, in which case we shouldn't bother with
9466 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(
9467 DL, MVT::v16i8, V1, V2, Mask, DAG))
9474 // There are special ways we can lower some single-element blends.
9475 if (NumV2Elements == 1)
9476 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v16i8, V1, V2,
9477 Mask, Subtarget, DAG))
9480 if (SDValue BitBlend =
9481 lowerVectorShuffleAsBitBlend(DL, MVT::v16i8, V1, V2, Mask, DAG))
9484 // Check whether a compaction lowering can be done. This handles shuffles
9485 // which take every Nth element for some even N. See the helper function for
9488 // We special case these as they can be particularly efficiently handled with
9489 // the PACKUSB instruction on x86 and they show up in common patterns of
9490 // rearranging bytes to truncate wide elements.
9491 if (int NumEvenDrops = canLowerByDroppingEvenElements(Mask)) {
9492 // NumEvenDrops is the power of two stride of the elements. Another way of
9493 // thinking about it is that we need to drop the even elements this many
9494 // times to get the original input.
9495 bool IsSingleInput = isSingleInputShuffleMask(Mask);
9497 // First we need to zero all the dropped bytes.
9498 assert(NumEvenDrops <= 3 &&
9499 "No support for dropping even elements more than 3 times.");
9500 // We use the mask type to pick which bytes are preserved based on how many
9501 // elements are dropped.
9502 MVT MaskVTs[] = { MVT::v8i16, MVT::v4i32, MVT::v2i64 };
9503 SDValue ByteClearMask = DAG.getBitcast(
9504 MVT::v16i8, DAG.getConstant(0xFF, DL, MaskVTs[NumEvenDrops - 1]));
9505 V1 = DAG.getNode(ISD::AND, DL, MVT::v16i8, V1, ByteClearMask);
9507 V2 = DAG.getNode(ISD::AND, DL, MVT::v16i8, V2, ByteClearMask);
9509 // Now pack things back together.
9510 V1 = DAG.getBitcast(MVT::v8i16, V1);
9511 V2 = IsSingleInput ? V1 : DAG.getBitcast(MVT::v8i16, V2);
9512 SDValue Result = DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, V1, V2);
9513 for (int i = 1; i < NumEvenDrops; ++i) {
9514 Result = DAG.getBitcast(MVT::v8i16, Result);
9515 Result = DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, Result, Result);
9521 // Handle multi-input cases by blending single-input shuffles.
9522 if (NumV2Elements > 0)
9523 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v16i8, V1, V2,
9526 // The fallback path for single-input shuffles widens this into two v8i16
9527 // vectors with unpacks, shuffles those, and then pulls them back together
9531 int LoBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9532 int HiBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9533 for (int i = 0; i < 16; ++i)
9535 (i < 8 ? LoBlendMask[i] : HiBlendMask[i % 8]) = Mask[i];
9537 SDValue Zero = getZeroVector(MVT::v8i16, Subtarget, DAG, DL);
9539 SDValue VLoHalf, VHiHalf;
9540 // Check if any of the odd lanes in the v16i8 are used. If not, we can mask
9541 // them out and avoid using UNPCK{L,H} to extract the elements of V as
9543 if (std::none_of(std::begin(LoBlendMask), std::end(LoBlendMask),
9544 [](int M) { return M >= 0 && M % 2 == 1; }) &&
9545 std::none_of(std::begin(HiBlendMask), std::end(HiBlendMask),
9546 [](int M) { return M >= 0 && M % 2 == 1; })) {
9547 // Use a mask to drop the high bytes.
9548 VLoHalf = DAG.getBitcast(MVT::v8i16, V);
9549 VLoHalf = DAG.getNode(ISD::AND, DL, MVT::v8i16, VLoHalf,
9550 DAG.getConstant(0x00FF, DL, MVT::v8i16));
9552 // This will be a single vector shuffle instead of a blend so nuke VHiHalf.
9553 VHiHalf = DAG.getUNDEF(MVT::v8i16);
9555 // Squash the masks to point directly into VLoHalf.
9556 for (int &M : LoBlendMask)
9559 for (int &M : HiBlendMask)
9563 // Otherwise just unpack the low half of V into VLoHalf and the high half into
9564 // VHiHalf so that we can blend them as i16s.
9565 VLoHalf = DAG.getBitcast(
9566 MVT::v8i16, DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V, Zero));
9567 VHiHalf = DAG.getBitcast(
9568 MVT::v8i16, DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V, Zero));
9571 SDValue LoV = DAG.getVectorShuffle(MVT::v8i16, DL, VLoHalf, VHiHalf, LoBlendMask);
9572 SDValue HiV = DAG.getVectorShuffle(MVT::v8i16, DL, VLoHalf, VHiHalf, HiBlendMask);
9574 return DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, LoV, HiV);
9577 /// \brief Dispatching routine to lower various 128-bit x86 vector shuffles.
9579 /// This routine breaks down the specific type of 128-bit shuffle and
9580 /// dispatches to the lowering routines accordingly.
9581 static SDValue lower128BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9582 MVT VT, const X86Subtarget *Subtarget,
9583 SelectionDAG &DAG) {
9584 switch (VT.SimpleTy) {
9586 return lowerV2I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
9588 return lowerV2F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
9590 return lowerV4I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
9592 return lowerV4F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
9594 return lowerV8I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
9596 return lowerV16I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
9599 llvm_unreachable("Unimplemented!");
9603 /// \brief Helper function to test whether a shuffle mask could be
9604 /// simplified by widening the elements being shuffled.
9606 /// Appends the mask for wider elements in WidenedMask if valid. Otherwise
9607 /// leaves it in an unspecified state.
9609 /// NOTE: This must handle normal vector shuffle masks and *target* vector
9610 /// shuffle masks. The latter have the special property of a '-2' representing
9611 /// a zero-ed lane of a vector.
9612 static bool canWidenShuffleElements(ArrayRef<int> Mask,
9613 SmallVectorImpl<int> &WidenedMask) {
9614 for (int i = 0, Size = Mask.size(); i < Size; i += 2) {
9615 // If both elements are undef, its trivial.
9616 if (Mask[i] == SM_SentinelUndef && Mask[i + 1] == SM_SentinelUndef) {
9617 WidenedMask.push_back(SM_SentinelUndef);
9621 // Check for an undef mask and a mask value properly aligned to fit with
9622 // a pair of values. If we find such a case, use the non-undef mask's value.
9623 if (Mask[i] == SM_SentinelUndef && Mask[i + 1] >= 0 && Mask[i + 1] % 2 == 1) {
9624 WidenedMask.push_back(Mask[i + 1] / 2);
9627 if (Mask[i + 1] == SM_SentinelUndef && Mask[i] >= 0 && Mask[i] % 2 == 0) {
9628 WidenedMask.push_back(Mask[i] / 2);
9632 // When zeroing, we need to spread the zeroing across both lanes to widen.
9633 if (Mask[i] == SM_SentinelZero || Mask[i + 1] == SM_SentinelZero) {
9634 if ((Mask[i] == SM_SentinelZero || Mask[i] == SM_SentinelUndef) &&
9635 (Mask[i + 1] == SM_SentinelZero || Mask[i + 1] == SM_SentinelUndef)) {
9636 WidenedMask.push_back(SM_SentinelZero);
9642 // Finally check if the two mask values are adjacent and aligned with
9644 if (Mask[i] != SM_SentinelUndef && Mask[i] % 2 == 0 && Mask[i] + 1 == Mask[i + 1]) {
9645 WidenedMask.push_back(Mask[i] / 2);
9649 // Otherwise we can't safely widen the elements used in this shuffle.
9652 assert(WidenedMask.size() == Mask.size() / 2 &&
9653 "Incorrect size of mask after widening the elements!");
9658 /// \brief Generic routine to split vector shuffle into half-sized shuffles.
9660 /// This routine just extracts two subvectors, shuffles them independently, and
9661 /// then concatenates them back together. This should work effectively with all
9662 /// AVX vector shuffle types.
9663 static SDValue splitAndLowerVectorShuffle(SDLoc DL, MVT VT, SDValue V1,
9664 SDValue V2, ArrayRef<int> Mask,
9665 SelectionDAG &DAG) {
9666 assert(VT.getSizeInBits() >= 256 &&
9667 "Only for 256-bit or wider vector shuffles!");
9668 assert(V1.getSimpleValueType() == VT && "Bad operand type!");
9669 assert(V2.getSimpleValueType() == VT && "Bad operand type!");
9671 ArrayRef<int> LoMask = Mask.slice(0, Mask.size() / 2);
9672 ArrayRef<int> HiMask = Mask.slice(Mask.size() / 2);
9674 int NumElements = VT.getVectorNumElements();
9675 int SplitNumElements = NumElements / 2;
9676 MVT ScalarVT = VT.getScalarType();
9677 MVT SplitVT = MVT::getVectorVT(ScalarVT, NumElements / 2);
9679 // Rather than splitting build-vectors, just build two narrower build
9680 // vectors. This helps shuffling with splats and zeros.
9681 auto SplitVector = [&](SDValue V) {
9682 while (V.getOpcode() == ISD::BITCAST)
9683 V = V->getOperand(0);
9685 MVT OrigVT = V.getSimpleValueType();
9686 int OrigNumElements = OrigVT.getVectorNumElements();
9687 int OrigSplitNumElements = OrigNumElements / 2;
9688 MVT OrigScalarVT = OrigVT.getScalarType();
9689 MVT OrigSplitVT = MVT::getVectorVT(OrigScalarVT, OrigNumElements / 2);
9693 auto *BV = dyn_cast<BuildVectorSDNode>(V);
9695 LoV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
9696 DAG.getIntPtrConstant(0, DL));
9697 HiV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
9698 DAG.getIntPtrConstant(OrigSplitNumElements, DL));
9701 SmallVector<SDValue, 16> LoOps, HiOps;
9702 for (int i = 0; i < OrigSplitNumElements; ++i) {
9703 LoOps.push_back(BV->getOperand(i));
9704 HiOps.push_back(BV->getOperand(i + OrigSplitNumElements));
9706 LoV = DAG.getNode(ISD::BUILD_VECTOR, DL, OrigSplitVT, LoOps);
9707 HiV = DAG.getNode(ISD::BUILD_VECTOR, DL, OrigSplitVT, HiOps);
9709 return std::make_pair(DAG.getBitcast(SplitVT, LoV),
9710 DAG.getBitcast(SplitVT, HiV));
9713 SDValue LoV1, HiV1, LoV2, HiV2;
9714 std::tie(LoV1, HiV1) = SplitVector(V1);
9715 std::tie(LoV2, HiV2) = SplitVector(V2);
9717 // Now create two 4-way blends of these half-width vectors.
9718 auto HalfBlend = [&](ArrayRef<int> HalfMask) {
9719 bool UseLoV1 = false, UseHiV1 = false, UseLoV2 = false, UseHiV2 = false;
9720 SmallVector<int, 32> V1BlendMask, V2BlendMask, BlendMask;
9721 for (int i = 0; i < SplitNumElements; ++i) {
9722 int M = HalfMask[i];
9723 if (M >= NumElements) {
9724 if (M >= NumElements + SplitNumElements)
9728 V2BlendMask.push_back(M - NumElements);
9729 V1BlendMask.push_back(-1);
9730 BlendMask.push_back(SplitNumElements + i);
9731 } else if (M >= 0) {
9732 if (M >= SplitNumElements)
9736 V2BlendMask.push_back(-1);
9737 V1BlendMask.push_back(M);
9738 BlendMask.push_back(i);
9740 V2BlendMask.push_back(-1);
9741 V1BlendMask.push_back(-1);
9742 BlendMask.push_back(-1);
9746 // Because the lowering happens after all combining takes place, we need to
9747 // manually combine these blend masks as much as possible so that we create
9748 // a minimal number of high-level vector shuffle nodes.
9750 // First try just blending the halves of V1 or V2.
9751 if (!UseLoV1 && !UseHiV1 && !UseLoV2 && !UseHiV2)
9752 return DAG.getUNDEF(SplitVT);
9753 if (!UseLoV2 && !UseHiV2)
9754 return DAG.getVectorShuffle(SplitVT, DL, LoV1, HiV1, V1BlendMask);
9755 if (!UseLoV1 && !UseHiV1)
9756 return DAG.getVectorShuffle(SplitVT, DL, LoV2, HiV2, V2BlendMask);
9758 SDValue V1Blend, V2Blend;
9759 if (UseLoV1 && UseHiV1) {
9761 DAG.getVectorShuffle(SplitVT, DL, LoV1, HiV1, V1BlendMask);
9763 // We only use half of V1 so map the usage down into the final blend mask.
9764 V1Blend = UseLoV1 ? LoV1 : HiV1;
9765 for (int i = 0; i < SplitNumElements; ++i)
9766 if (BlendMask[i] >= 0 && BlendMask[i] < SplitNumElements)
9767 BlendMask[i] = V1BlendMask[i] - (UseLoV1 ? 0 : SplitNumElements);
9769 if (UseLoV2 && UseHiV2) {
9771 DAG.getVectorShuffle(SplitVT, DL, LoV2, HiV2, V2BlendMask);
9773 // We only use half of V2 so map the usage down into the final blend mask.
9774 V2Blend = UseLoV2 ? LoV2 : HiV2;
9775 for (int i = 0; i < SplitNumElements; ++i)
9776 if (BlendMask[i] >= SplitNumElements)
9777 BlendMask[i] = V2BlendMask[i] + (UseLoV2 ? SplitNumElements : 0);
9779 return DAG.getVectorShuffle(SplitVT, DL, V1Blend, V2Blend, BlendMask);
9781 SDValue Lo = HalfBlend(LoMask);
9782 SDValue Hi = HalfBlend(HiMask);
9783 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, Lo, Hi);
9786 /// \brief Either split a vector in halves or decompose the shuffles and the
9789 /// This is provided as a good fallback for many lowerings of non-single-input
9790 /// shuffles with more than one 128-bit lane. In those cases, we want to select
9791 /// between splitting the shuffle into 128-bit components and stitching those
9792 /// back together vs. extracting the single-input shuffles and blending those
9794 static SDValue lowerVectorShuffleAsSplitOrBlend(SDLoc DL, MVT VT, SDValue V1,
9795 SDValue V2, ArrayRef<int> Mask,
9796 SelectionDAG &DAG) {
9797 assert(!isSingleInputShuffleMask(Mask) && "This routine must not be used to "
9798 "lower single-input shuffles as it "
9799 "could then recurse on itself.");
9800 int Size = Mask.size();
9802 // If this can be modeled as a broadcast of two elements followed by a blend,
9803 // prefer that lowering. This is especially important because broadcasts can
9804 // often fold with memory operands.
9805 auto DoBothBroadcast = [&] {
9806 int V1BroadcastIdx = -1, V2BroadcastIdx = -1;
9809 if (V2BroadcastIdx == -1)
9810 V2BroadcastIdx = M - Size;
9811 else if (M - Size != V2BroadcastIdx)
9813 } else if (M >= 0) {
9814 if (V1BroadcastIdx == -1)
9816 else if (M != V1BroadcastIdx)
9821 if (DoBothBroadcast())
9822 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask,
9825 // If the inputs all stem from a single 128-bit lane of each input, then we
9826 // split them rather than blending because the split will decompose to
9827 // unusually few instructions.
9828 int LaneCount = VT.getSizeInBits() / 128;
9829 int LaneSize = Size / LaneCount;
9830 SmallBitVector LaneInputs[2];
9831 LaneInputs[0].resize(LaneCount, false);
9832 LaneInputs[1].resize(LaneCount, false);
9833 for (int i = 0; i < Size; ++i)
9835 LaneInputs[Mask[i] / Size][(Mask[i] % Size) / LaneSize] = true;
9836 if (LaneInputs[0].count() <= 1 && LaneInputs[1].count() <= 1)
9837 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
9839 // Otherwise, just fall back to decomposed shuffles and a blend. This requires
9840 // that the decomposed single-input shuffles don't end up here.
9841 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask, DAG);
9844 /// \brief Lower a vector shuffle crossing multiple 128-bit lanes as
9845 /// a permutation and blend of those lanes.
9847 /// This essentially blends the out-of-lane inputs to each lane into the lane
9848 /// from a permuted copy of the vector. This lowering strategy results in four
9849 /// instructions in the worst case for a single-input cross lane shuffle which
9850 /// is lower than any other fully general cross-lane shuffle strategy I'm aware
9851 /// of. Special cases for each particular shuffle pattern should be handled
9852 /// prior to trying this lowering.
9853 static SDValue lowerVectorShuffleAsLanePermuteAndBlend(SDLoc DL, MVT VT,
9854 SDValue V1, SDValue V2,
9856 SelectionDAG &DAG) {
9857 // FIXME: This should probably be generalized for 512-bit vectors as well.
9858 assert(VT.getSizeInBits() == 256 && "Only for 256-bit vector shuffles!");
9859 int LaneSize = Mask.size() / 2;
9861 // If there are only inputs from one 128-bit lane, splitting will in fact be
9862 // less expensive. The flags track whether the given lane contains an element
9863 // that crosses to another lane.
9864 bool LaneCrossing[2] = {false, false};
9865 for (int i = 0, Size = Mask.size(); i < Size; ++i)
9866 if (Mask[i] >= 0 && (Mask[i] % Size) / LaneSize != i / LaneSize)
9867 LaneCrossing[(Mask[i] % Size) / LaneSize] = true;
9868 if (!LaneCrossing[0] || !LaneCrossing[1])
9869 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
9871 if (isSingleInputShuffleMask(Mask)) {
9872 SmallVector<int, 32> FlippedBlendMask;
9873 for (int i = 0, Size = Mask.size(); i < Size; ++i)
9874 FlippedBlendMask.push_back(
9875 Mask[i] < 0 ? -1 : (((Mask[i] % Size) / LaneSize == i / LaneSize)
9877 : Mask[i] % LaneSize +
9878 (i / LaneSize) * LaneSize + Size));
9880 // Flip the vector, and blend the results which should now be in-lane. The
9881 // VPERM2X128 mask uses the low 2 bits for the low source and bits 4 and
9882 // 5 for the high source. The value 3 selects the high half of source 2 and
9883 // the value 2 selects the low half of source 2. We only use source 2 to
9884 // allow folding it into a memory operand.
9885 unsigned PERMMask = 3 | 2 << 4;
9886 SDValue Flipped = DAG.getNode(X86ISD::VPERM2X128, DL, VT, DAG.getUNDEF(VT),
9887 V1, DAG.getConstant(PERMMask, DL, MVT::i8));
9888 return DAG.getVectorShuffle(VT, DL, V1, Flipped, FlippedBlendMask);
9891 // This now reduces to two single-input shuffles of V1 and V2 which at worst
9892 // will be handled by the above logic and a blend of the results, much like
9893 // other patterns in AVX.
9894 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask, DAG);
9897 /// \brief Handle lowering 2-lane 128-bit shuffles.
9898 static SDValue lowerV2X128VectorShuffle(SDLoc DL, MVT VT, SDValue V1,
9899 SDValue V2, ArrayRef<int> Mask,
9900 const X86Subtarget *Subtarget,
9901 SelectionDAG &DAG) {
9902 // TODO: If minimizing size and one of the inputs is a zero vector and the
9903 // the zero vector has only one use, we could use a VPERM2X128 to save the
9904 // instruction bytes needed to explicitly generate the zero vector.
9906 // Blends are faster and handle all the non-lane-crossing cases.
9907 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, VT, V1, V2, Mask,
9911 bool IsV1Zero = ISD::isBuildVectorAllZeros(V1.getNode());
9912 bool IsV2Zero = ISD::isBuildVectorAllZeros(V2.getNode());
9914 // If either input operand is a zero vector, use VPERM2X128 because its mask
9915 // allows us to replace the zero input with an implicit zero.
9916 if (!IsV1Zero && !IsV2Zero) {
9917 // Check for patterns which can be matched with a single insert of a 128-bit
9919 bool OnlyUsesV1 = isShuffleEquivalent(V1, V2, Mask, {0, 1, 0, 1});
9920 if (OnlyUsesV1 || isShuffleEquivalent(V1, V2, Mask, {0, 1, 4, 5})) {
9921 MVT SubVT = MVT::getVectorVT(VT.getVectorElementType(),
9922 VT.getVectorNumElements() / 2);
9923 SDValue LoV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SubVT, V1,
9924 DAG.getIntPtrConstant(0, DL));
9925 SDValue HiV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SubVT,
9926 OnlyUsesV1 ? V1 : V2,
9927 DAG.getIntPtrConstant(0, DL));
9928 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, LoV, HiV);
9932 // Otherwise form a 128-bit permutation. After accounting for undefs,
9933 // convert the 64-bit shuffle mask selection values into 128-bit
9934 // selection bits by dividing the indexes by 2 and shifting into positions
9935 // defined by a vperm2*128 instruction's immediate control byte.
9937 // The immediate permute control byte looks like this:
9938 // [1:0] - select 128 bits from sources for low half of destination
9940 // [3] - zero low half of destination
9941 // [5:4] - select 128 bits from sources for high half of destination
9943 // [7] - zero high half of destination
9945 int MaskLO = Mask[0];
9946 if (MaskLO == SM_SentinelUndef)
9947 MaskLO = Mask[1] == SM_SentinelUndef ? 0 : Mask[1];
9949 int MaskHI = Mask[2];
9950 if (MaskHI == SM_SentinelUndef)
9951 MaskHI = Mask[3] == SM_SentinelUndef ? 0 : Mask[3];
9953 unsigned PermMask = MaskLO / 2 | (MaskHI / 2) << 4;
9955 // If either input is a zero vector, replace it with an undef input.
9956 // Shuffle mask values < 4 are selecting elements of V1.
9957 // Shuffle mask values >= 4 are selecting elements of V2.
9958 // Adjust each half of the permute mask by clearing the half that was
9959 // selecting the zero vector and setting the zero mask bit.
9961 V1 = DAG.getUNDEF(VT);
9963 PermMask = (PermMask & 0xf0) | 0x08;
9965 PermMask = (PermMask & 0x0f) | 0x80;
9968 V2 = DAG.getUNDEF(VT);
9970 PermMask = (PermMask & 0xf0) | 0x08;
9972 PermMask = (PermMask & 0x0f) | 0x80;
9975 return DAG.getNode(X86ISD::VPERM2X128, DL, VT, V1, V2,
9976 DAG.getConstant(PermMask, DL, MVT::i8));
9979 /// \brief Lower a vector shuffle by first fixing the 128-bit lanes and then
9980 /// shuffling each lane.
9982 /// This will only succeed when the result of fixing the 128-bit lanes results
9983 /// in a single-input non-lane-crossing shuffle with a repeating shuffle mask in
9984 /// each 128-bit lanes. This handles many cases where we can quickly blend away
9985 /// the lane crosses early and then use simpler shuffles within each lane.
9987 /// FIXME: It might be worthwhile at some point to support this without
9988 /// requiring the 128-bit lane-relative shuffles to be repeating, but currently
9989 /// in x86 only floating point has interesting non-repeating shuffles, and even
9990 /// those are still *marginally* more expensive.
9991 static SDValue lowerVectorShuffleByMerging128BitLanes(
9992 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
9993 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
9994 assert(!isSingleInputShuffleMask(Mask) &&
9995 "This is only useful with multiple inputs.");
9997 int Size = Mask.size();
9998 int LaneSize = 128 / VT.getScalarSizeInBits();
9999 int NumLanes = Size / LaneSize;
10000 assert(NumLanes > 1 && "Only handles 256-bit and wider shuffles.");
10002 // See if we can build a hypothetical 128-bit lane-fixing shuffle mask. Also
10003 // check whether the in-128-bit lane shuffles share a repeating pattern.
10004 SmallVector<int, 4> Lanes;
10005 Lanes.resize(NumLanes, -1);
10006 SmallVector<int, 4> InLaneMask;
10007 InLaneMask.resize(LaneSize, -1);
10008 for (int i = 0; i < Size; ++i) {
10012 int j = i / LaneSize;
10014 if (Lanes[j] < 0) {
10015 // First entry we've seen for this lane.
10016 Lanes[j] = Mask[i] / LaneSize;
10017 } else if (Lanes[j] != Mask[i] / LaneSize) {
10018 // This doesn't match the lane selected previously!
10022 // Check that within each lane we have a consistent shuffle mask.
10023 int k = i % LaneSize;
10024 if (InLaneMask[k] < 0) {
10025 InLaneMask[k] = Mask[i] % LaneSize;
10026 } else if (InLaneMask[k] != Mask[i] % LaneSize) {
10027 // This doesn't fit a repeating in-lane mask.
10032 // First shuffle the lanes into place.
10033 MVT LaneVT = MVT::getVectorVT(VT.isFloatingPoint() ? MVT::f64 : MVT::i64,
10034 VT.getSizeInBits() / 64);
10035 SmallVector<int, 8> LaneMask;
10036 LaneMask.resize(NumLanes * 2, -1);
10037 for (int i = 0; i < NumLanes; ++i)
10038 if (Lanes[i] >= 0) {
10039 LaneMask[2 * i + 0] = 2*Lanes[i] + 0;
10040 LaneMask[2 * i + 1] = 2*Lanes[i] + 1;
10043 V1 = DAG.getBitcast(LaneVT, V1);
10044 V2 = DAG.getBitcast(LaneVT, V2);
10045 SDValue LaneShuffle = DAG.getVectorShuffle(LaneVT, DL, V1, V2, LaneMask);
10047 // Cast it back to the type we actually want.
10048 LaneShuffle = DAG.getBitcast(VT, LaneShuffle);
10050 // Now do a simple shuffle that isn't lane crossing.
10051 SmallVector<int, 8> NewMask;
10052 NewMask.resize(Size, -1);
10053 for (int i = 0; i < Size; ++i)
10055 NewMask[i] = (i / LaneSize) * LaneSize + Mask[i] % LaneSize;
10056 assert(!is128BitLaneCrossingShuffleMask(VT, NewMask) &&
10057 "Must not introduce lane crosses at this point!");
10059 return DAG.getVectorShuffle(VT, DL, LaneShuffle, DAG.getUNDEF(VT), NewMask);
10062 /// \brief Test whether the specified input (0 or 1) is in-place blended by the
10065 /// This returns true if the elements from a particular input are already in the
10066 /// slot required by the given mask and require no permutation.
10067 static bool isShuffleMaskInputInPlace(int Input, ArrayRef<int> Mask) {
10068 assert((Input == 0 || Input == 1) && "Only two inputs to shuffles.");
10069 int Size = Mask.size();
10070 for (int i = 0; i < Size; ++i)
10071 if (Mask[i] >= 0 && Mask[i] / Size == Input && Mask[i] % Size != i)
10077 static SDValue lowerVectorShuffleWithSHUFPD(SDLoc DL, MVT VT,
10078 ArrayRef<int> Mask, SDValue V1,
10079 SDValue V2, SelectionDAG &DAG) {
10081 // Mask for V8F64: 0/1, 8/9, 2/3, 10/11, 4/5, ..
10082 // Mask for V4F64; 0/1, 4/5, 2/3, 6/7..
10083 assert(VT.getScalarSizeInBits() == 64 && "Unexpected data type for VSHUFPD");
10084 int NumElts = VT.getVectorNumElements();
10085 bool ShufpdMask = true;
10086 bool CommutableMask = true;
10087 unsigned Immediate = 0;
10088 for (int i = 0; i < NumElts; ++i) {
10091 int Val = (i & 6) + NumElts * (i & 1);
10092 int CommutVal = (i & 0xe) + NumElts * ((i & 1)^1);
10093 if (Mask[i] < Val || Mask[i] > Val + 1)
10094 ShufpdMask = false;
10095 if (Mask[i] < CommutVal || Mask[i] > CommutVal + 1)
10096 CommutableMask = false;
10097 Immediate |= (Mask[i] % 2) << i;
10100 return DAG.getNode(X86ISD::SHUFP, DL, VT, V1, V2,
10101 DAG.getConstant(Immediate, DL, MVT::i8));
10102 if (CommutableMask)
10103 return DAG.getNode(X86ISD::SHUFP, DL, VT, V2, V1,
10104 DAG.getConstant(Immediate, DL, MVT::i8));
10108 /// \brief Handle lowering of 4-lane 64-bit floating point shuffles.
10110 /// Also ends up handling lowering of 4-lane 64-bit integer shuffles when AVX2
10111 /// isn't available.
10112 static SDValue lowerV4F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10113 const X86Subtarget *Subtarget,
10114 SelectionDAG &DAG) {
10116 assert(V1.getSimpleValueType() == MVT::v4f64 && "Bad operand type!");
10117 assert(V2.getSimpleValueType() == MVT::v4f64 && "Bad operand type!");
10118 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10119 ArrayRef<int> Mask = SVOp->getMask();
10120 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
10122 SmallVector<int, 4> WidenedMask;
10123 if (canWidenShuffleElements(Mask, WidenedMask))
10124 return lowerV2X128VectorShuffle(DL, MVT::v4f64, V1, V2, Mask, Subtarget,
10127 if (isSingleInputShuffleMask(Mask)) {
10128 // Check for being able to broadcast a single element.
10129 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4f64, V1,
10130 Mask, Subtarget, DAG))
10133 // Use low duplicate instructions for masks that match their pattern.
10134 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2}))
10135 return DAG.getNode(X86ISD::MOVDDUP, DL, MVT::v4f64, V1);
10137 if (!is128BitLaneCrossingShuffleMask(MVT::v4f64, Mask)) {
10138 // Non-half-crossing single input shuffles can be lowerid with an
10139 // interleaved permutation.
10140 unsigned VPERMILPMask = (Mask[0] == 1) | ((Mask[1] == 1) << 1) |
10141 ((Mask[2] == 3) << 2) | ((Mask[3] == 3) << 3);
10142 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v4f64, V1,
10143 DAG.getConstant(VPERMILPMask, DL, MVT::i8));
10146 // With AVX2 we have direct support for this permutation.
10147 if (Subtarget->hasAVX2())
10148 return DAG.getNode(X86ISD::VPERMI, DL, MVT::v4f64, V1,
10149 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
10151 // Otherwise, fall back.
10152 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v4f64, V1, V2, Mask,
10156 // X86 has dedicated unpack instructions that can handle specific blend
10157 // operations: UNPCKH and UNPCKL.
10158 if (isShuffleEquivalent(V1, V2, Mask, {0, 4, 2, 6}))
10159 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4f64, V1, V2);
10160 if (isShuffleEquivalent(V1, V2, Mask, {1, 5, 3, 7}))
10161 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4f64, V1, V2);
10162 if (isShuffleEquivalent(V1, V2, Mask, {4, 0, 6, 2}))
10163 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4f64, V2, V1);
10164 if (isShuffleEquivalent(V1, V2, Mask, {5, 1, 7, 3}))
10165 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4f64, V2, V1);
10167 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4f64, V1, V2, Mask,
10171 // Check if the blend happens to exactly fit that of SHUFPD.
10173 lowerVectorShuffleWithSHUFPD(DL, MVT::v4f64, Mask, V1, V2, DAG))
10176 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10177 // shuffle. However, if we have AVX2 and either inputs are already in place,
10178 // we will be able to shuffle even across lanes the other input in a single
10179 // instruction so skip this pattern.
10180 if (!(Subtarget->hasAVX2() && (isShuffleMaskInputInPlace(0, Mask) ||
10181 isShuffleMaskInputInPlace(1, Mask))))
10182 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10183 DL, MVT::v4f64, V1, V2, Mask, Subtarget, DAG))
10186 // If we have AVX2 then we always want to lower with a blend because an v4 we
10187 // can fully permute the elements.
10188 if (Subtarget->hasAVX2())
10189 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4f64, V1, V2,
10192 // Otherwise fall back on generic lowering.
10193 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v4f64, V1, V2, Mask, DAG);
10196 /// \brief Handle lowering of 4-lane 64-bit integer shuffles.
10198 /// This routine is only called when we have AVX2 and thus a reasonable
10199 /// instruction set for v4i64 shuffling..
10200 static SDValue lowerV4I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10201 const X86Subtarget *Subtarget,
10202 SelectionDAG &DAG) {
10204 assert(V1.getSimpleValueType() == MVT::v4i64 && "Bad operand type!");
10205 assert(V2.getSimpleValueType() == MVT::v4i64 && "Bad operand type!");
10206 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10207 ArrayRef<int> Mask = SVOp->getMask();
10208 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
10209 assert(Subtarget->hasAVX2() && "We can only lower v4i64 with AVX2!");
10211 SmallVector<int, 4> WidenedMask;
10212 if (canWidenShuffleElements(Mask, WidenedMask))
10213 return lowerV2X128VectorShuffle(DL, MVT::v4i64, V1, V2, Mask, Subtarget,
10216 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4i64, V1, V2, Mask,
10220 // Check for being able to broadcast a single element.
10221 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4i64, V1,
10222 Mask, Subtarget, DAG))
10225 // When the shuffle is mirrored between the 128-bit lanes of the unit, we can
10226 // use lower latency instructions that will operate on both 128-bit lanes.
10227 SmallVector<int, 2> RepeatedMask;
10228 if (is128BitLaneRepeatedShuffleMask(MVT::v4i64, Mask, RepeatedMask)) {
10229 if (isSingleInputShuffleMask(Mask)) {
10230 int PSHUFDMask[] = {-1, -1, -1, -1};
10231 for (int i = 0; i < 2; ++i)
10232 if (RepeatedMask[i] >= 0) {
10233 PSHUFDMask[2 * i] = 2 * RepeatedMask[i];
10234 PSHUFDMask[2 * i + 1] = 2 * RepeatedMask[i] + 1;
10236 return DAG.getBitcast(
10238 DAG.getNode(X86ISD::PSHUFD, DL, MVT::v8i32,
10239 DAG.getBitcast(MVT::v8i32, V1),
10240 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
10244 // AVX2 provides a direct instruction for permuting a single input across
10246 if (isSingleInputShuffleMask(Mask))
10247 return DAG.getNode(X86ISD::VPERMI, DL, MVT::v4i64, V1,
10248 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
10250 // Try to use shift instructions.
10251 if (SDValue Shift =
10252 lowerVectorShuffleAsShift(DL, MVT::v4i64, V1, V2, Mask, DAG))
10255 // Use dedicated unpack instructions for masks that match their pattern.
10256 if (isShuffleEquivalent(V1, V2, Mask, {0, 4, 2, 6}))
10257 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4i64, V1, V2);
10258 if (isShuffleEquivalent(V1, V2, Mask, {1, 5, 3, 7}))
10259 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4i64, V1, V2);
10260 if (isShuffleEquivalent(V1, V2, Mask, {4, 0, 6, 2}))
10261 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v4i64, V2, V1);
10262 if (isShuffleEquivalent(V1, V2, Mask, {5, 1, 7, 3}))
10263 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v4i64, V2, V1);
10265 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10266 // shuffle. However, if we have AVX2 and either inputs are already in place,
10267 // we will be able to shuffle even across lanes the other input in a single
10268 // instruction so skip this pattern.
10269 if (!(Subtarget->hasAVX2() && (isShuffleMaskInputInPlace(0, Mask) ||
10270 isShuffleMaskInputInPlace(1, Mask))))
10271 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10272 DL, MVT::v4i64, V1, V2, Mask, Subtarget, DAG))
10275 // Otherwise fall back on generic blend lowering.
10276 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4i64, V1, V2,
10280 /// \brief Handle lowering of 8-lane 32-bit floating point shuffles.
10282 /// Also ends up handling lowering of 8-lane 32-bit integer shuffles when AVX2
10283 /// isn't available.
10284 static SDValue lowerV8F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10285 const X86Subtarget *Subtarget,
10286 SelectionDAG &DAG) {
10288 assert(V1.getSimpleValueType() == MVT::v8f32 && "Bad operand type!");
10289 assert(V2.getSimpleValueType() == MVT::v8f32 && "Bad operand type!");
10290 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10291 ArrayRef<int> Mask = SVOp->getMask();
10292 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10294 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8f32, V1, V2, Mask,
10298 // Check for being able to broadcast a single element.
10299 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8f32, V1,
10300 Mask, Subtarget, DAG))
10303 // If the shuffle mask is repeated in each 128-bit lane, we have many more
10304 // options to efficiently lower the shuffle.
10305 SmallVector<int, 4> RepeatedMask;
10306 if (is128BitLaneRepeatedShuffleMask(MVT::v8f32, Mask, RepeatedMask)) {
10307 assert(RepeatedMask.size() == 4 &&
10308 "Repeated masks must be half the mask width!");
10310 // Use even/odd duplicate instructions for masks that match their pattern.
10311 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2, 4, 4, 6, 6}))
10312 return DAG.getNode(X86ISD::MOVSLDUP, DL, MVT::v8f32, V1);
10313 if (isShuffleEquivalent(V1, V2, Mask, {1, 1, 3, 3, 5, 5, 7, 7}))
10314 return DAG.getNode(X86ISD::MOVSHDUP, DL, MVT::v8f32, V1);
10316 if (isSingleInputShuffleMask(Mask))
10317 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v8f32, V1,
10318 getV4X86ShuffleImm8ForMask(RepeatedMask, DL, DAG));
10320 // Use dedicated unpack instructions for masks that match their pattern.
10321 if (isShuffleEquivalent(V1, V2, Mask, {0, 8, 1, 9, 4, 12, 5, 13}))
10322 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8f32, V1, V2);
10323 if (isShuffleEquivalent(V1, V2, Mask, {2, 10, 3, 11, 6, 14, 7, 15}))
10324 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8f32, V1, V2);
10325 if (isShuffleEquivalent(V1, V2, Mask, {8, 0, 9, 1, 12, 4, 13, 5}))
10326 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8f32, V2, V1);
10327 if (isShuffleEquivalent(V1, V2, Mask, {10, 2, 11, 3, 14, 6, 15, 7}))
10328 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8f32, V2, V1);
10330 // Otherwise, fall back to a SHUFPS sequence. Here it is important that we
10331 // have already handled any direct blends. We also need to squash the
10332 // repeated mask into a simulated v4f32 mask.
10333 for (int i = 0; i < 4; ++i)
10334 if (RepeatedMask[i] >= 8)
10335 RepeatedMask[i] -= 4;
10336 return lowerVectorShuffleWithSHUFPS(DL, MVT::v8f32, RepeatedMask, V1, V2, DAG);
10339 // If we have a single input shuffle with different shuffle patterns in the
10340 // two 128-bit lanes use the variable mask to VPERMILPS.
10341 if (isSingleInputShuffleMask(Mask)) {
10342 SDValue VPermMask[8];
10343 for (int i = 0; i < 8; ++i)
10344 VPermMask[i] = Mask[i] < 0 ? DAG.getUNDEF(MVT::i32)
10345 : DAG.getConstant(Mask[i], DL, MVT::i32);
10346 if (!is128BitLaneCrossingShuffleMask(MVT::v8f32, Mask))
10347 return DAG.getNode(
10348 X86ISD::VPERMILPV, DL, MVT::v8f32, V1,
10349 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i32, VPermMask));
10351 if (Subtarget->hasAVX2())
10352 return DAG.getNode(
10353 X86ISD::VPERMV, DL, MVT::v8f32,
10354 DAG.getBitcast(MVT::v8f32, DAG.getNode(ISD::BUILD_VECTOR, DL,
10355 MVT::v8i32, VPermMask)),
10358 // Otherwise, fall back.
10359 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v8f32, V1, V2, Mask,
10363 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10365 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10366 DL, MVT::v8f32, V1, V2, Mask, Subtarget, DAG))
10369 // If we have AVX2 then we always want to lower with a blend because at v8 we
10370 // can fully permute the elements.
10371 if (Subtarget->hasAVX2())
10372 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8f32, V1, V2,
10375 // Otherwise fall back on generic lowering.
10376 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v8f32, V1, V2, Mask, DAG);
10379 /// \brief Handle lowering of 8-lane 32-bit integer shuffles.
10381 /// This routine is only called when we have AVX2 and thus a reasonable
10382 /// instruction set for v8i32 shuffling..
10383 static SDValue lowerV8I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10384 const X86Subtarget *Subtarget,
10385 SelectionDAG &DAG) {
10387 assert(V1.getSimpleValueType() == MVT::v8i32 && "Bad operand type!");
10388 assert(V2.getSimpleValueType() == MVT::v8i32 && "Bad operand type!");
10389 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10390 ArrayRef<int> Mask = SVOp->getMask();
10391 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10392 assert(Subtarget->hasAVX2() && "We can only lower v8i32 with AVX2!");
10394 // Whenever we can lower this as a zext, that instruction is strictly faster
10395 // than any alternative. It also allows us to fold memory operands into the
10396 // shuffle in many cases.
10397 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v8i32, V1, V2,
10398 Mask, Subtarget, DAG))
10401 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8i32, V1, V2, Mask,
10405 // Check for being able to broadcast a single element.
10406 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8i32, V1,
10407 Mask, Subtarget, DAG))
10410 // If the shuffle mask is repeated in each 128-bit lane we can use more
10411 // efficient instructions that mirror the shuffles across the two 128-bit
10413 SmallVector<int, 4> RepeatedMask;
10414 if (is128BitLaneRepeatedShuffleMask(MVT::v8i32, Mask, RepeatedMask)) {
10415 assert(RepeatedMask.size() == 4 && "Unexpected repeated mask size!");
10416 if (isSingleInputShuffleMask(Mask))
10417 return DAG.getNode(X86ISD::PSHUFD, DL, MVT::v8i32, V1,
10418 getV4X86ShuffleImm8ForMask(RepeatedMask, DL, DAG));
10420 // Use dedicated unpack instructions for masks that match their pattern.
10421 if (isShuffleEquivalent(V1, V2, Mask, {0, 8, 1, 9, 4, 12, 5, 13}))
10422 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8i32, V1, V2);
10423 if (isShuffleEquivalent(V1, V2, Mask, {2, 10, 3, 11, 6, 14, 7, 15}))
10424 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8i32, V1, V2);
10425 if (isShuffleEquivalent(V1, V2, Mask, {8, 0, 9, 1, 12, 4, 13, 5}))
10426 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v8i32, V2, V1);
10427 if (isShuffleEquivalent(V1, V2, Mask, {10, 2, 11, 3, 14, 6, 15, 7}))
10428 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v8i32, V2, V1);
10431 // Try to use shift instructions.
10432 if (SDValue Shift =
10433 lowerVectorShuffleAsShift(DL, MVT::v8i32, V1, V2, Mask, DAG))
10436 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10437 DL, MVT::v8i32, V1, V2, Mask, Subtarget, DAG))
10440 // If the shuffle patterns aren't repeated but it is a single input, directly
10441 // generate a cross-lane VPERMD instruction.
10442 if (isSingleInputShuffleMask(Mask)) {
10443 SDValue VPermMask[8];
10444 for (int i = 0; i < 8; ++i)
10445 VPermMask[i] = Mask[i] < 0 ? DAG.getUNDEF(MVT::i32)
10446 : DAG.getConstant(Mask[i], DL, MVT::i32);
10447 return DAG.getNode(
10448 X86ISD::VPERMV, DL, MVT::v8i32,
10449 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i32, VPermMask), V1);
10452 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10454 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10455 DL, MVT::v8i32, V1, V2, Mask, Subtarget, DAG))
10458 // Otherwise fall back on generic blend lowering.
10459 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8i32, V1, V2,
10463 /// \brief Handle lowering of 16-lane 16-bit integer shuffles.
10465 /// This routine is only called when we have AVX2 and thus a reasonable
10466 /// instruction set for v16i16 shuffling..
10467 static SDValue lowerV16I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10468 const X86Subtarget *Subtarget,
10469 SelectionDAG &DAG) {
10471 assert(V1.getSimpleValueType() == MVT::v16i16 && "Bad operand type!");
10472 assert(V2.getSimpleValueType() == MVT::v16i16 && "Bad operand type!");
10473 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10474 ArrayRef<int> Mask = SVOp->getMask();
10475 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10476 assert(Subtarget->hasAVX2() && "We can only lower v16i16 with AVX2!");
10478 // Whenever we can lower this as a zext, that instruction is strictly faster
10479 // than any alternative. It also allows us to fold memory operands into the
10480 // shuffle in many cases.
10481 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v16i16, V1, V2,
10482 Mask, Subtarget, DAG))
10485 // Check for being able to broadcast a single element.
10486 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v16i16, V1,
10487 Mask, Subtarget, DAG))
10490 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v16i16, V1, V2, Mask,
10494 // Use dedicated unpack instructions for masks that match their pattern.
10495 if (isShuffleEquivalent(V1, V2, Mask,
10496 {// First 128-bit lane:
10497 0, 16, 1, 17, 2, 18, 3, 19,
10498 // Second 128-bit lane:
10499 8, 24, 9, 25, 10, 26, 11, 27}))
10500 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i16, V1, V2);
10501 if (isShuffleEquivalent(V1, V2, Mask,
10502 {// First 128-bit lane:
10503 4, 20, 5, 21, 6, 22, 7, 23,
10504 // Second 128-bit lane:
10505 12, 28, 13, 29, 14, 30, 15, 31}))
10506 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i16, V1, V2);
10508 // Try to use shift instructions.
10509 if (SDValue Shift =
10510 lowerVectorShuffleAsShift(DL, MVT::v16i16, V1, V2, Mask, DAG))
10513 // Try to use byte rotation instructions.
10514 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10515 DL, MVT::v16i16, V1, V2, Mask, Subtarget, DAG))
10518 if (isSingleInputShuffleMask(Mask)) {
10519 // There are no generalized cross-lane shuffle operations available on i16
10521 if (is128BitLaneCrossingShuffleMask(MVT::v16i16, Mask))
10522 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v16i16, V1, V2,
10525 SmallVector<int, 8> RepeatedMask;
10526 if (is128BitLaneRepeatedShuffleMask(MVT::v16i16, Mask, RepeatedMask)) {
10527 // As this is a single-input shuffle, the repeated mask should be
10528 // a strictly valid v8i16 mask that we can pass through to the v8i16
10529 // lowering to handle even the v16 case.
10530 return lowerV8I16GeneralSingleInputVectorShuffle(
10531 DL, MVT::v16i16, V1, RepeatedMask, Subtarget, DAG);
10534 SDValue PSHUFBMask[32];
10535 for (int i = 0; i < 16; ++i) {
10536 if (Mask[i] == -1) {
10537 PSHUFBMask[2 * i] = PSHUFBMask[2 * i + 1] = DAG.getUNDEF(MVT::i8);
10541 int M = i < 8 ? Mask[i] : Mask[i] - 8;
10542 assert(M >= 0 && M < 8 && "Invalid single-input mask!");
10543 PSHUFBMask[2 * i] = DAG.getConstant(2 * M, DL, MVT::i8);
10544 PSHUFBMask[2 * i + 1] = DAG.getConstant(2 * M + 1, DL, MVT::i8);
10546 return DAG.getBitcast(MVT::v16i16,
10547 DAG.getNode(X86ISD::PSHUFB, DL, MVT::v32i8,
10548 DAG.getBitcast(MVT::v32i8, V1),
10549 DAG.getNode(ISD::BUILD_VECTOR, DL,
10550 MVT::v32i8, PSHUFBMask)));
10553 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10555 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10556 DL, MVT::v16i16, V1, V2, Mask, Subtarget, DAG))
10559 // Otherwise fall back on generic lowering.
10560 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v16i16, V1, V2, Mask, DAG);
10563 /// \brief Handle lowering of 32-lane 8-bit integer shuffles.
10565 /// This routine is only called when we have AVX2 and thus a reasonable
10566 /// instruction set for v32i8 shuffling..
10567 static SDValue lowerV32I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10568 const X86Subtarget *Subtarget,
10569 SelectionDAG &DAG) {
10571 assert(V1.getSimpleValueType() == MVT::v32i8 && "Bad operand type!");
10572 assert(V2.getSimpleValueType() == MVT::v32i8 && "Bad operand type!");
10573 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10574 ArrayRef<int> Mask = SVOp->getMask();
10575 assert(Mask.size() == 32 && "Unexpected mask size for v32 shuffle!");
10576 assert(Subtarget->hasAVX2() && "We can only lower v32i8 with AVX2!");
10578 // Whenever we can lower this as a zext, that instruction is strictly faster
10579 // than any alternative. It also allows us to fold memory operands into the
10580 // shuffle in many cases.
10581 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v32i8, V1, V2,
10582 Mask, Subtarget, DAG))
10585 // Check for being able to broadcast a single element.
10586 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v32i8, V1,
10587 Mask, Subtarget, DAG))
10590 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v32i8, V1, V2, Mask,
10594 // Use dedicated unpack instructions for masks that match their pattern.
10595 // Note that these are repeated 128-bit lane unpacks, not unpacks across all
10597 if (isShuffleEquivalent(
10599 {// First 128-bit lane:
10600 0, 32, 1, 33, 2, 34, 3, 35, 4, 36, 5, 37, 6, 38, 7, 39,
10601 // Second 128-bit lane:
10602 16, 48, 17, 49, 18, 50, 19, 51, 20, 52, 21, 53, 22, 54, 23, 55}))
10603 return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v32i8, V1, V2);
10604 if (isShuffleEquivalent(
10606 {// First 128-bit lane:
10607 8, 40, 9, 41, 10, 42, 11, 43, 12, 44, 13, 45, 14, 46, 15, 47,
10608 // Second 128-bit lane:
10609 24, 56, 25, 57, 26, 58, 27, 59, 28, 60, 29, 61, 30, 62, 31, 63}))
10610 return DAG.getNode(X86ISD::UNPCKH, DL, MVT::v32i8, V1, V2);
10612 // Try to use shift instructions.
10613 if (SDValue Shift =
10614 lowerVectorShuffleAsShift(DL, MVT::v32i8, V1, V2, Mask, DAG))
10617 // Try to use byte rotation instructions.
10618 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10619 DL, MVT::v32i8, V1, V2, Mask, Subtarget, DAG))
10622 if (isSingleInputShuffleMask(Mask)) {
10623 // There are no generalized cross-lane shuffle operations available on i8
10625 if (is128BitLaneCrossingShuffleMask(MVT::v32i8, Mask))
10626 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v32i8, V1, V2,
10629 SDValue PSHUFBMask[32];
10630 for (int i = 0; i < 32; ++i)
10633 ? DAG.getUNDEF(MVT::i8)
10634 : DAG.getConstant(Mask[i] < 16 ? Mask[i] : Mask[i] - 16, DL,
10637 return DAG.getNode(
10638 X86ISD::PSHUFB, DL, MVT::v32i8, V1,
10639 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v32i8, PSHUFBMask));
10642 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10644 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10645 DL, MVT::v32i8, V1, V2, Mask, Subtarget, DAG))
10648 // Otherwise fall back on generic lowering.
10649 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v32i8, V1, V2, Mask, DAG);
10652 /// \brief High-level routine to lower various 256-bit x86 vector shuffles.
10654 /// This routine either breaks down the specific type of a 256-bit x86 vector
10655 /// shuffle or splits it into two 128-bit shuffles and fuses the results back
10656 /// together based on the available instructions.
10657 static SDValue lower256BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10658 MVT VT, const X86Subtarget *Subtarget,
10659 SelectionDAG &DAG) {
10661 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10662 ArrayRef<int> Mask = SVOp->getMask();
10664 // If we have a single input to the zero element, insert that into V1 if we
10665 // can do so cheaply.
10666 int NumElts = VT.getVectorNumElements();
10667 int NumV2Elements = std::count_if(Mask.begin(), Mask.end(), [NumElts](int M) {
10668 return M >= NumElts;
10671 if (NumV2Elements == 1 && Mask[0] >= NumElts)
10672 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
10673 DL, VT, V1, V2, Mask, Subtarget, DAG))
10676 // There is a really nice hard cut-over between AVX1 and AVX2 that means we
10677 // can check for those subtargets here and avoid much of the subtarget
10678 // querying in the per-vector-type lowering routines. With AVX1 we have
10679 // essentially *zero* ability to manipulate a 256-bit vector with integer
10680 // types. Since we'll use floating point types there eventually, just
10681 // immediately cast everything to a float and operate entirely in that domain.
10682 if (VT.isInteger() && !Subtarget->hasAVX2()) {
10683 int ElementBits = VT.getScalarSizeInBits();
10684 if (ElementBits < 32)
10685 // No floating point type available, decompose into 128-bit vectors.
10686 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
10688 MVT FpVT = MVT::getVectorVT(MVT::getFloatingPointVT(ElementBits),
10689 VT.getVectorNumElements());
10690 V1 = DAG.getBitcast(FpVT, V1);
10691 V2 = DAG.getBitcast(FpVT, V2);
10692 return DAG.getBitcast(VT, DAG.getVectorShuffle(FpVT, DL, V1, V2, Mask));
10695 switch (VT.SimpleTy) {
10697 return lowerV4F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10699 return lowerV4I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10701 return lowerV8F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10703 return lowerV8I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10705 return lowerV16I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
10707 return lowerV32I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
10710 llvm_unreachable("Not a valid 256-bit x86 vector type!");
10714 static SDValue lowerVectorShuffleWithPERMV(SDLoc DL, MVT VT,
10715 ArrayRef<int> Mask, SDValue V1,
10716 SDValue V2, SelectionDAG &DAG) {
10718 assert(VT.getScalarSizeInBits() >= 16 && "Unexpected data type for PERMV");
10720 MVT MaskEltVT = MVT::getIntegerVT(VT.getScalarSizeInBits());
10721 MVT MaskVecVT = MVT::getVectorVT(MaskEltVT, VT.getVectorNumElements());
10723 SmallVector<SDValue, 32> VPermMask;
10724 for (unsigned i = 0; i < VT.getVectorNumElements(); ++i)
10725 VPermMask.push_back(Mask[i] < 0 ? DAG.getUNDEF(MaskEltVT) :
10726 DAG.getConstant(Mask[i], DL, MaskEltVT));
10727 SDValue MaskNode = DAG.getNode(ISD::BUILD_VECTOR, DL, MaskVecVT,
10729 if (isSingleInputShuffleMask(Mask))
10730 return DAG.getNode(X86ISD::VPERMV, DL, VT, MaskNode, V1);
10732 return DAG.getNode(X86ISD::VPERMV3, DL, VT, V1, MaskNode, V2);
10735 /// \brief Handle lowering of 8-lane 64-bit floating point shuffles.
10736 static SDValue lowerV8F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10737 const X86Subtarget *Subtarget,
10738 SelectionDAG &DAG) {
10740 assert(V1.getSimpleValueType() == MVT::v8f64 && "Bad operand type!");
10741 assert(V2.getSimpleValueType() == MVT::v8f64 && "Bad operand type!");
10742 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10743 ArrayRef<int> Mask = SVOp->getMask();
10744 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10746 if (SDValue Unpck =
10747 lowerVectorShuffleWithUNPCK(DL, MVT::v8f64, Mask, V1, V2, DAG))
10750 return lowerVectorShuffleWithPERMV(DL, MVT::v8f64, Mask, V1, V2, DAG);
10753 /// \brief Handle lowering of 16-lane 32-bit floating point shuffles.
10754 static SDValue lowerV16F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10755 const X86Subtarget *Subtarget,
10756 SelectionDAG &DAG) {
10758 assert(V1.getSimpleValueType() == MVT::v16f32 && "Bad operand type!");
10759 assert(V2.getSimpleValueType() == MVT::v16f32 && "Bad operand type!");
10760 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10761 ArrayRef<int> Mask = SVOp->getMask();
10762 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10764 if (SDValue Unpck =
10765 lowerVectorShuffleWithUNPCK(DL, MVT::v16f32, Mask, V1, V2, DAG))
10768 return lowerVectorShuffleWithPERMV(DL, MVT::v16f32, Mask, V1, V2, DAG);
10771 /// \brief Handle lowering of 8-lane 64-bit integer shuffles.
10772 static SDValue lowerV8I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10773 const X86Subtarget *Subtarget,
10774 SelectionDAG &DAG) {
10776 assert(V1.getSimpleValueType() == MVT::v8i64 && "Bad operand type!");
10777 assert(V2.getSimpleValueType() == MVT::v8i64 && "Bad operand type!");
10778 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10779 ArrayRef<int> Mask = SVOp->getMask();
10780 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10782 if (SDValue Unpck =
10783 lowerVectorShuffleWithUNPCK(DL, MVT::v8i64, Mask, V1, V2, DAG))
10786 return lowerVectorShuffleWithPERMV(DL, MVT::v8i64, Mask, V1, V2, DAG);
10789 /// \brief Handle lowering of 16-lane 32-bit integer shuffles.
10790 static SDValue lowerV16I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10791 const X86Subtarget *Subtarget,
10792 SelectionDAG &DAG) {
10794 assert(V1.getSimpleValueType() == MVT::v16i32 && "Bad operand type!");
10795 assert(V2.getSimpleValueType() == MVT::v16i32 && "Bad operand type!");
10796 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10797 ArrayRef<int> Mask = SVOp->getMask();
10798 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10800 if (SDValue Unpck =
10801 lowerVectorShuffleWithUNPCK(DL, MVT::v16i32, Mask, V1, V2, DAG))
10804 return lowerVectorShuffleWithPERMV(DL, MVT::v16i32, Mask, V1, V2, DAG);
10807 /// \brief Handle lowering of 32-lane 16-bit integer shuffles.
10808 static SDValue lowerV32I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10809 const X86Subtarget *Subtarget,
10810 SelectionDAG &DAG) {
10812 assert(V1.getSimpleValueType() == MVT::v32i16 && "Bad operand type!");
10813 assert(V2.getSimpleValueType() == MVT::v32i16 && "Bad operand type!");
10814 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10815 ArrayRef<int> Mask = SVOp->getMask();
10816 assert(Mask.size() == 32 && "Unexpected mask size for v32 shuffle!");
10817 assert(Subtarget->hasBWI() && "We can only lower v32i16 with AVX-512-BWI!");
10819 return lowerVectorShuffleWithPERMV(DL, MVT::v32i16, Mask, V1, V2, DAG);
10822 /// \brief Handle lowering of 64-lane 8-bit integer shuffles.
10823 static SDValue lowerV64I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10824 const X86Subtarget *Subtarget,
10825 SelectionDAG &DAG) {
10827 assert(V1.getSimpleValueType() == MVT::v64i8 && "Bad operand type!");
10828 assert(V2.getSimpleValueType() == MVT::v64i8 && "Bad operand type!");
10829 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10830 ArrayRef<int> Mask = SVOp->getMask();
10831 assert(Mask.size() == 64 && "Unexpected mask size for v64 shuffle!");
10832 assert(Subtarget->hasBWI() && "We can only lower v64i8 with AVX-512-BWI!");
10834 // FIXME: Implement direct support for this type!
10835 return splitAndLowerVectorShuffle(DL, MVT::v64i8, V1, V2, Mask, DAG);
10838 /// \brief High-level routine to lower various 512-bit x86 vector shuffles.
10840 /// This routine either breaks down the specific type of a 512-bit x86 vector
10841 /// shuffle or splits it into two 256-bit shuffles and fuses the results back
10842 /// together based on the available instructions.
10843 static SDValue lower512BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10844 MVT VT, const X86Subtarget *Subtarget,
10845 SelectionDAG &DAG) {
10847 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10848 ArrayRef<int> Mask = SVOp->getMask();
10849 assert(Subtarget->hasAVX512() &&
10850 "Cannot lower 512-bit vectors w/ basic ISA!");
10852 // Check for being able to broadcast a single element.
10853 if (SDValue Broadcast =
10854 lowerVectorShuffleAsBroadcast(DL, VT, V1, Mask, Subtarget, DAG))
10857 // Dispatch to each element type for lowering. If we don't have supprot for
10858 // specific element type shuffles at 512 bits, immediately split them and
10859 // lower them. Each lowering routine of a given type is allowed to assume that
10860 // the requisite ISA extensions for that element type are available.
10861 switch (VT.SimpleTy) {
10863 return lowerV8F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10865 return lowerV16F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10867 return lowerV8I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10869 return lowerV16I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10871 if (Subtarget->hasBWI())
10872 return lowerV32I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
10875 if (Subtarget->hasBWI())
10876 return lowerV64I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
10880 llvm_unreachable("Not a valid 512-bit x86 vector type!");
10883 // Otherwise fall back on splitting.
10884 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
10887 // Lower vXi1 vector shuffles.
10888 // There is no a dedicated instruction on AVX-512 that shuffles the masks.
10889 // The only way to shuffle bits is to sign-extend the mask vector to SIMD
10890 // vector, shuffle and then truncate it back.
10891 static SDValue lower1BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10892 MVT VT, const X86Subtarget *Subtarget,
10893 SelectionDAG &DAG) {
10895 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10896 ArrayRef<int> Mask = SVOp->getMask();
10897 assert(Subtarget->hasAVX512() &&
10898 "Cannot lower 512-bit vectors w/o basic ISA!");
10900 switch (VT.SimpleTy) {
10902 assert(false && "Expected a vector of i1 elements");
10905 ExtVT = MVT::v2i64;
10908 ExtVT = MVT::v4i32;
10911 ExtVT = MVT::v8i64; // Take 512-bit type, more shuffles on KNL
10914 ExtVT = MVT::v16i32;
10917 ExtVT = MVT::v32i16;
10920 ExtVT = MVT::v64i8;
10924 if (ISD::isBuildVectorAllZeros(V1.getNode()))
10925 V1 = getZeroVector(ExtVT, Subtarget, DAG, DL);
10926 else if (ISD::isBuildVectorAllOnes(V1.getNode()))
10927 V1 = getOnesVector(ExtVT, Subtarget, DAG, DL);
10929 V1 = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, V1);
10932 V2 = DAG.getUNDEF(ExtVT);
10933 else if (ISD::isBuildVectorAllZeros(V2.getNode()))
10934 V2 = getZeroVector(ExtVT, Subtarget, DAG, DL);
10935 else if (ISD::isBuildVectorAllOnes(V2.getNode()))
10936 V2 = getOnesVector(ExtVT, Subtarget, DAG, DL);
10938 V2 = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, V2);
10939 return DAG.getNode(ISD::TRUNCATE, DL, VT,
10940 DAG.getVectorShuffle(ExtVT, DL, V1, V2, Mask));
10942 /// \brief Top-level lowering for x86 vector shuffles.
10944 /// This handles decomposition, canonicalization, and lowering of all x86
10945 /// vector shuffles. Most of the specific lowering strategies are encapsulated
10946 /// above in helper routines. The canonicalization attempts to widen shuffles
10947 /// to involve fewer lanes of wider elements, consolidate symmetric patterns
10948 /// s.t. only one of the two inputs needs to be tested, etc.
10949 static SDValue lowerVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
10950 SelectionDAG &DAG) {
10951 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10952 ArrayRef<int> Mask = SVOp->getMask();
10953 SDValue V1 = Op.getOperand(0);
10954 SDValue V2 = Op.getOperand(1);
10955 MVT VT = Op.getSimpleValueType();
10956 int NumElements = VT.getVectorNumElements();
10958 bool Is1BitVector = (VT.getScalarType() == MVT::i1);
10960 assert((VT.getSizeInBits() != 64 || Is1BitVector) &&
10961 "Can't lower MMX shuffles");
10963 bool V1IsUndef = V1.getOpcode() == ISD::UNDEF;
10964 bool V2IsUndef = V2.getOpcode() == ISD::UNDEF;
10965 if (V1IsUndef && V2IsUndef)
10966 return DAG.getUNDEF(VT);
10968 // When we create a shuffle node we put the UNDEF node to second operand,
10969 // but in some cases the first operand may be transformed to UNDEF.
10970 // In this case we should just commute the node.
10972 return DAG.getCommutedVectorShuffle(*SVOp);
10974 // Check for non-undef masks pointing at an undef vector and make the masks
10975 // undef as well. This makes it easier to match the shuffle based solely on
10979 if (M >= NumElements) {
10980 SmallVector<int, 8> NewMask(Mask.begin(), Mask.end());
10981 for (int &M : NewMask)
10982 if (M >= NumElements)
10984 return DAG.getVectorShuffle(VT, dl, V1, V2, NewMask);
10987 // We actually see shuffles that are entirely re-arrangements of a set of
10988 // zero inputs. This mostly happens while decomposing complex shuffles into
10989 // simple ones. Directly lower these as a buildvector of zeros.
10990 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
10991 if (Zeroable.all())
10992 return getZeroVector(VT, Subtarget, DAG, dl);
10994 // Try to collapse shuffles into using a vector type with fewer elements but
10995 // wider element types. We cap this to not form integers or floating point
10996 // elements wider than 64 bits, but it might be interesting to form i128
10997 // integers to handle flipping the low and high halves of AVX 256-bit vectors.
10998 SmallVector<int, 16> WidenedMask;
10999 if (VT.getScalarSizeInBits() < 64 && !Is1BitVector &&
11000 canWidenShuffleElements(Mask, WidenedMask)) {
11001 MVT NewEltVT = VT.isFloatingPoint()
11002 ? MVT::getFloatingPointVT(VT.getScalarSizeInBits() * 2)
11003 : MVT::getIntegerVT(VT.getScalarSizeInBits() * 2);
11004 MVT NewVT = MVT::getVectorVT(NewEltVT, VT.getVectorNumElements() / 2);
11005 // Make sure that the new vector type is legal. For example, v2f64 isn't
11007 if (DAG.getTargetLoweringInfo().isTypeLegal(NewVT)) {
11008 V1 = DAG.getBitcast(NewVT, V1);
11009 V2 = DAG.getBitcast(NewVT, V2);
11010 return DAG.getBitcast(
11011 VT, DAG.getVectorShuffle(NewVT, dl, V1, V2, WidenedMask));
11015 int NumV1Elements = 0, NumUndefElements = 0, NumV2Elements = 0;
11016 for (int M : SVOp->getMask())
11018 ++NumUndefElements;
11019 else if (M < NumElements)
11024 // Commute the shuffle as needed such that more elements come from V1 than
11025 // V2. This allows us to match the shuffle pattern strictly on how many
11026 // elements come from V1 without handling the symmetric cases.
11027 if (NumV2Elements > NumV1Elements)
11028 return DAG.getCommutedVectorShuffle(*SVOp);
11030 // When the number of V1 and V2 elements are the same, try to minimize the
11031 // number of uses of V2 in the low half of the vector. When that is tied,
11032 // ensure that the sum of indices for V1 is equal to or lower than the sum
11033 // indices for V2. When those are equal, try to ensure that the number of odd
11034 // indices for V1 is lower than the number of odd indices for V2.
11035 if (NumV1Elements == NumV2Elements) {
11036 int LowV1Elements = 0, LowV2Elements = 0;
11037 for (int M : SVOp->getMask().slice(0, NumElements / 2))
11038 if (M >= NumElements)
11042 if (LowV2Elements > LowV1Elements) {
11043 return DAG.getCommutedVectorShuffle(*SVOp);
11044 } else if (LowV2Elements == LowV1Elements) {
11045 int SumV1Indices = 0, SumV2Indices = 0;
11046 for (int i = 0, Size = SVOp->getMask().size(); i < Size; ++i)
11047 if (SVOp->getMask()[i] >= NumElements)
11049 else if (SVOp->getMask()[i] >= 0)
11051 if (SumV2Indices < SumV1Indices) {
11052 return DAG.getCommutedVectorShuffle(*SVOp);
11053 } else if (SumV2Indices == SumV1Indices) {
11054 int NumV1OddIndices = 0, NumV2OddIndices = 0;
11055 for (int i = 0, Size = SVOp->getMask().size(); i < Size; ++i)
11056 if (SVOp->getMask()[i] >= NumElements)
11057 NumV2OddIndices += i % 2;
11058 else if (SVOp->getMask()[i] >= 0)
11059 NumV1OddIndices += i % 2;
11060 if (NumV2OddIndices < NumV1OddIndices)
11061 return DAG.getCommutedVectorShuffle(*SVOp);
11066 // For each vector width, delegate to a specialized lowering routine.
11067 if (VT.getSizeInBits() == 128)
11068 return lower128BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11070 if (VT.getSizeInBits() == 256)
11071 return lower256BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11073 if (VT.getSizeInBits() == 512)
11074 return lower512BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11077 return lower1BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11078 llvm_unreachable("Unimplemented!");
11081 // This function assumes its argument is a BUILD_VECTOR of constants or
11082 // undef SDNodes. i.e: ISD::isBuildVectorOfConstantSDNodes(BuildVector) is
11084 static bool BUILD_VECTORtoBlendMask(BuildVectorSDNode *BuildVector,
11085 unsigned &MaskValue) {
11087 unsigned NumElems = BuildVector->getNumOperands();
11088 // There are 2 lanes if (NumElems > 8), and 1 lane otherwise.
11089 unsigned NumLanes = (NumElems - 1) / 8 + 1;
11090 unsigned NumElemsInLane = NumElems / NumLanes;
11092 // Blend for v16i16 should be symmetric for the both lanes.
11093 for (unsigned i = 0; i < NumElemsInLane; ++i) {
11094 SDValue EltCond = BuildVector->getOperand(i);
11095 SDValue SndLaneEltCond =
11096 (NumLanes == 2) ? BuildVector->getOperand(i + NumElemsInLane) : EltCond;
11098 int Lane1Cond = -1, Lane2Cond = -1;
11099 if (isa<ConstantSDNode>(EltCond))
11100 Lane1Cond = !isZero(EltCond);
11101 if (isa<ConstantSDNode>(SndLaneEltCond))
11102 Lane2Cond = !isZero(SndLaneEltCond);
11104 if (Lane1Cond == Lane2Cond || Lane2Cond < 0)
11105 // Lane1Cond != 0, means we want the first argument.
11106 // Lane1Cond == 0, means we want the second argument.
11107 // The encoding of this argument is 0 for the first argument, 1
11108 // for the second. Therefore, invert the condition.
11109 MaskValue |= !Lane1Cond << i;
11110 else if (Lane1Cond < 0)
11111 MaskValue |= !Lane2Cond << i;
11118 /// \brief Try to lower a VSELECT instruction to a vector shuffle.
11119 static SDValue lowerVSELECTtoVectorShuffle(SDValue Op,
11120 const X86Subtarget *Subtarget,
11121 SelectionDAG &DAG) {
11122 SDValue Cond = Op.getOperand(0);
11123 SDValue LHS = Op.getOperand(1);
11124 SDValue RHS = Op.getOperand(2);
11126 MVT VT = Op.getSimpleValueType();
11128 if (!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode()))
11130 auto *CondBV = cast<BuildVectorSDNode>(Cond);
11132 // Only non-legal VSELECTs reach this lowering, convert those into generic
11133 // shuffles and re-use the shuffle lowering path for blends.
11134 SmallVector<int, 32> Mask;
11135 for (int i = 0, Size = VT.getVectorNumElements(); i < Size; ++i) {
11136 SDValue CondElt = CondBV->getOperand(i);
11138 isa<ConstantSDNode>(CondElt) ? i + (isZero(CondElt) ? Size : 0) : -1);
11140 return DAG.getVectorShuffle(VT, dl, LHS, RHS, Mask);
11143 SDValue X86TargetLowering::LowerVSELECT(SDValue Op, SelectionDAG &DAG) const {
11144 // A vselect where all conditions and data are constants can be optimized into
11145 // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR().
11146 if (ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(0).getNode()) &&
11147 ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(1).getNode()) &&
11148 ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(2).getNode()))
11151 // Try to lower this to a blend-style vector shuffle. This can handle all
11152 // constant condition cases.
11153 if (SDValue BlendOp = lowerVSELECTtoVectorShuffle(Op, Subtarget, DAG))
11156 // Variable blends are only legal from SSE4.1 onward.
11157 if (!Subtarget->hasSSE41())
11160 // Only some types will be legal on some subtargets. If we can emit a legal
11161 // VSELECT-matching blend, return Op, and but if we need to expand, return
11163 switch (Op.getSimpleValueType().SimpleTy) {
11165 // Most of the vector types have blends past SSE4.1.
11169 // The byte blends for AVX vectors were introduced only in AVX2.
11170 if (Subtarget->hasAVX2())
11177 // AVX-512 BWI and VLX features support VSELECT with i16 elements.
11178 if (Subtarget->hasBWI() && Subtarget->hasVLX())
11181 // FIXME: We should custom lower this by fixing the condition and using i8
11187 static SDValue LowerEXTRACT_VECTOR_ELT_SSE4(SDValue Op, SelectionDAG &DAG) {
11188 MVT VT = Op.getSimpleValueType();
11191 if (!Op.getOperand(0).getSimpleValueType().is128BitVector())
11194 if (VT.getSizeInBits() == 8) {
11195 SDValue Extract = DAG.getNode(X86ISD::PEXTRB, dl, MVT::i32,
11196 Op.getOperand(0), Op.getOperand(1));
11197 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
11198 DAG.getValueType(VT));
11199 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11202 if (VT.getSizeInBits() == 16) {
11203 unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
11204 // If Idx is 0, it's cheaper to do a move instead of a pextrw.
11206 return DAG.getNode(
11207 ISD::TRUNCATE, dl, MVT::i16,
11208 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11209 DAG.getBitcast(MVT::v4i32, Op.getOperand(0)),
11210 Op.getOperand(1)));
11211 SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, MVT::i32,
11212 Op.getOperand(0), Op.getOperand(1));
11213 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
11214 DAG.getValueType(VT));
11215 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11218 if (VT == MVT::f32) {
11219 // EXTRACTPS outputs to a GPR32 register which will require a movd to copy
11220 // the result back to FR32 register. It's only worth matching if the
11221 // result has a single use which is a store or a bitcast to i32. And in
11222 // the case of a store, it's not worth it if the index is a constant 0,
11223 // because a MOVSSmr can be used instead, which is smaller and faster.
11224 if (!Op.hasOneUse())
11226 SDNode *User = *Op.getNode()->use_begin();
11227 if ((User->getOpcode() != ISD::STORE ||
11228 (isa<ConstantSDNode>(Op.getOperand(1)) &&
11229 cast<ConstantSDNode>(Op.getOperand(1))->isNullValue())) &&
11230 (User->getOpcode() != ISD::BITCAST ||
11231 User->getValueType(0) != MVT::i32))
11233 SDValue Extract = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11234 DAG.getBitcast(MVT::v4i32, Op.getOperand(0)),
11236 return DAG.getBitcast(MVT::f32, Extract);
11239 if (VT == MVT::i32 || VT == MVT::i64) {
11240 // ExtractPS/pextrq works with constant index.
11241 if (isa<ConstantSDNode>(Op.getOperand(1)))
11247 /// Extract one bit from mask vector, like v16i1 or v8i1.
11248 /// AVX-512 feature.
11250 X86TargetLowering::ExtractBitFromMaskVector(SDValue Op, SelectionDAG &DAG) const {
11251 SDValue Vec = Op.getOperand(0);
11253 MVT VecVT = Vec.getSimpleValueType();
11254 SDValue Idx = Op.getOperand(1);
11255 MVT EltVT = Op.getSimpleValueType();
11257 assert((EltVT == MVT::i1) && "Unexpected operands in ExtractBitFromMaskVector");
11258 assert((VecVT.getVectorNumElements() <= 16 || Subtarget->hasBWI()) &&
11259 "Unexpected vector type in ExtractBitFromMaskVector");
11261 // variable index can't be handled in mask registers,
11262 // extend vector to VR512
11263 if (!isa<ConstantSDNode>(Idx)) {
11264 MVT ExtVT = (VecVT == MVT::v8i1 ? MVT::v8i64 : MVT::v16i32);
11265 SDValue Ext = DAG.getNode(ISD::ZERO_EXTEND, dl, ExtVT, Vec);
11266 SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
11267 ExtVT.getVectorElementType(), Ext, Idx);
11268 return DAG.getNode(ISD::TRUNCATE, dl, EltVT, Elt);
11271 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11272 const TargetRegisterClass* rc = getRegClassFor(VecVT);
11273 if (!Subtarget->hasDQI() && (VecVT.getVectorNumElements() <= 8))
11274 rc = getRegClassFor(MVT::v16i1);
11275 unsigned MaxSift = rc->getSize()*8 - 1;
11276 Vec = DAG.getNode(X86ISD::VSHLI, dl, VecVT, Vec,
11277 DAG.getConstant(MaxSift - IdxVal, dl, MVT::i8));
11278 Vec = DAG.getNode(X86ISD::VSRLI, dl, VecVT, Vec,
11279 DAG.getConstant(MaxSift, dl, MVT::i8));
11280 return DAG.getNode(X86ISD::VEXTRACT, dl, MVT::i1, Vec,
11281 DAG.getIntPtrConstant(0, dl));
11285 X86TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
11286 SelectionDAG &DAG) const {
11288 SDValue Vec = Op.getOperand(0);
11289 MVT VecVT = Vec.getSimpleValueType();
11290 SDValue Idx = Op.getOperand(1);
11292 if (Op.getSimpleValueType() == MVT::i1)
11293 return ExtractBitFromMaskVector(Op, DAG);
11295 if (!isa<ConstantSDNode>(Idx)) {
11296 if (VecVT.is512BitVector() ||
11297 (VecVT.is256BitVector() && Subtarget->hasInt256() &&
11298 VecVT.getVectorElementType().getSizeInBits() == 32)) {
11301 MVT::getIntegerVT(VecVT.getVectorElementType().getSizeInBits());
11302 MVT MaskVT = MVT::getVectorVT(MaskEltVT, VecVT.getSizeInBits() /
11303 MaskEltVT.getSizeInBits());
11305 Idx = DAG.getZExtOrTrunc(Idx, dl, MaskEltVT);
11306 auto PtrVT = getPointerTy(DAG.getDataLayout());
11307 SDValue Mask = DAG.getNode(X86ISD::VINSERT, dl, MaskVT,
11308 getZeroVector(MaskVT, Subtarget, DAG, dl), Idx,
11309 DAG.getConstant(0, dl, PtrVT));
11310 SDValue Perm = DAG.getNode(X86ISD::VPERMV, dl, VecVT, Mask, Vec);
11311 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, Op.getValueType(), Perm,
11312 DAG.getConstant(0, dl, PtrVT));
11317 // If this is a 256-bit vector result, first extract the 128-bit vector and
11318 // then extract the element from the 128-bit vector.
11319 if (VecVT.is256BitVector() || VecVT.is512BitVector()) {
11321 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11322 // Get the 128-bit vector.
11323 Vec = Extract128BitVector(Vec, IdxVal, DAG, dl);
11324 MVT EltVT = VecVT.getVectorElementType();
11326 unsigned ElemsPerChunk = 128 / EltVT.getSizeInBits();
11328 //if (IdxVal >= NumElems/2)
11329 // IdxVal -= NumElems/2;
11330 IdxVal -= (IdxVal/ElemsPerChunk)*ElemsPerChunk;
11331 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, Op.getValueType(), Vec,
11332 DAG.getConstant(IdxVal, dl, MVT::i32));
11335 assert(VecVT.is128BitVector() && "Unexpected vector length");
11337 if (Subtarget->hasSSE41())
11338 if (SDValue Res = LowerEXTRACT_VECTOR_ELT_SSE4(Op, DAG))
11341 MVT VT = Op.getSimpleValueType();
11342 // TODO: handle v16i8.
11343 if (VT.getSizeInBits() == 16) {
11344 SDValue Vec = Op.getOperand(0);
11345 unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
11347 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i16,
11348 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11349 DAG.getBitcast(MVT::v4i32, Vec),
11350 Op.getOperand(1)));
11351 // Transform it so it match pextrw which produces a 32-bit result.
11352 MVT EltVT = MVT::i32;
11353 SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, EltVT,
11354 Op.getOperand(0), Op.getOperand(1));
11355 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, EltVT, Extract,
11356 DAG.getValueType(VT));
11357 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11360 if (VT.getSizeInBits() == 32) {
11361 unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
11365 // SHUFPS the element to the lowest double word, then movss.
11366 int Mask[4] = { static_cast<int>(Idx), -1, -1, -1 };
11367 MVT VVT = Op.getOperand(0).getSimpleValueType();
11368 SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
11369 DAG.getUNDEF(VVT), Mask);
11370 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
11371 DAG.getIntPtrConstant(0, dl));
11374 if (VT.getSizeInBits() == 64) {
11375 // FIXME: .td only matches this for <2 x f64>, not <2 x i64> on 32b
11376 // FIXME: seems like this should be unnecessary if mov{h,l}pd were taught
11377 // to match extract_elt for f64.
11378 unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
11382 // UNPCKHPD the element to the lowest double word, then movsd.
11383 // Note if the lower 64 bits of the result of the UNPCKHPD is then stored
11384 // to a f64mem, the whole operation is folded into a single MOVHPDmr.
11385 int Mask[2] = { 1, -1 };
11386 MVT VVT = Op.getOperand(0).getSimpleValueType();
11387 SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
11388 DAG.getUNDEF(VVT), Mask);
11389 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
11390 DAG.getIntPtrConstant(0, dl));
11396 /// Insert one bit to mask vector, like v16i1 or v8i1.
11397 /// AVX-512 feature.
11399 X86TargetLowering::InsertBitToMaskVector(SDValue Op, SelectionDAG &DAG) const {
11401 SDValue Vec = Op.getOperand(0);
11402 SDValue Elt = Op.getOperand(1);
11403 SDValue Idx = Op.getOperand(2);
11404 MVT VecVT = Vec.getSimpleValueType();
11406 if (!isa<ConstantSDNode>(Idx)) {
11407 // Non constant index. Extend source and destination,
11408 // insert element and then truncate the result.
11409 MVT ExtVecVT = (VecVT == MVT::v8i1 ? MVT::v8i64 : MVT::v16i32);
11410 MVT ExtEltVT = (VecVT == MVT::v8i1 ? MVT::i64 : MVT::i32);
11411 SDValue ExtOp = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, ExtVecVT,
11412 DAG.getNode(ISD::ZERO_EXTEND, dl, ExtVecVT, Vec),
11413 DAG.getNode(ISD::ZERO_EXTEND, dl, ExtEltVT, Elt), Idx);
11414 return DAG.getNode(ISD::TRUNCATE, dl, VecVT, ExtOp);
11417 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11418 SDValue EltInVec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VecVT, Elt);
11420 EltInVec = DAG.getNode(X86ISD::VSHLI, dl, VecVT, EltInVec,
11421 DAG.getConstant(IdxVal, dl, MVT::i8));
11422 if (Vec.getOpcode() == ISD::UNDEF)
11424 return DAG.getNode(ISD::OR, dl, VecVT, Vec, EltInVec);
11427 SDValue X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
11428 SelectionDAG &DAG) const {
11429 MVT VT = Op.getSimpleValueType();
11430 MVT EltVT = VT.getVectorElementType();
11432 if (EltVT == MVT::i1)
11433 return InsertBitToMaskVector(Op, DAG);
11436 SDValue N0 = Op.getOperand(0);
11437 SDValue N1 = Op.getOperand(1);
11438 SDValue N2 = Op.getOperand(2);
11439 if (!isa<ConstantSDNode>(N2))
11441 auto *N2C = cast<ConstantSDNode>(N2);
11442 unsigned IdxVal = N2C->getZExtValue();
11444 // If the vector is wider than 128 bits, extract the 128-bit subvector, insert
11445 // into that, and then insert the subvector back into the result.
11446 if (VT.is256BitVector() || VT.is512BitVector()) {
11447 // With a 256-bit vector, we can insert into the zero element efficiently
11448 // using a blend if we have AVX or AVX2 and the right data type.
11449 if (VT.is256BitVector() && IdxVal == 0) {
11450 // TODO: It is worthwhile to cast integer to floating point and back
11451 // and incur a domain crossing penalty if that's what we'll end up
11452 // doing anyway after extracting to a 128-bit vector.
11453 if ((Subtarget->hasAVX() && (EltVT == MVT::f64 || EltVT == MVT::f32)) ||
11454 (Subtarget->hasAVX2() && EltVT == MVT::i32)) {
11455 SDValue N1Vec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, N1);
11456 N2 = DAG.getIntPtrConstant(1, dl);
11457 return DAG.getNode(X86ISD::BLENDI, dl, VT, N0, N1Vec, N2);
11461 // Get the desired 128-bit vector chunk.
11462 SDValue V = Extract128BitVector(N0, IdxVal, DAG, dl);
11464 // Insert the element into the desired chunk.
11465 unsigned NumEltsIn128 = 128 / EltVT.getSizeInBits();
11466 unsigned IdxIn128 = IdxVal - (IdxVal / NumEltsIn128) * NumEltsIn128;
11468 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, V.getValueType(), V, N1,
11469 DAG.getConstant(IdxIn128, dl, MVT::i32));
11471 // Insert the changed part back into the bigger vector
11472 return Insert128BitVector(N0, V, IdxVal, DAG, dl);
11474 assert(VT.is128BitVector() && "Only 128-bit vector types should be left!");
11476 if (Subtarget->hasSSE41()) {
11477 if (EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) {
11479 if (VT == MVT::v8i16) {
11480 Opc = X86ISD::PINSRW;
11482 assert(VT == MVT::v16i8);
11483 Opc = X86ISD::PINSRB;
11486 // Transform it so it match pinsr{b,w} which expects a GR32 as its second
11488 if (N1.getValueType() != MVT::i32)
11489 N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
11490 if (N2.getValueType() != MVT::i32)
11491 N2 = DAG.getIntPtrConstant(IdxVal, dl);
11492 return DAG.getNode(Opc, dl, VT, N0, N1, N2);
11495 if (EltVT == MVT::f32) {
11496 // Bits [7:6] of the constant are the source select. This will always be
11497 // zero here. The DAG Combiner may combine an extract_elt index into
11498 // these bits. For example (insert (extract, 3), 2) could be matched by
11499 // putting the '3' into bits [7:6] of X86ISD::INSERTPS.
11500 // Bits [5:4] of the constant are the destination select. This is the
11501 // value of the incoming immediate.
11502 // Bits [3:0] of the constant are the zero mask. The DAG Combiner may
11503 // combine either bitwise AND or insert of float 0.0 to set these bits.
11505 bool MinSize = DAG.getMachineFunction().getFunction()->optForMinSize();
11506 if (IdxVal == 0 && (!MinSize || !MayFoldLoad(N1))) {
11507 // If this is an insertion of 32-bits into the low 32-bits of
11508 // a vector, we prefer to generate a blend with immediate rather
11509 // than an insertps. Blends are simpler operations in hardware and so
11510 // will always have equal or better performance than insertps.
11511 // But if optimizing for size and there's a load folding opportunity,
11512 // generate insertps because blendps does not have a 32-bit memory
11514 N2 = DAG.getIntPtrConstant(1, dl);
11515 N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
11516 return DAG.getNode(X86ISD::BLENDI, dl, VT, N0, N1, N2);
11518 N2 = DAG.getIntPtrConstant(IdxVal << 4, dl);
11519 // Create this as a scalar to vector..
11520 N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
11521 return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
11524 if (EltVT == MVT::i32 || EltVT == MVT::i64) {
11525 // PINSR* works with constant index.
11530 if (EltVT == MVT::i8)
11533 if (EltVT.getSizeInBits() == 16) {
11534 // Transform it so it match pinsrw which expects a 16-bit value in a GR32
11535 // as its second argument.
11536 if (N1.getValueType() != MVT::i32)
11537 N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
11538 if (N2.getValueType() != MVT::i32)
11539 N2 = DAG.getIntPtrConstant(IdxVal, dl);
11540 return DAG.getNode(X86ISD::PINSRW, dl, VT, N0, N1, N2);
11545 static SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) {
11547 MVT OpVT = Op.getSimpleValueType();
11549 // If this is a 256-bit vector result, first insert into a 128-bit
11550 // vector and then insert into the 256-bit vector.
11551 if (!OpVT.is128BitVector()) {
11552 // Insert into a 128-bit vector.
11553 unsigned SizeFactor = OpVT.getSizeInBits()/128;
11554 MVT VT128 = MVT::getVectorVT(OpVT.getVectorElementType(),
11555 OpVT.getVectorNumElements() / SizeFactor);
11557 Op = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT128, Op.getOperand(0));
11559 // Insert the 128-bit vector.
11560 return Insert128BitVector(DAG.getUNDEF(OpVT), Op, 0, DAG, dl);
11563 if (OpVT == MVT::v1i64 &&
11564 Op.getOperand(0).getValueType() == MVT::i64)
11565 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v1i64, Op.getOperand(0));
11567 SDValue AnyExt = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, Op.getOperand(0));
11568 assert(OpVT.is128BitVector() && "Expected an SSE type!");
11569 return DAG.getBitcast(
11570 OpVT, DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, AnyExt));
11573 // Lower a node with an EXTRACT_SUBVECTOR opcode. This may result in
11574 // a simple subregister reference or explicit instructions to grab
11575 // upper bits of a vector.
11576 static SDValue LowerEXTRACT_SUBVECTOR(SDValue Op, const X86Subtarget *Subtarget,
11577 SelectionDAG &DAG) {
11579 SDValue In = Op.getOperand(0);
11580 SDValue Idx = Op.getOperand(1);
11581 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11582 MVT ResVT = Op.getSimpleValueType();
11583 MVT InVT = In.getSimpleValueType();
11585 if (Subtarget->hasFp256()) {
11586 if (ResVT.is128BitVector() &&
11587 (InVT.is256BitVector() || InVT.is512BitVector()) &&
11588 isa<ConstantSDNode>(Idx)) {
11589 return Extract128BitVector(In, IdxVal, DAG, dl);
11591 if (ResVT.is256BitVector() && InVT.is512BitVector() &&
11592 isa<ConstantSDNode>(Idx)) {
11593 return Extract256BitVector(In, IdxVal, DAG, dl);
11599 // Lower a node with an INSERT_SUBVECTOR opcode. This may result in a
11600 // simple superregister reference or explicit instructions to insert
11601 // the upper bits of a vector.
11602 static SDValue LowerINSERT_SUBVECTOR(SDValue Op, const X86Subtarget *Subtarget,
11603 SelectionDAG &DAG) {
11604 if (!Subtarget->hasAVX())
11608 SDValue Vec = Op.getOperand(0);
11609 SDValue SubVec = Op.getOperand(1);
11610 SDValue Idx = Op.getOperand(2);
11612 if (!isa<ConstantSDNode>(Idx))
11615 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11616 MVT OpVT = Op.getSimpleValueType();
11617 MVT SubVecVT = SubVec.getSimpleValueType();
11619 // Fold two 16-byte subvector loads into one 32-byte load:
11620 // (insert_subvector (insert_subvector undef, (load addr), 0),
11621 // (load addr + 16), Elts/2)
11623 if ((IdxVal == OpVT.getVectorNumElements() / 2) &&
11624 Vec.getOpcode() == ISD::INSERT_SUBVECTOR &&
11625 OpVT.is256BitVector() && SubVecVT.is128BitVector()) {
11626 auto *Idx2 = dyn_cast<ConstantSDNode>(Vec.getOperand(2));
11627 if (Idx2 && Idx2->getZExtValue() == 0) {
11628 SDValue SubVec2 = Vec.getOperand(1);
11629 // If needed, look through a bitcast to get to the load.
11630 if (SubVec2.getNode() && SubVec2.getOpcode() == ISD::BITCAST)
11631 SubVec2 = SubVec2.getOperand(0);
11633 if (auto *FirstLd = dyn_cast<LoadSDNode>(SubVec2)) {
11635 unsigned Alignment = FirstLd->getAlignment();
11636 unsigned AS = FirstLd->getAddressSpace();
11637 const X86TargetLowering *TLI = Subtarget->getTargetLowering();
11638 if (TLI->allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(),
11639 OpVT, AS, Alignment, &Fast) && Fast) {
11640 SDValue Ops[] = { SubVec2, SubVec };
11641 if (SDValue Ld = EltsFromConsecutiveLoads(OpVT, Ops, dl, DAG, false))
11648 if ((OpVT.is256BitVector() || OpVT.is512BitVector()) &&
11649 SubVecVT.is128BitVector())
11650 return Insert128BitVector(Vec, SubVec, IdxVal, DAG, dl);
11652 if (OpVT.is512BitVector() && SubVecVT.is256BitVector())
11653 return Insert256BitVector(Vec, SubVec, IdxVal, DAG, dl);
11655 if (OpVT.getVectorElementType() == MVT::i1) {
11656 if (IdxVal == 0 && Vec.getOpcode() == ISD::UNDEF) // the operation is legal
11658 SDValue ZeroIdx = DAG.getIntPtrConstant(0, dl);
11659 SDValue Undef = DAG.getUNDEF(OpVT);
11660 unsigned NumElems = OpVT.getVectorNumElements();
11661 SDValue ShiftBits = DAG.getConstant(NumElems/2, dl, MVT::i8);
11663 if (IdxVal == OpVT.getVectorNumElements() / 2) {
11664 // Zero upper bits of the Vec
11665 Vec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec, ShiftBits);
11666 Vec = DAG.getNode(X86ISD::VSRLI, dl, OpVT, Vec, ShiftBits);
11668 SDValue Vec2 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, OpVT, Undef,
11670 Vec2 = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec2, ShiftBits);
11671 return DAG.getNode(ISD::OR, dl, OpVT, Vec, Vec2);
11674 SDValue Vec2 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, OpVT, Undef,
11676 // Zero upper bits of the Vec2
11677 Vec2 = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec2, ShiftBits);
11678 Vec2 = DAG.getNode(X86ISD::VSRLI, dl, OpVT, Vec2, ShiftBits);
11679 // Zero lower bits of the Vec
11680 Vec = DAG.getNode(X86ISD::VSRLI, dl, OpVT, Vec, ShiftBits);
11681 Vec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec, ShiftBits);
11682 // Merge them together
11683 return DAG.getNode(ISD::OR, dl, OpVT, Vec, Vec2);
11689 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
11690 // their target countpart wrapped in the X86ISD::Wrapper node. Suppose N is
11691 // one of the above mentioned nodes. It has to be wrapped because otherwise
11692 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
11693 // be used to form addressing mode. These wrapped nodes will be selected
11696 X86TargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const {
11697 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
11699 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11700 // global base reg.
11701 unsigned char OpFlag = 0;
11702 unsigned WrapperKind = X86ISD::Wrapper;
11703 CodeModel::Model M = DAG.getTarget().getCodeModel();
11705 if (Subtarget->isPICStyleRIPRel() &&
11706 (M == CodeModel::Small || M == CodeModel::Kernel))
11707 WrapperKind = X86ISD::WrapperRIP;
11708 else if (Subtarget->isPICStyleGOT())
11709 OpFlag = X86II::MO_GOTOFF;
11710 else if (Subtarget->isPICStyleStubPIC())
11711 OpFlag = X86II::MO_PIC_BASE_OFFSET;
11713 auto PtrVT = getPointerTy(DAG.getDataLayout());
11714 SDValue Result = DAG.getTargetConstantPool(
11715 CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(), OpFlag);
11717 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11718 // With PIC, the address is actually $g + Offset.
11721 DAG.getNode(ISD::ADD, DL, PtrVT,
11722 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11728 SDValue X86TargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
11729 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
11731 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11732 // global base reg.
11733 unsigned char OpFlag = 0;
11734 unsigned WrapperKind = X86ISD::Wrapper;
11735 CodeModel::Model M = DAG.getTarget().getCodeModel();
11737 if (Subtarget->isPICStyleRIPRel() &&
11738 (M == CodeModel::Small || M == CodeModel::Kernel))
11739 WrapperKind = X86ISD::WrapperRIP;
11740 else if (Subtarget->isPICStyleGOT())
11741 OpFlag = X86II::MO_GOTOFF;
11742 else if (Subtarget->isPICStyleStubPIC())
11743 OpFlag = X86II::MO_PIC_BASE_OFFSET;
11745 auto PtrVT = getPointerTy(DAG.getDataLayout());
11746 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, OpFlag);
11748 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11750 // With PIC, the address is actually $g + Offset.
11753 DAG.getNode(ISD::ADD, DL, PtrVT,
11754 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11760 X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const {
11761 const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
11763 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11764 // global base reg.
11765 unsigned char OpFlag = 0;
11766 unsigned WrapperKind = X86ISD::Wrapper;
11767 CodeModel::Model M = DAG.getTarget().getCodeModel();
11769 if (Subtarget->isPICStyleRIPRel() &&
11770 (M == CodeModel::Small || M == CodeModel::Kernel)) {
11771 if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF())
11772 OpFlag = X86II::MO_GOTPCREL;
11773 WrapperKind = X86ISD::WrapperRIP;
11774 } else if (Subtarget->isPICStyleGOT()) {
11775 OpFlag = X86II::MO_GOT;
11776 } else if (Subtarget->isPICStyleStubPIC()) {
11777 OpFlag = X86II::MO_DARWIN_NONLAZY_PIC_BASE;
11778 } else if (Subtarget->isPICStyleStubNoDynamic()) {
11779 OpFlag = X86II::MO_DARWIN_NONLAZY;
11782 auto PtrVT = getPointerTy(DAG.getDataLayout());
11783 SDValue Result = DAG.getTargetExternalSymbol(Sym, PtrVT, OpFlag);
11786 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11788 // With PIC, the address is actually $g + Offset.
11789 if (DAG.getTarget().getRelocationModel() == Reloc::PIC_ &&
11790 !Subtarget->is64Bit()) {
11792 DAG.getNode(ISD::ADD, DL, PtrVT,
11793 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11796 // For symbols that require a load from a stub to get the address, emit the
11798 if (isGlobalStubReference(OpFlag))
11799 Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), Result,
11800 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
11801 false, false, false, 0);
11807 X86TargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
11808 // Create the TargetBlockAddressAddress node.
11809 unsigned char OpFlags =
11810 Subtarget->ClassifyBlockAddressReference();
11811 CodeModel::Model M = DAG.getTarget().getCodeModel();
11812 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
11813 int64_t Offset = cast<BlockAddressSDNode>(Op)->getOffset();
11815 auto PtrVT = getPointerTy(DAG.getDataLayout());
11816 SDValue Result = DAG.getTargetBlockAddress(BA, PtrVT, Offset, OpFlags);
11818 if (Subtarget->isPICStyleRIPRel() &&
11819 (M == CodeModel::Small || M == CodeModel::Kernel))
11820 Result = DAG.getNode(X86ISD::WrapperRIP, dl, PtrVT, Result);
11822 Result = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, Result);
11824 // With PIC, the address is actually $g + Offset.
11825 if (isGlobalRelativeToPICBase(OpFlags)) {
11826 Result = DAG.getNode(ISD::ADD, dl, PtrVT,
11827 DAG.getNode(X86ISD::GlobalBaseReg, dl, PtrVT), Result);
11834 X86TargetLowering::LowerGlobalAddress(const GlobalValue *GV, SDLoc dl,
11835 int64_t Offset, SelectionDAG &DAG) const {
11836 // Create the TargetGlobalAddress node, folding in the constant
11837 // offset if it is legal.
11838 unsigned char OpFlags =
11839 Subtarget->ClassifyGlobalReference(GV, DAG.getTarget());
11840 CodeModel::Model M = DAG.getTarget().getCodeModel();
11841 auto PtrVT = getPointerTy(DAG.getDataLayout());
11843 if (OpFlags == X86II::MO_NO_FLAG &&
11844 X86::isOffsetSuitableForCodeModel(Offset, M)) {
11845 // A direct static reference to a global.
11846 Result = DAG.getTargetGlobalAddress(GV, dl, PtrVT, Offset);
11849 Result = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, OpFlags);
11852 if (Subtarget->isPICStyleRIPRel() &&
11853 (M == CodeModel::Small || M == CodeModel::Kernel))
11854 Result = DAG.getNode(X86ISD::WrapperRIP, dl, PtrVT, Result);
11856 Result = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, Result);
11858 // With PIC, the address is actually $g + Offset.
11859 if (isGlobalRelativeToPICBase(OpFlags)) {
11860 Result = DAG.getNode(ISD::ADD, dl, PtrVT,
11861 DAG.getNode(X86ISD::GlobalBaseReg, dl, PtrVT), Result);
11864 // For globals that require a load from a stub to get the address, emit the
11866 if (isGlobalStubReference(OpFlags))
11867 Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Result,
11868 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
11869 false, false, false, 0);
11871 // If there was a non-zero offset that we didn't fold, create an explicit
11872 // addition for it.
11874 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result,
11875 DAG.getConstant(Offset, dl, PtrVT));
11881 X86TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
11882 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
11883 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
11884 return LowerGlobalAddress(GV, SDLoc(Op), Offset, DAG);
11888 GetTLSADDR(SelectionDAG &DAG, SDValue Chain, GlobalAddressSDNode *GA,
11889 SDValue *InFlag, const EVT PtrVT, unsigned ReturnReg,
11890 unsigned char OperandFlags, bool LocalDynamic = false) {
11891 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
11892 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
11894 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
11895 GA->getValueType(0),
11899 X86ISD::NodeType CallType = LocalDynamic ? X86ISD::TLSBASEADDR
11903 SDValue Ops[] = { Chain, TGA, *InFlag };
11904 Chain = DAG.getNode(CallType, dl, NodeTys, Ops);
11906 SDValue Ops[] = { Chain, TGA };
11907 Chain = DAG.getNode(CallType, dl, NodeTys, Ops);
11910 // TLSADDR will be codegen'ed as call. Inform MFI that function has calls.
11911 MFI->setAdjustsStack(true);
11912 MFI->setHasCalls(true);
11914 SDValue Flag = Chain.getValue(1);
11915 return DAG.getCopyFromReg(Chain, dl, ReturnReg, PtrVT, Flag);
11918 // Lower ISD::GlobalTLSAddress using the "general dynamic" model, 32 bit
11920 LowerToTLSGeneralDynamicModel32(GlobalAddressSDNode *GA, SelectionDAG &DAG,
11923 SDLoc dl(GA); // ? function entry point might be better
11924 SDValue Chain = DAG.getCopyToReg(DAG.getEntryNode(), dl, X86::EBX,
11925 DAG.getNode(X86ISD::GlobalBaseReg,
11926 SDLoc(), PtrVT), InFlag);
11927 InFlag = Chain.getValue(1);
11929 return GetTLSADDR(DAG, Chain, GA, &InFlag, PtrVT, X86::EAX, X86II::MO_TLSGD);
11932 // Lower ISD::GlobalTLSAddress using the "general dynamic" model, 64 bit
11934 LowerToTLSGeneralDynamicModel64(GlobalAddressSDNode *GA, SelectionDAG &DAG,
11936 return GetTLSADDR(DAG, DAG.getEntryNode(), GA, nullptr, PtrVT,
11937 X86::RAX, X86II::MO_TLSGD);
11940 static SDValue LowerToTLSLocalDynamicModel(GlobalAddressSDNode *GA,
11946 // Get the start address of the TLS block for this module.
11947 X86MachineFunctionInfo* MFI = DAG.getMachineFunction()
11948 .getInfo<X86MachineFunctionInfo>();
11949 MFI->incNumLocalDynamicTLSAccesses();
11953 Base = GetTLSADDR(DAG, DAG.getEntryNode(), GA, nullptr, PtrVT, X86::RAX,
11954 X86II::MO_TLSLD, /*LocalDynamic=*/true);
11957 SDValue Chain = DAG.getCopyToReg(DAG.getEntryNode(), dl, X86::EBX,
11958 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), InFlag);
11959 InFlag = Chain.getValue(1);
11960 Base = GetTLSADDR(DAG, Chain, GA, &InFlag, PtrVT, X86::EAX,
11961 X86II::MO_TLSLDM, /*LocalDynamic=*/true);
11964 // Note: the CleanupLocalDynamicTLSPass will remove redundant computations
11968 unsigned char OperandFlags = X86II::MO_DTPOFF;
11969 unsigned WrapperKind = X86ISD::Wrapper;
11970 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
11971 GA->getValueType(0),
11972 GA->getOffset(), OperandFlags);
11973 SDValue Offset = DAG.getNode(WrapperKind, dl, PtrVT, TGA);
11975 // Add x@dtpoff with the base.
11976 return DAG.getNode(ISD::ADD, dl, PtrVT, Offset, Base);
11979 // Lower ISD::GlobalTLSAddress using the "initial exec" or "local exec" model.
11980 static SDValue LowerToTLSExecModel(GlobalAddressSDNode *GA, SelectionDAG &DAG,
11981 const EVT PtrVT, TLSModel::Model model,
11982 bool is64Bit, bool isPIC) {
11985 // Get the Thread Pointer, which is %gs:0 (32-bit) or %fs:0 (64-bit).
11986 Value *Ptr = Constant::getNullValue(Type::getInt8PtrTy(*DAG.getContext(),
11987 is64Bit ? 257 : 256));
11989 SDValue ThreadPointer =
11990 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), DAG.getIntPtrConstant(0, dl),
11991 MachinePointerInfo(Ptr), false, false, false, 0);
11993 unsigned char OperandFlags = 0;
11994 // Most TLS accesses are not RIP relative, even on x86-64. One exception is
11996 unsigned WrapperKind = X86ISD::Wrapper;
11997 if (model == TLSModel::LocalExec) {
11998 OperandFlags = is64Bit ? X86II::MO_TPOFF : X86II::MO_NTPOFF;
11999 } else if (model == TLSModel::InitialExec) {
12001 OperandFlags = X86II::MO_GOTTPOFF;
12002 WrapperKind = X86ISD::WrapperRIP;
12004 OperandFlags = isPIC ? X86II::MO_GOTNTPOFF : X86II::MO_INDNTPOFF;
12007 llvm_unreachable("Unexpected model");
12010 // emit "addl x@ntpoff,%eax" (local exec)
12011 // or "addl x@indntpoff,%eax" (initial exec)
12012 // or "addl x@gotntpoff(%ebx) ,%eax" (initial exec, 32-bit pic)
12014 DAG.getTargetGlobalAddress(GA->getGlobal(), dl, GA->getValueType(0),
12015 GA->getOffset(), OperandFlags);
12016 SDValue Offset = DAG.getNode(WrapperKind, dl, PtrVT, TGA);
12018 if (model == TLSModel::InitialExec) {
12019 if (isPIC && !is64Bit) {
12020 Offset = DAG.getNode(ISD::ADD, dl, PtrVT,
12021 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT),
12025 Offset = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Offset,
12026 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
12027 false, false, false, 0);
12030 // The address of the thread local variable is the add of the thread
12031 // pointer with the offset of the variable.
12032 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
12036 X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
12038 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
12039 const GlobalValue *GV = GA->getGlobal();
12040 auto PtrVT = getPointerTy(DAG.getDataLayout());
12042 if (Subtarget->isTargetELF()) {
12043 if (DAG.getTarget().Options.EmulatedTLS)
12044 return LowerToTLSEmulatedModel(GA, DAG);
12045 TLSModel::Model model = DAG.getTarget().getTLSModel(GV);
12047 case TLSModel::GeneralDynamic:
12048 if (Subtarget->is64Bit())
12049 return LowerToTLSGeneralDynamicModel64(GA, DAG, PtrVT);
12050 return LowerToTLSGeneralDynamicModel32(GA, DAG, PtrVT);
12051 case TLSModel::LocalDynamic:
12052 return LowerToTLSLocalDynamicModel(GA, DAG, PtrVT,
12053 Subtarget->is64Bit());
12054 case TLSModel::InitialExec:
12055 case TLSModel::LocalExec:
12056 return LowerToTLSExecModel(GA, DAG, PtrVT, model, Subtarget->is64Bit(),
12057 DAG.getTarget().getRelocationModel() ==
12060 llvm_unreachable("Unknown TLS model.");
12063 if (Subtarget->isTargetDarwin()) {
12064 // Darwin only has one model of TLS. Lower to that.
12065 unsigned char OpFlag = 0;
12066 unsigned WrapperKind = Subtarget->isPICStyleRIPRel() ?
12067 X86ISD::WrapperRIP : X86ISD::Wrapper;
12069 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
12070 // global base reg.
12071 bool PIC32 = (DAG.getTarget().getRelocationModel() == Reloc::PIC_) &&
12072 !Subtarget->is64Bit();
12074 OpFlag = X86II::MO_TLVP_PIC_BASE;
12076 OpFlag = X86II::MO_TLVP;
12078 SDValue Result = DAG.getTargetGlobalAddress(GA->getGlobal(), DL,
12079 GA->getValueType(0),
12080 GA->getOffset(), OpFlag);
12081 SDValue Offset = DAG.getNode(WrapperKind, DL, PtrVT, Result);
12083 // With PIC32, the address is actually $g + Offset.
12085 Offset = DAG.getNode(ISD::ADD, DL, PtrVT,
12086 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT),
12089 // Lowering the machine isd will make sure everything is in the right
12091 SDValue Chain = DAG.getEntryNode();
12092 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
12093 SDValue Args[] = { Chain, Offset };
12094 Chain = DAG.getNode(X86ISD::TLSCALL, DL, NodeTys, Args);
12096 // TLSCALL will be codegen'ed as call. Inform MFI that function has calls.
12097 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
12098 MFI->setAdjustsStack(true);
12100 // And our return value (tls address) is in the standard call return value
12102 unsigned Reg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
12103 return DAG.getCopyFromReg(Chain, DL, Reg, PtrVT, Chain.getValue(1));
12106 if (Subtarget->isTargetKnownWindowsMSVC() ||
12107 Subtarget->isTargetWindowsGNU()) {
12108 // Just use the implicit TLS architecture
12109 // Need to generate someting similar to:
12110 // mov rdx, qword [gs:abs 58H]; Load pointer to ThreadLocalStorage
12112 // mov ecx, dword [rel _tls_index]: Load index (from C runtime)
12113 // mov rcx, qword [rdx+rcx*8]
12114 // mov eax, .tls$:tlsvar
12115 // [rax+rcx] contains the address
12116 // Windows 64bit: gs:0x58
12117 // Windows 32bit: fs:__tls_array
12120 SDValue Chain = DAG.getEntryNode();
12122 // Get the Thread Pointer, which is %fs:__tls_array (32-bit) or
12123 // %gs:0x58 (64-bit). On MinGW, __tls_array is not available, so directly
12124 // use its literal value of 0x2C.
12125 Value *Ptr = Constant::getNullValue(Subtarget->is64Bit()
12126 ? Type::getInt8PtrTy(*DAG.getContext(),
12128 : Type::getInt32PtrTy(*DAG.getContext(),
12131 SDValue TlsArray = Subtarget->is64Bit()
12132 ? DAG.getIntPtrConstant(0x58, dl)
12133 : (Subtarget->isTargetWindowsGNU()
12134 ? DAG.getIntPtrConstant(0x2C, dl)
12135 : DAG.getExternalSymbol("_tls_array", PtrVT));
12137 SDValue ThreadPointer =
12138 DAG.getLoad(PtrVT, dl, Chain, TlsArray, MachinePointerInfo(Ptr), false,
12142 if (GV->getThreadLocalMode() == GlobalVariable::LocalExecTLSModel) {
12143 res = ThreadPointer;
12145 // Load the _tls_index variable
12146 SDValue IDX = DAG.getExternalSymbol("_tls_index", PtrVT);
12147 if (Subtarget->is64Bit())
12148 IDX = DAG.getExtLoad(ISD::ZEXTLOAD, dl, PtrVT, Chain, IDX,
12149 MachinePointerInfo(), MVT::i32, false, false,
12152 IDX = DAG.getLoad(PtrVT, dl, Chain, IDX, MachinePointerInfo(), false,
12155 auto &DL = DAG.getDataLayout();
12157 DAG.getConstant(Log2_64_Ceil(DL.getPointerSize()), dl, PtrVT);
12158 IDX = DAG.getNode(ISD::SHL, dl, PtrVT, IDX, Scale);
12160 res = DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, IDX);
12163 res = DAG.getLoad(PtrVT, dl, Chain, res, MachinePointerInfo(), false, false,
12166 // Get the offset of start of .tls section
12167 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
12168 GA->getValueType(0),
12169 GA->getOffset(), X86II::MO_SECREL);
12170 SDValue Offset = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, TGA);
12172 // The address of the thread local variable is the add of the thread
12173 // pointer with the offset of the variable.
12174 return DAG.getNode(ISD::ADD, dl, PtrVT, res, Offset);
12177 llvm_unreachable("TLS not implemented for this target.");
12180 /// LowerShiftParts - Lower SRA_PARTS and friends, which return two i32 values
12181 /// and take a 2 x i32 value to shift plus a shift amount.
12182 static SDValue LowerShiftParts(SDValue Op, SelectionDAG &DAG) {
12183 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
12184 MVT VT = Op.getSimpleValueType();
12185 unsigned VTBits = VT.getSizeInBits();
12187 bool isSRA = Op.getOpcode() == ISD::SRA_PARTS;
12188 SDValue ShOpLo = Op.getOperand(0);
12189 SDValue ShOpHi = Op.getOperand(1);
12190 SDValue ShAmt = Op.getOperand(2);
12191 // X86ISD::SHLD and X86ISD::SHRD have defined overflow behavior but the
12192 // generic ISD nodes haven't. Insert an AND to be safe, it's optimized away
12194 SDValue SafeShAmt = DAG.getNode(ISD::AND, dl, MVT::i8, ShAmt,
12195 DAG.getConstant(VTBits - 1, dl, MVT::i8));
12196 SDValue Tmp1 = isSRA ? DAG.getNode(ISD::SRA, dl, VT, ShOpHi,
12197 DAG.getConstant(VTBits - 1, dl, MVT::i8))
12198 : DAG.getConstant(0, dl, VT);
12200 SDValue Tmp2, Tmp3;
12201 if (Op.getOpcode() == ISD::SHL_PARTS) {
12202 Tmp2 = DAG.getNode(X86ISD::SHLD, dl, VT, ShOpHi, ShOpLo, ShAmt);
12203 Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, SafeShAmt);
12205 Tmp2 = DAG.getNode(X86ISD::SHRD, dl, VT, ShOpLo, ShOpHi, ShAmt);
12206 Tmp3 = DAG.getNode(isSRA ? ISD::SRA : ISD::SRL, dl, VT, ShOpHi, SafeShAmt);
12209 // If the shift amount is larger or equal than the width of a part we can't
12210 // rely on the results of shld/shrd. Insert a test and select the appropriate
12211 // values for large shift amounts.
12212 SDValue AndNode = DAG.getNode(ISD::AND, dl, MVT::i8, ShAmt,
12213 DAG.getConstant(VTBits, dl, MVT::i8));
12214 SDValue Cond = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
12215 AndNode, DAG.getConstant(0, dl, MVT::i8));
12218 SDValue CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
12219 SDValue Ops0[4] = { Tmp2, Tmp3, CC, Cond };
12220 SDValue Ops1[4] = { Tmp3, Tmp1, CC, Cond };
12222 if (Op.getOpcode() == ISD::SHL_PARTS) {
12223 Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0);
12224 Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1);
12226 Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0);
12227 Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1);
12230 SDValue Ops[2] = { Lo, Hi };
12231 return DAG.getMergeValues(Ops, dl);
12234 SDValue X86TargetLowering::LowerSINT_TO_FP(SDValue Op,
12235 SelectionDAG &DAG) const {
12236 SDValue Src = Op.getOperand(0);
12237 MVT SrcVT = Src.getSimpleValueType();
12238 MVT VT = Op.getSimpleValueType();
12241 if (SrcVT.isVector()) {
12242 if (SrcVT == MVT::v2i32 && VT == MVT::v2f64) {
12243 return DAG.getNode(X86ISD::CVTDQ2PD, dl, VT,
12244 DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4i32, Src,
12245 DAG.getUNDEF(SrcVT)));
12247 if (SrcVT.getVectorElementType() == MVT::i1) {
12248 MVT IntegerVT = MVT::getVectorVT(MVT::i32, SrcVT.getVectorNumElements());
12249 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(),
12250 DAG.getNode(ISD::SIGN_EXTEND, dl, IntegerVT, Src));
12255 assert(SrcVT <= MVT::i64 && SrcVT >= MVT::i16 &&
12256 "Unknown SINT_TO_FP to lower!");
12258 // These are really Legal; return the operand so the caller accepts it as
12260 if (SrcVT == MVT::i32 && isScalarFPTypeInSSEReg(Op.getValueType()))
12262 if (SrcVT == MVT::i64 && isScalarFPTypeInSSEReg(Op.getValueType()) &&
12263 Subtarget->is64Bit()) {
12267 unsigned Size = SrcVT.getSizeInBits()/8;
12268 MachineFunction &MF = DAG.getMachineFunction();
12269 auto PtrVT = getPointerTy(MF.getDataLayout());
12270 int SSFI = MF.getFrameInfo()->CreateStackObject(Size, Size, false);
12271 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12272 SDValue Chain = DAG.getStore(
12273 DAG.getEntryNode(), dl, Op.getOperand(0), StackSlot,
12274 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI), false,
12276 return BuildFILD(Op, SrcVT, Chain, StackSlot, DAG);
12279 SDValue X86TargetLowering::BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain,
12281 SelectionDAG &DAG) const {
12285 bool useSSE = isScalarFPTypeInSSEReg(Op.getValueType());
12287 Tys = DAG.getVTList(MVT::f64, MVT::Other, MVT::Glue);
12289 Tys = DAG.getVTList(Op.getValueType(), MVT::Other);
12291 unsigned ByteSize = SrcVT.getSizeInBits()/8;
12293 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(StackSlot);
12294 MachineMemOperand *MMO;
12296 int SSFI = FI->getIndex();
12297 MMO = DAG.getMachineFunction().getMachineMemOperand(
12298 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12299 MachineMemOperand::MOLoad, ByteSize, ByteSize);
12301 MMO = cast<LoadSDNode>(StackSlot)->getMemOperand();
12302 StackSlot = StackSlot.getOperand(1);
12304 SDValue Ops[] = { Chain, StackSlot, DAG.getValueType(SrcVT) };
12305 SDValue Result = DAG.getMemIntrinsicNode(useSSE ? X86ISD::FILD_FLAG :
12307 Tys, Ops, SrcVT, MMO);
12310 Chain = Result.getValue(1);
12311 SDValue InFlag = Result.getValue(2);
12313 // FIXME: Currently the FST is flagged to the FILD_FLAG. This
12314 // shouldn't be necessary except that RFP cannot be live across
12315 // multiple blocks. When stackifier is fixed, they can be uncoupled.
12316 MachineFunction &MF = DAG.getMachineFunction();
12317 unsigned SSFISize = Op.getValueType().getSizeInBits()/8;
12318 int SSFI = MF.getFrameInfo()->CreateStackObject(SSFISize, SSFISize, false);
12319 auto PtrVT = getPointerTy(MF.getDataLayout());
12320 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12321 Tys = DAG.getVTList(MVT::Other);
12323 Chain, Result, StackSlot, DAG.getValueType(Op.getValueType()), InFlag
12325 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
12326 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12327 MachineMemOperand::MOStore, SSFISize, SSFISize);
12329 Chain = DAG.getMemIntrinsicNode(X86ISD::FST, DL, Tys,
12330 Ops, Op.getValueType(), MMO);
12331 Result = DAG.getLoad(
12332 Op.getValueType(), DL, Chain, StackSlot,
12333 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12334 false, false, false, 0);
12340 // LowerUINT_TO_FP_i64 - 64-bit unsigned integer to double expansion.
12341 SDValue X86TargetLowering::LowerUINT_TO_FP_i64(SDValue Op,
12342 SelectionDAG &DAG) const {
12343 // This algorithm is not obvious. Here it is what we're trying to output:
12346 punpckldq (c0), %xmm0 // c0: (uint4){ 0x43300000U, 0x45300000U, 0U, 0U }
12347 subpd (c1), %xmm0 // c1: (double2){ 0x1.0p52, 0x1.0p52 * 0x1.0p32 }
12349 haddpd %xmm0, %xmm0
12351 pshufd $0x4e, %xmm0, %xmm1
12357 LLVMContext *Context = DAG.getContext();
12359 // Build some magic constants.
12360 static const uint32_t CV0[] = { 0x43300000, 0x45300000, 0, 0 };
12361 Constant *C0 = ConstantDataVector::get(*Context, CV0);
12362 auto PtrVT = getPointerTy(DAG.getDataLayout());
12363 SDValue CPIdx0 = DAG.getConstantPool(C0, PtrVT, 16);
12365 SmallVector<Constant*,2> CV1;
12367 ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
12368 APInt(64, 0x4330000000000000ULL))));
12370 ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
12371 APInt(64, 0x4530000000000000ULL))));
12372 Constant *C1 = ConstantVector::get(CV1);
12373 SDValue CPIdx1 = DAG.getConstantPool(C1, PtrVT, 16);
12375 // Load the 64-bit value into an XMM register.
12376 SDValue XR1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
12379 DAG.getLoad(MVT::v4i32, dl, DAG.getEntryNode(), CPIdx0,
12380 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
12381 false, false, false, 16);
12383 getUnpackl(DAG, dl, MVT::v4i32, DAG.getBitcast(MVT::v4i32, XR1), CLod0);
12386 DAG.getLoad(MVT::v2f64, dl, CLod0.getValue(1), CPIdx1,
12387 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
12388 false, false, false, 16);
12389 SDValue XR2F = DAG.getBitcast(MVT::v2f64, Unpck1);
12390 // TODO: Are there any fast-math-flags to propagate here?
12391 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::v2f64, XR2F, CLod1);
12394 if (Subtarget->hasSSE3()) {
12395 // FIXME: The 'haddpd' instruction may be slower than 'movhlps + addsd'.
12396 Result = DAG.getNode(X86ISD::FHADD, dl, MVT::v2f64, Sub, Sub);
12398 SDValue S2F = DAG.getBitcast(MVT::v4i32, Sub);
12399 SDValue Shuffle = getTargetShuffleNode(X86ISD::PSHUFD, dl, MVT::v4i32,
12401 Result = DAG.getNode(ISD::FADD, dl, MVT::v2f64,
12402 DAG.getBitcast(MVT::v2f64, Shuffle), Sub);
12405 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Result,
12406 DAG.getIntPtrConstant(0, dl));
12409 // LowerUINT_TO_FP_i32 - 32-bit unsigned integer to float expansion.
12410 SDValue X86TargetLowering::LowerUINT_TO_FP_i32(SDValue Op,
12411 SelectionDAG &DAG) const {
12413 // FP constant to bias correct the final result.
12414 SDValue Bias = DAG.getConstantFP(BitsToDouble(0x4330000000000000ULL), dl,
12417 // Load the 32-bit value into an XMM register.
12418 SDValue Load = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32,
12421 // Zero out the upper parts of the register.
12422 Load = getShuffleVectorZeroOrUndef(Load, 0, true, Subtarget, DAG);
12424 Load = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
12425 DAG.getBitcast(MVT::v2f64, Load),
12426 DAG.getIntPtrConstant(0, dl));
12428 // Or the load with the bias.
12429 SDValue Or = DAG.getNode(
12430 ISD::OR, dl, MVT::v2i64,
12431 DAG.getBitcast(MVT::v2i64,
12432 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f64, Load)),
12433 DAG.getBitcast(MVT::v2i64,
12434 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f64, Bias)));
12436 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
12437 DAG.getBitcast(MVT::v2f64, Or), DAG.getIntPtrConstant(0, dl));
12439 // Subtract the bias.
12440 // TODO: Are there any fast-math-flags to propagate here?
12441 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Or, Bias);
12443 // Handle final rounding.
12444 EVT DestVT = Op.getValueType();
12446 if (DestVT.bitsLT(MVT::f64))
12447 return DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
12448 DAG.getIntPtrConstant(0, dl));
12449 if (DestVT.bitsGT(MVT::f64))
12450 return DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
12452 // Handle final rounding.
12456 static SDValue lowerUINT_TO_FP_vXi32(SDValue Op, SelectionDAG &DAG,
12457 const X86Subtarget &Subtarget) {
12458 // The algorithm is the following:
12459 // #ifdef __SSE4_1__
12460 // uint4 lo = _mm_blend_epi16( v, (uint4) 0x4b000000, 0xaa);
12461 // uint4 hi = _mm_blend_epi16( _mm_srli_epi32(v,16),
12462 // (uint4) 0x53000000, 0xaa);
12464 // uint4 lo = (v & (uint4) 0xffff) | (uint4) 0x4b000000;
12465 // uint4 hi = (v >> 16) | (uint4) 0x53000000;
12467 // float4 fhi = (float4) hi - (0x1.0p39f + 0x1.0p23f);
12468 // return (float4) lo + fhi;
12470 // We shouldn't use it when unsafe-fp-math is enabled though: we might later
12471 // reassociate the two FADDs, and if we do that, the algorithm fails
12472 // spectacularly (PR24512).
12473 // FIXME: If we ever have some kind of Machine FMF, this should be marked
12474 // as non-fast and always be enabled. Why isn't SDAG FMF enough? Because
12475 // there's also the MachineCombiner reassociations happening on Machine IR.
12476 if (DAG.getTarget().Options.UnsafeFPMath)
12480 SDValue V = Op->getOperand(0);
12481 EVT VecIntVT = V.getValueType();
12482 bool Is128 = VecIntVT == MVT::v4i32;
12483 EVT VecFloatVT = Is128 ? MVT::v4f32 : MVT::v8f32;
12484 // If we convert to something else than the supported type, e.g., to v4f64,
12486 if (VecFloatVT != Op->getValueType(0))
12489 unsigned NumElts = VecIntVT.getVectorNumElements();
12490 assert((VecIntVT == MVT::v4i32 || VecIntVT == MVT::v8i32) &&
12491 "Unsupported custom type");
12492 assert(NumElts <= 8 && "The size of the constant array must be fixed");
12494 // In the #idef/#else code, we have in common:
12495 // - The vector of constants:
12501 // Create the splat vector for 0x4b000000.
12502 SDValue CstLow = DAG.getConstant(0x4b000000, DL, MVT::i32);
12503 SDValue CstLowArray[] = {CstLow, CstLow, CstLow, CstLow,
12504 CstLow, CstLow, CstLow, CstLow};
12505 SDValue VecCstLow = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12506 makeArrayRef(&CstLowArray[0], NumElts));
12507 // Create the splat vector for 0x53000000.
12508 SDValue CstHigh = DAG.getConstant(0x53000000, DL, MVT::i32);
12509 SDValue CstHighArray[] = {CstHigh, CstHigh, CstHigh, CstHigh,
12510 CstHigh, CstHigh, CstHigh, CstHigh};
12511 SDValue VecCstHigh = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12512 makeArrayRef(&CstHighArray[0], NumElts));
12514 // Create the right shift.
12515 SDValue CstShift = DAG.getConstant(16, DL, MVT::i32);
12516 SDValue CstShiftArray[] = {CstShift, CstShift, CstShift, CstShift,
12517 CstShift, CstShift, CstShift, CstShift};
12518 SDValue VecCstShift = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12519 makeArrayRef(&CstShiftArray[0], NumElts));
12520 SDValue HighShift = DAG.getNode(ISD::SRL, DL, VecIntVT, V, VecCstShift);
12523 if (Subtarget.hasSSE41()) {
12524 EVT VecI16VT = Is128 ? MVT::v8i16 : MVT::v16i16;
12525 // uint4 lo = _mm_blend_epi16( v, (uint4) 0x4b000000, 0xaa);
12526 SDValue VecCstLowBitcast = DAG.getBitcast(VecI16VT, VecCstLow);
12527 SDValue VecBitcast = DAG.getBitcast(VecI16VT, V);
12528 // Low will be bitcasted right away, so do not bother bitcasting back to its
12530 Low = DAG.getNode(X86ISD::BLENDI, DL, VecI16VT, VecBitcast,
12531 VecCstLowBitcast, DAG.getConstant(0xaa, DL, MVT::i32));
12532 // uint4 hi = _mm_blend_epi16( _mm_srli_epi32(v,16),
12533 // (uint4) 0x53000000, 0xaa);
12534 SDValue VecCstHighBitcast = DAG.getBitcast(VecI16VT, VecCstHigh);
12535 SDValue VecShiftBitcast = DAG.getBitcast(VecI16VT, HighShift);
12536 // High will be bitcasted right away, so do not bother bitcasting back to
12537 // its original type.
12538 High = DAG.getNode(X86ISD::BLENDI, DL, VecI16VT, VecShiftBitcast,
12539 VecCstHighBitcast, DAG.getConstant(0xaa, DL, MVT::i32));
12541 SDValue CstMask = DAG.getConstant(0xffff, DL, MVT::i32);
12542 SDValue VecCstMask = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT, CstMask,
12543 CstMask, CstMask, CstMask);
12544 // uint4 lo = (v & (uint4) 0xffff) | (uint4) 0x4b000000;
12545 SDValue LowAnd = DAG.getNode(ISD::AND, DL, VecIntVT, V, VecCstMask);
12546 Low = DAG.getNode(ISD::OR, DL, VecIntVT, LowAnd, VecCstLow);
12548 // uint4 hi = (v >> 16) | (uint4) 0x53000000;
12549 High = DAG.getNode(ISD::OR, DL, VecIntVT, HighShift, VecCstHigh);
12552 // Create the vector constant for -(0x1.0p39f + 0x1.0p23f).
12553 SDValue CstFAdd = DAG.getConstantFP(
12554 APFloat(APFloat::IEEEsingle, APInt(32, 0xD3000080)), DL, MVT::f32);
12555 SDValue CstFAddArray[] = {CstFAdd, CstFAdd, CstFAdd, CstFAdd,
12556 CstFAdd, CstFAdd, CstFAdd, CstFAdd};
12557 SDValue VecCstFAdd = DAG.getNode(ISD::BUILD_VECTOR, DL, VecFloatVT,
12558 makeArrayRef(&CstFAddArray[0], NumElts));
12560 // float4 fhi = (float4) hi - (0x1.0p39f + 0x1.0p23f);
12561 SDValue HighBitcast = DAG.getBitcast(VecFloatVT, High);
12562 // TODO: Are there any fast-math-flags to propagate here?
12564 DAG.getNode(ISD::FADD, DL, VecFloatVT, HighBitcast, VecCstFAdd);
12565 // return (float4) lo + fhi;
12566 SDValue LowBitcast = DAG.getBitcast(VecFloatVT, Low);
12567 return DAG.getNode(ISD::FADD, DL, VecFloatVT, LowBitcast, FHigh);
12570 SDValue X86TargetLowering::lowerUINT_TO_FP_vec(SDValue Op,
12571 SelectionDAG &DAG) const {
12572 SDValue N0 = Op.getOperand(0);
12573 MVT SVT = N0.getSimpleValueType();
12576 switch (SVT.SimpleTy) {
12578 llvm_unreachable("Custom UINT_TO_FP is not supported!");
12583 MVT NVT = MVT::getVectorVT(MVT::i32, SVT.getVectorNumElements());
12584 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(),
12585 DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, N0));
12589 return lowerUINT_TO_FP_vXi32(Op, DAG, *Subtarget);
12592 if (Subtarget->hasAVX512())
12593 return DAG.getNode(ISD::UINT_TO_FP, dl, Op.getValueType(),
12594 DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v16i32, N0));
12596 llvm_unreachable(nullptr);
12599 SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
12600 SelectionDAG &DAG) const {
12601 SDValue N0 = Op.getOperand(0);
12603 auto PtrVT = getPointerTy(DAG.getDataLayout());
12605 if (Op.getValueType().isVector())
12606 return lowerUINT_TO_FP_vec(Op, DAG);
12608 // Since UINT_TO_FP is legal (it's marked custom), dag combiner won't
12609 // optimize it to a SINT_TO_FP when the sign bit is known zero. Perform
12610 // the optimization here.
12611 if (DAG.SignBitIsZero(N0))
12612 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(), N0);
12614 MVT SrcVT = N0.getSimpleValueType();
12615 MVT DstVT = Op.getSimpleValueType();
12617 if (Subtarget->hasAVX512() && isScalarFPTypeInSSEReg(DstVT) &&
12618 (SrcVT == MVT::i32 || (SrcVT == MVT::i64 && Subtarget->is64Bit()))) {
12619 // Conversions from unsigned i32 to f32/f64 are legal,
12620 // using VCVTUSI2SS/SD. Same for i64 in 64-bit mode.
12624 if (SrcVT == MVT::i64 && DstVT == MVT::f64 && X86ScalarSSEf64)
12625 return LowerUINT_TO_FP_i64(Op, DAG);
12626 if (SrcVT == MVT::i32 && X86ScalarSSEf64)
12627 return LowerUINT_TO_FP_i32(Op, DAG);
12628 if (Subtarget->is64Bit() && SrcVT == MVT::i64 && DstVT == MVT::f32)
12631 // Make a 64-bit buffer, and use it to build an FILD.
12632 SDValue StackSlot = DAG.CreateStackTemporary(MVT::i64);
12633 if (SrcVT == MVT::i32) {
12634 SDValue WordOff = DAG.getConstant(4, dl, PtrVT);
12635 SDValue OffsetSlot = DAG.getNode(ISD::ADD, dl, PtrVT, StackSlot, WordOff);
12636 SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
12637 StackSlot, MachinePointerInfo(),
12639 SDValue Store2 = DAG.getStore(Store1, dl, DAG.getConstant(0, dl, MVT::i32),
12640 OffsetSlot, MachinePointerInfo(),
12642 SDValue Fild = BuildFILD(Op, MVT::i64, Store2, StackSlot, DAG);
12646 assert(SrcVT == MVT::i64 && "Unexpected type in UINT_TO_FP");
12647 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
12648 StackSlot, MachinePointerInfo(),
12650 // For i64 source, we need to add the appropriate power of 2 if the input
12651 // was negative. This is the same as the optimization in
12652 // DAGTypeLegalizer::ExpandIntOp_UNIT_TO_FP, and for it to be safe here,
12653 // we must be careful to do the computation in x87 extended precision, not
12654 // in SSE. (The generic code can't know it's OK to do this, or how to.)
12655 int SSFI = cast<FrameIndexSDNode>(StackSlot)->getIndex();
12656 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
12657 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12658 MachineMemOperand::MOLoad, 8, 8);
12660 SDVTList Tys = DAG.getVTList(MVT::f80, MVT::Other);
12661 SDValue Ops[] = { Store, StackSlot, DAG.getValueType(MVT::i64) };
12662 SDValue Fild = DAG.getMemIntrinsicNode(X86ISD::FILD, dl, Tys, Ops,
12665 APInt FF(32, 0x5F800000ULL);
12667 // Check whether the sign bit is set.
12668 SDValue SignSet = DAG.getSetCC(
12669 dl, getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), MVT::i64),
12670 Op.getOperand(0), DAG.getConstant(0, dl, MVT::i64), ISD::SETLT);
12672 // Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
12673 SDValue FudgePtr = DAG.getConstantPool(
12674 ConstantInt::get(*DAG.getContext(), FF.zext(64)), PtrVT);
12676 // Get a pointer to FF if the sign bit was set, or to 0 otherwise.
12677 SDValue Zero = DAG.getIntPtrConstant(0, dl);
12678 SDValue Four = DAG.getIntPtrConstant(4, dl);
12679 SDValue Offset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(), SignSet,
12681 FudgePtr = DAG.getNode(ISD::ADD, dl, PtrVT, FudgePtr, Offset);
12683 // Load the value out, extending it from f32 to f80.
12684 // FIXME: Avoid the extend by constructing the right constant pool?
12685 SDValue Fudge = DAG.getExtLoad(
12686 ISD::EXTLOAD, dl, MVT::f80, DAG.getEntryNode(), FudgePtr,
12687 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()), MVT::f32,
12688 false, false, false, 4);
12689 // Extend everything to 80 bits to force it to be done on x87.
12690 // TODO: Are there any fast-math-flags to propagate here?
12691 SDValue Add = DAG.getNode(ISD::FADD, dl, MVT::f80, Fild, Fudge);
12692 return DAG.getNode(ISD::FP_ROUND, dl, DstVT, Add,
12693 DAG.getIntPtrConstant(0, dl));
12696 // If the given FP_TO_SINT (IsSigned) or FP_TO_UINT (!IsSigned) operation
12697 // is legal, or has an f16 source (which needs to be promoted to f32),
12698 // just return an <SDValue(), SDValue()> pair.
12699 // Otherwise it is assumed to be a conversion from one of f32, f64 or f80
12700 // to i16, i32 or i64, and we lower it to a legal sequence.
12701 // If lowered to the final integer result we return a <result, SDValue()> pair.
12702 // Otherwise we lower it to a sequence ending with a FIST, return a
12703 // <FIST, StackSlot> pair, and the caller is responsible for loading
12704 // the final integer result from StackSlot.
12705 std::pair<SDValue,SDValue>
12706 X86TargetLowering::FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG,
12707 bool IsSigned, bool IsReplace) const {
12710 EVT DstTy = Op.getValueType();
12711 EVT TheVT = Op.getOperand(0).getValueType();
12712 auto PtrVT = getPointerTy(DAG.getDataLayout());
12714 if (TheVT == MVT::f16)
12715 // We need to promote the f16 to f32 before using the lowering
12716 // in this routine.
12717 return std::make_pair(SDValue(), SDValue());
12719 assert((TheVT == MVT::f32 ||
12720 TheVT == MVT::f64 ||
12721 TheVT == MVT::f80) &&
12722 "Unexpected FP operand type in FP_TO_INTHelper");
12724 // If using FIST to compute an unsigned i64, we'll need some fixup
12725 // to handle values above the maximum signed i64. A FIST is always
12726 // used for the 32-bit subtarget, but also for f80 on a 64-bit target.
12727 bool UnsignedFixup = !IsSigned &&
12728 DstTy == MVT::i64 &&
12729 (!Subtarget->is64Bit() ||
12730 !isScalarFPTypeInSSEReg(TheVT));
12732 if (!IsSigned && DstTy != MVT::i64 && !Subtarget->hasAVX512()) {
12733 // Replace the fp-to-uint32 operation with an fp-to-sint64 FIST.
12734 // The low 32 bits of the fist result will have the correct uint32 result.
12735 assert(DstTy == MVT::i32 && "Unexpected FP_TO_UINT");
12739 assert(DstTy.getSimpleVT() <= MVT::i64 &&
12740 DstTy.getSimpleVT() >= MVT::i16 &&
12741 "Unknown FP_TO_INT to lower!");
12743 // These are really Legal.
12744 if (DstTy == MVT::i32 &&
12745 isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
12746 return std::make_pair(SDValue(), SDValue());
12747 if (Subtarget->is64Bit() &&
12748 DstTy == MVT::i64 &&
12749 isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
12750 return std::make_pair(SDValue(), SDValue());
12752 // We lower FP->int64 into FISTP64 followed by a load from a temporary
12754 MachineFunction &MF = DAG.getMachineFunction();
12755 unsigned MemSize = DstTy.getSizeInBits()/8;
12756 int SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
12757 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12760 switch (DstTy.getSimpleVT().SimpleTy) {
12761 default: llvm_unreachable("Invalid FP_TO_SINT to lower!");
12762 case MVT::i16: Opc = X86ISD::FP_TO_INT16_IN_MEM; break;
12763 case MVT::i32: Opc = X86ISD::FP_TO_INT32_IN_MEM; break;
12764 case MVT::i64: Opc = X86ISD::FP_TO_INT64_IN_MEM; break;
12767 SDValue Chain = DAG.getEntryNode();
12768 SDValue Value = Op.getOperand(0);
12769 SDValue Adjust; // 0x0 or 0x80000000, for result sign bit adjustment.
12771 if (UnsignedFixup) {
12773 // Conversion to unsigned i64 is implemented with a select,
12774 // depending on whether the source value fits in the range
12775 // of a signed i64. Let Thresh be the FP equivalent of
12776 // 0x8000000000000000ULL.
12778 // Adjust i32 = (Value < Thresh) ? 0 : 0x80000000;
12779 // FistSrc = (Value < Thresh) ? Value : (Value - Thresh);
12780 // Fist-to-mem64 FistSrc
12781 // Add 0 or 0x800...0ULL to the 64-bit result, which is equivalent
12782 // to XOR'ing the high 32 bits with Adjust.
12784 // Being a power of 2, Thresh is exactly representable in all FP formats.
12785 // For X87 we'd like to use the smallest FP type for this constant, but
12786 // for DAG type consistency we have to match the FP operand type.
12788 APFloat Thresh(APFloat::IEEEsingle, APInt(32, 0x5f000000));
12789 LLVM_ATTRIBUTE_UNUSED APFloat::opStatus Status = APFloat::opOK;
12790 bool LosesInfo = false;
12791 if (TheVT == MVT::f64)
12792 // The rounding mode is irrelevant as the conversion should be exact.
12793 Status = Thresh.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
12795 else if (TheVT == MVT::f80)
12796 Status = Thresh.convert(APFloat::x87DoubleExtended,
12797 APFloat::rmNearestTiesToEven, &LosesInfo);
12799 assert(Status == APFloat::opOK && !LosesInfo &&
12800 "FP conversion should have been exact");
12802 SDValue ThreshVal = DAG.getConstantFP(Thresh, DL, TheVT);
12804 SDValue Cmp = DAG.getSetCC(DL,
12805 getSetCCResultType(DAG.getDataLayout(),
12806 *DAG.getContext(), TheVT),
12807 Value, ThreshVal, ISD::SETLT);
12808 Adjust = DAG.getSelect(DL, MVT::i32, Cmp,
12809 DAG.getConstant(0, DL, MVT::i32),
12810 DAG.getConstant(0x80000000, DL, MVT::i32));
12811 SDValue Sub = DAG.getNode(ISD::FSUB, DL, TheVT, Value, ThreshVal);
12812 Cmp = DAG.getSetCC(DL, getSetCCResultType(DAG.getDataLayout(),
12813 *DAG.getContext(), TheVT),
12814 Value, ThreshVal, ISD::SETLT);
12815 Value = DAG.getSelect(DL, TheVT, Cmp, Value, Sub);
12818 // FIXME This causes a redundant load/store if the SSE-class value is already
12819 // in memory, such as if it is on the callstack.
12820 if (isScalarFPTypeInSSEReg(TheVT)) {
12821 assert(DstTy == MVT::i64 && "Invalid FP_TO_SINT to lower!");
12822 Chain = DAG.getStore(Chain, DL, Value, StackSlot,
12823 MachinePointerInfo::getFixedStack(MF, SSFI), false,
12825 SDVTList Tys = DAG.getVTList(Op.getOperand(0).getValueType(), MVT::Other);
12827 Chain, StackSlot, DAG.getValueType(TheVT)
12830 MachineMemOperand *MMO =
12831 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
12832 MachineMemOperand::MOLoad, MemSize, MemSize);
12833 Value = DAG.getMemIntrinsicNode(X86ISD::FLD, DL, Tys, Ops, DstTy, MMO);
12834 Chain = Value.getValue(1);
12835 SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
12836 StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12839 MachineMemOperand *MMO =
12840 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
12841 MachineMemOperand::MOStore, MemSize, MemSize);
12843 if (UnsignedFixup) {
12845 // Insert the FIST, load its result as two i32's,
12846 // and XOR the high i32 with Adjust.
12848 SDValue FistOps[] = { Chain, Value, StackSlot };
12849 SDValue FIST = DAG.getMemIntrinsicNode(Opc, DL, DAG.getVTList(MVT::Other),
12850 FistOps, DstTy, MMO);
12852 SDValue Low32 = DAG.getLoad(MVT::i32, DL, FIST, StackSlot,
12853 MachinePointerInfo(),
12854 false, false, false, 0);
12855 SDValue HighAddr = DAG.getNode(ISD::ADD, DL, PtrVT, StackSlot,
12856 DAG.getConstant(4, DL, PtrVT));
12858 SDValue High32 = DAG.getLoad(MVT::i32, DL, FIST, HighAddr,
12859 MachinePointerInfo(),
12860 false, false, false, 0);
12861 High32 = DAG.getNode(ISD::XOR, DL, MVT::i32, High32, Adjust);
12863 if (Subtarget->is64Bit()) {
12864 // Join High32 and Low32 into a 64-bit result.
12865 // (High32 << 32) | Low32
12866 Low32 = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, Low32);
12867 High32 = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i64, High32);
12868 High32 = DAG.getNode(ISD::SHL, DL, MVT::i64, High32,
12869 DAG.getConstant(32, DL, MVT::i8));
12870 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i64, High32, Low32);
12871 return std::make_pair(Result, SDValue());
12874 SDValue ResultOps[] = { Low32, High32 };
12876 SDValue pair = IsReplace
12877 ? DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, ResultOps)
12878 : DAG.getMergeValues(ResultOps, DL);
12879 return std::make_pair(pair, SDValue());
12881 // Build the FP_TO_INT*_IN_MEM
12882 SDValue Ops[] = { Chain, Value, StackSlot };
12883 SDValue FIST = DAG.getMemIntrinsicNode(Opc, DL, DAG.getVTList(MVT::Other),
12885 return std::make_pair(FIST, StackSlot);
12889 static SDValue LowerAVXExtend(SDValue Op, SelectionDAG &DAG,
12890 const X86Subtarget *Subtarget) {
12891 MVT VT = Op->getSimpleValueType(0);
12892 SDValue In = Op->getOperand(0);
12893 MVT InVT = In.getSimpleValueType();
12896 if (VT.is512BitVector() || InVT.getScalarType() == MVT::i1)
12897 return DAG.getNode(ISD::ZERO_EXTEND, dl, VT, In);
12899 // Optimize vectors in AVX mode:
12902 // Use vpunpcklwd for 4 lower elements v8i16 -> v4i32.
12903 // Use vpunpckhwd for 4 upper elements v8i16 -> v4i32.
12904 // Concat upper and lower parts.
12907 // Use vpunpckldq for 4 lower elements v4i32 -> v2i64.
12908 // Use vpunpckhdq for 4 upper elements v4i32 -> v2i64.
12909 // Concat upper and lower parts.
12912 if (((VT != MVT::v16i16) || (InVT != MVT::v16i8)) &&
12913 ((VT != MVT::v8i32) || (InVT != MVT::v8i16)) &&
12914 ((VT != MVT::v4i64) || (InVT != MVT::v4i32)))
12917 if (Subtarget->hasInt256())
12918 return DAG.getNode(X86ISD::VZEXT, dl, VT, In);
12920 SDValue ZeroVec = getZeroVector(InVT, Subtarget, DAG, dl);
12921 SDValue Undef = DAG.getUNDEF(InVT);
12922 bool NeedZero = Op.getOpcode() == ISD::ZERO_EXTEND;
12923 SDValue OpLo = getUnpackl(DAG, dl, InVT, In, NeedZero ? ZeroVec : Undef);
12924 SDValue OpHi = getUnpackh(DAG, dl, InVT, In, NeedZero ? ZeroVec : Undef);
12926 MVT HVT = MVT::getVectorVT(VT.getVectorElementType(),
12927 VT.getVectorNumElements()/2);
12929 OpLo = DAG.getBitcast(HVT, OpLo);
12930 OpHi = DAG.getBitcast(HVT, OpHi);
12932 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
12935 static SDValue LowerZERO_EXTEND_AVX512(SDValue Op,
12936 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
12937 MVT VT = Op->getSimpleValueType(0);
12938 SDValue In = Op->getOperand(0);
12939 MVT InVT = In.getSimpleValueType();
12941 unsigned int NumElts = VT.getVectorNumElements();
12942 if (NumElts != 8 && NumElts != 16 && !Subtarget->hasBWI())
12945 if (VT.is512BitVector() && InVT.getVectorElementType() != MVT::i1)
12946 return DAG.getNode(X86ISD::VZEXT, DL, VT, In);
12948 assert(InVT.getVectorElementType() == MVT::i1);
12949 MVT ExtVT = NumElts == 8 ? MVT::v8i64 : MVT::v16i32;
12951 DAG.getConstant(APInt(ExtVT.getScalarSizeInBits(), 1), DL, ExtVT);
12953 DAG.getConstant(APInt::getNullValue(ExtVT.getScalarSizeInBits()), DL, ExtVT);
12955 SDValue V = DAG.getNode(ISD::VSELECT, DL, ExtVT, In, One, Zero);
12956 if (VT.is512BitVector())
12958 return DAG.getNode(X86ISD::VTRUNC, DL, VT, V);
12961 static SDValue LowerANY_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
12962 SelectionDAG &DAG) {
12963 if (Subtarget->hasFp256())
12964 if (SDValue Res = LowerAVXExtend(Op, DAG, Subtarget))
12970 static SDValue LowerZERO_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
12971 SelectionDAG &DAG) {
12973 MVT VT = Op.getSimpleValueType();
12974 SDValue In = Op.getOperand(0);
12975 MVT SVT = In.getSimpleValueType();
12977 if (VT.is512BitVector() || SVT.getVectorElementType() == MVT::i1)
12978 return LowerZERO_EXTEND_AVX512(Op, Subtarget, DAG);
12980 if (Subtarget->hasFp256())
12981 if (SDValue Res = LowerAVXExtend(Op, DAG, Subtarget))
12984 assert(!VT.is256BitVector() || !SVT.is128BitVector() ||
12985 VT.getVectorNumElements() != SVT.getVectorNumElements());
12989 SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const {
12991 MVT VT = Op.getSimpleValueType();
12992 SDValue In = Op.getOperand(0);
12993 MVT InVT = In.getSimpleValueType();
12995 if (VT == MVT::i1) {
12996 assert((InVT.isInteger() && (InVT.getSizeInBits() <= 64)) &&
12997 "Invalid scalar TRUNCATE operation");
12998 if (InVT.getSizeInBits() >= 32)
13000 In = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i32, In);
13001 return DAG.getNode(ISD::TRUNCATE, DL, VT, In);
13003 assert(VT.getVectorNumElements() == InVT.getVectorNumElements() &&
13004 "Invalid TRUNCATE operation");
13006 // move vector to mask - truncate solution for SKX
13007 if (VT.getVectorElementType() == MVT::i1) {
13008 if (InVT.is512BitVector() && InVT.getScalarSizeInBits() <= 16 &&
13009 Subtarget->hasBWI())
13010 return Op; // legal, will go to VPMOVB2M, VPMOVW2M
13011 if ((InVT.is256BitVector() || InVT.is128BitVector())
13012 && InVT.getScalarSizeInBits() <= 16 &&
13013 Subtarget->hasBWI() && Subtarget->hasVLX())
13014 return Op; // legal, will go to VPMOVB2M, VPMOVW2M
13015 if (InVT.is512BitVector() && InVT.getScalarSizeInBits() >= 32 &&
13016 Subtarget->hasDQI())
13017 return Op; // legal, will go to VPMOVD2M, VPMOVQ2M
13018 if ((InVT.is256BitVector() || InVT.is128BitVector())
13019 && InVT.getScalarSizeInBits() >= 32 &&
13020 Subtarget->hasDQI() && Subtarget->hasVLX())
13021 return Op; // legal, will go to VPMOVB2M, VPMOVQ2M
13024 if (VT.getVectorElementType() == MVT::i1) {
13025 assert(VT.getVectorElementType() == MVT::i1 && "Unexpected vector type");
13026 unsigned NumElts = InVT.getVectorNumElements();
13027 assert ((NumElts == 8 || NumElts == 16) && "Unexpected vector type");
13028 if (InVT.getSizeInBits() < 512) {
13029 MVT ExtVT = (NumElts == 16)? MVT::v16i32 : MVT::v8i64;
13030 In = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, In);
13035 DAG.getConstant(APInt::getSignBit(InVT.getScalarSizeInBits()), DL, InVT);
13036 SDValue And = DAG.getNode(ISD::AND, DL, InVT, OneV, In);
13037 return DAG.getNode(X86ISD::TESTM, DL, VT, And, And);
13040 // vpmovqb/w/d, vpmovdb/w, vpmovwb
13041 if (((!InVT.is512BitVector() && Subtarget->hasVLX()) || InVT.is512BitVector()) &&
13042 (InVT.getVectorElementType() != MVT::i16 || Subtarget->hasBWI()))
13043 return DAG.getNode(X86ISD::VTRUNC, DL, VT, In);
13045 if ((VT == MVT::v4i32) && (InVT == MVT::v4i64)) {
13046 // On AVX2, v4i64 -> v4i32 becomes VPERMD.
13047 if (Subtarget->hasInt256()) {
13048 static const int ShufMask[] = {0, 2, 4, 6, -1, -1, -1, -1};
13049 In = DAG.getBitcast(MVT::v8i32, In);
13050 In = DAG.getVectorShuffle(MVT::v8i32, DL, In, DAG.getUNDEF(MVT::v8i32),
13052 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, In,
13053 DAG.getIntPtrConstant(0, DL));
13056 SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13057 DAG.getIntPtrConstant(0, DL));
13058 SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13059 DAG.getIntPtrConstant(2, DL));
13060 OpLo = DAG.getBitcast(MVT::v4i32, OpLo);
13061 OpHi = DAG.getBitcast(MVT::v4i32, OpHi);
13062 static const int ShufMask[] = {0, 2, 4, 6};
13063 return DAG.getVectorShuffle(VT, DL, OpLo, OpHi, ShufMask);
13066 if ((VT == MVT::v8i16) && (InVT == MVT::v8i32)) {
13067 // On AVX2, v8i32 -> v8i16 becomed PSHUFB.
13068 if (Subtarget->hasInt256()) {
13069 In = DAG.getBitcast(MVT::v32i8, In);
13071 SmallVector<SDValue,32> pshufbMask;
13072 for (unsigned i = 0; i < 2; ++i) {
13073 pshufbMask.push_back(DAG.getConstant(0x0, DL, MVT::i8));
13074 pshufbMask.push_back(DAG.getConstant(0x1, DL, MVT::i8));
13075 pshufbMask.push_back(DAG.getConstant(0x4, DL, MVT::i8));
13076 pshufbMask.push_back(DAG.getConstant(0x5, DL, MVT::i8));
13077 pshufbMask.push_back(DAG.getConstant(0x8, DL, MVT::i8));
13078 pshufbMask.push_back(DAG.getConstant(0x9, DL, MVT::i8));
13079 pshufbMask.push_back(DAG.getConstant(0xc, DL, MVT::i8));
13080 pshufbMask.push_back(DAG.getConstant(0xd, DL, MVT::i8));
13081 for (unsigned j = 0; j < 8; ++j)
13082 pshufbMask.push_back(DAG.getConstant(0x80, DL, MVT::i8));
13084 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v32i8, pshufbMask);
13085 In = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v32i8, In, BV);
13086 In = DAG.getBitcast(MVT::v4i64, In);
13088 static const int ShufMask[] = {0, 2, -1, -1};
13089 In = DAG.getVectorShuffle(MVT::v4i64, DL, In, DAG.getUNDEF(MVT::v4i64),
13091 In = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13092 DAG.getIntPtrConstant(0, DL));
13093 return DAG.getBitcast(VT, In);
13096 SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v4i32, In,
13097 DAG.getIntPtrConstant(0, DL));
13099 SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v4i32, In,
13100 DAG.getIntPtrConstant(4, DL));
13102 OpLo = DAG.getBitcast(MVT::v16i8, OpLo);
13103 OpHi = DAG.getBitcast(MVT::v16i8, OpHi);
13105 // The PSHUFB mask:
13106 static const int ShufMask1[] = {0, 1, 4, 5, 8, 9, 12, 13,
13107 -1, -1, -1, -1, -1, -1, -1, -1};
13109 SDValue Undef = DAG.getUNDEF(MVT::v16i8);
13110 OpLo = DAG.getVectorShuffle(MVT::v16i8, DL, OpLo, Undef, ShufMask1);
13111 OpHi = DAG.getVectorShuffle(MVT::v16i8, DL, OpHi, Undef, ShufMask1);
13113 OpLo = DAG.getBitcast(MVT::v4i32, OpLo);
13114 OpHi = DAG.getBitcast(MVT::v4i32, OpHi);
13116 // The MOVLHPS Mask:
13117 static const int ShufMask2[] = {0, 1, 4, 5};
13118 SDValue res = DAG.getVectorShuffle(MVT::v4i32, DL, OpLo, OpHi, ShufMask2);
13119 return DAG.getBitcast(MVT::v8i16, res);
13122 // Handle truncation of V256 to V128 using shuffles.
13123 if (!VT.is128BitVector() || !InVT.is256BitVector())
13126 assert(Subtarget->hasFp256() && "256-bit vector without AVX!");
13128 unsigned NumElems = VT.getVectorNumElements();
13129 MVT NVT = MVT::getVectorVT(VT.getVectorElementType(), NumElems * 2);
13131 SmallVector<int, 16> MaskVec(NumElems * 2, -1);
13132 // Prepare truncation shuffle mask
13133 for (unsigned i = 0; i != NumElems; ++i)
13134 MaskVec[i] = i * 2;
13135 SDValue V = DAG.getVectorShuffle(NVT, DL, DAG.getBitcast(NVT, In),
13136 DAG.getUNDEF(NVT), &MaskVec[0]);
13137 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, V,
13138 DAG.getIntPtrConstant(0, DL));
13141 SDValue X86TargetLowering::LowerFP_TO_SINT(SDValue Op,
13142 SelectionDAG &DAG) const {
13143 assert(!Op.getSimpleValueType().isVector());
13145 std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
13146 /*IsSigned=*/ true, /*IsReplace=*/ false);
13147 SDValue FIST = Vals.first, StackSlot = Vals.second;
13148 // If FP_TO_INTHelper failed, the node is actually supposed to be Legal.
13149 if (!FIST.getNode())
13152 if (StackSlot.getNode())
13153 // Load the result.
13154 return DAG.getLoad(Op.getValueType(), SDLoc(Op),
13155 FIST, StackSlot, MachinePointerInfo(),
13156 false, false, false, 0);
13158 // The node is the result.
13162 SDValue X86TargetLowering::LowerFP_TO_UINT(SDValue Op,
13163 SelectionDAG &DAG) const {
13164 std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
13165 /*IsSigned=*/ false, /*IsReplace=*/ false);
13166 SDValue FIST = Vals.first, StackSlot = Vals.second;
13167 // If FP_TO_INTHelper failed, the node is actually supposed to be Legal.
13168 if (!FIST.getNode())
13171 if (StackSlot.getNode())
13172 // Load the result.
13173 return DAG.getLoad(Op.getValueType(), SDLoc(Op),
13174 FIST, StackSlot, MachinePointerInfo(),
13175 false, false, false, 0);
13177 // The node is the result.
13181 static SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) {
13183 MVT VT = Op.getSimpleValueType();
13184 SDValue In = Op.getOperand(0);
13185 MVT SVT = In.getSimpleValueType();
13187 assert(SVT == MVT::v2f32 && "Only customize MVT::v2f32 type legalization!");
13189 return DAG.getNode(X86ISD::VFPEXT, DL, VT,
13190 DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v4f32,
13191 In, DAG.getUNDEF(SVT)));
13194 /// The only differences between FABS and FNEG are the mask and the logic op.
13195 /// FNEG also has a folding opportunity for FNEG(FABS(x)).
13196 static SDValue LowerFABSorFNEG(SDValue Op, SelectionDAG &DAG) {
13197 assert((Op.getOpcode() == ISD::FABS || Op.getOpcode() == ISD::FNEG) &&
13198 "Wrong opcode for lowering FABS or FNEG.");
13200 bool IsFABS = (Op.getOpcode() == ISD::FABS);
13202 // If this is a FABS and it has an FNEG user, bail out to fold the combination
13203 // into an FNABS. We'll lower the FABS after that if it is still in use.
13205 for (SDNode *User : Op->uses())
13206 if (User->getOpcode() == ISD::FNEG)
13210 MVT VT = Op.getSimpleValueType();
13212 // FIXME: Use function attribute "OptimizeForSize" and/or CodeGenOpt::Level to
13213 // decide if we should generate a 16-byte constant mask when we only need 4 or
13214 // 8 bytes for the scalar case.
13220 if (VT.isVector()) {
13222 EltVT = VT.getVectorElementType();
13223 NumElts = VT.getVectorNumElements();
13225 // There are no scalar bitwise logical SSE/AVX instructions, so we
13226 // generate a 16-byte vector constant and logic op even for the scalar case.
13227 // Using a 16-byte mask allows folding the load of the mask with
13228 // the logic op, so it can save (~4 bytes) on code size.
13229 LogicVT = (VT == MVT::f64) ? MVT::v2f64 : MVT::v4f32;
13231 NumElts = (VT == MVT::f64) ? 2 : 4;
13234 unsigned EltBits = EltVT.getSizeInBits();
13235 LLVMContext *Context = DAG.getContext();
13236 // For FABS, mask is 0x7f...; for FNEG, mask is 0x80...
13238 IsFABS ? APInt::getSignedMaxValue(EltBits) : APInt::getSignBit(EltBits);
13239 Constant *C = ConstantInt::get(*Context, MaskElt);
13240 C = ConstantVector::getSplat(NumElts, C);
13241 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13242 SDValue CPIdx = DAG.getConstantPool(C, TLI.getPointerTy(DAG.getDataLayout()));
13243 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
13245 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13246 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13247 false, false, false, Alignment);
13249 SDValue Op0 = Op.getOperand(0);
13250 bool IsFNABS = !IsFABS && (Op0.getOpcode() == ISD::FABS);
13252 IsFABS ? X86ISD::FAND : IsFNABS ? X86ISD::FOR : X86ISD::FXOR;
13253 SDValue Operand = IsFNABS ? Op0.getOperand(0) : Op0;
13256 return DAG.getNode(LogicOp, dl, LogicVT, Operand, Mask);
13258 // For the scalar case extend to a 128-bit vector, perform the logic op,
13259 // and extract the scalar result back out.
13260 Operand = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Operand);
13261 SDValue LogicNode = DAG.getNode(LogicOp, dl, LogicVT, Operand, Mask);
13262 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, LogicNode,
13263 DAG.getIntPtrConstant(0, dl));
13266 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
13267 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13268 LLVMContext *Context = DAG.getContext();
13269 SDValue Op0 = Op.getOperand(0);
13270 SDValue Op1 = Op.getOperand(1);
13272 MVT VT = Op.getSimpleValueType();
13273 MVT SrcVT = Op1.getSimpleValueType();
13275 // If second operand is smaller, extend it first.
13276 if (SrcVT.bitsLT(VT)) {
13277 Op1 = DAG.getNode(ISD::FP_EXTEND, dl, VT, Op1);
13280 // And if it is bigger, shrink it first.
13281 if (SrcVT.bitsGT(VT)) {
13282 Op1 = DAG.getNode(ISD::FP_ROUND, dl, VT, Op1, DAG.getIntPtrConstant(1, dl));
13286 // At this point the operands and the result should have the same
13287 // type, and that won't be f80 since that is not custom lowered.
13289 const fltSemantics &Sem =
13290 VT == MVT::f64 ? APFloat::IEEEdouble : APFloat::IEEEsingle;
13291 const unsigned SizeInBits = VT.getSizeInBits();
13293 SmallVector<Constant *, 4> CV(
13294 VT == MVT::f64 ? 2 : 4,
13295 ConstantFP::get(*Context, APFloat(Sem, APInt(SizeInBits, 0))));
13297 // First, clear all bits but the sign bit from the second operand (sign).
13298 CV[0] = ConstantFP::get(*Context,
13299 APFloat(Sem, APInt::getHighBitsSet(SizeInBits, 1)));
13300 Constant *C = ConstantVector::get(CV);
13301 auto PtrVT = TLI.getPointerTy(DAG.getDataLayout());
13302 SDValue CPIdx = DAG.getConstantPool(C, PtrVT, 16);
13304 // Perform all logic operations as 16-byte vectors because there are no
13305 // scalar FP logic instructions in SSE. This allows load folding of the
13306 // constants into the logic instructions.
13307 MVT LogicVT = (VT == MVT::f64) ? MVT::v2f64 : MVT::v4f32;
13309 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13310 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13311 false, false, false, 16);
13312 Op1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Op1);
13313 SDValue SignBit = DAG.getNode(X86ISD::FAND, dl, LogicVT, Op1, Mask1);
13315 // Next, clear the sign bit from the first operand (magnitude).
13316 // If it's a constant, we can clear it here.
13317 if (ConstantFPSDNode *Op0CN = dyn_cast<ConstantFPSDNode>(Op0)) {
13318 APFloat APF = Op0CN->getValueAPF();
13319 // If the magnitude is a positive zero, the sign bit alone is enough.
13320 if (APF.isPosZero())
13321 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SrcVT, SignBit,
13322 DAG.getIntPtrConstant(0, dl));
13324 CV[0] = ConstantFP::get(*Context, APF);
13326 CV[0] = ConstantFP::get(
13328 APFloat(Sem, APInt::getLowBitsSet(SizeInBits, SizeInBits - 1)));
13330 C = ConstantVector::get(CV);
13331 CPIdx = DAG.getConstantPool(C, PtrVT, 16);
13333 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13334 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13335 false, false, false, 16);
13336 // If the magnitude operand wasn't a constant, we need to AND out the sign.
13337 if (!isa<ConstantFPSDNode>(Op0)) {
13338 Op0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Op0);
13339 Val = DAG.getNode(X86ISD::FAND, dl, LogicVT, Op0, Val);
13341 // OR the magnitude value with the sign bit.
13342 Val = DAG.getNode(X86ISD::FOR, dl, LogicVT, Val, SignBit);
13343 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SrcVT, Val,
13344 DAG.getIntPtrConstant(0, dl));
13347 static SDValue LowerFGETSIGN(SDValue Op, SelectionDAG &DAG) {
13348 SDValue N0 = Op.getOperand(0);
13350 MVT VT = Op.getSimpleValueType();
13352 // Lower ISD::FGETSIGN to (AND (X86ISD::FGETSIGNx86 ...) 1).
13353 SDValue xFGETSIGN = DAG.getNode(X86ISD::FGETSIGNx86, dl, VT, N0,
13354 DAG.getConstant(1, dl, VT));
13355 return DAG.getNode(ISD::AND, dl, VT, xFGETSIGN, DAG.getConstant(1, dl, VT));
13358 // Check whether an OR'd tree is PTEST-able.
13359 static SDValue LowerVectorAllZeroTest(SDValue Op, const X86Subtarget *Subtarget,
13360 SelectionDAG &DAG) {
13361 assert(Op.getOpcode() == ISD::OR && "Only check OR'd tree.");
13363 if (!Subtarget->hasSSE41())
13366 if (!Op->hasOneUse())
13369 SDNode *N = Op.getNode();
13372 SmallVector<SDValue, 8> Opnds;
13373 DenseMap<SDValue, unsigned> VecInMap;
13374 SmallVector<SDValue, 8> VecIns;
13375 EVT VT = MVT::Other;
13377 // Recognize a special case where a vector is casted into wide integer to
13379 Opnds.push_back(N->getOperand(0));
13380 Opnds.push_back(N->getOperand(1));
13382 for (unsigned Slot = 0, e = Opnds.size(); Slot < e; ++Slot) {
13383 SmallVectorImpl<SDValue>::const_iterator I = Opnds.begin() + Slot;
13384 // BFS traverse all OR'd operands.
13385 if (I->getOpcode() == ISD::OR) {
13386 Opnds.push_back(I->getOperand(0));
13387 Opnds.push_back(I->getOperand(1));
13388 // Re-evaluate the number of nodes to be traversed.
13389 e += 2; // 2 more nodes (LHS and RHS) are pushed.
13393 // Quit if a non-EXTRACT_VECTOR_ELT
13394 if (I->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
13397 // Quit if without a constant index.
13398 SDValue Idx = I->getOperand(1);
13399 if (!isa<ConstantSDNode>(Idx))
13402 SDValue ExtractedFromVec = I->getOperand(0);
13403 DenseMap<SDValue, unsigned>::iterator M = VecInMap.find(ExtractedFromVec);
13404 if (M == VecInMap.end()) {
13405 VT = ExtractedFromVec.getValueType();
13406 // Quit if not 128/256-bit vector.
13407 if (!VT.is128BitVector() && !VT.is256BitVector())
13409 // Quit if not the same type.
13410 if (VecInMap.begin() != VecInMap.end() &&
13411 VT != VecInMap.begin()->first.getValueType())
13413 M = VecInMap.insert(std::make_pair(ExtractedFromVec, 0)).first;
13414 VecIns.push_back(ExtractedFromVec);
13416 M->second |= 1U << cast<ConstantSDNode>(Idx)->getZExtValue();
13419 assert((VT.is128BitVector() || VT.is256BitVector()) &&
13420 "Not extracted from 128-/256-bit vector.");
13422 unsigned FullMask = (1U << VT.getVectorNumElements()) - 1U;
13424 for (DenseMap<SDValue, unsigned>::const_iterator
13425 I = VecInMap.begin(), E = VecInMap.end(); I != E; ++I) {
13426 // Quit if not all elements are used.
13427 if (I->second != FullMask)
13431 EVT TestVT = VT.is128BitVector() ? MVT::v2i64 : MVT::v4i64;
13433 // Cast all vectors into TestVT for PTEST.
13434 for (unsigned i = 0, e = VecIns.size(); i < e; ++i)
13435 VecIns[i] = DAG.getBitcast(TestVT, VecIns[i]);
13437 // If more than one full vectors are evaluated, OR them first before PTEST.
13438 for (unsigned Slot = 0, e = VecIns.size(); e - Slot > 1; Slot += 2, e += 1) {
13439 // Each iteration will OR 2 nodes and append the result until there is only
13440 // 1 node left, i.e. the final OR'd value of all vectors.
13441 SDValue LHS = VecIns[Slot];
13442 SDValue RHS = VecIns[Slot + 1];
13443 VecIns.push_back(DAG.getNode(ISD::OR, DL, TestVT, LHS, RHS));
13446 return DAG.getNode(X86ISD::PTEST, DL, MVT::i32,
13447 VecIns.back(), VecIns.back());
13450 /// \brief return true if \c Op has a use that doesn't just read flags.
13451 static bool hasNonFlagsUse(SDValue Op) {
13452 for (SDNode::use_iterator UI = Op->use_begin(), UE = Op->use_end(); UI != UE;
13454 SDNode *User = *UI;
13455 unsigned UOpNo = UI.getOperandNo();
13456 if (User->getOpcode() == ISD::TRUNCATE && User->hasOneUse()) {
13457 // Look pass truncate.
13458 UOpNo = User->use_begin().getOperandNo();
13459 User = *User->use_begin();
13462 if (User->getOpcode() != ISD::BRCOND && User->getOpcode() != ISD::SETCC &&
13463 !(User->getOpcode() == ISD::SELECT && UOpNo == 0))
13469 /// Emit nodes that will be selected as "test Op0,Op0", or something
13471 SDValue X86TargetLowering::EmitTest(SDValue Op, unsigned X86CC, SDLoc dl,
13472 SelectionDAG &DAG) const {
13473 if (Op.getValueType() == MVT::i1) {
13474 SDValue ExtOp = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i8, Op);
13475 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, ExtOp,
13476 DAG.getConstant(0, dl, MVT::i8));
13478 // CF and OF aren't always set the way we want. Determine which
13479 // of these we need.
13480 bool NeedCF = false;
13481 bool NeedOF = false;
13484 case X86::COND_A: case X86::COND_AE:
13485 case X86::COND_B: case X86::COND_BE:
13488 case X86::COND_G: case X86::COND_GE:
13489 case X86::COND_L: case X86::COND_LE:
13490 case X86::COND_O: case X86::COND_NO: {
13491 // Check if we really need to set the
13492 // Overflow flag. If NoSignedWrap is present
13493 // that is not actually needed.
13494 switch (Op->getOpcode()) {
13499 const auto *BinNode = cast<BinaryWithFlagsSDNode>(Op.getNode());
13500 if (BinNode->Flags.hasNoSignedWrap())
13510 // See if we can use the EFLAGS value from the operand instead of
13511 // doing a separate TEST. TEST always sets OF and CF to 0, so unless
13512 // we prove that the arithmetic won't overflow, we can't use OF or CF.
13513 if (Op.getResNo() != 0 || NeedOF || NeedCF) {
13514 // Emit a CMP with 0, which is the TEST pattern.
13515 //if (Op.getValueType() == MVT::i1)
13516 // return DAG.getNode(X86ISD::CMP, dl, MVT::i1, Op,
13517 // DAG.getConstant(0, MVT::i1));
13518 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
13519 DAG.getConstant(0, dl, Op.getValueType()));
13521 unsigned Opcode = 0;
13522 unsigned NumOperands = 0;
13524 // Truncate operations may prevent the merge of the SETCC instruction
13525 // and the arithmetic instruction before it. Attempt to truncate the operands
13526 // of the arithmetic instruction and use a reduced bit-width instruction.
13527 bool NeedTruncation = false;
13528 SDValue ArithOp = Op;
13529 if (Op->getOpcode() == ISD::TRUNCATE && Op->hasOneUse()) {
13530 SDValue Arith = Op->getOperand(0);
13531 // Both the trunc and the arithmetic op need to have one user each.
13532 if (Arith->hasOneUse())
13533 switch (Arith.getOpcode()) {
13540 NeedTruncation = true;
13546 // NOTICE: In the code below we use ArithOp to hold the arithmetic operation
13547 // which may be the result of a CAST. We use the variable 'Op', which is the
13548 // non-casted variable when we check for possible users.
13549 switch (ArithOp.getOpcode()) {
13551 // Due to an isel shortcoming, be conservative if this add is likely to be
13552 // selected as part of a load-modify-store instruction. When the root node
13553 // in a match is a store, isel doesn't know how to remap non-chain non-flag
13554 // uses of other nodes in the match, such as the ADD in this case. This
13555 // leads to the ADD being left around and reselected, with the result being
13556 // two adds in the output. Alas, even if none our users are stores, that
13557 // doesn't prove we're O.K. Ergo, if we have any parents that aren't
13558 // CopyToReg or SETCC, eschew INC/DEC. A better fix seems to require
13559 // climbing the DAG back to the root, and it doesn't seem to be worth the
13561 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
13562 UE = Op.getNode()->use_end(); UI != UE; ++UI)
13563 if (UI->getOpcode() != ISD::CopyToReg &&
13564 UI->getOpcode() != ISD::SETCC &&
13565 UI->getOpcode() != ISD::STORE)
13568 if (ConstantSDNode *C =
13569 dyn_cast<ConstantSDNode>(ArithOp.getNode()->getOperand(1))) {
13570 // An add of one will be selected as an INC.
13571 if (C->getAPIntValue() == 1 && !Subtarget->slowIncDec()) {
13572 Opcode = X86ISD::INC;
13577 // An add of negative one (subtract of one) will be selected as a DEC.
13578 if (C->getAPIntValue().isAllOnesValue() && !Subtarget->slowIncDec()) {
13579 Opcode = X86ISD::DEC;
13585 // Otherwise use a regular EFLAGS-setting add.
13586 Opcode = X86ISD::ADD;
13591 // If we have a constant logical shift that's only used in a comparison
13592 // against zero turn it into an equivalent AND. This allows turning it into
13593 // a TEST instruction later.
13594 if ((X86CC == X86::COND_E || X86CC == X86::COND_NE) && Op->hasOneUse() &&
13595 isa<ConstantSDNode>(Op->getOperand(1)) && !hasNonFlagsUse(Op)) {
13596 EVT VT = Op.getValueType();
13597 unsigned BitWidth = VT.getSizeInBits();
13598 unsigned ShAmt = Op->getConstantOperandVal(1);
13599 if (ShAmt >= BitWidth) // Avoid undefined shifts.
13601 APInt Mask = ArithOp.getOpcode() == ISD::SRL
13602 ? APInt::getHighBitsSet(BitWidth, BitWidth - ShAmt)
13603 : APInt::getLowBitsSet(BitWidth, BitWidth - ShAmt);
13604 if (!Mask.isSignedIntN(32)) // Avoid large immediates.
13606 SDValue New = DAG.getNode(ISD::AND, dl, VT, Op->getOperand(0),
13607 DAG.getConstant(Mask, dl, VT));
13608 DAG.ReplaceAllUsesWith(Op, New);
13614 // If the primary and result isn't used, don't bother using X86ISD::AND,
13615 // because a TEST instruction will be better.
13616 if (!hasNonFlagsUse(Op))
13622 // Due to the ISEL shortcoming noted above, be conservative if this op is
13623 // likely to be selected as part of a load-modify-store instruction.
13624 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
13625 UE = Op.getNode()->use_end(); UI != UE; ++UI)
13626 if (UI->getOpcode() == ISD::STORE)
13629 // Otherwise use a regular EFLAGS-setting instruction.
13630 switch (ArithOp.getOpcode()) {
13631 default: llvm_unreachable("unexpected operator!");
13632 case ISD::SUB: Opcode = X86ISD::SUB; break;
13633 case ISD::XOR: Opcode = X86ISD::XOR; break;
13634 case ISD::AND: Opcode = X86ISD::AND; break;
13636 if (!NeedTruncation && (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
13637 SDValue EFLAGS = LowerVectorAllZeroTest(Op, Subtarget, DAG);
13638 if (EFLAGS.getNode())
13641 Opcode = X86ISD::OR;
13655 return SDValue(Op.getNode(), 1);
13661 // If we found that truncation is beneficial, perform the truncation and
13663 if (NeedTruncation) {
13664 EVT VT = Op.getValueType();
13665 SDValue WideVal = Op->getOperand(0);
13666 EVT WideVT = WideVal.getValueType();
13667 unsigned ConvertedOp = 0;
13668 // Use a target machine opcode to prevent further DAGCombine
13669 // optimizations that may separate the arithmetic operations
13670 // from the setcc node.
13671 switch (WideVal.getOpcode()) {
13673 case ISD::ADD: ConvertedOp = X86ISD::ADD; break;
13674 case ISD::SUB: ConvertedOp = X86ISD::SUB; break;
13675 case ISD::AND: ConvertedOp = X86ISD::AND; break;
13676 case ISD::OR: ConvertedOp = X86ISD::OR; break;
13677 case ISD::XOR: ConvertedOp = X86ISD::XOR; break;
13681 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13682 if (TLI.isOperationLegal(WideVal.getOpcode(), WideVT)) {
13683 SDValue V0 = DAG.getNode(ISD::TRUNCATE, dl, VT, WideVal.getOperand(0));
13684 SDValue V1 = DAG.getNode(ISD::TRUNCATE, dl, VT, WideVal.getOperand(1));
13685 Op = DAG.getNode(ConvertedOp, dl, VT, V0, V1);
13691 // Emit a CMP with 0, which is the TEST pattern.
13692 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
13693 DAG.getConstant(0, dl, Op.getValueType()));
13695 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
13696 SmallVector<SDValue, 4> Ops(Op->op_begin(), Op->op_begin() + NumOperands);
13698 SDValue New = DAG.getNode(Opcode, dl, VTs, Ops);
13699 DAG.ReplaceAllUsesWith(Op, New);
13700 return SDValue(New.getNode(), 1);
13703 /// Emit nodes that will be selected as "cmp Op0,Op1", or something
13705 SDValue X86TargetLowering::EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
13706 SDLoc dl, SelectionDAG &DAG) const {
13707 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op1)) {
13708 if (C->getAPIntValue() == 0)
13709 return EmitTest(Op0, X86CC, dl, DAG);
13711 if (Op0.getValueType() == MVT::i1)
13712 llvm_unreachable("Unexpected comparison operation for MVT::i1 operands");
13715 if ((Op0.getValueType() == MVT::i8 || Op0.getValueType() == MVT::i16 ||
13716 Op0.getValueType() == MVT::i32 || Op0.getValueType() == MVT::i64)) {
13717 // Do the comparison at i32 if it's smaller, besides the Atom case.
13718 // This avoids subregister aliasing issues. Keep the smaller reference
13719 // if we're optimizing for size, however, as that'll allow better folding
13720 // of memory operations.
13721 if (Op0.getValueType() != MVT::i32 && Op0.getValueType() != MVT::i64 &&
13722 !DAG.getMachineFunction().getFunction()->optForMinSize() &&
13723 !Subtarget->isAtom()) {
13724 unsigned ExtendOp =
13725 isX86CCUnsigned(X86CC) ? ISD::ZERO_EXTEND : ISD::SIGN_EXTEND;
13726 Op0 = DAG.getNode(ExtendOp, dl, MVT::i32, Op0);
13727 Op1 = DAG.getNode(ExtendOp, dl, MVT::i32, Op1);
13729 // Use SUB instead of CMP to enable CSE between SUB and CMP.
13730 SDVTList VTs = DAG.getVTList(Op0.getValueType(), MVT::i32);
13731 SDValue Sub = DAG.getNode(X86ISD::SUB, dl, VTs,
13733 return SDValue(Sub.getNode(), 1);
13735 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op0, Op1);
13738 /// Convert a comparison if required by the subtarget.
13739 SDValue X86TargetLowering::ConvertCmpIfNecessary(SDValue Cmp,
13740 SelectionDAG &DAG) const {
13741 // If the subtarget does not support the FUCOMI instruction, floating-point
13742 // comparisons have to be converted.
13743 if (Subtarget->hasCMov() ||
13744 Cmp.getOpcode() != X86ISD::CMP ||
13745 !Cmp.getOperand(0).getValueType().isFloatingPoint() ||
13746 !Cmp.getOperand(1).getValueType().isFloatingPoint())
13749 // The instruction selector will select an FUCOM instruction instead of
13750 // FUCOMI, which writes the comparison result to FPSW instead of EFLAGS. Hence
13751 // build an SDNode sequence that transfers the result from FPSW into EFLAGS:
13752 // (X86sahf (trunc (srl (X86fp_stsw (trunc (X86cmp ...)), 8))))
13754 SDValue TruncFPSW = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, Cmp);
13755 SDValue FNStSW = DAG.getNode(X86ISD::FNSTSW16r, dl, MVT::i16, TruncFPSW);
13756 SDValue Srl = DAG.getNode(ISD::SRL, dl, MVT::i16, FNStSW,
13757 DAG.getConstant(8, dl, MVT::i8));
13758 SDValue TruncSrl = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Srl);
13759 return DAG.getNode(X86ISD::SAHF, dl, MVT::i32, TruncSrl);
13762 /// The minimum architected relative accuracy is 2^-12. We need one
13763 /// Newton-Raphson step to have a good float result (24 bits of precision).
13764 SDValue X86TargetLowering::getRsqrtEstimate(SDValue Op,
13765 DAGCombinerInfo &DCI,
13766 unsigned &RefinementSteps,
13767 bool &UseOneConstNR) const {
13768 EVT VT = Op.getValueType();
13769 const char *RecipOp;
13771 // SSE1 has rsqrtss and rsqrtps. AVX adds a 256-bit variant for rsqrtps.
13772 // TODO: Add support for AVX512 (v16f32).
13773 // It is likely not profitable to do this for f64 because a double-precision
13774 // rsqrt estimate with refinement on x86 prior to FMA requires at least 16
13775 // instructions: convert to single, rsqrtss, convert back to double, refine
13776 // (3 steps = at least 13 insts). If an 'rsqrtsd' variant was added to the ISA
13777 // along with FMA, this could be a throughput win.
13778 if (VT == MVT::f32 && Subtarget->hasSSE1())
13780 else if ((VT == MVT::v4f32 && Subtarget->hasSSE1()) ||
13781 (VT == MVT::v8f32 && Subtarget->hasAVX()))
13782 RecipOp = "vec-sqrtf";
13786 TargetRecip Recips = DCI.DAG.getTarget().Options.Reciprocals;
13787 if (!Recips.isEnabled(RecipOp))
13790 RefinementSteps = Recips.getRefinementSteps(RecipOp);
13791 UseOneConstNR = false;
13792 return DCI.DAG.getNode(X86ISD::FRSQRT, SDLoc(Op), VT, Op);
13795 /// The minimum architected relative accuracy is 2^-12. We need one
13796 /// Newton-Raphson step to have a good float result (24 bits of precision).
13797 SDValue X86TargetLowering::getRecipEstimate(SDValue Op,
13798 DAGCombinerInfo &DCI,
13799 unsigned &RefinementSteps) const {
13800 EVT VT = Op.getValueType();
13801 const char *RecipOp;
13803 // SSE1 has rcpss and rcpps. AVX adds a 256-bit variant for rcpps.
13804 // TODO: Add support for AVX512 (v16f32).
13805 // It is likely not profitable to do this for f64 because a double-precision
13806 // reciprocal estimate with refinement on x86 prior to FMA requires
13807 // 15 instructions: convert to single, rcpss, convert back to double, refine
13808 // (3 steps = 12 insts). If an 'rcpsd' variant was added to the ISA
13809 // along with FMA, this could be a throughput win.
13810 if (VT == MVT::f32 && Subtarget->hasSSE1())
13812 else if ((VT == MVT::v4f32 && Subtarget->hasSSE1()) ||
13813 (VT == MVT::v8f32 && Subtarget->hasAVX()))
13814 RecipOp = "vec-divf";
13818 TargetRecip Recips = DCI.DAG.getTarget().Options.Reciprocals;
13819 if (!Recips.isEnabled(RecipOp))
13822 RefinementSteps = Recips.getRefinementSteps(RecipOp);
13823 return DCI.DAG.getNode(X86ISD::FRCP, SDLoc(Op), VT, Op);
13826 /// If we have at least two divisions that use the same divisor, convert to
13827 /// multplication by a reciprocal. This may need to be adjusted for a given
13828 /// CPU if a division's cost is not at least twice the cost of a multiplication.
13829 /// This is because we still need one division to calculate the reciprocal and
13830 /// then we need two multiplies by that reciprocal as replacements for the
13831 /// original divisions.
13832 unsigned X86TargetLowering::combineRepeatedFPDivisors() const {
13836 static bool isAllOnes(SDValue V) {
13837 ConstantSDNode *C = dyn_cast<ConstantSDNode>(V);
13838 return C && C->isAllOnesValue();
13841 /// LowerToBT - Result of 'and' is compared against zero. Turn it into a BT node
13842 /// if it's possible.
13843 SDValue X86TargetLowering::LowerToBT(SDValue And, ISD::CondCode CC,
13844 SDLoc dl, SelectionDAG &DAG) const {
13845 SDValue Op0 = And.getOperand(0);
13846 SDValue Op1 = And.getOperand(1);
13847 if (Op0.getOpcode() == ISD::TRUNCATE)
13848 Op0 = Op0.getOperand(0);
13849 if (Op1.getOpcode() == ISD::TRUNCATE)
13850 Op1 = Op1.getOperand(0);
13853 if (Op1.getOpcode() == ISD::SHL)
13854 std::swap(Op0, Op1);
13855 if (Op0.getOpcode() == ISD::SHL) {
13856 if (ConstantSDNode *And00C = dyn_cast<ConstantSDNode>(Op0.getOperand(0)))
13857 if (And00C->getZExtValue() == 1) {
13858 // If we looked past a truncate, check that it's only truncating away
13860 unsigned BitWidth = Op0.getValueSizeInBits();
13861 unsigned AndBitWidth = And.getValueSizeInBits();
13862 if (BitWidth > AndBitWidth) {
13864 DAG.computeKnownBits(Op0, Zeros, Ones);
13865 if (Zeros.countLeadingOnes() < BitWidth - AndBitWidth)
13869 RHS = Op0.getOperand(1);
13871 } else if (Op1.getOpcode() == ISD::Constant) {
13872 ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op1);
13873 uint64_t AndRHSVal = AndRHS->getZExtValue();
13874 SDValue AndLHS = Op0;
13876 if (AndRHSVal == 1 && AndLHS.getOpcode() == ISD::SRL) {
13877 LHS = AndLHS.getOperand(0);
13878 RHS = AndLHS.getOperand(1);
13881 // Use BT if the immediate can't be encoded in a TEST instruction.
13882 if (!isUInt<32>(AndRHSVal) && isPowerOf2_64(AndRHSVal)) {
13884 RHS = DAG.getConstant(Log2_64_Ceil(AndRHSVal), dl, LHS.getValueType());
13888 if (LHS.getNode()) {
13889 // If LHS is i8, promote it to i32 with any_extend. There is no i8 BT
13890 // instruction. Since the shift amount is in-range-or-undefined, we know
13891 // that doing a bittest on the i32 value is ok. We extend to i32 because
13892 // the encoding for the i16 version is larger than the i32 version.
13893 // Also promote i16 to i32 for performance / code size reason.
13894 if (LHS.getValueType() == MVT::i8 ||
13895 LHS.getValueType() == MVT::i16)
13896 LHS = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, LHS);
13898 // If the operand types disagree, extend the shift amount to match. Since
13899 // BT ignores high bits (like shifts) we can use anyextend.
13900 if (LHS.getValueType() != RHS.getValueType())
13901 RHS = DAG.getNode(ISD::ANY_EXTEND, dl, LHS.getValueType(), RHS);
13903 SDValue BT = DAG.getNode(X86ISD::BT, dl, MVT::i32, LHS, RHS);
13904 X86::CondCode Cond = CC == ISD::SETEQ ? X86::COND_AE : X86::COND_B;
13905 return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
13906 DAG.getConstant(Cond, dl, MVT::i8), BT);
13912 /// \brief - Turns an ISD::CondCode into a value suitable for SSE floating point
13914 static int translateX86FSETCC(ISD::CondCode SetCCOpcode, SDValue &Op0,
13919 // SSE Condition code mapping:
13928 switch (SetCCOpcode) {
13929 default: llvm_unreachable("Unexpected SETCC condition");
13931 case ISD::SETEQ: SSECC = 0; break;
13933 case ISD::SETGT: Swap = true; // Fallthrough
13935 case ISD::SETOLT: SSECC = 1; break;
13937 case ISD::SETGE: Swap = true; // Fallthrough
13939 case ISD::SETOLE: SSECC = 2; break;
13940 case ISD::SETUO: SSECC = 3; break;
13942 case ISD::SETNE: SSECC = 4; break;
13943 case ISD::SETULE: Swap = true; // Fallthrough
13944 case ISD::SETUGE: SSECC = 5; break;
13945 case ISD::SETULT: Swap = true; // Fallthrough
13946 case ISD::SETUGT: SSECC = 6; break;
13947 case ISD::SETO: SSECC = 7; break;
13949 case ISD::SETONE: SSECC = 8; break;
13952 std::swap(Op0, Op1);
13957 // Lower256IntVSETCC - Break a VSETCC 256-bit integer VSETCC into two new 128
13958 // ones, and then concatenate the result back.
13959 static SDValue Lower256IntVSETCC(SDValue Op, SelectionDAG &DAG) {
13960 MVT VT = Op.getSimpleValueType();
13962 assert(VT.is256BitVector() && Op.getOpcode() == ISD::SETCC &&
13963 "Unsupported value type for operation");
13965 unsigned NumElems = VT.getVectorNumElements();
13967 SDValue CC = Op.getOperand(2);
13969 // Extract the LHS vectors
13970 SDValue LHS = Op.getOperand(0);
13971 SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
13972 SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
13974 // Extract the RHS vectors
13975 SDValue RHS = Op.getOperand(1);
13976 SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
13977 SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
13979 // Issue the operation on the smaller types and concatenate the result back
13980 MVT EltVT = VT.getVectorElementType();
13981 MVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
13982 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
13983 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1, CC),
13984 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2, CC));
13987 static SDValue LowerBoolVSETCC_AVX512(SDValue Op, SelectionDAG &DAG) {
13988 SDValue Op0 = Op.getOperand(0);
13989 SDValue Op1 = Op.getOperand(1);
13990 SDValue CC = Op.getOperand(2);
13991 MVT VT = Op.getSimpleValueType();
13994 assert(Op0.getValueType().getVectorElementType() == MVT::i1 &&
13995 "Unexpected type for boolean compare operation");
13996 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
13997 SDValue NotOp0 = DAG.getNode(ISD::XOR, dl, VT, Op0,
13998 DAG.getConstant(-1, dl, VT));
13999 SDValue NotOp1 = DAG.getNode(ISD::XOR, dl, VT, Op1,
14000 DAG.getConstant(-1, dl, VT));
14001 switch (SetCCOpcode) {
14002 default: llvm_unreachable("Unexpected SETCC condition");
14004 // (x == y) -> ~(x ^ y)
14005 return DAG.getNode(ISD::XOR, dl, VT,
14006 DAG.getNode(ISD::XOR, dl, VT, Op0, Op1),
14007 DAG.getConstant(-1, dl, VT));
14009 // (x != y) -> (x ^ y)
14010 return DAG.getNode(ISD::XOR, dl, VT, Op0, Op1);
14013 // (x > y) -> (x & ~y)
14014 return DAG.getNode(ISD::AND, dl, VT, Op0, NotOp1);
14017 // (x < y) -> (~x & y)
14018 return DAG.getNode(ISD::AND, dl, VT, NotOp0, Op1);
14021 // (x <= y) -> (~x | y)
14022 return DAG.getNode(ISD::OR, dl, VT, NotOp0, Op1);
14025 // (x >=y) -> (x | ~y)
14026 return DAG.getNode(ISD::OR, dl, VT, Op0, NotOp1);
14030 static SDValue LowerIntVSETCC_AVX512(SDValue Op, SelectionDAG &DAG,
14031 const X86Subtarget *Subtarget) {
14032 SDValue Op0 = Op.getOperand(0);
14033 SDValue Op1 = Op.getOperand(1);
14034 SDValue CC = Op.getOperand(2);
14035 MVT VT = Op.getSimpleValueType();
14038 assert(Op0.getValueType().getVectorElementType().getSizeInBits() >= 8 &&
14039 Op.getValueType().getScalarType() == MVT::i1 &&
14040 "Cannot set masked compare for this operation");
14042 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
14044 bool Unsigned = false;
14047 switch (SetCCOpcode) {
14048 default: llvm_unreachable("Unexpected SETCC condition");
14049 case ISD::SETNE: SSECC = 4; break;
14050 case ISD::SETEQ: Opc = X86ISD::PCMPEQM; break;
14051 case ISD::SETUGT: SSECC = 6; Unsigned = true; break;
14052 case ISD::SETLT: Swap = true; //fall-through
14053 case ISD::SETGT: Opc = X86ISD::PCMPGTM; break;
14054 case ISD::SETULT: SSECC = 1; Unsigned = true; break;
14055 case ISD::SETUGE: SSECC = 5; Unsigned = true; break; //NLT
14056 case ISD::SETGE: Swap = true; SSECC = 2; break; // LE + swap
14057 case ISD::SETULE: Unsigned = true; //fall-through
14058 case ISD::SETLE: SSECC = 2; break;
14062 std::swap(Op0, Op1);
14064 return DAG.getNode(Opc, dl, VT, Op0, Op1);
14065 Opc = Unsigned ? X86ISD::CMPMU: X86ISD::CMPM;
14066 return DAG.getNode(Opc, dl, VT, Op0, Op1,
14067 DAG.getConstant(SSECC, dl, MVT::i8));
14070 /// \brief Try to turn a VSETULT into a VSETULE by modifying its second
14071 /// operand \p Op1. If non-trivial (for example because it's not constant)
14072 /// return an empty value.
14073 static SDValue ChangeVSETULTtoVSETULE(SDLoc dl, SDValue Op1, SelectionDAG &DAG)
14075 BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Op1.getNode());
14079 MVT VT = Op1.getSimpleValueType();
14080 MVT EVT = VT.getVectorElementType();
14081 unsigned n = VT.getVectorNumElements();
14082 SmallVector<SDValue, 8> ULTOp1;
14084 for (unsigned i = 0; i < n; ++i) {
14085 ConstantSDNode *Elt = dyn_cast<ConstantSDNode>(BV->getOperand(i));
14086 if (!Elt || Elt->isOpaque() || Elt->getValueType(0) != EVT)
14089 // Avoid underflow.
14090 APInt Val = Elt->getAPIntValue();
14094 ULTOp1.push_back(DAG.getConstant(Val - 1, dl, EVT));
14097 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, ULTOp1);
14100 static SDValue LowerVSETCC(SDValue Op, const X86Subtarget *Subtarget,
14101 SelectionDAG &DAG) {
14102 SDValue Op0 = Op.getOperand(0);
14103 SDValue Op1 = Op.getOperand(1);
14104 SDValue CC = Op.getOperand(2);
14105 MVT VT = Op.getSimpleValueType();
14106 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
14107 bool isFP = Op.getOperand(1).getSimpleValueType().isFloatingPoint();
14112 MVT EltVT = Op0.getSimpleValueType().getVectorElementType();
14113 assert(EltVT == MVT::f32 || EltVT == MVT::f64);
14116 unsigned SSECC = translateX86FSETCC(SetCCOpcode, Op0, Op1);
14117 unsigned Opc = X86ISD::CMPP;
14118 if (Subtarget->hasAVX512() && VT.getVectorElementType() == MVT::i1) {
14119 assert(VT.getVectorNumElements() <= 16);
14120 Opc = X86ISD::CMPM;
14122 // In the two special cases we can't handle, emit two comparisons.
14125 unsigned CombineOpc;
14126 if (SetCCOpcode == ISD::SETUEQ) {
14127 CC0 = 3; CC1 = 0; CombineOpc = ISD::OR;
14129 assert(SetCCOpcode == ISD::SETONE);
14130 CC0 = 7; CC1 = 4; CombineOpc = ISD::AND;
14133 SDValue Cmp0 = DAG.getNode(Opc, dl, VT, Op0, Op1,
14134 DAG.getConstant(CC0, dl, MVT::i8));
14135 SDValue Cmp1 = DAG.getNode(Opc, dl, VT, Op0, Op1,
14136 DAG.getConstant(CC1, dl, MVT::i8));
14137 return DAG.getNode(CombineOpc, dl, VT, Cmp0, Cmp1);
14139 // Handle all other FP comparisons here.
14140 return DAG.getNode(Opc, dl, VT, Op0, Op1,
14141 DAG.getConstant(SSECC, dl, MVT::i8));
14144 // Break 256-bit integer vector compare into smaller ones.
14145 if (VT.is256BitVector() && !Subtarget->hasInt256())
14146 return Lower256IntVSETCC(Op, DAG);
14148 EVT OpVT = Op1.getValueType();
14149 if (OpVT.getVectorElementType() == MVT::i1)
14150 return LowerBoolVSETCC_AVX512(Op, DAG);
14152 bool MaskResult = (VT.getVectorElementType() == MVT::i1);
14153 if (Subtarget->hasAVX512()) {
14154 if (Op1.getValueType().is512BitVector() ||
14155 (Subtarget->hasBWI() && Subtarget->hasVLX()) ||
14156 (MaskResult && OpVT.getVectorElementType().getSizeInBits() >= 32))
14157 return LowerIntVSETCC_AVX512(Op, DAG, Subtarget);
14159 // In AVX-512 architecture setcc returns mask with i1 elements,
14160 // But there is no compare instruction for i8 and i16 elements in KNL.
14161 // We are not talking about 512-bit operands in this case, these
14162 // types are illegal.
14164 (OpVT.getVectorElementType().getSizeInBits() < 32 &&
14165 OpVT.getVectorElementType().getSizeInBits() >= 8))
14166 return DAG.getNode(ISD::TRUNCATE, dl, VT,
14167 DAG.getNode(ISD::SETCC, dl, OpVT, Op0, Op1, CC));
14170 // We are handling one of the integer comparisons here. Since SSE only has
14171 // GT and EQ comparisons for integer, swapping operands and multiple
14172 // operations may be required for some comparisons.
14174 bool Swap = false, Invert = false, FlipSigns = false, MinMax = false;
14175 bool Subus = false;
14177 switch (SetCCOpcode) {
14178 default: llvm_unreachable("Unexpected SETCC condition");
14179 case ISD::SETNE: Invert = true;
14180 case ISD::SETEQ: Opc = X86ISD::PCMPEQ; break;
14181 case ISD::SETLT: Swap = true;
14182 case ISD::SETGT: Opc = X86ISD::PCMPGT; break;
14183 case ISD::SETGE: Swap = true;
14184 case ISD::SETLE: Opc = X86ISD::PCMPGT;
14185 Invert = true; break;
14186 case ISD::SETULT: Swap = true;
14187 case ISD::SETUGT: Opc = X86ISD::PCMPGT;
14188 FlipSigns = true; break;
14189 case ISD::SETUGE: Swap = true;
14190 case ISD::SETULE: Opc = X86ISD::PCMPGT;
14191 FlipSigns = true; Invert = true; break;
14194 // Special case: Use min/max operations for SETULE/SETUGE
14195 MVT VET = VT.getVectorElementType();
14197 (Subtarget->hasSSE41() && (VET >= MVT::i8 && VET <= MVT::i32))
14198 || (Subtarget->hasSSE2() && (VET == MVT::i8));
14201 switch (SetCCOpcode) {
14203 case ISD::SETULE: Opc = ISD::UMIN; MinMax = true; break;
14204 case ISD::SETUGE: Opc = ISD::UMAX; MinMax = true; break;
14207 if (MinMax) { Swap = false; Invert = false; FlipSigns = false; }
14210 bool hasSubus = Subtarget->hasSSE2() && (VET == MVT::i8 || VET == MVT::i16);
14211 if (!MinMax && hasSubus) {
14212 // As another special case, use PSUBUS[BW] when it's profitable. E.g. for
14214 // t = psubus Op0, Op1
14215 // pcmpeq t, <0..0>
14216 switch (SetCCOpcode) {
14218 case ISD::SETULT: {
14219 // If the comparison is against a constant we can turn this into a
14220 // setule. With psubus, setule does not require a swap. This is
14221 // beneficial because the constant in the register is no longer
14222 // destructed as the destination so it can be hoisted out of a loop.
14223 // Only do this pre-AVX since vpcmp* is no longer destructive.
14224 if (Subtarget->hasAVX())
14226 SDValue ULEOp1 = ChangeVSETULTtoVSETULE(dl, Op1, DAG);
14227 if (ULEOp1.getNode()) {
14229 Subus = true; Invert = false; Swap = false;
14233 // Psubus is better than flip-sign because it requires no inversion.
14234 case ISD::SETUGE: Subus = true; Invert = false; Swap = true; break;
14235 case ISD::SETULE: Subus = true; Invert = false; Swap = false; break;
14239 Opc = X86ISD::SUBUS;
14245 std::swap(Op0, Op1);
14247 // Check that the operation in question is available (most are plain SSE2,
14248 // but PCMPGTQ and PCMPEQQ have different requirements).
14249 if (VT == MVT::v2i64) {
14250 if (Opc == X86ISD::PCMPGT && !Subtarget->hasSSE42()) {
14251 assert(Subtarget->hasSSE2() && "Don't know how to lower!");
14253 // First cast everything to the right type.
14254 Op0 = DAG.getBitcast(MVT::v4i32, Op0);
14255 Op1 = DAG.getBitcast(MVT::v4i32, Op1);
14257 // Since SSE has no unsigned integer comparisons, we need to flip the sign
14258 // bits of the inputs before performing those operations. The lower
14259 // compare is always unsigned.
14262 SB = DAG.getConstant(0x80000000U, dl, MVT::v4i32);
14264 SDValue Sign = DAG.getConstant(0x80000000U, dl, MVT::i32);
14265 SDValue Zero = DAG.getConstant(0x00000000U, dl, MVT::i32);
14266 SB = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32,
14267 Sign, Zero, Sign, Zero);
14269 Op0 = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Op0, SB);
14270 Op1 = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Op1, SB);
14272 // Emulate PCMPGTQ with (hi1 > hi2) | ((hi1 == hi2) & (lo1 > lo2))
14273 SDValue GT = DAG.getNode(X86ISD::PCMPGT, dl, MVT::v4i32, Op0, Op1);
14274 SDValue EQ = DAG.getNode(X86ISD::PCMPEQ, dl, MVT::v4i32, Op0, Op1);
14276 // Create masks for only the low parts/high parts of the 64 bit integers.
14277 static const int MaskHi[] = { 1, 1, 3, 3 };
14278 static const int MaskLo[] = { 0, 0, 2, 2 };
14279 SDValue EQHi = DAG.getVectorShuffle(MVT::v4i32, dl, EQ, EQ, MaskHi);
14280 SDValue GTLo = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskLo);
14281 SDValue GTHi = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskHi);
14283 SDValue Result = DAG.getNode(ISD::AND, dl, MVT::v4i32, EQHi, GTLo);
14284 Result = DAG.getNode(ISD::OR, dl, MVT::v4i32, Result, GTHi);
14287 Result = DAG.getNOT(dl, Result, MVT::v4i32);
14289 return DAG.getBitcast(VT, Result);
14292 if (Opc == X86ISD::PCMPEQ && !Subtarget->hasSSE41()) {
14293 // If pcmpeqq is missing but pcmpeqd is available synthesize pcmpeqq with
14294 // pcmpeqd + pshufd + pand.
14295 assert(Subtarget->hasSSE2() && !FlipSigns && "Don't know how to lower!");
14297 // First cast everything to the right type.
14298 Op0 = DAG.getBitcast(MVT::v4i32, Op0);
14299 Op1 = DAG.getBitcast(MVT::v4i32, Op1);
14302 SDValue Result = DAG.getNode(Opc, dl, MVT::v4i32, Op0, Op1);
14304 // Make sure the lower and upper halves are both all-ones.
14305 static const int Mask[] = { 1, 0, 3, 2 };
14306 SDValue Shuf = DAG.getVectorShuffle(MVT::v4i32, dl, Result, Result, Mask);
14307 Result = DAG.getNode(ISD::AND, dl, MVT::v4i32, Result, Shuf);
14310 Result = DAG.getNOT(dl, Result, MVT::v4i32);
14312 return DAG.getBitcast(VT, Result);
14316 // Since SSE has no unsigned integer comparisons, we need to flip the sign
14317 // bits of the inputs before performing those operations.
14319 EVT EltVT = VT.getVectorElementType();
14320 SDValue SB = DAG.getConstant(APInt::getSignBit(EltVT.getSizeInBits()), dl,
14322 Op0 = DAG.getNode(ISD::XOR, dl, VT, Op0, SB);
14323 Op1 = DAG.getNode(ISD::XOR, dl, VT, Op1, SB);
14326 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
14328 // If the logical-not of the result is required, perform that now.
14330 Result = DAG.getNOT(dl, Result, VT);
14333 Result = DAG.getNode(X86ISD::PCMPEQ, dl, VT, Op0, Result);
14336 Result = DAG.getNode(X86ISD::PCMPEQ, dl, VT, Result,
14337 getZeroVector(VT, Subtarget, DAG, dl));
14342 SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
14344 MVT VT = Op.getSimpleValueType();
14346 if (VT.isVector()) return LowerVSETCC(Op, Subtarget, DAG);
14348 assert(((!Subtarget->hasAVX512() && VT == MVT::i8) || (VT == MVT::i1))
14349 && "SetCC type must be 8-bit or 1-bit integer");
14350 SDValue Op0 = Op.getOperand(0);
14351 SDValue Op1 = Op.getOperand(1);
14353 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
14355 // Optimize to BT if possible.
14356 // Lower (X & (1 << N)) == 0 to BT(X, N).
14357 // Lower ((X >>u N) & 1) != 0 to BT(X, N).
14358 // Lower ((X >>s N) & 1) != 0 to BT(X, N).
14359 if (Op0.getOpcode() == ISD::AND && Op0.hasOneUse() &&
14360 Op1.getOpcode() == ISD::Constant &&
14361 cast<ConstantSDNode>(Op1)->isNullValue() &&
14362 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14363 SDValue NewSetCC = LowerToBT(Op0, CC, dl, DAG);
14364 if (NewSetCC.getNode()) {
14366 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, NewSetCC);
14371 // Look for X == 0, X == 1, X != 0, or X != 1. We can simplify some forms of
14373 if (Op1.getOpcode() == ISD::Constant &&
14374 (cast<ConstantSDNode>(Op1)->getZExtValue() == 1 ||
14375 cast<ConstantSDNode>(Op1)->isNullValue()) &&
14376 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14378 // If the input is a setcc, then reuse the input setcc or use a new one with
14379 // the inverted condition.
14380 if (Op0.getOpcode() == X86ISD::SETCC) {
14381 X86::CondCode CCode = (X86::CondCode)Op0.getConstantOperandVal(0);
14382 bool Invert = (CC == ISD::SETNE) ^
14383 cast<ConstantSDNode>(Op1)->isNullValue();
14387 CCode = X86::GetOppositeBranchCondition(CCode);
14388 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
14389 DAG.getConstant(CCode, dl, MVT::i8),
14390 Op0.getOperand(1));
14392 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, SetCC);
14396 if ((Op0.getValueType() == MVT::i1) && (Op1.getOpcode() == ISD::Constant) &&
14397 (cast<ConstantSDNode>(Op1)->getZExtValue() == 1) &&
14398 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14400 ISD::CondCode NewCC = ISD::getSetCCInverse(CC, true);
14401 return DAG.getSetCC(dl, VT, Op0, DAG.getConstant(0, dl, MVT::i1), NewCC);
14404 bool isFP = Op1.getSimpleValueType().isFloatingPoint();
14405 unsigned X86CC = TranslateX86CC(CC, dl, isFP, Op0, Op1, DAG);
14406 if (X86CC == X86::COND_INVALID)
14409 SDValue EFLAGS = EmitCmp(Op0, Op1, X86CC, dl, DAG);
14410 EFLAGS = ConvertCmpIfNecessary(EFLAGS, DAG);
14411 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
14412 DAG.getConstant(X86CC, dl, MVT::i8), EFLAGS);
14414 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, SetCC);
14418 // isX86LogicalCmp - Return true if opcode is a X86 logical comparison.
14419 static bool isX86LogicalCmp(SDValue Op) {
14420 unsigned Opc = Op.getNode()->getOpcode();
14421 if (Opc == X86ISD::CMP || Opc == X86ISD::COMI || Opc == X86ISD::UCOMI ||
14422 Opc == X86ISD::SAHF)
14424 if (Op.getResNo() == 1 &&
14425 (Opc == X86ISD::ADD ||
14426 Opc == X86ISD::SUB ||
14427 Opc == X86ISD::ADC ||
14428 Opc == X86ISD::SBB ||
14429 Opc == X86ISD::SMUL ||
14430 Opc == X86ISD::UMUL ||
14431 Opc == X86ISD::INC ||
14432 Opc == X86ISD::DEC ||
14433 Opc == X86ISD::OR ||
14434 Opc == X86ISD::XOR ||
14435 Opc == X86ISD::AND))
14438 if (Op.getResNo() == 2 && Opc == X86ISD::UMUL)
14444 static bool isTruncWithZeroHighBitsInput(SDValue V, SelectionDAG &DAG) {
14445 if (V.getOpcode() != ISD::TRUNCATE)
14448 SDValue VOp0 = V.getOperand(0);
14449 unsigned InBits = VOp0.getValueSizeInBits();
14450 unsigned Bits = V.getValueSizeInBits();
14451 return DAG.MaskedValueIsZero(VOp0, APInt::getHighBitsSet(InBits,InBits-Bits));
14454 SDValue X86TargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
14455 bool addTest = true;
14456 SDValue Cond = Op.getOperand(0);
14457 SDValue Op1 = Op.getOperand(1);
14458 SDValue Op2 = Op.getOperand(2);
14460 EVT VT = Op1.getValueType();
14463 // Lower FP selects into a CMP/AND/ANDN/OR sequence when the necessary SSE ops
14464 // are available or VBLENDV if AVX is available.
14465 // Otherwise FP cmovs get lowered into a less efficient branch sequence later.
14466 if (Cond.getOpcode() == ISD::SETCC &&
14467 ((Subtarget->hasSSE2() && (VT == MVT::f32 || VT == MVT::f64)) ||
14468 (Subtarget->hasSSE1() && VT == MVT::f32)) &&
14469 VT == Cond.getOperand(0).getValueType() && Cond->hasOneUse()) {
14470 SDValue CondOp0 = Cond.getOperand(0), CondOp1 = Cond.getOperand(1);
14471 int SSECC = translateX86FSETCC(
14472 cast<CondCodeSDNode>(Cond.getOperand(2))->get(), CondOp0, CondOp1);
14475 if (Subtarget->hasAVX512()) {
14476 SDValue Cmp = DAG.getNode(X86ISD::FSETCC, DL, MVT::i1, CondOp0, CondOp1,
14477 DAG.getConstant(SSECC, DL, MVT::i8));
14478 return DAG.getNode(X86ISD::SELECT, DL, VT, Cmp, Op1, Op2);
14481 SDValue Cmp = DAG.getNode(X86ISD::FSETCC, DL, VT, CondOp0, CondOp1,
14482 DAG.getConstant(SSECC, DL, MVT::i8));
14484 // If we have AVX, we can use a variable vector select (VBLENDV) instead
14485 // of 3 logic instructions for size savings and potentially speed.
14486 // Unfortunately, there is no scalar form of VBLENDV.
14488 // If either operand is a constant, don't try this. We can expect to
14489 // optimize away at least one of the logic instructions later in that
14490 // case, so that sequence would be faster than a variable blend.
14492 // BLENDV was introduced with SSE 4.1, but the 2 register form implicitly
14493 // uses XMM0 as the selection register. That may need just as many
14494 // instructions as the AND/ANDN/OR sequence due to register moves, so
14497 if (Subtarget->hasAVX() &&
14498 !isa<ConstantFPSDNode>(Op1) && !isa<ConstantFPSDNode>(Op2)) {
14500 // Convert to vectors, do a VSELECT, and convert back to scalar.
14501 // All of the conversions should be optimized away.
14503 EVT VecVT = VT == MVT::f32 ? MVT::v4f32 : MVT::v2f64;
14504 SDValue VOp1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Op1);
14505 SDValue VOp2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Op2);
14506 SDValue VCmp = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Cmp);
14508 EVT VCmpVT = VT == MVT::f32 ? MVT::v4i32 : MVT::v2i64;
14509 VCmp = DAG.getBitcast(VCmpVT, VCmp);
14511 SDValue VSel = DAG.getNode(ISD::VSELECT, DL, VecVT, VCmp, VOp1, VOp2);
14513 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
14514 VSel, DAG.getIntPtrConstant(0, DL));
14516 SDValue AndN = DAG.getNode(X86ISD::FANDN, DL, VT, Cmp, Op2);
14517 SDValue And = DAG.getNode(X86ISD::FAND, DL, VT, Cmp, Op1);
14518 return DAG.getNode(X86ISD::FOR, DL, VT, AndN, And);
14522 if (VT.isVector() && VT.getScalarType() == MVT::i1) {
14524 if (ISD::isBuildVectorOfConstantSDNodes(Op1.getNode()))
14525 Op1Scalar = ConvertI1VectorToInteger(Op1, DAG);
14526 else if (Op1.getOpcode() == ISD::BITCAST && Op1.getOperand(0))
14527 Op1Scalar = Op1.getOperand(0);
14529 if (ISD::isBuildVectorOfConstantSDNodes(Op2.getNode()))
14530 Op2Scalar = ConvertI1VectorToInteger(Op2, DAG);
14531 else if (Op2.getOpcode() == ISD::BITCAST && Op2.getOperand(0))
14532 Op2Scalar = Op2.getOperand(0);
14533 if (Op1Scalar.getNode() && Op2Scalar.getNode()) {
14534 SDValue newSelect = DAG.getNode(ISD::SELECT, DL,
14535 Op1Scalar.getValueType(),
14536 Cond, Op1Scalar, Op2Scalar);
14537 if (newSelect.getValueSizeInBits() == VT.getSizeInBits())
14538 return DAG.getBitcast(VT, newSelect);
14539 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, newSelect);
14540 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, ExtVec,
14541 DAG.getIntPtrConstant(0, DL));
14545 if (VT == MVT::v4i1 || VT == MVT::v2i1) {
14546 SDValue zeroConst = DAG.getIntPtrConstant(0, DL);
14547 Op1 = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, MVT::v8i1,
14548 DAG.getUNDEF(MVT::v8i1), Op1, zeroConst);
14549 Op2 = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, MVT::v8i1,
14550 DAG.getUNDEF(MVT::v8i1), Op2, zeroConst);
14551 SDValue newSelect = DAG.getNode(ISD::SELECT, DL, MVT::v8i1,
14553 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, newSelect, zeroConst);
14556 if (Cond.getOpcode() == ISD::SETCC) {
14557 SDValue NewCond = LowerSETCC(Cond, DAG);
14558 if (NewCond.getNode())
14562 // (select (x == 0), -1, y) -> (sign_bit (x - 1)) | y
14563 // (select (x == 0), y, -1) -> ~(sign_bit (x - 1)) | y
14564 // (select (x != 0), y, -1) -> (sign_bit (x - 1)) | y
14565 // (select (x != 0), -1, y) -> ~(sign_bit (x - 1)) | y
14566 if (Cond.getOpcode() == X86ISD::SETCC &&
14567 Cond.getOperand(1).getOpcode() == X86ISD::CMP &&
14568 isZero(Cond.getOperand(1).getOperand(1))) {
14569 SDValue Cmp = Cond.getOperand(1);
14571 unsigned CondCode =cast<ConstantSDNode>(Cond.getOperand(0))->getZExtValue();
14573 if ((isAllOnes(Op1) || isAllOnes(Op2)) &&
14574 (CondCode == X86::COND_E || CondCode == X86::COND_NE)) {
14575 SDValue Y = isAllOnes(Op2) ? Op1 : Op2;
14577 SDValue CmpOp0 = Cmp.getOperand(0);
14578 // Apply further optimizations for special cases
14579 // (select (x != 0), -1, 0) -> neg & sbb
14580 // (select (x == 0), 0, -1) -> neg & sbb
14581 if (ConstantSDNode *YC = dyn_cast<ConstantSDNode>(Y))
14582 if (YC->isNullValue() &&
14583 (isAllOnes(Op1) == (CondCode == X86::COND_NE))) {
14584 SDVTList VTs = DAG.getVTList(CmpOp0.getValueType(), MVT::i32);
14585 SDValue Neg = DAG.getNode(X86ISD::SUB, DL, VTs,
14586 DAG.getConstant(0, DL,
14587 CmpOp0.getValueType()),
14589 SDValue Res = DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14590 DAG.getConstant(X86::COND_B, DL, MVT::i8),
14591 SDValue(Neg.getNode(), 1));
14595 Cmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32,
14596 CmpOp0, DAG.getConstant(1, DL, CmpOp0.getValueType()));
14597 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
14599 SDValue Res = // Res = 0 or -1.
14600 DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14601 DAG.getConstant(X86::COND_B, DL, MVT::i8), Cmp);
14603 if (isAllOnes(Op1) != (CondCode == X86::COND_E))
14604 Res = DAG.getNOT(DL, Res, Res.getValueType());
14606 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(Op2);
14607 if (!N2C || !N2C->isNullValue())
14608 Res = DAG.getNode(ISD::OR, DL, Res.getValueType(), Res, Y);
14613 // Look past (and (setcc_carry (cmp ...)), 1).
14614 if (Cond.getOpcode() == ISD::AND &&
14615 Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
14616 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Cond.getOperand(1));
14617 if (C && C->getAPIntValue() == 1)
14618 Cond = Cond.getOperand(0);
14621 // If condition flag is set by a X86ISD::CMP, then use it as the condition
14622 // setting operand in place of the X86ISD::SETCC.
14623 unsigned CondOpcode = Cond.getOpcode();
14624 if (CondOpcode == X86ISD::SETCC ||
14625 CondOpcode == X86ISD::SETCC_CARRY) {
14626 CC = Cond.getOperand(0);
14628 SDValue Cmp = Cond.getOperand(1);
14629 unsigned Opc = Cmp.getOpcode();
14630 MVT VT = Op.getSimpleValueType();
14632 bool IllegalFPCMov = false;
14633 if (VT.isFloatingPoint() && !VT.isVector() &&
14634 !isScalarFPTypeInSSEReg(VT)) // FPStack?
14635 IllegalFPCMov = !hasFPCMov(cast<ConstantSDNode>(CC)->getSExtValue());
14637 if ((isX86LogicalCmp(Cmp) && !IllegalFPCMov) ||
14638 Opc == X86ISD::BT) { // FIXME
14642 } else if (CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
14643 CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
14644 ((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
14645 Cond.getOperand(0).getValueType() != MVT::i8)) {
14646 SDValue LHS = Cond.getOperand(0);
14647 SDValue RHS = Cond.getOperand(1);
14648 unsigned X86Opcode;
14651 switch (CondOpcode) {
14652 case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
14653 case ISD::SADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
14654 case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
14655 case ISD::SSUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
14656 case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
14657 case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
14658 default: llvm_unreachable("unexpected overflowing operator");
14660 if (CondOpcode == ISD::UMULO)
14661 VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
14664 VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
14666 SDValue X86Op = DAG.getNode(X86Opcode, DL, VTs, LHS, RHS);
14668 if (CondOpcode == ISD::UMULO)
14669 Cond = X86Op.getValue(2);
14671 Cond = X86Op.getValue(1);
14673 CC = DAG.getConstant(X86Cond, DL, MVT::i8);
14678 // Look past the truncate if the high bits are known zero.
14679 if (isTruncWithZeroHighBitsInput(Cond, DAG))
14680 Cond = Cond.getOperand(0);
14682 // We know the result of AND is compared against zero. Try to match
14684 if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
14685 SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, DL, DAG);
14686 if (NewSetCC.getNode()) {
14687 CC = NewSetCC.getOperand(0);
14688 Cond = NewSetCC.getOperand(1);
14695 CC = DAG.getConstant(X86::COND_NE, DL, MVT::i8);
14696 Cond = EmitTest(Cond, X86::COND_NE, DL, DAG);
14699 // a < b ? -1 : 0 -> RES = ~setcc_carry
14700 // a < b ? 0 : -1 -> RES = setcc_carry
14701 // a >= b ? -1 : 0 -> RES = setcc_carry
14702 // a >= b ? 0 : -1 -> RES = ~setcc_carry
14703 if (Cond.getOpcode() == X86ISD::SUB) {
14704 Cond = ConvertCmpIfNecessary(Cond, DAG);
14705 unsigned CondCode = cast<ConstantSDNode>(CC)->getZExtValue();
14707 if ((CondCode == X86::COND_AE || CondCode == X86::COND_B) &&
14708 (isAllOnes(Op1) || isAllOnes(Op2)) && (isZero(Op1) || isZero(Op2))) {
14709 SDValue Res = DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14710 DAG.getConstant(X86::COND_B, DL, MVT::i8),
14712 if (isAllOnes(Op1) != (CondCode == X86::COND_B))
14713 return DAG.getNOT(DL, Res, Res.getValueType());
14718 // X86 doesn't have an i8 cmov. If both operands are the result of a truncate
14719 // widen the cmov and push the truncate through. This avoids introducing a new
14720 // branch during isel and doesn't add any extensions.
14721 if (Op.getValueType() == MVT::i8 &&
14722 Op1.getOpcode() == ISD::TRUNCATE && Op2.getOpcode() == ISD::TRUNCATE) {
14723 SDValue T1 = Op1.getOperand(0), T2 = Op2.getOperand(0);
14724 if (T1.getValueType() == T2.getValueType() &&
14725 // Blacklist CopyFromReg to avoid partial register stalls.
14726 T1.getOpcode() != ISD::CopyFromReg && T2.getOpcode()!=ISD::CopyFromReg){
14727 SDVTList VTs = DAG.getVTList(T1.getValueType(), MVT::Glue);
14728 SDValue Cmov = DAG.getNode(X86ISD::CMOV, DL, VTs, T2, T1, CC, Cond);
14729 return DAG.getNode(ISD::TRUNCATE, DL, Op.getValueType(), Cmov);
14733 // X86ISD::CMOV means set the result (which is operand 1) to the RHS if
14734 // condition is true.
14735 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
14736 SDValue Ops[] = { Op2, Op1, CC, Cond };
14737 return DAG.getNode(X86ISD::CMOV, DL, VTs, Ops);
14740 static SDValue LowerSIGN_EXTEND_AVX512(SDValue Op,
14741 const X86Subtarget *Subtarget,
14742 SelectionDAG &DAG) {
14743 MVT VT = Op->getSimpleValueType(0);
14744 SDValue In = Op->getOperand(0);
14745 MVT InVT = In.getSimpleValueType();
14746 MVT VTElt = VT.getVectorElementType();
14747 MVT InVTElt = InVT.getVectorElementType();
14751 if ((InVTElt == MVT::i1) &&
14752 (((Subtarget->hasBWI() && Subtarget->hasVLX() &&
14753 VT.getSizeInBits() <= 256 && VTElt.getSizeInBits() <= 16)) ||
14755 ((Subtarget->hasBWI() && VT.is512BitVector() &&
14756 VTElt.getSizeInBits() <= 16)) ||
14758 ((Subtarget->hasDQI() && Subtarget->hasVLX() &&
14759 VT.getSizeInBits() <= 256 && VTElt.getSizeInBits() >= 32)) ||
14761 ((Subtarget->hasDQI() && VT.is512BitVector() &&
14762 VTElt.getSizeInBits() >= 32))))
14763 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
14765 unsigned int NumElts = VT.getVectorNumElements();
14767 if (NumElts != 8 && NumElts != 16 && !Subtarget->hasBWI())
14770 if (VT.is512BitVector() && InVT.getVectorElementType() != MVT::i1) {
14771 if (In.getOpcode() == X86ISD::VSEXT || In.getOpcode() == X86ISD::VZEXT)
14772 return DAG.getNode(In.getOpcode(), dl, VT, In.getOperand(0));
14773 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
14776 assert (InVT.getVectorElementType() == MVT::i1 && "Unexpected vector type");
14777 MVT ExtVT = NumElts == 8 ? MVT::v8i64 : MVT::v16i32;
14779 DAG.getConstant(APInt::getAllOnesValue(ExtVT.getScalarSizeInBits()), dl,
14782 DAG.getConstant(APInt::getNullValue(ExtVT.getScalarSizeInBits()), dl, ExtVT);
14784 SDValue V = DAG.getNode(ISD::VSELECT, dl, ExtVT, In, NegOne, Zero);
14785 if (VT.is512BitVector())
14787 return DAG.getNode(X86ISD::VTRUNC, dl, VT, V);
14790 static SDValue LowerSIGN_EXTEND_VECTOR_INREG(SDValue Op,
14791 const X86Subtarget *Subtarget,
14792 SelectionDAG &DAG) {
14793 SDValue In = Op->getOperand(0);
14794 MVT VT = Op->getSimpleValueType(0);
14795 MVT InVT = In.getSimpleValueType();
14796 assert(VT.getSizeInBits() == InVT.getSizeInBits());
14798 MVT InSVT = InVT.getScalarType();
14799 assert(VT.getScalarType().getScalarSizeInBits() > InSVT.getScalarSizeInBits());
14801 if (VT != MVT::v2i64 && VT != MVT::v4i32 && VT != MVT::v8i16)
14803 if (InSVT != MVT::i32 && InSVT != MVT::i16 && InSVT != MVT::i8)
14808 // SSE41 targets can use the pmovsx* instructions directly.
14809 if (Subtarget->hasSSE41())
14810 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
14812 // pre-SSE41 targets unpack lower lanes and then sign-extend using SRAI.
14816 // As SRAI is only available on i16/i32 types, we expand only up to i32
14817 // and handle i64 separately.
14818 while (CurrVT != VT && CurrVT.getScalarType() != MVT::i32) {
14819 Curr = DAG.getNode(X86ISD::UNPCKL, dl, CurrVT, DAG.getUNDEF(CurrVT), Curr);
14820 MVT CurrSVT = MVT::getIntegerVT(CurrVT.getScalarSizeInBits() * 2);
14821 CurrVT = MVT::getVectorVT(CurrSVT, CurrVT.getVectorNumElements() / 2);
14822 Curr = DAG.getBitcast(CurrVT, Curr);
14825 SDValue SignExt = Curr;
14826 if (CurrVT != InVT) {
14827 unsigned SignExtShift =
14828 CurrVT.getScalarSizeInBits() - InSVT.getScalarSizeInBits();
14829 SignExt = DAG.getNode(X86ISD::VSRAI, dl, CurrVT, Curr,
14830 DAG.getConstant(SignExtShift, dl, MVT::i8));
14836 if (VT == MVT::v2i64 && CurrVT == MVT::v4i32) {
14837 SDValue Sign = DAG.getNode(X86ISD::VSRAI, dl, CurrVT, Curr,
14838 DAG.getConstant(31, dl, MVT::i8));
14839 SDValue Ext = DAG.getVectorShuffle(CurrVT, dl, SignExt, Sign, {0, 4, 1, 5});
14840 return DAG.getBitcast(VT, Ext);
14846 static SDValue LowerSIGN_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
14847 SelectionDAG &DAG) {
14848 MVT VT = Op->getSimpleValueType(0);
14849 SDValue In = Op->getOperand(0);
14850 MVT InVT = In.getSimpleValueType();
14853 if (VT.is512BitVector() || InVT.getVectorElementType() == MVT::i1)
14854 return LowerSIGN_EXTEND_AVX512(Op, Subtarget, DAG);
14856 if ((VT != MVT::v4i64 || InVT != MVT::v4i32) &&
14857 (VT != MVT::v8i32 || InVT != MVT::v8i16) &&
14858 (VT != MVT::v16i16 || InVT != MVT::v16i8))
14861 if (Subtarget->hasInt256())
14862 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
14864 // Optimize vectors in AVX mode
14865 // Sign extend v8i16 to v8i32 and
14868 // Divide input vector into two parts
14869 // for v4i32 the shuffle mask will be { 0, 1, -1, -1} {2, 3, -1, -1}
14870 // use vpmovsx instruction to extend v4i32 -> v2i64; v8i16 -> v4i32
14871 // concat the vectors to original VT
14873 unsigned NumElems = InVT.getVectorNumElements();
14874 SDValue Undef = DAG.getUNDEF(InVT);
14876 SmallVector<int,8> ShufMask1(NumElems, -1);
14877 for (unsigned i = 0; i != NumElems/2; ++i)
14880 SDValue OpLo = DAG.getVectorShuffle(InVT, dl, In, Undef, &ShufMask1[0]);
14882 SmallVector<int,8> ShufMask2(NumElems, -1);
14883 for (unsigned i = 0; i != NumElems/2; ++i)
14884 ShufMask2[i] = i + NumElems/2;
14886 SDValue OpHi = DAG.getVectorShuffle(InVT, dl, In, Undef, &ShufMask2[0]);
14888 MVT HalfVT = MVT::getVectorVT(VT.getScalarType(),
14889 VT.getVectorNumElements()/2);
14891 OpLo = DAG.getNode(X86ISD::VSEXT, dl, HalfVT, OpLo);
14892 OpHi = DAG.getNode(X86ISD::VSEXT, dl, HalfVT, OpHi);
14894 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
14897 // Lower vector extended loads using a shuffle. If SSSE3 is not available we
14898 // may emit an illegal shuffle but the expansion is still better than scalar
14899 // code. We generate X86ISD::VSEXT for SEXTLOADs if it's available, otherwise
14900 // we'll emit a shuffle and a arithmetic shift.
14901 // FIXME: Is the expansion actually better than scalar code? It doesn't seem so.
14902 // TODO: It is possible to support ZExt by zeroing the undef values during
14903 // the shuffle phase or after the shuffle.
14904 static SDValue LowerExtendedLoad(SDValue Op, const X86Subtarget *Subtarget,
14905 SelectionDAG &DAG) {
14906 MVT RegVT = Op.getSimpleValueType();
14907 assert(RegVT.isVector() && "We only custom lower vector sext loads.");
14908 assert(RegVT.isInteger() &&
14909 "We only custom lower integer vector sext loads.");
14911 // Nothing useful we can do without SSE2 shuffles.
14912 assert(Subtarget->hasSSE2() && "We only custom lower sext loads with SSE2.");
14914 LoadSDNode *Ld = cast<LoadSDNode>(Op.getNode());
14916 EVT MemVT = Ld->getMemoryVT();
14917 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
14918 unsigned RegSz = RegVT.getSizeInBits();
14920 ISD::LoadExtType Ext = Ld->getExtensionType();
14922 assert((Ext == ISD::EXTLOAD || Ext == ISD::SEXTLOAD)
14923 && "Only anyext and sext are currently implemented.");
14924 assert(MemVT != RegVT && "Cannot extend to the same type");
14925 assert(MemVT.isVector() && "Must load a vector from memory");
14927 unsigned NumElems = RegVT.getVectorNumElements();
14928 unsigned MemSz = MemVT.getSizeInBits();
14929 assert(RegSz > MemSz && "Register size must be greater than the mem size");
14931 if (Ext == ISD::SEXTLOAD && RegSz == 256 && !Subtarget->hasInt256()) {
14932 // The only way in which we have a legal 256-bit vector result but not the
14933 // integer 256-bit operations needed to directly lower a sextload is if we
14934 // have AVX1 but not AVX2. In that case, we can always emit a sextload to
14935 // a 128-bit vector and a normal sign_extend to 256-bits that should get
14936 // correctly legalized. We do this late to allow the canonical form of
14937 // sextload to persist throughout the rest of the DAG combiner -- it wants
14938 // to fold together any extensions it can, and so will fuse a sign_extend
14939 // of an sextload into a sextload targeting a wider value.
14941 if (MemSz == 128) {
14942 // Just switch this to a normal load.
14943 assert(TLI.isTypeLegal(MemVT) && "If the memory type is a 128-bit type, "
14944 "it must be a legal 128-bit vector "
14946 Load = DAG.getLoad(MemVT, dl, Ld->getChain(), Ld->getBasePtr(),
14947 Ld->getPointerInfo(), Ld->isVolatile(), Ld->isNonTemporal(),
14948 Ld->isInvariant(), Ld->getAlignment());
14950 assert(MemSz < 128 &&
14951 "Can't extend a type wider than 128 bits to a 256 bit vector!");
14952 // Do an sext load to a 128-bit vector type. We want to use the same
14953 // number of elements, but elements half as wide. This will end up being
14954 // recursively lowered by this routine, but will succeed as we definitely
14955 // have all the necessary features if we're using AVX1.
14957 EVT::getIntegerVT(*DAG.getContext(), RegVT.getScalarSizeInBits() / 2);
14958 EVT HalfVecVT = EVT::getVectorVT(*DAG.getContext(), HalfEltVT, NumElems);
14960 DAG.getExtLoad(Ext, dl, HalfVecVT, Ld->getChain(), Ld->getBasePtr(),
14961 Ld->getPointerInfo(), MemVT, Ld->isVolatile(),
14962 Ld->isNonTemporal(), Ld->isInvariant(),
14963 Ld->getAlignment());
14966 // Replace chain users with the new chain.
14967 assert(Load->getNumValues() == 2 && "Loads must carry a chain!");
14968 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), Load.getValue(1));
14970 // Finally, do a normal sign-extend to the desired register.
14971 return DAG.getSExtOrTrunc(Load, dl, RegVT);
14974 // All sizes must be a power of two.
14975 assert(isPowerOf2_32(RegSz * MemSz * NumElems) &&
14976 "Non-power-of-two elements are not custom lowered!");
14978 // Attempt to load the original value using scalar loads.
14979 // Find the largest scalar type that divides the total loaded size.
14980 MVT SclrLoadTy = MVT::i8;
14981 for (MVT Tp : MVT::integer_valuetypes()) {
14982 if (TLI.isTypeLegal(Tp) && ((MemSz % Tp.getSizeInBits()) == 0)) {
14987 // On 32bit systems, we can't save 64bit integers. Try bitcasting to F64.
14988 if (TLI.isTypeLegal(MVT::f64) && SclrLoadTy.getSizeInBits() < 64 &&
14990 SclrLoadTy = MVT::f64;
14992 // Calculate the number of scalar loads that we need to perform
14993 // in order to load our vector from memory.
14994 unsigned NumLoads = MemSz / SclrLoadTy.getSizeInBits();
14996 assert((Ext != ISD::SEXTLOAD || NumLoads == 1) &&
14997 "Can only lower sext loads with a single scalar load!");
14999 unsigned loadRegZize = RegSz;
15000 if (Ext == ISD::SEXTLOAD && RegSz >= 256)
15003 // Represent our vector as a sequence of elements which are the
15004 // largest scalar that we can load.
15005 EVT LoadUnitVecVT = EVT::getVectorVT(
15006 *DAG.getContext(), SclrLoadTy, loadRegZize / SclrLoadTy.getSizeInBits());
15008 // Represent the data using the same element type that is stored in
15009 // memory. In practice, we ''widen'' MemVT.
15011 EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
15012 loadRegZize / MemVT.getScalarType().getSizeInBits());
15014 assert(WideVecVT.getSizeInBits() == LoadUnitVecVT.getSizeInBits() &&
15015 "Invalid vector type");
15017 // We can't shuffle using an illegal type.
15018 assert(TLI.isTypeLegal(WideVecVT) &&
15019 "We only lower types that form legal widened vector types");
15021 SmallVector<SDValue, 8> Chains;
15022 SDValue Ptr = Ld->getBasePtr();
15023 SDValue Increment = DAG.getConstant(SclrLoadTy.getSizeInBits() / 8, dl,
15024 TLI.getPointerTy(DAG.getDataLayout()));
15025 SDValue Res = DAG.getUNDEF(LoadUnitVecVT);
15027 for (unsigned i = 0; i < NumLoads; ++i) {
15028 // Perform a single load.
15029 SDValue ScalarLoad =
15030 DAG.getLoad(SclrLoadTy, dl, Ld->getChain(), Ptr, Ld->getPointerInfo(),
15031 Ld->isVolatile(), Ld->isNonTemporal(), Ld->isInvariant(),
15032 Ld->getAlignment());
15033 Chains.push_back(ScalarLoad.getValue(1));
15034 // Create the first element type using SCALAR_TO_VECTOR in order to avoid
15035 // another round of DAGCombining.
15037 Res = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LoadUnitVecVT, ScalarLoad);
15039 Res = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, LoadUnitVecVT, Res,
15040 ScalarLoad, DAG.getIntPtrConstant(i, dl));
15042 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
15045 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
15047 // Bitcast the loaded value to a vector of the original element type, in
15048 // the size of the target vector type.
15049 SDValue SlicedVec = DAG.getBitcast(WideVecVT, Res);
15050 unsigned SizeRatio = RegSz / MemSz;
15052 if (Ext == ISD::SEXTLOAD) {
15053 // If we have SSE4.1, we can directly emit a VSEXT node.
15054 if (Subtarget->hasSSE41()) {
15055 SDValue Sext = DAG.getNode(X86ISD::VSEXT, dl, RegVT, SlicedVec);
15056 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15060 // Otherwise we'll use SIGN_EXTEND_VECTOR_INREG to sign extend the lowest
15062 assert(TLI.isOperationLegalOrCustom(ISD::SIGN_EXTEND_VECTOR_INREG, RegVT) &&
15063 "We can't implement a sext load without SIGN_EXTEND_VECTOR_INREG!");
15065 SDValue Shuff = DAG.getSignExtendVectorInReg(SlicedVec, dl, RegVT);
15066 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15070 // Redistribute the loaded elements into the different locations.
15071 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
15072 for (unsigned i = 0; i != NumElems; ++i)
15073 ShuffleVec[i * SizeRatio] = i;
15075 SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, SlicedVec,
15076 DAG.getUNDEF(WideVecVT), &ShuffleVec[0]);
15078 // Bitcast to the requested type.
15079 Shuff = DAG.getBitcast(RegVT, Shuff);
15080 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15084 // isAndOrOfSingleUseSetCCs - Return true if node is an ISD::AND or
15085 // ISD::OR of two X86ISD::SETCC nodes each of which has no other use apart
15086 // from the AND / OR.
15087 static bool isAndOrOfSetCCs(SDValue Op, unsigned &Opc) {
15088 Opc = Op.getOpcode();
15089 if (Opc != ISD::OR && Opc != ISD::AND)
15091 return (Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
15092 Op.getOperand(0).hasOneUse() &&
15093 Op.getOperand(1).getOpcode() == X86ISD::SETCC &&
15094 Op.getOperand(1).hasOneUse());
15097 // isXor1OfSetCC - Return true if node is an ISD::XOR of a X86ISD::SETCC and
15098 // 1 and that the SETCC node has a single use.
15099 static bool isXor1OfSetCC(SDValue Op) {
15100 if (Op.getOpcode() != ISD::XOR)
15102 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
15103 if (N1C && N1C->getAPIntValue() == 1) {
15104 return Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
15105 Op.getOperand(0).hasOneUse();
15110 SDValue X86TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
15111 bool addTest = true;
15112 SDValue Chain = Op.getOperand(0);
15113 SDValue Cond = Op.getOperand(1);
15114 SDValue Dest = Op.getOperand(2);
15117 bool Inverted = false;
15119 if (Cond.getOpcode() == ISD::SETCC) {
15120 // Check for setcc([su]{add,sub,mul}o == 0).
15121 if (cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETEQ &&
15122 isa<ConstantSDNode>(Cond.getOperand(1)) &&
15123 cast<ConstantSDNode>(Cond.getOperand(1))->isNullValue() &&
15124 Cond.getOperand(0).getResNo() == 1 &&
15125 (Cond.getOperand(0).getOpcode() == ISD::SADDO ||
15126 Cond.getOperand(0).getOpcode() == ISD::UADDO ||
15127 Cond.getOperand(0).getOpcode() == ISD::SSUBO ||
15128 Cond.getOperand(0).getOpcode() == ISD::USUBO ||
15129 Cond.getOperand(0).getOpcode() == ISD::SMULO ||
15130 Cond.getOperand(0).getOpcode() == ISD::UMULO)) {
15132 Cond = Cond.getOperand(0);
15134 SDValue NewCond = LowerSETCC(Cond, DAG);
15135 if (NewCond.getNode())
15140 // FIXME: LowerXALUO doesn't handle these!!
15141 else if (Cond.getOpcode() == X86ISD::ADD ||
15142 Cond.getOpcode() == X86ISD::SUB ||
15143 Cond.getOpcode() == X86ISD::SMUL ||
15144 Cond.getOpcode() == X86ISD::UMUL)
15145 Cond = LowerXALUO(Cond, DAG);
15148 // Look pass (and (setcc_carry (cmp ...)), 1).
15149 if (Cond.getOpcode() == ISD::AND &&
15150 Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
15151 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Cond.getOperand(1));
15152 if (C && C->getAPIntValue() == 1)
15153 Cond = Cond.getOperand(0);
15156 // If condition flag is set by a X86ISD::CMP, then use it as the condition
15157 // setting operand in place of the X86ISD::SETCC.
15158 unsigned CondOpcode = Cond.getOpcode();
15159 if (CondOpcode == X86ISD::SETCC ||
15160 CondOpcode == X86ISD::SETCC_CARRY) {
15161 CC = Cond.getOperand(0);
15163 SDValue Cmp = Cond.getOperand(1);
15164 unsigned Opc = Cmp.getOpcode();
15165 // FIXME: WHY THE SPECIAL CASING OF LogicalCmp??
15166 if (isX86LogicalCmp(Cmp) || Opc == X86ISD::BT) {
15170 switch (cast<ConstantSDNode>(CC)->getZExtValue()) {
15174 // These can only come from an arithmetic instruction with overflow,
15175 // e.g. SADDO, UADDO.
15176 Cond = Cond.getNode()->getOperand(1);
15182 CondOpcode = Cond.getOpcode();
15183 if (CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
15184 CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
15185 ((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
15186 Cond.getOperand(0).getValueType() != MVT::i8)) {
15187 SDValue LHS = Cond.getOperand(0);
15188 SDValue RHS = Cond.getOperand(1);
15189 unsigned X86Opcode;
15192 // Keep this in sync with LowerXALUO, otherwise we might create redundant
15193 // instructions that can't be removed afterwards (i.e. X86ISD::ADD and
15195 switch (CondOpcode) {
15196 case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
15198 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
15200 X86Opcode = X86ISD::INC; X86Cond = X86::COND_O;
15203 X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
15204 case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
15206 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
15208 X86Opcode = X86ISD::DEC; X86Cond = X86::COND_O;
15211 X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
15212 case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
15213 case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
15214 default: llvm_unreachable("unexpected overflowing operator");
15217 X86Cond = X86::GetOppositeBranchCondition((X86::CondCode)X86Cond);
15218 if (CondOpcode == ISD::UMULO)
15219 VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
15222 VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
15224 SDValue X86Op = DAG.getNode(X86Opcode, dl, VTs, LHS, RHS);
15226 if (CondOpcode == ISD::UMULO)
15227 Cond = X86Op.getValue(2);
15229 Cond = X86Op.getValue(1);
15231 CC = DAG.getConstant(X86Cond, dl, MVT::i8);
15235 if (Cond.hasOneUse() && isAndOrOfSetCCs(Cond, CondOpc)) {
15236 SDValue Cmp = Cond.getOperand(0).getOperand(1);
15237 if (CondOpc == ISD::OR) {
15238 // Also, recognize the pattern generated by an FCMP_UNE. We can emit
15239 // two branches instead of an explicit OR instruction with a
15241 if (Cmp == Cond.getOperand(1).getOperand(1) &&
15242 isX86LogicalCmp(Cmp)) {
15243 CC = Cond.getOperand(0).getOperand(0);
15244 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15245 Chain, Dest, CC, Cmp);
15246 CC = Cond.getOperand(1).getOperand(0);
15250 } else { // ISD::AND
15251 // Also, recognize the pattern generated by an FCMP_OEQ. We can emit
15252 // two branches instead of an explicit AND instruction with a
15253 // separate test. However, we only do this if this block doesn't
15254 // have a fall-through edge, because this requires an explicit
15255 // jmp when the condition is false.
15256 if (Cmp == Cond.getOperand(1).getOperand(1) &&
15257 isX86LogicalCmp(Cmp) &&
15258 Op.getNode()->hasOneUse()) {
15259 X86::CondCode CCode =
15260 (X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
15261 CCode = X86::GetOppositeBranchCondition(CCode);
15262 CC = DAG.getConstant(CCode, dl, MVT::i8);
15263 SDNode *User = *Op.getNode()->use_begin();
15264 // Look for an unconditional branch following this conditional branch.
15265 // We need this because we need to reverse the successors in order
15266 // to implement FCMP_OEQ.
15267 if (User->getOpcode() == ISD::BR) {
15268 SDValue FalseBB = User->getOperand(1);
15270 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15271 assert(NewBR == User);
15275 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15276 Chain, Dest, CC, Cmp);
15277 X86::CondCode CCode =
15278 (X86::CondCode)Cond.getOperand(1).getConstantOperandVal(0);
15279 CCode = X86::GetOppositeBranchCondition(CCode);
15280 CC = DAG.getConstant(CCode, dl, MVT::i8);
15286 } else if (Cond.hasOneUse() && isXor1OfSetCC(Cond)) {
15287 // Recognize for xorb (setcc), 1 patterns. The xor inverts the condition.
15288 // It should be transformed during dag combiner except when the condition
15289 // is set by a arithmetics with overflow node.
15290 X86::CondCode CCode =
15291 (X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
15292 CCode = X86::GetOppositeBranchCondition(CCode);
15293 CC = DAG.getConstant(CCode, dl, MVT::i8);
15294 Cond = Cond.getOperand(0).getOperand(1);
15296 } else if (Cond.getOpcode() == ISD::SETCC &&
15297 cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETOEQ) {
15298 // For FCMP_OEQ, we can emit
15299 // two branches instead of an explicit AND instruction with a
15300 // separate test. However, we only do this if this block doesn't
15301 // have a fall-through edge, because this requires an explicit
15302 // jmp when the condition is false.
15303 if (Op.getNode()->hasOneUse()) {
15304 SDNode *User = *Op.getNode()->use_begin();
15305 // Look for an unconditional branch following this conditional branch.
15306 // We need this because we need to reverse the successors in order
15307 // to implement FCMP_OEQ.
15308 if (User->getOpcode() == ISD::BR) {
15309 SDValue FalseBB = User->getOperand(1);
15311 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15312 assert(NewBR == User);
15316 SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
15317 Cond.getOperand(0), Cond.getOperand(1));
15318 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
15319 CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
15320 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15321 Chain, Dest, CC, Cmp);
15322 CC = DAG.getConstant(X86::COND_P, dl, MVT::i8);
15327 } else if (Cond.getOpcode() == ISD::SETCC &&
15328 cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETUNE) {
15329 // For FCMP_UNE, we can emit
15330 // two branches instead of an explicit AND instruction with a
15331 // separate test. However, we only do this if this block doesn't
15332 // have a fall-through edge, because this requires an explicit
15333 // jmp when the condition is false.
15334 if (Op.getNode()->hasOneUse()) {
15335 SDNode *User = *Op.getNode()->use_begin();
15336 // Look for an unconditional branch following this conditional branch.
15337 // We need this because we need to reverse the successors in order
15338 // to implement FCMP_UNE.
15339 if (User->getOpcode() == ISD::BR) {
15340 SDValue FalseBB = User->getOperand(1);
15342 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15343 assert(NewBR == User);
15346 SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
15347 Cond.getOperand(0), Cond.getOperand(1));
15348 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
15349 CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
15350 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15351 Chain, Dest, CC, Cmp);
15352 CC = DAG.getConstant(X86::COND_NP, dl, MVT::i8);
15362 // Look pass the truncate if the high bits are known zero.
15363 if (isTruncWithZeroHighBitsInput(Cond, DAG))
15364 Cond = Cond.getOperand(0);
15366 // We know the result of AND is compared against zero. Try to match
15368 if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
15369 SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, dl, DAG);
15370 if (NewSetCC.getNode()) {
15371 CC = NewSetCC.getOperand(0);
15372 Cond = NewSetCC.getOperand(1);
15379 X86::CondCode X86Cond = Inverted ? X86::COND_E : X86::COND_NE;
15380 CC = DAG.getConstant(X86Cond, dl, MVT::i8);
15381 Cond = EmitTest(Cond, X86Cond, dl, DAG);
15383 Cond = ConvertCmpIfNecessary(Cond, DAG);
15384 return DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15385 Chain, Dest, CC, Cond);
15388 // Lower dynamic stack allocation to _alloca call for Cygwin/Mingw targets.
15389 // Calls to _alloca are needed to probe the stack when allocating more than 4k
15390 // bytes in one go. Touching the stack at 4K increments is necessary to ensure
15391 // that the guard pages used by the OS virtual memory manager are allocated in
15392 // correct sequence.
15394 X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
15395 SelectionDAG &DAG) const {
15396 MachineFunction &MF = DAG.getMachineFunction();
15397 bool SplitStack = MF.shouldSplitStack();
15398 bool Lower = (Subtarget->isOSWindows() && !Subtarget->isTargetMachO()) ||
15403 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
15404 SDNode* Node = Op.getNode();
15406 unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
15407 assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and"
15408 " not tell us which reg is the stack pointer!");
15409 EVT VT = Node->getValueType(0);
15410 SDValue Tmp1 = SDValue(Node, 0);
15411 SDValue Tmp2 = SDValue(Node, 1);
15412 SDValue Tmp3 = Node->getOperand(2);
15413 SDValue Chain = Tmp1.getOperand(0);
15415 // Chain the dynamic stack allocation so that it doesn't modify the stack
15416 // pointer when other instructions are using the stack.
15417 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, dl, true),
15420 SDValue Size = Tmp2.getOperand(1);
15421 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
15422 Chain = SP.getValue(1);
15423 unsigned Align = cast<ConstantSDNode>(Tmp3)->getZExtValue();
15424 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
15425 unsigned StackAlign = TFI.getStackAlignment();
15426 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, SP, Size); // Value
15427 if (Align > StackAlign)
15428 Tmp1 = DAG.getNode(ISD::AND, dl, VT, Tmp1,
15429 DAG.getConstant(-(uint64_t)Align, dl, VT));
15430 Chain = DAG.getCopyToReg(Chain, dl, SPReg, Tmp1); // Output chain
15432 Tmp2 = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, dl, true),
15433 DAG.getIntPtrConstant(0, dl, true), SDValue(),
15436 SDValue Ops[2] = { Tmp1, Tmp2 };
15437 return DAG.getMergeValues(Ops, dl);
15441 SDValue Chain = Op.getOperand(0);
15442 SDValue Size = Op.getOperand(1);
15443 unsigned Align = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
15444 EVT VT = Op.getNode()->getValueType(0);
15446 bool Is64Bit = Subtarget->is64Bit();
15447 MVT SPTy = getPointerTy(DAG.getDataLayout());
15450 MachineRegisterInfo &MRI = MF.getRegInfo();
15453 // The 64 bit implementation of segmented stacks needs to clobber both r10
15454 // r11. This makes it impossible to use it along with nested parameters.
15455 const Function *F = MF.getFunction();
15457 for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
15459 if (I->hasNestAttr())
15460 report_fatal_error("Cannot use segmented stacks with functions that "
15461 "have nested arguments.");
15464 const TargetRegisterClass *AddrRegClass = getRegClassFor(SPTy);
15465 unsigned Vreg = MRI.createVirtualRegister(AddrRegClass);
15466 Chain = DAG.getCopyToReg(Chain, dl, Vreg, Size);
15467 SDValue Value = DAG.getNode(X86ISD::SEG_ALLOCA, dl, SPTy, Chain,
15468 DAG.getRegister(Vreg, SPTy));
15469 SDValue Ops1[2] = { Value, Chain };
15470 return DAG.getMergeValues(Ops1, dl);
15473 const unsigned Reg = (Subtarget->isTarget64BitLP64() ? X86::RAX : X86::EAX);
15475 Chain = DAG.getCopyToReg(Chain, dl, Reg, Size, Flag);
15476 Flag = Chain.getValue(1);
15477 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
15479 Chain = DAG.getNode(X86ISD::WIN_ALLOCA, dl, NodeTys, Chain, Flag);
15481 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
15482 unsigned SPReg = RegInfo->getStackRegister();
15483 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, SPTy);
15484 Chain = SP.getValue(1);
15487 SP = DAG.getNode(ISD::AND, dl, VT, SP.getValue(0),
15488 DAG.getConstant(-(uint64_t)Align, dl, VT));
15489 Chain = DAG.getCopyToReg(Chain, dl, SPReg, SP);
15492 SDValue Ops1[2] = { SP, Chain };
15493 return DAG.getMergeValues(Ops1, dl);
15497 SDValue X86TargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
15498 MachineFunction &MF = DAG.getMachineFunction();
15499 auto PtrVT = getPointerTy(MF.getDataLayout());
15500 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
15502 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
15505 if (!Subtarget->is64Bit() ||
15506 Subtarget->isCallingConvWin64(MF.getFunction()->getCallingConv())) {
15507 // vastart just stores the address of the VarArgsFrameIndex slot into the
15508 // memory location argument.
15509 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
15510 return DAG.getStore(Op.getOperand(0), DL, FR, Op.getOperand(1),
15511 MachinePointerInfo(SV), false, false, 0);
15515 // gp_offset (0 - 6 * 8)
15516 // fp_offset (48 - 48 + 8 * 16)
15517 // overflow_arg_area (point to parameters coming in memory).
15519 SmallVector<SDValue, 8> MemOps;
15520 SDValue FIN = Op.getOperand(1);
15522 SDValue Store = DAG.getStore(Op.getOperand(0), DL,
15523 DAG.getConstant(FuncInfo->getVarArgsGPOffset(),
15525 FIN, MachinePointerInfo(SV), false, false, 0);
15526 MemOps.push_back(Store);
15529 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(4, DL));
15530 Store = DAG.getStore(Op.getOperand(0), DL,
15531 DAG.getConstant(FuncInfo->getVarArgsFPOffset(), DL,
15533 FIN, MachinePointerInfo(SV, 4), false, false, 0);
15534 MemOps.push_back(Store);
15536 // Store ptr to overflow_arg_area
15537 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(4, DL));
15538 SDValue OVFIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
15539 Store = DAG.getStore(Op.getOperand(0), DL, OVFIN, FIN,
15540 MachinePointerInfo(SV, 8),
15542 MemOps.push_back(Store);
15544 // Store ptr to reg_save_area.
15545 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(
15546 Subtarget->isTarget64BitLP64() ? 8 : 4, DL));
15547 SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(), PtrVT);
15548 Store = DAG.getStore(Op.getOperand(0), DL, RSFIN, FIN, MachinePointerInfo(
15549 SV, Subtarget->isTarget64BitLP64() ? 16 : 12), false, false, 0);
15550 MemOps.push_back(Store);
15551 return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOps);
15554 SDValue X86TargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
15555 assert(Subtarget->is64Bit() &&
15556 "LowerVAARG only handles 64-bit va_arg!");
15557 assert(Op.getNode()->getNumOperands() == 4);
15559 MachineFunction &MF = DAG.getMachineFunction();
15560 if (Subtarget->isCallingConvWin64(MF.getFunction()->getCallingConv()))
15561 // The Win64 ABI uses char* instead of a structure.
15562 return DAG.expandVAArg(Op.getNode());
15564 SDValue Chain = Op.getOperand(0);
15565 SDValue SrcPtr = Op.getOperand(1);
15566 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
15567 unsigned Align = Op.getConstantOperandVal(3);
15570 EVT ArgVT = Op.getNode()->getValueType(0);
15571 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
15572 uint32_t ArgSize = DAG.getDataLayout().getTypeAllocSize(ArgTy);
15575 // Decide which area this value should be read from.
15576 // TODO: Implement the AMD64 ABI in its entirety. This simple
15577 // selection mechanism works only for the basic types.
15578 if (ArgVT == MVT::f80) {
15579 llvm_unreachable("va_arg for f80 not yet implemented");
15580 } else if (ArgVT.isFloatingPoint() && ArgSize <= 16 /*bytes*/) {
15581 ArgMode = 2; // Argument passed in XMM register. Use fp_offset.
15582 } else if (ArgVT.isInteger() && ArgSize <= 32 /*bytes*/) {
15583 ArgMode = 1; // Argument passed in GPR64 register(s). Use gp_offset.
15585 llvm_unreachable("Unhandled argument type in LowerVAARG");
15588 if (ArgMode == 2) {
15589 // Sanity Check: Make sure using fp_offset makes sense.
15590 assert(!Subtarget->useSoftFloat() &&
15591 !(MF.getFunction()->hasFnAttribute(Attribute::NoImplicitFloat)) &&
15592 Subtarget->hasSSE1());
15595 // Insert VAARG_64 node into the DAG
15596 // VAARG_64 returns two values: Variable Argument Address, Chain
15597 SDValue InstOps[] = {Chain, SrcPtr, DAG.getConstant(ArgSize, dl, MVT::i32),
15598 DAG.getConstant(ArgMode, dl, MVT::i8),
15599 DAG.getConstant(Align, dl, MVT::i32)};
15600 SDVTList VTs = DAG.getVTList(getPointerTy(DAG.getDataLayout()), MVT::Other);
15601 SDValue VAARG = DAG.getMemIntrinsicNode(X86ISD::VAARG_64, dl,
15602 VTs, InstOps, MVT::i64,
15603 MachinePointerInfo(SV),
15605 /*Volatile=*/false,
15607 /*WriteMem=*/true);
15608 Chain = VAARG.getValue(1);
15610 // Load the next argument and return it
15611 return DAG.getLoad(ArgVT, dl,
15614 MachinePointerInfo(),
15615 false, false, false, 0);
15618 static SDValue LowerVACOPY(SDValue Op, const X86Subtarget *Subtarget,
15619 SelectionDAG &DAG) {
15620 // X86-64 va_list is a struct { i32, i32, i8*, i8* }, except on Windows,
15621 // where a va_list is still an i8*.
15622 assert(Subtarget->is64Bit() && "This code only handles 64-bit va_copy!");
15623 if (Subtarget->isCallingConvWin64(
15624 DAG.getMachineFunction().getFunction()->getCallingConv()))
15625 // Probably a Win64 va_copy.
15626 return DAG.expandVACopy(Op.getNode());
15628 SDValue Chain = Op.getOperand(0);
15629 SDValue DstPtr = Op.getOperand(1);
15630 SDValue SrcPtr = Op.getOperand(2);
15631 const Value *DstSV = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
15632 const Value *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
15635 return DAG.getMemcpy(Chain, DL, DstPtr, SrcPtr,
15636 DAG.getIntPtrConstant(24, DL), 8, /*isVolatile*/false,
15638 MachinePointerInfo(DstSV), MachinePointerInfo(SrcSV));
15641 // getTargetVShiftByConstNode - Handle vector element shifts where the shift
15642 // amount is a constant. Takes immediate version of shift as input.
15643 static SDValue getTargetVShiftByConstNode(unsigned Opc, SDLoc dl, MVT VT,
15644 SDValue SrcOp, uint64_t ShiftAmt,
15645 SelectionDAG &DAG) {
15646 MVT ElementType = VT.getVectorElementType();
15648 // Fold this packed shift into its first operand if ShiftAmt is 0.
15652 // Check for ShiftAmt >= element width
15653 if (ShiftAmt >= ElementType.getSizeInBits()) {
15654 if (Opc == X86ISD::VSRAI)
15655 ShiftAmt = ElementType.getSizeInBits() - 1;
15657 return DAG.getConstant(0, dl, VT);
15660 assert((Opc == X86ISD::VSHLI || Opc == X86ISD::VSRLI || Opc == X86ISD::VSRAI)
15661 && "Unknown target vector shift-by-constant node");
15663 // Fold this packed vector shift into a build vector if SrcOp is a
15664 // vector of Constants or UNDEFs, and SrcOp valuetype is the same as VT.
15665 if (VT == SrcOp.getSimpleValueType() &&
15666 ISD::isBuildVectorOfConstantSDNodes(SrcOp.getNode())) {
15667 SmallVector<SDValue, 8> Elts;
15668 unsigned NumElts = SrcOp->getNumOperands();
15669 ConstantSDNode *ND;
15672 default: llvm_unreachable(nullptr);
15673 case X86ISD::VSHLI:
15674 for (unsigned i=0; i!=NumElts; ++i) {
15675 SDValue CurrentOp = SrcOp->getOperand(i);
15676 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15677 Elts.push_back(CurrentOp);
15680 ND = cast<ConstantSDNode>(CurrentOp);
15681 const APInt &C = ND->getAPIntValue();
15682 Elts.push_back(DAG.getConstant(C.shl(ShiftAmt), dl, ElementType));
15685 case X86ISD::VSRLI:
15686 for (unsigned i=0; i!=NumElts; ++i) {
15687 SDValue CurrentOp = SrcOp->getOperand(i);
15688 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15689 Elts.push_back(CurrentOp);
15692 ND = cast<ConstantSDNode>(CurrentOp);
15693 const APInt &C = ND->getAPIntValue();
15694 Elts.push_back(DAG.getConstant(C.lshr(ShiftAmt), dl, ElementType));
15697 case X86ISD::VSRAI:
15698 for (unsigned i=0; i!=NumElts; ++i) {
15699 SDValue CurrentOp = SrcOp->getOperand(i);
15700 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15701 Elts.push_back(CurrentOp);
15704 ND = cast<ConstantSDNode>(CurrentOp);
15705 const APInt &C = ND->getAPIntValue();
15706 Elts.push_back(DAG.getConstant(C.ashr(ShiftAmt), dl, ElementType));
15711 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Elts);
15714 return DAG.getNode(Opc, dl, VT, SrcOp,
15715 DAG.getConstant(ShiftAmt, dl, MVT::i8));
15718 // getTargetVShiftNode - Handle vector element shifts where the shift amount
15719 // may or may not be a constant. Takes immediate version of shift as input.
15720 static SDValue getTargetVShiftNode(unsigned Opc, SDLoc dl, MVT VT,
15721 SDValue SrcOp, SDValue ShAmt,
15722 SelectionDAG &DAG) {
15723 MVT SVT = ShAmt.getSimpleValueType();
15724 assert((SVT == MVT::i32 || SVT == MVT::i64) && "Unexpected value type!");
15726 // Catch shift-by-constant.
15727 if (ConstantSDNode *CShAmt = dyn_cast<ConstantSDNode>(ShAmt))
15728 return getTargetVShiftByConstNode(Opc, dl, VT, SrcOp,
15729 CShAmt->getZExtValue(), DAG);
15731 // Change opcode to non-immediate version
15733 default: llvm_unreachable("Unknown target vector shift node");
15734 case X86ISD::VSHLI: Opc = X86ISD::VSHL; break;
15735 case X86ISD::VSRLI: Opc = X86ISD::VSRL; break;
15736 case X86ISD::VSRAI: Opc = X86ISD::VSRA; break;
15739 const X86Subtarget &Subtarget =
15740 static_cast<const X86Subtarget &>(DAG.getSubtarget());
15741 if (Subtarget.hasSSE41() && ShAmt.getOpcode() == ISD::ZERO_EXTEND &&
15742 ShAmt.getOperand(0).getSimpleValueType() == MVT::i16) {
15743 // Let the shuffle legalizer expand this shift amount node.
15744 SDValue Op0 = ShAmt.getOperand(0);
15745 Op0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(Op0), MVT::v8i16, Op0);
15746 ShAmt = getShuffleVectorZeroOrUndef(Op0, 0, true, &Subtarget, DAG);
15748 // Need to build a vector containing shift amount.
15749 // SSE/AVX packed shifts only use the lower 64-bit of the shift count.
15750 SmallVector<SDValue, 4> ShOps;
15751 ShOps.push_back(ShAmt);
15752 if (SVT == MVT::i32) {
15753 ShOps.push_back(DAG.getConstant(0, dl, SVT));
15754 ShOps.push_back(DAG.getUNDEF(SVT));
15756 ShOps.push_back(DAG.getUNDEF(SVT));
15758 MVT BVT = SVT == MVT::i32 ? MVT::v4i32 : MVT::v2i64;
15759 ShAmt = DAG.getNode(ISD::BUILD_VECTOR, dl, BVT, ShOps);
15762 // The return type has to be a 128-bit type with the same element
15763 // type as the input type.
15764 MVT EltVT = VT.getVectorElementType();
15765 EVT ShVT = MVT::getVectorVT(EltVT, 128/EltVT.getSizeInBits());
15767 ShAmt = DAG.getBitcast(ShVT, ShAmt);
15768 return DAG.getNode(Opc, dl, VT, SrcOp, ShAmt);
15771 /// \brief Return (and \p Op, \p Mask) for compare instructions or
15772 /// (vselect \p Mask, \p Op, \p PreservedSrc) for others along with the
15773 /// necessary casting or extending for \p Mask when lowering masking intrinsics
15774 static SDValue getVectorMaskingNode(SDValue Op, SDValue Mask,
15775 SDValue PreservedSrc,
15776 const X86Subtarget *Subtarget,
15777 SelectionDAG &DAG) {
15778 EVT VT = Op.getValueType();
15779 EVT MaskVT = EVT::getVectorVT(*DAG.getContext(),
15780 MVT::i1, VT.getVectorNumElements());
15781 SDValue VMask = SDValue();
15782 unsigned OpcodeSelect = ISD::VSELECT;
15785 assert(MaskVT.isSimple() && "invalid mask type");
15787 if (isAllOnes(Mask))
15790 if (MaskVT.bitsGT(Mask.getValueType())) {
15791 EVT newMaskVT = EVT::getIntegerVT(*DAG.getContext(),
15792 MaskVT.getSizeInBits());
15793 VMask = DAG.getBitcast(MaskVT,
15794 DAG.getNode(ISD::ANY_EXTEND, dl, newMaskVT, Mask));
15796 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
15797 Mask.getValueType().getSizeInBits());
15798 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
15799 // are extracted by EXTRACT_SUBVECTOR.
15800 VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
15801 DAG.getBitcast(BitcastVT, Mask),
15802 DAG.getIntPtrConstant(0, dl));
15805 switch (Op.getOpcode()) {
15807 case X86ISD::PCMPEQM:
15808 case X86ISD::PCMPGTM:
15810 case X86ISD::CMPMU:
15811 return DAG.getNode(ISD::AND, dl, VT, Op, VMask);
15812 case X86ISD::VFPCLASS:
15813 return DAG.getNode(ISD::OR, dl, VT, Op, VMask);
15814 case X86ISD::VTRUNC:
15815 case X86ISD::VTRUNCS:
15816 case X86ISD::VTRUNCUS:
15817 // We can't use ISD::VSELECT here because it is not always "Legal"
15818 // for the destination type. For example vpmovqb require only AVX512
15819 // and vselect that can operate on byte element type require BWI
15820 OpcodeSelect = X86ISD::SELECT;
15823 if (PreservedSrc.getOpcode() == ISD::UNDEF)
15824 PreservedSrc = getZeroVector(VT, Subtarget, DAG, dl);
15825 return DAG.getNode(OpcodeSelect, dl, VT, VMask, Op, PreservedSrc);
15828 /// \brief Creates an SDNode for a predicated scalar operation.
15829 /// \returns (X86vselect \p Mask, \p Op, \p PreservedSrc).
15830 /// The mask is coming as MVT::i8 and it should be truncated
15831 /// to MVT::i1 while lowering masking intrinsics.
15832 /// The main difference between ScalarMaskingNode and VectorMaskingNode is using
15833 /// "X86select" instead of "vselect". We just can't create the "vselect" node
15834 /// for a scalar instruction.
15835 static SDValue getScalarMaskingNode(SDValue Op, SDValue Mask,
15836 SDValue PreservedSrc,
15837 const X86Subtarget *Subtarget,
15838 SelectionDAG &DAG) {
15839 if (isAllOnes(Mask))
15842 EVT VT = Op.getValueType();
15844 // The mask should be of type MVT::i1
15845 SDValue IMask = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, Mask);
15847 if (Op.getOpcode() == X86ISD::FSETCC)
15848 return DAG.getNode(ISD::AND, dl, VT, Op, IMask);
15850 if (PreservedSrc.getOpcode() == ISD::UNDEF)
15851 PreservedSrc = getZeroVector(VT, Subtarget, DAG, dl);
15852 return DAG.getNode(X86ISD::SELECT, dl, VT, IMask, Op, PreservedSrc);
15855 static int getSEHRegistrationNodeSize(const Function *Fn) {
15856 if (!Fn->hasPersonalityFn())
15857 report_fatal_error(
15858 "querying registration node size for function without personality");
15859 // The RegNodeSize is 6 32-bit words for SEH and 4 for C++ EH. See
15860 // WinEHStatePass for the full struct definition.
15861 switch (classifyEHPersonality(Fn->getPersonalityFn())) {
15862 case EHPersonality::MSVC_X86SEH: return 24;
15863 case EHPersonality::MSVC_CXX: return 16;
15866 report_fatal_error("can only recover FP for MSVC EH personality functions");
15869 /// When the 32-bit MSVC runtime transfers control to us, either to an outlined
15870 /// function or when returning to a parent frame after catching an exception, we
15871 /// recover the parent frame pointer by doing arithmetic on the incoming EBP.
15872 /// Here's the math:
15873 /// RegNodeBase = EntryEBP - RegNodeSize
15874 /// ParentFP = RegNodeBase - RegNodeFrameOffset
15875 /// Subtracting RegNodeSize takes us to the offset of the registration node, and
15876 /// subtracting the offset (negative on x86) takes us back to the parent FP.
15877 static SDValue recoverFramePointer(SelectionDAG &DAG, const Function *Fn,
15878 SDValue EntryEBP) {
15879 MachineFunction &MF = DAG.getMachineFunction();
15882 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
15883 MVT PtrVT = TLI.getPointerTy(DAG.getDataLayout());
15885 // It's possible that the parent function no longer has a personality function
15886 // if the exceptional code was optimized away, in which case we just return
15887 // the incoming EBP.
15888 if (!Fn->hasPersonalityFn())
15891 int RegNodeSize = getSEHRegistrationNodeSize(Fn);
15893 // Get an MCSymbol that will ultimately resolve to the frame offset of the EH
15895 MCSymbol *OffsetSym =
15896 MF.getMMI().getContext().getOrCreateParentFrameOffsetSymbol(
15897 GlobalValue::getRealLinkageName(Fn->getName()));
15898 SDValue OffsetSymVal = DAG.getMCSymbol(OffsetSym, PtrVT);
15899 SDValue RegNodeFrameOffset =
15900 DAG.getNode(ISD::LOCAL_RECOVER, dl, PtrVT, OffsetSymVal);
15902 // RegNodeBase = EntryEBP - RegNodeSize
15903 // ParentFP = RegNodeBase - RegNodeFrameOffset
15904 SDValue RegNodeBase = DAG.getNode(ISD::SUB, dl, PtrVT, EntryEBP,
15905 DAG.getConstant(RegNodeSize, dl, PtrVT));
15906 return DAG.getNode(ISD::SUB, dl, PtrVT, RegNodeBase, RegNodeFrameOffset);
15909 static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, const X86Subtarget *Subtarget,
15910 SelectionDAG &DAG) {
15912 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
15913 EVT VT = Op.getValueType();
15914 const IntrinsicData* IntrData = getIntrinsicWithoutChain(IntNo);
15916 switch(IntrData->Type) {
15917 case INTR_TYPE_1OP:
15918 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1));
15919 case INTR_TYPE_2OP:
15920 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
15922 case INTR_TYPE_2OP_IMM8:
15923 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
15924 DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op.getOperand(2)));
15925 case INTR_TYPE_3OP:
15926 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
15927 Op.getOperand(2), Op.getOperand(3));
15928 case INTR_TYPE_4OP:
15929 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
15930 Op.getOperand(2), Op.getOperand(3), Op.getOperand(4));
15931 case INTR_TYPE_1OP_MASK_RM: {
15932 SDValue Src = Op.getOperand(1);
15933 SDValue PassThru = Op.getOperand(2);
15934 SDValue Mask = Op.getOperand(3);
15935 SDValue RoundingMode;
15936 // We allways add rounding mode to the Node.
15937 // If the rounding mode is not specified, we add the
15938 // "current direction" mode.
15939 if (Op.getNumOperands() == 4)
15941 DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
15943 RoundingMode = Op.getOperand(4);
15944 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
15945 if (IntrWithRoundingModeOpcode != 0)
15946 if (cast<ConstantSDNode>(RoundingMode)->getZExtValue() !=
15947 X86::STATIC_ROUNDING::CUR_DIRECTION)
15948 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
15949 dl, Op.getValueType(), Src, RoundingMode),
15950 Mask, PassThru, Subtarget, DAG);
15951 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src,
15953 Mask, PassThru, Subtarget, DAG);
15955 case INTR_TYPE_1OP_MASK: {
15956 SDValue Src = Op.getOperand(1);
15957 SDValue PassThru = Op.getOperand(2);
15958 SDValue Mask = Op.getOperand(3);
15959 // We add rounding mode to the Node when
15960 // - RM Opcode is specified and
15961 // - RM is not "current direction".
15962 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
15963 if (IntrWithRoundingModeOpcode != 0) {
15964 SDValue Rnd = Op.getOperand(4);
15965 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
15966 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
15967 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
15968 dl, Op.getValueType(),
15970 Mask, PassThru, Subtarget, DAG);
15973 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src),
15974 Mask, PassThru, Subtarget, DAG);
15976 case INTR_TYPE_SCALAR_MASK: {
15977 SDValue Src1 = Op.getOperand(1);
15978 SDValue Src2 = Op.getOperand(2);
15979 SDValue passThru = Op.getOperand(3);
15980 SDValue Mask = Op.getOperand(4);
15981 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1, Src2),
15982 Mask, passThru, Subtarget, DAG);
15984 case INTR_TYPE_SCALAR_MASK_RM: {
15985 SDValue Src1 = Op.getOperand(1);
15986 SDValue Src2 = Op.getOperand(2);
15987 SDValue Src0 = Op.getOperand(3);
15988 SDValue Mask = Op.getOperand(4);
15989 // There are 2 kinds of intrinsics in this group:
15990 // (1) With suppress-all-exceptions (sae) or rounding mode- 6 operands
15991 // (2) With rounding mode and sae - 7 operands.
15992 if (Op.getNumOperands() == 6) {
15993 SDValue Sae = Op.getOperand(5);
15994 unsigned Opc = IntrData->Opc1 ? IntrData->Opc1 : IntrData->Opc0;
15995 return getScalarMaskingNode(DAG.getNode(Opc, dl, VT, Src1, Src2,
15997 Mask, Src0, Subtarget, DAG);
15999 assert(Op.getNumOperands() == 7 && "Unexpected intrinsic form");
16000 SDValue RoundingMode = Op.getOperand(5);
16001 SDValue Sae = Op.getOperand(6);
16002 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1, Src2,
16003 RoundingMode, Sae),
16004 Mask, Src0, Subtarget, DAG);
16006 case INTR_TYPE_2OP_MASK:
16007 case INTR_TYPE_2OP_IMM8_MASK: {
16008 SDValue Src1 = Op.getOperand(1);
16009 SDValue Src2 = Op.getOperand(2);
16010 SDValue PassThru = Op.getOperand(3);
16011 SDValue Mask = Op.getOperand(4);
16013 if (IntrData->Type == INTR_TYPE_2OP_IMM8_MASK)
16014 Src2 = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Src2);
16016 // We specify 2 possible opcodes for intrinsics with rounding modes.
16017 // First, we check if the intrinsic may have non-default rounding mode,
16018 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16019 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16020 if (IntrWithRoundingModeOpcode != 0) {
16021 SDValue Rnd = Op.getOperand(5);
16022 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
16023 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
16024 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16025 dl, Op.getValueType(),
16027 Mask, PassThru, Subtarget, DAG);
16030 // TODO: Intrinsics should have fast-math-flags to propagate.
16031 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,Src1,Src2),
16032 Mask, PassThru, Subtarget, DAG);
16034 case INTR_TYPE_2OP_MASK_RM: {
16035 SDValue Src1 = Op.getOperand(1);
16036 SDValue Src2 = Op.getOperand(2);
16037 SDValue PassThru = Op.getOperand(3);
16038 SDValue Mask = Op.getOperand(4);
16039 // We specify 2 possible modes for intrinsics, with/without rounding
16041 // First, we check if the intrinsic have rounding mode (6 operands),
16042 // if not, we set rounding mode to "current".
16044 if (Op.getNumOperands() == 6)
16045 Rnd = Op.getOperand(5);
16047 Rnd = DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
16048 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16050 Mask, PassThru, Subtarget, DAG);
16052 case INTR_TYPE_3OP_SCALAR_MASK_RM: {
16053 SDValue Src1 = Op.getOperand(1);
16054 SDValue Src2 = Op.getOperand(2);
16055 SDValue Src3 = Op.getOperand(3);
16056 SDValue PassThru = Op.getOperand(4);
16057 SDValue Mask = Op.getOperand(5);
16058 SDValue Sae = Op.getOperand(6);
16060 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1,
16062 Mask, PassThru, Subtarget, DAG);
16064 case INTR_TYPE_3OP_MASK_RM: {
16065 SDValue Src1 = Op.getOperand(1);
16066 SDValue Src2 = Op.getOperand(2);
16067 SDValue Imm = Op.getOperand(3);
16068 SDValue PassThru = Op.getOperand(4);
16069 SDValue Mask = Op.getOperand(5);
16070 // We specify 2 possible modes for intrinsics, with/without rounding
16072 // First, we check if the intrinsic have rounding mode (7 operands),
16073 // if not, we set rounding mode to "current".
16075 if (Op.getNumOperands() == 7)
16076 Rnd = Op.getOperand(6);
16078 Rnd = DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
16079 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16080 Src1, Src2, Imm, Rnd),
16081 Mask, PassThru, Subtarget, DAG);
16083 case INTR_TYPE_3OP_IMM8_MASK:
16084 case INTR_TYPE_3OP_MASK:
16085 case INSERT_SUBVEC: {
16086 SDValue Src1 = Op.getOperand(1);
16087 SDValue Src2 = Op.getOperand(2);
16088 SDValue Src3 = Op.getOperand(3);
16089 SDValue PassThru = Op.getOperand(4);
16090 SDValue Mask = Op.getOperand(5);
16092 if (IntrData->Type == INTR_TYPE_3OP_IMM8_MASK)
16093 Src3 = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Src3);
16094 else if (IntrData->Type == INSERT_SUBVEC) {
16095 // imm should be adapted to ISD::INSERT_SUBVECTOR behavior
16096 assert(isa<ConstantSDNode>(Src3) && "Expected a ConstantSDNode here!");
16097 unsigned Imm = cast<ConstantSDNode>(Src3)->getZExtValue();
16098 Imm *= Src2.getValueType().getVectorNumElements();
16099 Src3 = DAG.getTargetConstant(Imm, dl, MVT::i32);
16102 // We specify 2 possible opcodes for intrinsics with rounding modes.
16103 // First, we check if the intrinsic may have non-default rounding mode,
16104 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16105 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16106 if (IntrWithRoundingModeOpcode != 0) {
16107 SDValue Rnd = Op.getOperand(6);
16108 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
16109 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
16110 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16111 dl, Op.getValueType(),
16112 Src1, Src2, Src3, Rnd),
16113 Mask, PassThru, Subtarget, DAG);
16116 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16118 Mask, PassThru, Subtarget, DAG);
16120 case VPERM_3OP_MASKZ:
16121 case VPERM_3OP_MASK:
16124 case FMA_OP_MASK: {
16125 SDValue Src1 = Op.getOperand(1);
16126 SDValue Src2 = Op.getOperand(2);
16127 SDValue Src3 = Op.getOperand(3);
16128 SDValue Mask = Op.getOperand(4);
16129 EVT VT = Op.getValueType();
16130 SDValue PassThru = SDValue();
16132 // set PassThru element
16133 if (IntrData->Type == VPERM_3OP_MASKZ || IntrData->Type == FMA_OP_MASKZ)
16134 PassThru = getZeroVector(VT, Subtarget, DAG, dl);
16135 else if (IntrData->Type == FMA_OP_MASK3)
16140 // We specify 2 possible opcodes for intrinsics with rounding modes.
16141 // First, we check if the intrinsic may have non-default rounding mode,
16142 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16143 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16144 if (IntrWithRoundingModeOpcode != 0) {
16145 SDValue Rnd = Op.getOperand(5);
16146 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16147 X86::STATIC_ROUNDING::CUR_DIRECTION)
16148 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16149 dl, Op.getValueType(),
16150 Src1, Src2, Src3, Rnd),
16151 Mask, PassThru, Subtarget, DAG);
16153 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0,
16154 dl, Op.getValueType(),
16156 Mask, PassThru, Subtarget, DAG);
16159 // FPclass intrinsics with mask
16160 SDValue Src1 = Op.getOperand(1);
16161 EVT VT = Src1.getValueType();
16162 EVT MaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16163 VT.getVectorNumElements());
16164 SDValue Imm = Op.getOperand(2);
16165 SDValue Mask = Op.getOperand(3);
16166 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16167 Mask.getValueType().getSizeInBits());
16168 SDValue FPclass = DAG.getNode(IntrData->Opc0, dl, MaskVT, Src1, Imm);
16169 SDValue FPclassMask = getVectorMaskingNode(FPclass, Mask,
16170 DAG.getTargetConstant(0, dl, MaskVT),
16172 SDValue Res = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, BitcastVT,
16173 DAG.getUNDEF(BitcastVT), FPclassMask,
16174 DAG.getIntPtrConstant(0, dl));
16175 return DAG.getBitcast(Op.getValueType(), Res);
16178 case CMP_MASK_CC: {
16179 // Comparison intrinsics with masks.
16180 // Example of transformation:
16181 // (i8 (int_x86_avx512_mask_pcmpeq_q_128
16182 // (v2i64 %a), (v2i64 %b), (i8 %mask))) ->
16184 // (v8i1 (insert_subvector undef,
16185 // (v2i1 (and (PCMPEQM %a, %b),
16186 // (extract_subvector
16187 // (v8i1 (bitcast %mask)), 0))), 0))))
16188 EVT VT = Op.getOperand(1).getValueType();
16189 EVT MaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16190 VT.getVectorNumElements());
16191 SDValue Mask = Op.getOperand((IntrData->Type == CMP_MASK_CC) ? 4 : 3);
16192 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16193 Mask.getValueType().getSizeInBits());
16195 if (IntrData->Type == CMP_MASK_CC) {
16196 SDValue CC = Op.getOperand(3);
16197 CC = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, CC);
16198 // We specify 2 possible opcodes for intrinsics with rounding modes.
16199 // First, we check if the intrinsic may have non-default rounding mode,
16200 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16201 if (IntrData->Opc1 != 0) {
16202 SDValue Rnd = Op.getOperand(5);
16203 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16204 X86::STATIC_ROUNDING::CUR_DIRECTION)
16205 Cmp = DAG.getNode(IntrData->Opc1, dl, MaskVT, Op.getOperand(1),
16206 Op.getOperand(2), CC, Rnd);
16208 //default rounding mode
16210 Cmp = DAG.getNode(IntrData->Opc0, dl, MaskVT, Op.getOperand(1),
16211 Op.getOperand(2), CC);
16214 assert(IntrData->Type == CMP_MASK && "Unexpected intrinsic type!");
16215 Cmp = DAG.getNode(IntrData->Opc0, dl, MaskVT, Op.getOperand(1),
16218 SDValue CmpMask = getVectorMaskingNode(Cmp, Mask,
16219 DAG.getTargetConstant(0, dl,
16222 SDValue Res = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, BitcastVT,
16223 DAG.getUNDEF(BitcastVT), CmpMask,
16224 DAG.getIntPtrConstant(0, dl));
16225 return DAG.getBitcast(Op.getValueType(), Res);
16227 case CMP_MASK_SCALAR_CC: {
16228 SDValue Src1 = Op.getOperand(1);
16229 SDValue Src2 = Op.getOperand(2);
16230 SDValue CC = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op.getOperand(3));
16231 SDValue Mask = Op.getOperand(4);
16234 if (IntrData->Opc1 != 0) {
16235 SDValue Rnd = Op.getOperand(5);
16236 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16237 X86::STATIC_ROUNDING::CUR_DIRECTION)
16238 Cmp = DAG.getNode(IntrData->Opc1, dl, MVT::i1, Src1, Src2, CC, Rnd);
16240 //default rounding mode
16242 Cmp = DAG.getNode(IntrData->Opc0, dl, MVT::i1, Src1, Src2, CC);
16244 SDValue CmpMask = getScalarMaskingNode(Cmp, Mask,
16245 DAG.getTargetConstant(0, dl,
16249 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, MVT::i8,
16250 DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i8, CmpMask),
16251 DAG.getValueType(MVT::i1));
16253 case COMI: { // Comparison intrinsics
16254 ISD::CondCode CC = (ISD::CondCode)IntrData->Opc1;
16255 SDValue LHS = Op.getOperand(1);
16256 SDValue RHS = Op.getOperand(2);
16257 unsigned X86CC = TranslateX86CC(CC, dl, true, LHS, RHS, DAG);
16258 assert(X86CC != X86::COND_INVALID && "Unexpected illegal condition!");
16259 SDValue Cond = DAG.getNode(IntrData->Opc0, dl, MVT::i32, LHS, RHS);
16260 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16261 DAG.getConstant(X86CC, dl, MVT::i8), Cond);
16262 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16265 return getTargetVShiftNode(IntrData->Opc0, dl, Op.getSimpleValueType(),
16266 Op.getOperand(1), Op.getOperand(2), DAG);
16268 return getVectorMaskingNode(getTargetVShiftNode(IntrData->Opc0, dl,
16269 Op.getSimpleValueType(),
16271 Op.getOperand(2), DAG),
16272 Op.getOperand(4), Op.getOperand(3), Subtarget,
16274 case COMPRESS_EXPAND_IN_REG: {
16275 SDValue Mask = Op.getOperand(3);
16276 SDValue DataToCompress = Op.getOperand(1);
16277 SDValue PassThru = Op.getOperand(2);
16278 if (isAllOnes(Mask)) // return data as is
16279 return Op.getOperand(1);
16281 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16283 Mask, PassThru, Subtarget, DAG);
16286 SDValue Mask = Op.getOperand(3);
16287 EVT VT = Op.getValueType();
16288 EVT MaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16289 VT.getVectorNumElements());
16290 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16291 Mask.getValueType().getSizeInBits());
16293 SDValue VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16294 DAG.getBitcast(BitcastVT, Mask),
16295 DAG.getIntPtrConstant(0, dl));
16296 return DAG.getNode(IntrData->Opc0, dl, VT, VMask, Op.getOperand(1),
16305 default: return SDValue(); // Don't custom lower most intrinsics.
16307 case Intrinsic::x86_avx2_permd:
16308 case Intrinsic::x86_avx2_permps:
16309 // Operands intentionally swapped. Mask is last operand to intrinsic,
16310 // but second operand for node/instruction.
16311 return DAG.getNode(X86ISD::VPERMV, dl, Op.getValueType(),
16312 Op.getOperand(2), Op.getOperand(1));
16314 // ptest and testp intrinsics. The intrinsic these come from are designed to
16315 // return an integer value, not just an instruction so lower it to the ptest
16316 // or testp pattern and a setcc for the result.
16317 case Intrinsic::x86_sse41_ptestz:
16318 case Intrinsic::x86_sse41_ptestc:
16319 case Intrinsic::x86_sse41_ptestnzc:
16320 case Intrinsic::x86_avx_ptestz_256:
16321 case Intrinsic::x86_avx_ptestc_256:
16322 case Intrinsic::x86_avx_ptestnzc_256:
16323 case Intrinsic::x86_avx_vtestz_ps:
16324 case Intrinsic::x86_avx_vtestc_ps:
16325 case Intrinsic::x86_avx_vtestnzc_ps:
16326 case Intrinsic::x86_avx_vtestz_pd:
16327 case Intrinsic::x86_avx_vtestc_pd:
16328 case Intrinsic::x86_avx_vtestnzc_pd:
16329 case Intrinsic::x86_avx_vtestz_ps_256:
16330 case Intrinsic::x86_avx_vtestc_ps_256:
16331 case Intrinsic::x86_avx_vtestnzc_ps_256:
16332 case Intrinsic::x86_avx_vtestz_pd_256:
16333 case Intrinsic::x86_avx_vtestc_pd_256:
16334 case Intrinsic::x86_avx_vtestnzc_pd_256: {
16335 bool IsTestPacked = false;
16338 default: llvm_unreachable("Bad fallthrough in Intrinsic lowering.");
16339 case Intrinsic::x86_avx_vtestz_ps:
16340 case Intrinsic::x86_avx_vtestz_pd:
16341 case Intrinsic::x86_avx_vtestz_ps_256:
16342 case Intrinsic::x86_avx_vtestz_pd_256:
16343 IsTestPacked = true; // Fallthrough
16344 case Intrinsic::x86_sse41_ptestz:
16345 case Intrinsic::x86_avx_ptestz_256:
16347 X86CC = X86::COND_E;
16349 case Intrinsic::x86_avx_vtestc_ps:
16350 case Intrinsic::x86_avx_vtestc_pd:
16351 case Intrinsic::x86_avx_vtestc_ps_256:
16352 case Intrinsic::x86_avx_vtestc_pd_256:
16353 IsTestPacked = true; // Fallthrough
16354 case Intrinsic::x86_sse41_ptestc:
16355 case Intrinsic::x86_avx_ptestc_256:
16357 X86CC = X86::COND_B;
16359 case Intrinsic::x86_avx_vtestnzc_ps:
16360 case Intrinsic::x86_avx_vtestnzc_pd:
16361 case Intrinsic::x86_avx_vtestnzc_ps_256:
16362 case Intrinsic::x86_avx_vtestnzc_pd_256:
16363 IsTestPacked = true; // Fallthrough
16364 case Intrinsic::x86_sse41_ptestnzc:
16365 case Intrinsic::x86_avx_ptestnzc_256:
16367 X86CC = X86::COND_A;
16371 SDValue LHS = Op.getOperand(1);
16372 SDValue RHS = Op.getOperand(2);
16373 unsigned TestOpc = IsTestPacked ? X86ISD::TESTP : X86ISD::PTEST;
16374 SDValue Test = DAG.getNode(TestOpc, dl, MVT::i32, LHS, RHS);
16375 SDValue CC = DAG.getConstant(X86CC, dl, MVT::i8);
16376 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8, CC, Test);
16377 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16379 case Intrinsic::x86_avx512_kortestz_w:
16380 case Intrinsic::x86_avx512_kortestc_w: {
16381 unsigned X86CC = (IntNo == Intrinsic::x86_avx512_kortestz_w)? X86::COND_E: X86::COND_B;
16382 SDValue LHS = DAG.getBitcast(MVT::v16i1, Op.getOperand(1));
16383 SDValue RHS = DAG.getBitcast(MVT::v16i1, Op.getOperand(2));
16384 SDValue CC = DAG.getConstant(X86CC, dl, MVT::i8);
16385 SDValue Test = DAG.getNode(X86ISD::KORTEST, dl, MVT::i32, LHS, RHS);
16386 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i1, CC, Test);
16387 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16390 case Intrinsic::x86_sse42_pcmpistria128:
16391 case Intrinsic::x86_sse42_pcmpestria128:
16392 case Intrinsic::x86_sse42_pcmpistric128:
16393 case Intrinsic::x86_sse42_pcmpestric128:
16394 case Intrinsic::x86_sse42_pcmpistrio128:
16395 case Intrinsic::x86_sse42_pcmpestrio128:
16396 case Intrinsic::x86_sse42_pcmpistris128:
16397 case Intrinsic::x86_sse42_pcmpestris128:
16398 case Intrinsic::x86_sse42_pcmpistriz128:
16399 case Intrinsic::x86_sse42_pcmpestriz128: {
16403 default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
16404 case Intrinsic::x86_sse42_pcmpistria128:
16405 Opcode = X86ISD::PCMPISTRI;
16406 X86CC = X86::COND_A;
16408 case Intrinsic::x86_sse42_pcmpestria128:
16409 Opcode = X86ISD::PCMPESTRI;
16410 X86CC = X86::COND_A;
16412 case Intrinsic::x86_sse42_pcmpistric128:
16413 Opcode = X86ISD::PCMPISTRI;
16414 X86CC = X86::COND_B;
16416 case Intrinsic::x86_sse42_pcmpestric128:
16417 Opcode = X86ISD::PCMPESTRI;
16418 X86CC = X86::COND_B;
16420 case Intrinsic::x86_sse42_pcmpistrio128:
16421 Opcode = X86ISD::PCMPISTRI;
16422 X86CC = X86::COND_O;
16424 case Intrinsic::x86_sse42_pcmpestrio128:
16425 Opcode = X86ISD::PCMPESTRI;
16426 X86CC = X86::COND_O;
16428 case Intrinsic::x86_sse42_pcmpistris128:
16429 Opcode = X86ISD::PCMPISTRI;
16430 X86CC = X86::COND_S;
16432 case Intrinsic::x86_sse42_pcmpestris128:
16433 Opcode = X86ISD::PCMPESTRI;
16434 X86CC = X86::COND_S;
16436 case Intrinsic::x86_sse42_pcmpistriz128:
16437 Opcode = X86ISD::PCMPISTRI;
16438 X86CC = X86::COND_E;
16440 case Intrinsic::x86_sse42_pcmpestriz128:
16441 Opcode = X86ISD::PCMPESTRI;
16442 X86CC = X86::COND_E;
16445 SmallVector<SDValue, 5> NewOps(Op->op_begin()+1, Op->op_end());
16446 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
16447 SDValue PCMP = DAG.getNode(Opcode, dl, VTs, NewOps);
16448 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16449 DAG.getConstant(X86CC, dl, MVT::i8),
16450 SDValue(PCMP.getNode(), 1));
16451 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16454 case Intrinsic::x86_sse42_pcmpistri128:
16455 case Intrinsic::x86_sse42_pcmpestri128: {
16457 if (IntNo == Intrinsic::x86_sse42_pcmpistri128)
16458 Opcode = X86ISD::PCMPISTRI;
16460 Opcode = X86ISD::PCMPESTRI;
16462 SmallVector<SDValue, 5> NewOps(Op->op_begin()+1, Op->op_end());
16463 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
16464 return DAG.getNode(Opcode, dl, VTs, NewOps);
16467 case Intrinsic::x86_seh_lsda: {
16468 // Compute the symbol for the LSDA. We know it'll get emitted later.
16469 MachineFunction &MF = DAG.getMachineFunction();
16470 SDValue Op1 = Op.getOperand(1);
16471 auto *Fn = cast<Function>(cast<GlobalAddressSDNode>(Op1)->getGlobal());
16472 MCSymbol *LSDASym = MF.getMMI().getContext().getOrCreateLSDASymbol(
16473 GlobalValue::getRealLinkageName(Fn->getName()));
16475 // Generate a simple absolute symbol reference. This intrinsic is only
16476 // supported on 32-bit Windows, which isn't PIC.
16477 SDValue Result = DAG.getMCSymbol(LSDASym, VT);
16478 return DAG.getNode(X86ISD::Wrapper, dl, VT, Result);
16481 case Intrinsic::x86_seh_recoverfp: {
16482 SDValue FnOp = Op.getOperand(1);
16483 SDValue IncomingFPOp = Op.getOperand(2);
16484 GlobalAddressSDNode *GSD = dyn_cast<GlobalAddressSDNode>(FnOp);
16485 auto *Fn = dyn_cast_or_null<Function>(GSD ? GSD->getGlobal() : nullptr);
16487 report_fatal_error(
16488 "llvm.x86.seh.recoverfp must take a function as the first argument");
16489 return recoverFramePointer(DAG, Fn, IncomingFPOp);
16492 case Intrinsic::localaddress: {
16493 // Returns one of the stack, base, or frame pointer registers, depending on
16494 // which is used to reference local variables.
16495 MachineFunction &MF = DAG.getMachineFunction();
16496 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
16498 if (RegInfo->hasBasePointer(MF))
16499 Reg = RegInfo->getBaseRegister();
16500 else // This function handles the SP or FP case.
16501 Reg = RegInfo->getPtrSizedFrameRegister(MF);
16502 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
16507 static SDValue getGatherNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16508 SDValue Src, SDValue Mask, SDValue Base,
16509 SDValue Index, SDValue ScaleOp, SDValue Chain,
16510 const X86Subtarget * Subtarget) {
16512 ConstantSDNode *C = dyn_cast<ConstantSDNode>(ScaleOp);
16514 llvm_unreachable("Invalid scale type");
16515 unsigned ScaleVal = C->getZExtValue();
16516 if (ScaleVal > 2 && ScaleVal != 4 && ScaleVal != 8)
16517 llvm_unreachable("Valid scale values are 1, 2, 4, 8");
16519 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16520 EVT MaskVT = MVT::getVectorVT(MVT::i1,
16521 Index.getSimpleValueType().getVectorNumElements());
16523 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16525 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16527 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16528 Mask.getValueType().getSizeInBits());
16530 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16531 // are extracted by EXTRACT_SUBVECTOR.
16532 MaskInReg = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16533 DAG.getBitcast(BitcastVT, Mask),
16534 DAG.getIntPtrConstant(0, dl));
16536 SDVTList VTs = DAG.getVTList(Op.getValueType(), MaskVT, MVT::Other);
16537 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16538 SDValue Segment = DAG.getRegister(0, MVT::i32);
16539 if (Src.getOpcode() == ISD::UNDEF)
16540 Src = getZeroVector(Op.getValueType(), Subtarget, DAG, dl);
16541 SDValue Ops[] = {Src, MaskInReg, Base, Scale, Index, Disp, Segment, Chain};
16542 SDNode *Res = DAG.getMachineNode(Opc, dl, VTs, Ops);
16543 SDValue RetOps[] = { SDValue(Res, 0), SDValue(Res, 2) };
16544 return DAG.getMergeValues(RetOps, dl);
16547 static SDValue getScatterNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16548 SDValue Src, SDValue Mask, SDValue Base,
16549 SDValue Index, SDValue ScaleOp, SDValue Chain) {
16551 ConstantSDNode *C = dyn_cast<ConstantSDNode>(ScaleOp);
16553 llvm_unreachable("Invalid scale type");
16554 unsigned ScaleVal = C->getZExtValue();
16555 if (ScaleVal > 2 && ScaleVal != 4 && ScaleVal != 8)
16556 llvm_unreachable("Valid scale values are 1, 2, 4, 8");
16558 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16559 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16560 SDValue Segment = DAG.getRegister(0, MVT::i32);
16561 EVT MaskVT = MVT::getVectorVT(MVT::i1,
16562 Index.getSimpleValueType().getVectorNumElements());
16564 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16566 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16568 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16569 Mask.getValueType().getSizeInBits());
16571 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16572 // are extracted by EXTRACT_SUBVECTOR.
16573 MaskInReg = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16574 DAG.getBitcast(BitcastVT, Mask),
16575 DAG.getIntPtrConstant(0, dl));
16577 SDVTList VTs = DAG.getVTList(MaskVT, MVT::Other);
16578 SDValue Ops[] = {Base, Scale, Index, Disp, Segment, MaskInReg, Src, Chain};
16579 SDNode *Res = DAG.getMachineNode(Opc, dl, VTs, Ops);
16580 return SDValue(Res, 1);
16583 static SDValue getPrefetchNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16584 SDValue Mask, SDValue Base, SDValue Index,
16585 SDValue ScaleOp, SDValue Chain) {
16587 ConstantSDNode *C = dyn_cast<ConstantSDNode>(ScaleOp);
16588 assert(C && "Invalid scale type");
16589 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16590 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16591 SDValue Segment = DAG.getRegister(0, MVT::i32);
16593 MVT::getVectorVT(MVT::i1, Index.getSimpleValueType().getVectorNumElements());
16595 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16597 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16599 MaskInReg = DAG.getBitcast(MaskVT, Mask);
16600 //SDVTList VTs = DAG.getVTList(MVT::Other);
16601 SDValue Ops[] = {MaskInReg, Base, Scale, Index, Disp, Segment, Chain};
16602 SDNode *Res = DAG.getMachineNode(Opc, dl, MVT::Other, Ops);
16603 return SDValue(Res, 0);
16606 // getReadPerformanceCounter - Handles the lowering of builtin intrinsics that
16607 // read performance monitor counters (x86_rdpmc).
16608 static void getReadPerformanceCounter(SDNode *N, SDLoc DL,
16609 SelectionDAG &DAG, const X86Subtarget *Subtarget,
16610 SmallVectorImpl<SDValue> &Results) {
16611 assert(N->getNumOperands() == 3 && "Unexpected number of operands!");
16612 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
16615 // The ECX register is used to select the index of the performance counter
16617 SDValue Chain = DAG.getCopyToReg(N->getOperand(0), DL, X86::ECX,
16619 SDValue rd = DAG.getNode(X86ISD::RDPMC_DAG, DL, Tys, Chain);
16621 // Reads the content of a 64-bit performance counter and returns it in the
16622 // registers EDX:EAX.
16623 if (Subtarget->is64Bit()) {
16624 LO = DAG.getCopyFromReg(rd, DL, X86::RAX, MVT::i64, rd.getValue(1));
16625 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::RDX, MVT::i64,
16628 LO = DAG.getCopyFromReg(rd, DL, X86::EAX, MVT::i32, rd.getValue(1));
16629 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::EDX, MVT::i32,
16632 Chain = HI.getValue(1);
16634 if (Subtarget->is64Bit()) {
16635 // The EAX register is loaded with the low-order 32 bits. The EDX register
16636 // is loaded with the supported high-order bits of the counter.
16637 SDValue Tmp = DAG.getNode(ISD::SHL, DL, MVT::i64, HI,
16638 DAG.getConstant(32, DL, MVT::i8));
16639 Results.push_back(DAG.getNode(ISD::OR, DL, MVT::i64, LO, Tmp));
16640 Results.push_back(Chain);
16644 // Use a buildpair to merge the two 32-bit values into a 64-bit one.
16645 SDValue Ops[] = { LO, HI };
16646 SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Ops);
16647 Results.push_back(Pair);
16648 Results.push_back(Chain);
16651 // getReadTimeStampCounter - Handles the lowering of builtin intrinsics that
16652 // read the time stamp counter (x86_rdtsc and x86_rdtscp). This function is
16653 // also used to custom lower READCYCLECOUNTER nodes.
16654 static void getReadTimeStampCounter(SDNode *N, SDLoc DL, unsigned Opcode,
16655 SelectionDAG &DAG, const X86Subtarget *Subtarget,
16656 SmallVectorImpl<SDValue> &Results) {
16657 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
16658 SDValue rd = DAG.getNode(Opcode, DL, Tys, N->getOperand(0));
16661 // The processor's time-stamp counter (a 64-bit MSR) is stored into the
16662 // EDX:EAX registers. EDX is loaded with the high-order 32 bits of the MSR
16663 // and the EAX register is loaded with the low-order 32 bits.
16664 if (Subtarget->is64Bit()) {
16665 LO = DAG.getCopyFromReg(rd, DL, X86::RAX, MVT::i64, rd.getValue(1));
16666 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::RDX, MVT::i64,
16669 LO = DAG.getCopyFromReg(rd, DL, X86::EAX, MVT::i32, rd.getValue(1));
16670 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::EDX, MVT::i32,
16673 SDValue Chain = HI.getValue(1);
16675 if (Opcode == X86ISD::RDTSCP_DAG) {
16676 assert(N->getNumOperands() == 3 && "Unexpected number of operands!");
16678 // Instruction RDTSCP loads the IA32:TSC_AUX_MSR (address C000_0103H) into
16679 // the ECX register. Add 'ecx' explicitly to the chain.
16680 SDValue ecx = DAG.getCopyFromReg(Chain, DL, X86::ECX, MVT::i32,
16682 // Explicitly store the content of ECX at the location passed in input
16683 // to the 'rdtscp' intrinsic.
16684 Chain = DAG.getStore(ecx.getValue(1), DL, ecx, N->getOperand(2),
16685 MachinePointerInfo(), false, false, 0);
16688 if (Subtarget->is64Bit()) {
16689 // The EDX register is loaded with the high-order 32 bits of the MSR, and
16690 // the EAX register is loaded with the low-order 32 bits.
16691 SDValue Tmp = DAG.getNode(ISD::SHL, DL, MVT::i64, HI,
16692 DAG.getConstant(32, DL, MVT::i8));
16693 Results.push_back(DAG.getNode(ISD::OR, DL, MVT::i64, LO, Tmp));
16694 Results.push_back(Chain);
16698 // Use a buildpair to merge the two 32-bit values into a 64-bit one.
16699 SDValue Ops[] = { LO, HI };
16700 SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Ops);
16701 Results.push_back(Pair);
16702 Results.push_back(Chain);
16705 static SDValue LowerREADCYCLECOUNTER(SDValue Op, const X86Subtarget *Subtarget,
16706 SelectionDAG &DAG) {
16707 SmallVector<SDValue, 2> Results;
16709 getReadTimeStampCounter(Op.getNode(), DL, X86ISD::RDTSC_DAG, DAG, Subtarget,
16711 return DAG.getMergeValues(Results, DL);
16714 static SDValue LowerSEHRESTOREFRAME(SDValue Op, const X86Subtarget *Subtarget,
16715 SelectionDAG &DAG) {
16716 MachineFunction &MF = DAG.getMachineFunction();
16717 const Function *Fn = MF.getFunction();
16719 SDValue Chain = Op.getOperand(0);
16721 assert(Subtarget->getFrameLowering()->hasFP(MF) &&
16722 "using llvm.x86.seh.restoreframe requires a frame pointer");
16724 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
16725 MVT VT = TLI.getPointerTy(DAG.getDataLayout());
16727 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
16728 unsigned FrameReg =
16729 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
16730 unsigned SPReg = RegInfo->getStackRegister();
16731 unsigned SlotSize = RegInfo->getSlotSize();
16733 // Get incoming EBP.
16734 SDValue IncomingEBP =
16735 DAG.getCopyFromReg(Chain, dl, FrameReg, VT);
16737 // SP is saved in the first field of every registration node, so load
16738 // [EBP-RegNodeSize] into SP.
16739 int RegNodeSize = getSEHRegistrationNodeSize(Fn);
16740 SDValue SPAddr = DAG.getNode(ISD::ADD, dl, VT, IncomingEBP,
16741 DAG.getConstant(-RegNodeSize, dl, VT));
16743 DAG.getLoad(VT, dl, Chain, SPAddr, MachinePointerInfo(), false, false,
16744 false, VT.getScalarSizeInBits() / 8);
16745 Chain = DAG.getCopyToReg(Chain, dl, SPReg, NewSP);
16747 if (!RegInfo->needsStackRealignment(MF)) {
16748 // Adjust EBP to point back to the original frame position.
16749 SDValue NewFP = recoverFramePointer(DAG, Fn, IncomingEBP);
16750 Chain = DAG.getCopyToReg(Chain, dl, FrameReg, NewFP);
16752 assert(RegInfo->hasBasePointer(MF) &&
16753 "functions with Win32 EH must use frame or base pointer register");
16755 // Reload the base pointer (ESI) with the adjusted incoming EBP.
16756 SDValue NewBP = recoverFramePointer(DAG, Fn, IncomingEBP);
16757 Chain = DAG.getCopyToReg(Chain, dl, RegInfo->getBaseRegister(), NewBP);
16759 // Reload the spilled EBP value, now that the stack and base pointers are
16761 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
16762 X86FI->setHasSEHFramePtrSave(true);
16763 int FI = MF.getFrameInfo()->CreateSpillStackObject(SlotSize, SlotSize);
16764 X86FI->setSEHFramePtrSaveIndex(FI);
16765 SDValue NewFP = DAG.getLoad(VT, dl, Chain, DAG.getFrameIndex(FI, VT),
16766 MachinePointerInfo(), false, false, false,
16767 VT.getScalarSizeInBits() / 8);
16768 Chain = DAG.getCopyToReg(NewFP, dl, FrameReg, NewFP);
16774 /// \brief Lower intrinsics for TRUNCATE_TO_MEM case
16775 /// return truncate Store/MaskedStore Node
16776 static SDValue LowerINTRINSIC_TRUNCATE_TO_MEM(const SDValue & Op,
16780 SDValue Mask = Op.getOperand(4);
16781 SDValue DataToTruncate = Op.getOperand(3);
16782 SDValue Addr = Op.getOperand(2);
16783 SDValue Chain = Op.getOperand(0);
16785 EVT VT = DataToTruncate.getValueType();
16786 EVT SVT = EVT::getVectorVT(*DAG.getContext(),
16787 ElementType, VT.getVectorNumElements());
16789 if (isAllOnes(Mask)) // return just a truncate store
16790 return DAG.getTruncStore(Chain, dl, DataToTruncate, Addr,
16791 MachinePointerInfo(), SVT, false, false,
16792 SVT.getScalarSizeInBits()/8);
16794 EVT MaskVT = EVT::getVectorVT(*DAG.getContext(),
16795 MVT::i1, VT.getVectorNumElements());
16796 EVT BitcastVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
16797 Mask.getValueType().getSizeInBits());
16798 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16799 // are extracted by EXTRACT_SUBVECTOR.
16800 SDValue VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16801 DAG.getBitcast(BitcastVT, Mask),
16802 DAG.getIntPtrConstant(0, dl));
16804 MachineMemOperand *MMO = DAG.getMachineFunction().
16805 getMachineMemOperand(MachinePointerInfo(),
16806 MachineMemOperand::MOStore, SVT.getStoreSize(),
16807 SVT.getScalarSizeInBits()/8);
16809 return DAG.getMaskedStore(Chain, dl, DataToTruncate, Addr,
16810 VMask, SVT, MMO, true);
16813 static SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, const X86Subtarget *Subtarget,
16814 SelectionDAG &DAG) {
16815 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
16817 const IntrinsicData* IntrData = getIntrinsicWithChain(IntNo);
16819 if (IntNo == llvm::Intrinsic::x86_seh_restoreframe)
16820 return LowerSEHRESTOREFRAME(Op, Subtarget, DAG);
16825 switch(IntrData->Type) {
16827 llvm_unreachable("Unknown Intrinsic Type");
16831 // Emit the node with the right value type.
16832 SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::Glue, MVT::Other);
16833 SDValue Result = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(0));
16835 // If the value returned by RDRAND/RDSEED was valid (CF=1), return 1.
16836 // Otherwise return the value from Rand, which is always 0, casted to i32.
16837 SDValue Ops[] = { DAG.getZExtOrTrunc(Result, dl, Op->getValueType(1)),
16838 DAG.getConstant(1, dl, Op->getValueType(1)),
16839 DAG.getConstant(X86::COND_B, dl, MVT::i32),
16840 SDValue(Result.getNode(), 1) };
16841 SDValue isValid = DAG.getNode(X86ISD::CMOV, dl,
16842 DAG.getVTList(Op->getValueType(1), MVT::Glue),
16845 // Return { result, isValid, chain }.
16846 return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(), Result, isValid,
16847 SDValue(Result.getNode(), 2));
16850 //gather(v1, mask, index, base, scale);
16851 SDValue Chain = Op.getOperand(0);
16852 SDValue Src = Op.getOperand(2);
16853 SDValue Base = Op.getOperand(3);
16854 SDValue Index = Op.getOperand(4);
16855 SDValue Mask = Op.getOperand(5);
16856 SDValue Scale = Op.getOperand(6);
16857 return getGatherNode(IntrData->Opc0, Op, DAG, Src, Mask, Base, Index, Scale,
16861 //scatter(base, mask, index, v1, scale);
16862 SDValue Chain = Op.getOperand(0);
16863 SDValue Base = Op.getOperand(2);
16864 SDValue Mask = Op.getOperand(3);
16865 SDValue Index = Op.getOperand(4);
16866 SDValue Src = Op.getOperand(5);
16867 SDValue Scale = Op.getOperand(6);
16868 return getScatterNode(IntrData->Opc0, Op, DAG, Src, Mask, Base, Index,
16872 SDValue Hint = Op.getOperand(6);
16873 unsigned HintVal = cast<ConstantSDNode>(Hint)->getZExtValue();
16874 assert(HintVal < 2 && "Wrong prefetch hint in intrinsic: should be 0 or 1");
16875 unsigned Opcode = (HintVal ? IntrData->Opc1 : IntrData->Opc0);
16876 SDValue Chain = Op.getOperand(0);
16877 SDValue Mask = Op.getOperand(2);
16878 SDValue Index = Op.getOperand(3);
16879 SDValue Base = Op.getOperand(4);
16880 SDValue Scale = Op.getOperand(5);
16881 return getPrefetchNode(Opcode, Op, DAG, Mask, Base, Index, Scale, Chain);
16883 // Read Time Stamp Counter (RDTSC) and Processor ID (RDTSCP).
16885 SmallVector<SDValue, 2> Results;
16886 getReadTimeStampCounter(Op.getNode(), dl, IntrData->Opc0, DAG, Subtarget,
16888 return DAG.getMergeValues(Results, dl);
16890 // Read Performance Monitoring Counters.
16892 SmallVector<SDValue, 2> Results;
16893 getReadPerformanceCounter(Op.getNode(), dl, DAG, Subtarget, Results);
16894 return DAG.getMergeValues(Results, dl);
16896 // XTEST intrinsics.
16898 SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::Other);
16899 SDValue InTrans = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(0));
16900 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16901 DAG.getConstant(X86::COND_NE, dl, MVT::i8),
16903 SDValue Ret = DAG.getNode(ISD::ZERO_EXTEND, dl, Op->getValueType(0), SetCC);
16904 return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(),
16905 Ret, SDValue(InTrans.getNode(), 1));
16909 SmallVector<SDValue, 2> Results;
16910 SDVTList CFVTs = DAG.getVTList(Op->getValueType(0), MVT::Other);
16911 SDVTList VTs = DAG.getVTList(Op.getOperand(3)->getValueType(0), MVT::Other);
16912 SDValue GenCF = DAG.getNode(X86ISD::ADD, dl, CFVTs, Op.getOperand(2),
16913 DAG.getConstant(-1, dl, MVT::i8));
16914 SDValue Res = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(3),
16915 Op.getOperand(4), GenCF.getValue(1));
16916 SDValue Store = DAG.getStore(Op.getOperand(0), dl, Res.getValue(0),
16917 Op.getOperand(5), MachinePointerInfo(),
16919 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16920 DAG.getConstant(X86::COND_B, dl, MVT::i8),
16922 Results.push_back(SetCC);
16923 Results.push_back(Store);
16924 return DAG.getMergeValues(Results, dl);
16926 case COMPRESS_TO_MEM: {
16928 SDValue Mask = Op.getOperand(4);
16929 SDValue DataToCompress = Op.getOperand(3);
16930 SDValue Addr = Op.getOperand(2);
16931 SDValue Chain = Op.getOperand(0);
16933 EVT VT = DataToCompress.getValueType();
16934 if (isAllOnes(Mask)) // return just a store
16935 return DAG.getStore(Chain, dl, DataToCompress, Addr,
16936 MachinePointerInfo(), false, false,
16937 VT.getScalarSizeInBits()/8);
16939 SDValue Compressed =
16940 getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, DataToCompress),
16941 Mask, DAG.getUNDEF(VT), Subtarget, DAG);
16942 return DAG.getStore(Chain, dl, Compressed, Addr,
16943 MachinePointerInfo(), false, false,
16944 VT.getScalarSizeInBits()/8);
16946 case TRUNCATE_TO_MEM_VI8:
16947 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i8);
16948 case TRUNCATE_TO_MEM_VI16:
16949 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i16);
16950 case TRUNCATE_TO_MEM_VI32:
16951 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i32);
16952 case EXPAND_FROM_MEM: {
16954 SDValue Mask = Op.getOperand(4);
16955 SDValue PassThru = Op.getOperand(3);
16956 SDValue Addr = Op.getOperand(2);
16957 SDValue Chain = Op.getOperand(0);
16958 EVT VT = Op.getValueType();
16960 if (isAllOnes(Mask)) // return just a load
16961 return DAG.getLoad(VT, dl, Chain, Addr, MachinePointerInfo(), false, false,
16962 false, VT.getScalarSizeInBits()/8);
16964 SDValue DataToExpand = DAG.getLoad(VT, dl, Chain, Addr, MachinePointerInfo(),
16965 false, false, false,
16966 VT.getScalarSizeInBits()/8);
16968 SDValue Results[] = {
16969 getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, DataToExpand),
16970 Mask, PassThru, Subtarget, DAG), Chain};
16971 return DAG.getMergeValues(Results, dl);
16976 SDValue X86TargetLowering::LowerRETURNADDR(SDValue Op,
16977 SelectionDAG &DAG) const {
16978 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
16979 MFI->setReturnAddressIsTaken(true);
16981 if (verifyReturnAddressArgumentIsConstant(Op, DAG))
16984 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
16986 EVT PtrVT = getPointerTy(DAG.getDataLayout());
16989 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
16990 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
16991 SDValue Offset = DAG.getConstant(RegInfo->getSlotSize(), dl, PtrVT);
16992 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
16993 DAG.getNode(ISD::ADD, dl, PtrVT,
16994 FrameAddr, Offset),
16995 MachinePointerInfo(), false, false, false, 0);
16998 // Just load the return address.
16999 SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
17000 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
17001 RetAddrFI, MachinePointerInfo(), false, false, false, 0);
17004 SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
17005 MachineFunction &MF = DAG.getMachineFunction();
17006 MachineFrameInfo *MFI = MF.getFrameInfo();
17007 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
17008 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17009 EVT VT = Op.getValueType();
17011 MFI->setFrameAddressIsTaken(true);
17013 if (MF.getTarget().getMCAsmInfo()->usesWindowsCFI()) {
17014 // Depth > 0 makes no sense on targets which use Windows unwind codes. It
17015 // is not possible to crawl up the stack without looking at the unwind codes
17017 int FrameAddrIndex = FuncInfo->getFAIndex();
17018 if (!FrameAddrIndex) {
17019 // Set up a frame object for the return address.
17020 unsigned SlotSize = RegInfo->getSlotSize();
17021 FrameAddrIndex = MF.getFrameInfo()->CreateFixedObject(
17022 SlotSize, /*Offset=*/0, /*IsImmutable=*/false);
17023 FuncInfo->setFAIndex(FrameAddrIndex);
17025 return DAG.getFrameIndex(FrameAddrIndex, VT);
17028 unsigned FrameReg =
17029 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
17030 SDLoc dl(Op); // FIXME probably not meaningful
17031 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
17032 assert(((FrameReg == X86::RBP && VT == MVT::i64) ||
17033 (FrameReg == X86::EBP && VT == MVT::i32)) &&
17034 "Invalid Frame Register!");
17035 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
17037 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
17038 MachinePointerInfo(),
17039 false, false, false, 0);
17043 // FIXME? Maybe this could be a TableGen attribute on some registers and
17044 // this table could be generated automatically from RegInfo.
17045 unsigned X86TargetLowering::getRegisterByName(const char* RegName, EVT VT,
17046 SelectionDAG &DAG) const {
17047 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
17048 const MachineFunction &MF = DAG.getMachineFunction();
17050 unsigned Reg = StringSwitch<unsigned>(RegName)
17051 .Case("esp", X86::ESP)
17052 .Case("rsp", X86::RSP)
17053 .Case("ebp", X86::EBP)
17054 .Case("rbp", X86::RBP)
17057 if (Reg == X86::EBP || Reg == X86::RBP) {
17058 if (!TFI.hasFP(MF))
17059 report_fatal_error("register " + StringRef(RegName) +
17060 " is allocatable: function has no frame pointer");
17063 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17064 unsigned FrameReg =
17065 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
17066 assert((FrameReg == X86::EBP || FrameReg == X86::RBP) &&
17067 "Invalid Frame Register!");
17075 report_fatal_error("Invalid register name global variable");
17078 SDValue X86TargetLowering::LowerFRAME_TO_ARGS_OFFSET(SDValue Op,
17079 SelectionDAG &DAG) const {
17080 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17081 return DAG.getIntPtrConstant(2 * RegInfo->getSlotSize(), SDLoc(Op));
17084 SDValue X86TargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const {
17085 SDValue Chain = Op.getOperand(0);
17086 SDValue Offset = Op.getOperand(1);
17087 SDValue Handler = Op.getOperand(2);
17090 EVT PtrVT = getPointerTy(DAG.getDataLayout());
17091 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17092 unsigned FrameReg = RegInfo->getFrameRegister(DAG.getMachineFunction());
17093 assert(((FrameReg == X86::RBP && PtrVT == MVT::i64) ||
17094 (FrameReg == X86::EBP && PtrVT == MVT::i32)) &&
17095 "Invalid Frame Register!");
17096 SDValue Frame = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, PtrVT);
17097 unsigned StoreAddrReg = (PtrVT == MVT::i64) ? X86::RCX : X86::ECX;
17099 SDValue StoreAddr = DAG.getNode(ISD::ADD, dl, PtrVT, Frame,
17100 DAG.getIntPtrConstant(RegInfo->getSlotSize(),
17102 StoreAddr = DAG.getNode(ISD::ADD, dl, PtrVT, StoreAddr, Offset);
17103 Chain = DAG.getStore(Chain, dl, Handler, StoreAddr, MachinePointerInfo(),
17105 Chain = DAG.getCopyToReg(Chain, dl, StoreAddrReg, StoreAddr);
17107 return DAG.getNode(X86ISD::EH_RETURN, dl, MVT::Other, Chain,
17108 DAG.getRegister(StoreAddrReg, PtrVT));
17111 SDValue X86TargetLowering::lowerEH_SJLJ_SETJMP(SDValue Op,
17112 SelectionDAG &DAG) const {
17114 return DAG.getNode(X86ISD::EH_SJLJ_SETJMP, DL,
17115 DAG.getVTList(MVT::i32, MVT::Other),
17116 Op.getOperand(0), Op.getOperand(1));
17119 SDValue X86TargetLowering::lowerEH_SJLJ_LONGJMP(SDValue Op,
17120 SelectionDAG &DAG) const {
17122 return DAG.getNode(X86ISD::EH_SJLJ_LONGJMP, DL, MVT::Other,
17123 Op.getOperand(0), Op.getOperand(1));
17126 static SDValue LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) {
17127 return Op.getOperand(0);
17130 SDValue X86TargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
17131 SelectionDAG &DAG) const {
17132 SDValue Root = Op.getOperand(0);
17133 SDValue Trmp = Op.getOperand(1); // trampoline
17134 SDValue FPtr = Op.getOperand(2); // nested function
17135 SDValue Nest = Op.getOperand(3); // 'nest' parameter value
17138 const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
17139 const TargetRegisterInfo *TRI = Subtarget->getRegisterInfo();
17141 if (Subtarget->is64Bit()) {
17142 SDValue OutChains[6];
17144 // Large code-model.
17145 const unsigned char JMP64r = 0xFF; // 64-bit jmp through register opcode.
17146 const unsigned char MOV64ri = 0xB8; // X86::MOV64ri opcode.
17148 const unsigned char N86R10 = TRI->getEncodingValue(X86::R10) & 0x7;
17149 const unsigned char N86R11 = TRI->getEncodingValue(X86::R11) & 0x7;
17151 const unsigned char REX_WB = 0x40 | 0x08 | 0x01; // REX prefix
17153 // Load the pointer to the nested function into R11.
17154 unsigned OpCode = ((MOV64ri | N86R11) << 8) | REX_WB; // movabsq r11
17155 SDValue Addr = Trmp;
17156 OutChains[0] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17157 Addr, MachinePointerInfo(TrmpAddr),
17160 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17161 DAG.getConstant(2, dl, MVT::i64));
17162 OutChains[1] = DAG.getStore(Root, dl, FPtr, Addr,
17163 MachinePointerInfo(TrmpAddr, 2),
17166 // Load the 'nest' parameter value into R10.
17167 // R10 is specified in X86CallingConv.td
17168 OpCode = ((MOV64ri | N86R10) << 8) | REX_WB; // movabsq r10
17169 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17170 DAG.getConstant(10, dl, MVT::i64));
17171 OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17172 Addr, MachinePointerInfo(TrmpAddr, 10),
17175 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17176 DAG.getConstant(12, dl, MVT::i64));
17177 OutChains[3] = DAG.getStore(Root, dl, Nest, Addr,
17178 MachinePointerInfo(TrmpAddr, 12),
17181 // Jump to the nested function.
17182 OpCode = (JMP64r << 8) | REX_WB; // jmpq *...
17183 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17184 DAG.getConstant(20, dl, MVT::i64));
17185 OutChains[4] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17186 Addr, MachinePointerInfo(TrmpAddr, 20),
17189 unsigned char ModRM = N86R11 | (4 << 3) | (3 << 6); // ...r11
17190 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17191 DAG.getConstant(22, dl, MVT::i64));
17192 OutChains[5] = DAG.getStore(Root, dl, DAG.getConstant(ModRM, dl, MVT::i8),
17193 Addr, MachinePointerInfo(TrmpAddr, 22),
17196 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains);
17198 const Function *Func =
17199 cast<Function>(cast<SrcValueSDNode>(Op.getOperand(5))->getValue());
17200 CallingConv::ID CC = Func->getCallingConv();
17205 llvm_unreachable("Unsupported calling convention");
17206 case CallingConv::C:
17207 case CallingConv::X86_StdCall: {
17208 // Pass 'nest' parameter in ECX.
17209 // Must be kept in sync with X86CallingConv.td
17210 NestReg = X86::ECX;
17212 // Check that ECX wasn't needed by an 'inreg' parameter.
17213 FunctionType *FTy = Func->getFunctionType();
17214 const AttributeSet &Attrs = Func->getAttributes();
17216 if (!Attrs.isEmpty() && !Func->isVarArg()) {
17217 unsigned InRegCount = 0;
17220 for (FunctionType::param_iterator I = FTy->param_begin(),
17221 E = FTy->param_end(); I != E; ++I, ++Idx)
17222 if (Attrs.hasAttribute(Idx, Attribute::InReg)) {
17223 auto &DL = DAG.getDataLayout();
17224 // FIXME: should only count parameters that are lowered to integers.
17225 InRegCount += (DL.getTypeSizeInBits(*I) + 31) / 32;
17228 if (InRegCount > 2) {
17229 report_fatal_error("Nest register in use - reduce number of inreg"
17235 case CallingConv::X86_FastCall:
17236 case CallingConv::X86_ThisCall:
17237 case CallingConv::Fast:
17238 // Pass 'nest' parameter in EAX.
17239 // Must be kept in sync with X86CallingConv.td
17240 NestReg = X86::EAX;
17244 SDValue OutChains[4];
17245 SDValue Addr, Disp;
17247 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17248 DAG.getConstant(10, dl, MVT::i32));
17249 Disp = DAG.getNode(ISD::SUB, dl, MVT::i32, FPtr, Addr);
17251 // This is storing the opcode for MOV32ri.
17252 const unsigned char MOV32ri = 0xB8; // X86::MOV32ri's opcode byte.
17253 const unsigned char N86Reg = TRI->getEncodingValue(NestReg) & 0x7;
17254 OutChains[0] = DAG.getStore(Root, dl,
17255 DAG.getConstant(MOV32ri|N86Reg, dl, MVT::i8),
17256 Trmp, MachinePointerInfo(TrmpAddr),
17259 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17260 DAG.getConstant(1, dl, MVT::i32));
17261 OutChains[1] = DAG.getStore(Root, dl, Nest, Addr,
17262 MachinePointerInfo(TrmpAddr, 1),
17265 const unsigned char JMP = 0xE9; // jmp <32bit dst> opcode.
17266 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17267 DAG.getConstant(5, dl, MVT::i32));
17268 OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(JMP, dl, MVT::i8),
17269 Addr, MachinePointerInfo(TrmpAddr, 5),
17272 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17273 DAG.getConstant(6, dl, MVT::i32));
17274 OutChains[3] = DAG.getStore(Root, dl, Disp, Addr,
17275 MachinePointerInfo(TrmpAddr, 6),
17278 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains);
17282 SDValue X86TargetLowering::LowerFLT_ROUNDS_(SDValue Op,
17283 SelectionDAG &DAG) const {
17285 The rounding mode is in bits 11:10 of FPSR, and has the following
17287 00 Round to nearest
17292 FLT_ROUNDS, on the other hand, expects the following:
17299 To perform the conversion, we do:
17300 (((((FPSR & 0x800) >> 11) | ((FPSR & 0x400) >> 9)) + 1) & 3)
17303 MachineFunction &MF = DAG.getMachineFunction();
17304 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
17305 unsigned StackAlignment = TFI.getStackAlignment();
17306 MVT VT = Op.getSimpleValueType();
17309 // Save FP Control Word to stack slot
17310 int SSFI = MF.getFrameInfo()->CreateStackObject(2, StackAlignment, false);
17311 SDValue StackSlot =
17312 DAG.getFrameIndex(SSFI, getPointerTy(DAG.getDataLayout()));
17314 MachineMemOperand *MMO =
17315 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
17316 MachineMemOperand::MOStore, 2, 2);
17318 SDValue Ops[] = { DAG.getEntryNode(), StackSlot };
17319 SDValue Chain = DAG.getMemIntrinsicNode(X86ISD::FNSTCW16m, DL,
17320 DAG.getVTList(MVT::Other),
17321 Ops, MVT::i16, MMO);
17323 // Load FP Control Word from stack slot
17324 SDValue CWD = DAG.getLoad(MVT::i16, DL, Chain, StackSlot,
17325 MachinePointerInfo(), false, false, false, 0);
17327 // Transform as necessary
17329 DAG.getNode(ISD::SRL, DL, MVT::i16,
17330 DAG.getNode(ISD::AND, DL, MVT::i16,
17331 CWD, DAG.getConstant(0x800, DL, MVT::i16)),
17332 DAG.getConstant(11, DL, MVT::i8));
17334 DAG.getNode(ISD::SRL, DL, MVT::i16,
17335 DAG.getNode(ISD::AND, DL, MVT::i16,
17336 CWD, DAG.getConstant(0x400, DL, MVT::i16)),
17337 DAG.getConstant(9, DL, MVT::i8));
17340 DAG.getNode(ISD::AND, DL, MVT::i16,
17341 DAG.getNode(ISD::ADD, DL, MVT::i16,
17342 DAG.getNode(ISD::OR, DL, MVT::i16, CWD1, CWD2),
17343 DAG.getConstant(1, DL, MVT::i16)),
17344 DAG.getConstant(3, DL, MVT::i16));
17346 return DAG.getNode((VT.getSizeInBits() < 16 ?
17347 ISD::TRUNCATE : ISD::ZERO_EXTEND), DL, VT, RetVal);
17350 static SDValue LowerCTLZ(SDValue Op, SelectionDAG &DAG) {
17351 MVT VT = Op.getSimpleValueType();
17353 unsigned NumBits = VT.getSizeInBits();
17356 Op = Op.getOperand(0);
17357 if (VT == MVT::i8) {
17358 // Zero extend to i32 since there is not an i8 bsr.
17360 Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
17363 // Issue a bsr (scan bits in reverse) which also sets EFLAGS.
17364 SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
17365 Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
17367 // If src is zero (i.e. bsr sets ZF), returns NumBits.
17370 DAG.getConstant(NumBits + NumBits - 1, dl, OpVT),
17371 DAG.getConstant(X86::COND_E, dl, MVT::i8),
17374 Op = DAG.getNode(X86ISD::CMOV, dl, OpVT, Ops);
17376 // Finally xor with NumBits-1.
17377 Op = DAG.getNode(ISD::XOR, dl, OpVT, Op,
17378 DAG.getConstant(NumBits - 1, dl, OpVT));
17381 Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
17385 static SDValue LowerCTLZ_ZERO_UNDEF(SDValue Op, SelectionDAG &DAG) {
17386 MVT VT = Op.getSimpleValueType();
17388 unsigned NumBits = VT.getSizeInBits();
17391 Op = Op.getOperand(0);
17392 if (VT == MVT::i8) {
17393 // Zero extend to i32 since there is not an i8 bsr.
17395 Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
17398 // Issue a bsr (scan bits in reverse).
17399 SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
17400 Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
17402 // And xor with NumBits-1.
17403 Op = DAG.getNode(ISD::XOR, dl, OpVT, Op,
17404 DAG.getConstant(NumBits - 1, dl, OpVT));
17407 Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
17411 static SDValue LowerCTTZ(SDValue Op, SelectionDAG &DAG) {
17412 MVT VT = Op.getSimpleValueType();
17413 unsigned NumBits = VT.getScalarSizeInBits();
17416 if (VT.isVector()) {
17417 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
17419 SDValue N0 = Op.getOperand(0);
17420 SDValue Zero = DAG.getConstant(0, dl, VT);
17422 // lsb(x) = (x & -x)
17423 SDValue LSB = DAG.getNode(ISD::AND, dl, VT, N0,
17424 DAG.getNode(ISD::SUB, dl, VT, Zero, N0));
17426 // cttz_undef(x) = (width - 1) - ctlz(lsb)
17427 if (Op.getOpcode() == ISD::CTTZ_ZERO_UNDEF &&
17428 TLI.isOperationLegal(ISD::CTLZ, VT)) {
17429 SDValue WidthMinusOne = DAG.getConstant(NumBits - 1, dl, VT);
17430 return DAG.getNode(ISD::SUB, dl, VT, WidthMinusOne,
17431 DAG.getNode(ISD::CTLZ, dl, VT, LSB));
17434 // cttz(x) = ctpop(lsb - 1)
17435 SDValue One = DAG.getConstant(1, dl, VT);
17436 return DAG.getNode(ISD::CTPOP, dl, VT,
17437 DAG.getNode(ISD::SUB, dl, VT, LSB, One));
17440 assert(Op.getOpcode() == ISD::CTTZ &&
17441 "Only scalar CTTZ requires custom lowering");
17443 // Issue a bsf (scan bits forward) which also sets EFLAGS.
17444 SDVTList VTs = DAG.getVTList(VT, MVT::i32);
17445 Op = DAG.getNode(X86ISD::BSF, dl, VTs, Op.getOperand(0));
17447 // If src is zero (i.e. bsf sets ZF), returns NumBits.
17450 DAG.getConstant(NumBits, dl, VT),
17451 DAG.getConstant(X86::COND_E, dl, MVT::i8),
17454 return DAG.getNode(X86ISD::CMOV, dl, VT, Ops);
17457 // Lower256IntArith - Break a 256-bit integer operation into two new 128-bit
17458 // ones, and then concatenate the result back.
17459 static SDValue Lower256IntArith(SDValue Op, SelectionDAG &DAG) {
17460 MVT VT = Op.getSimpleValueType();
17462 assert(VT.is256BitVector() && VT.isInteger() &&
17463 "Unsupported value type for operation");
17465 unsigned NumElems = VT.getVectorNumElements();
17468 // Extract the LHS vectors
17469 SDValue LHS = Op.getOperand(0);
17470 SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
17471 SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
17473 // Extract the RHS vectors
17474 SDValue RHS = Op.getOperand(1);
17475 SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
17476 SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
17478 MVT EltVT = VT.getVectorElementType();
17479 MVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
17481 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
17482 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1),
17483 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2));
17486 static SDValue LowerADD(SDValue Op, SelectionDAG &DAG) {
17487 if (Op.getValueType() == MVT::i1)
17488 return DAG.getNode(ISD::XOR, SDLoc(Op), Op.getValueType(),
17489 Op.getOperand(0), Op.getOperand(1));
17490 assert(Op.getSimpleValueType().is256BitVector() &&
17491 Op.getSimpleValueType().isInteger() &&
17492 "Only handle AVX 256-bit vector integer operation");
17493 return Lower256IntArith(Op, DAG);
17496 static SDValue LowerSUB(SDValue Op, SelectionDAG &DAG) {
17497 if (Op.getValueType() == MVT::i1)
17498 return DAG.getNode(ISD::XOR, SDLoc(Op), Op.getValueType(),
17499 Op.getOperand(0), Op.getOperand(1));
17500 assert(Op.getSimpleValueType().is256BitVector() &&
17501 Op.getSimpleValueType().isInteger() &&
17502 "Only handle AVX 256-bit vector integer operation");
17503 return Lower256IntArith(Op, DAG);
17506 static SDValue LowerMINMAX(SDValue Op, SelectionDAG &DAG) {
17507 assert(Op.getSimpleValueType().is256BitVector() &&
17508 Op.getSimpleValueType().isInteger() &&
17509 "Only handle AVX 256-bit vector integer operation");
17510 return Lower256IntArith(Op, DAG);
17513 static SDValue LowerMUL(SDValue Op, const X86Subtarget *Subtarget,
17514 SelectionDAG &DAG) {
17516 MVT VT = Op.getSimpleValueType();
17519 return DAG.getNode(ISD::AND, dl, VT, Op.getOperand(0), Op.getOperand(1));
17521 // Decompose 256-bit ops into smaller 128-bit ops.
17522 if (VT.is256BitVector() && !Subtarget->hasInt256())
17523 return Lower256IntArith(Op, DAG);
17525 SDValue A = Op.getOperand(0);
17526 SDValue B = Op.getOperand(1);
17528 // Lower v16i8/v32i8 mul as promotion to v8i16/v16i16 vector
17529 // pairs, multiply and truncate.
17530 if (VT == MVT::v16i8 || VT == MVT::v32i8) {
17531 if (Subtarget->hasInt256()) {
17532 if (VT == MVT::v32i8) {
17533 MVT SubVT = MVT::getVectorVT(MVT::i8, VT.getVectorNumElements() / 2);
17534 SDValue Lo = DAG.getIntPtrConstant(0, dl);
17535 SDValue Hi = DAG.getIntPtrConstant(VT.getVectorNumElements() / 2, dl);
17536 SDValue ALo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, A, Lo);
17537 SDValue BLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, B, Lo);
17538 SDValue AHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, A, Hi);
17539 SDValue BHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, B, Hi);
17540 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
17541 DAG.getNode(ISD::MUL, dl, SubVT, ALo, BLo),
17542 DAG.getNode(ISD::MUL, dl, SubVT, AHi, BHi));
17545 MVT ExVT = MVT::getVectorVT(MVT::i16, VT.getVectorNumElements());
17546 return DAG.getNode(
17547 ISD::TRUNCATE, dl, VT,
17548 DAG.getNode(ISD::MUL, dl, ExVT,
17549 DAG.getNode(ISD::SIGN_EXTEND, dl, ExVT, A),
17550 DAG.getNode(ISD::SIGN_EXTEND, dl, ExVT, B)));
17553 assert(VT == MVT::v16i8 &&
17554 "Pre-AVX2 support only supports v16i8 multiplication");
17555 MVT ExVT = MVT::v8i16;
17557 // Extract the lo parts and sign extend to i16
17559 if (Subtarget->hasSSE41()) {
17560 ALo = DAG.getNode(X86ISD::VSEXT, dl, ExVT, A);
17561 BLo = DAG.getNode(X86ISD::VSEXT, dl, ExVT, B);
17563 const int ShufMask[] = {-1, 0, -1, 1, -1, 2, -1, 3,
17564 -1, 4, -1, 5, -1, 6, -1, 7};
17565 ALo = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17566 BLo = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17567 ALo = DAG.getBitcast(ExVT, ALo);
17568 BLo = DAG.getBitcast(ExVT, BLo);
17569 ALo = DAG.getNode(ISD::SRA, dl, ExVT, ALo, DAG.getConstant(8, dl, ExVT));
17570 BLo = DAG.getNode(ISD::SRA, dl, ExVT, BLo, DAG.getConstant(8, dl, ExVT));
17573 // Extract the hi parts and sign extend to i16
17575 if (Subtarget->hasSSE41()) {
17576 const int ShufMask[] = {8, 9, 10, 11, 12, 13, 14, 15,
17577 -1, -1, -1, -1, -1, -1, -1, -1};
17578 AHi = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17579 BHi = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17580 AHi = DAG.getNode(X86ISD::VSEXT, dl, ExVT, AHi);
17581 BHi = DAG.getNode(X86ISD::VSEXT, dl, ExVT, BHi);
17583 const int ShufMask[] = {-1, 8, -1, 9, -1, 10, -1, 11,
17584 -1, 12, -1, 13, -1, 14, -1, 15};
17585 AHi = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17586 BHi = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17587 AHi = DAG.getBitcast(ExVT, AHi);
17588 BHi = DAG.getBitcast(ExVT, BHi);
17589 AHi = DAG.getNode(ISD::SRA, dl, ExVT, AHi, DAG.getConstant(8, dl, ExVT));
17590 BHi = DAG.getNode(ISD::SRA, dl, ExVT, BHi, DAG.getConstant(8, dl, ExVT));
17593 // Multiply, mask the lower 8bits of the lo/hi results and pack
17594 SDValue RLo = DAG.getNode(ISD::MUL, dl, ExVT, ALo, BLo);
17595 SDValue RHi = DAG.getNode(ISD::MUL, dl, ExVT, AHi, BHi);
17596 RLo = DAG.getNode(ISD::AND, dl, ExVT, RLo, DAG.getConstant(255, dl, ExVT));
17597 RHi = DAG.getNode(ISD::AND, dl, ExVT, RHi, DAG.getConstant(255, dl, ExVT));
17598 return DAG.getNode(X86ISD::PACKUS, dl, VT, RLo, RHi);
17601 // Lower v4i32 mul as 2x shuffle, 2x pmuludq, 2x shuffle.
17602 if (VT == MVT::v4i32) {
17603 assert(Subtarget->hasSSE2() && !Subtarget->hasSSE41() &&
17604 "Should not custom lower when pmuldq is available!");
17606 // Extract the odd parts.
17607 static const int UnpackMask[] = { 1, -1, 3, -1 };
17608 SDValue Aodds = DAG.getVectorShuffle(VT, dl, A, A, UnpackMask);
17609 SDValue Bodds = DAG.getVectorShuffle(VT, dl, B, B, UnpackMask);
17611 // Multiply the even parts.
17612 SDValue Evens = DAG.getNode(X86ISD::PMULUDQ, dl, MVT::v2i64, A, B);
17613 // Now multiply odd parts.
17614 SDValue Odds = DAG.getNode(X86ISD::PMULUDQ, dl, MVT::v2i64, Aodds, Bodds);
17616 Evens = DAG.getBitcast(VT, Evens);
17617 Odds = DAG.getBitcast(VT, Odds);
17619 // Merge the two vectors back together with a shuffle. This expands into 2
17621 static const int ShufMask[] = { 0, 4, 2, 6 };
17622 return DAG.getVectorShuffle(VT, dl, Evens, Odds, ShufMask);
17625 assert((VT == MVT::v2i64 || VT == MVT::v4i64 || VT == MVT::v8i64) &&
17626 "Only know how to lower V2I64/V4I64/V8I64 multiply");
17628 // Ahi = psrlqi(a, 32);
17629 // Bhi = psrlqi(b, 32);
17631 // AloBlo = pmuludq(a, b);
17632 // AloBhi = pmuludq(a, Bhi);
17633 // AhiBlo = pmuludq(Ahi, b);
17635 // AloBhi = psllqi(AloBhi, 32);
17636 // AhiBlo = psllqi(AhiBlo, 32);
17637 // return AloBlo + AloBhi + AhiBlo;
17639 SDValue Ahi = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, A, 32, DAG);
17640 SDValue Bhi = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, B, 32, DAG);
17642 SDValue AhiBlo = Ahi;
17643 SDValue AloBhi = Bhi;
17644 // Bit cast to 32-bit vectors for MULUDQ
17645 EVT MulVT = (VT == MVT::v2i64) ? MVT::v4i32 :
17646 (VT == MVT::v4i64) ? MVT::v8i32 : MVT::v16i32;
17647 A = DAG.getBitcast(MulVT, A);
17648 B = DAG.getBitcast(MulVT, B);
17649 Ahi = DAG.getBitcast(MulVT, Ahi);
17650 Bhi = DAG.getBitcast(MulVT, Bhi);
17652 SDValue AloBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, B);
17653 // After shifting right const values the result may be all-zero.
17654 if (!ISD::isBuildVectorAllZeros(Ahi.getNode())) {
17655 AhiBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, Ahi, B);
17656 AhiBlo = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, VT, AhiBlo, 32, DAG);
17658 if (!ISD::isBuildVectorAllZeros(Bhi.getNode())) {
17659 AloBhi = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, Bhi);
17660 AloBhi = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, VT, AloBhi, 32, DAG);
17663 SDValue Res = DAG.getNode(ISD::ADD, dl, VT, AloBlo, AloBhi);
17664 return DAG.getNode(ISD::ADD, dl, VT, Res, AhiBlo);
17667 SDValue X86TargetLowering::LowerWin64_i128OP(SDValue Op, SelectionDAG &DAG) const {
17668 assert(Subtarget->isTargetWin64() && "Unexpected target");
17669 EVT VT = Op.getValueType();
17670 assert(VT.isInteger() && VT.getSizeInBits() == 128 &&
17671 "Unexpected return type for lowering");
17675 switch (Op->getOpcode()) {
17676 default: llvm_unreachable("Unexpected request for libcall!");
17677 case ISD::SDIV: isSigned = true; LC = RTLIB::SDIV_I128; break;
17678 case ISD::UDIV: isSigned = false; LC = RTLIB::UDIV_I128; break;
17679 case ISD::SREM: isSigned = true; LC = RTLIB::SREM_I128; break;
17680 case ISD::UREM: isSigned = false; LC = RTLIB::UREM_I128; break;
17681 case ISD::SDIVREM: isSigned = true; LC = RTLIB::SDIVREM_I128; break;
17682 case ISD::UDIVREM: isSigned = false; LC = RTLIB::UDIVREM_I128; break;
17686 SDValue InChain = DAG.getEntryNode();
17688 TargetLowering::ArgListTy Args;
17689 TargetLowering::ArgListEntry Entry;
17690 for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i) {
17691 EVT ArgVT = Op->getOperand(i).getValueType();
17692 assert(ArgVT.isInteger() && ArgVT.getSizeInBits() == 128 &&
17693 "Unexpected argument type for lowering");
17694 SDValue StackPtr = DAG.CreateStackTemporary(ArgVT, 16);
17695 Entry.Node = StackPtr;
17696 InChain = DAG.getStore(InChain, dl, Op->getOperand(i), StackPtr, MachinePointerInfo(),
17698 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
17699 Entry.Ty = PointerType::get(ArgTy,0);
17700 Entry.isSExt = false;
17701 Entry.isZExt = false;
17702 Args.push_back(Entry);
17705 SDValue Callee = DAG.getExternalSymbol(getLibcallName(LC),
17706 getPointerTy(DAG.getDataLayout()));
17708 TargetLowering::CallLoweringInfo CLI(DAG);
17709 CLI.setDebugLoc(dl).setChain(InChain)
17710 .setCallee(getLibcallCallingConv(LC),
17711 static_cast<EVT>(MVT::v2i64).getTypeForEVT(*DAG.getContext()),
17712 Callee, std::move(Args), 0)
17713 .setInRegister().setSExtResult(isSigned).setZExtResult(!isSigned);
17715 std::pair<SDValue, SDValue> CallInfo = LowerCallTo(CLI);
17716 return DAG.getBitcast(VT, CallInfo.first);
17719 static SDValue LowerMUL_LOHI(SDValue Op, const X86Subtarget *Subtarget,
17720 SelectionDAG &DAG) {
17721 SDValue Op0 = Op.getOperand(0), Op1 = Op.getOperand(1);
17722 EVT VT = Op0.getValueType();
17725 assert((VT == MVT::v4i32 && Subtarget->hasSSE2()) ||
17726 (VT == MVT::v8i32 && Subtarget->hasInt256()));
17728 // PMULxD operations multiply each even value (starting at 0) of LHS with
17729 // the related value of RHS and produce a widen result.
17730 // E.g., PMULUDQ <4 x i32> <a|b|c|d>, <4 x i32> <e|f|g|h>
17731 // => <2 x i64> <ae|cg>
17733 // In other word, to have all the results, we need to perform two PMULxD:
17734 // 1. one with the even values.
17735 // 2. one with the odd values.
17736 // To achieve #2, with need to place the odd values at an even position.
17738 // Place the odd value at an even position (basically, shift all values 1
17739 // step to the left):
17740 const int Mask[] = {1, -1, 3, -1, 5, -1, 7, -1};
17741 // <a|b|c|d> => <b|undef|d|undef>
17742 SDValue Odd0 = DAG.getVectorShuffle(VT, dl, Op0, Op0, Mask);
17743 // <e|f|g|h> => <f|undef|h|undef>
17744 SDValue Odd1 = DAG.getVectorShuffle(VT, dl, Op1, Op1, Mask);
17746 // Emit two multiplies, one for the lower 2 ints and one for the higher 2
17748 MVT MulVT = VT == MVT::v4i32 ? MVT::v2i64 : MVT::v4i64;
17749 bool IsSigned = Op->getOpcode() == ISD::SMUL_LOHI;
17751 (!IsSigned || !Subtarget->hasSSE41()) ? X86ISD::PMULUDQ : X86ISD::PMULDQ;
17752 // PMULUDQ <4 x i32> <a|b|c|d>, <4 x i32> <e|f|g|h>
17753 // => <2 x i64> <ae|cg>
17754 SDValue Mul1 = DAG.getBitcast(VT, DAG.getNode(Opcode, dl, MulVT, Op0, Op1));
17755 // PMULUDQ <4 x i32> <b|undef|d|undef>, <4 x i32> <f|undef|h|undef>
17756 // => <2 x i64> <bf|dh>
17757 SDValue Mul2 = DAG.getBitcast(VT, DAG.getNode(Opcode, dl, MulVT, Odd0, Odd1));
17759 // Shuffle it back into the right order.
17760 SDValue Highs, Lows;
17761 if (VT == MVT::v8i32) {
17762 const int HighMask[] = {1, 9, 3, 11, 5, 13, 7, 15};
17763 Highs = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, HighMask);
17764 const int LowMask[] = {0, 8, 2, 10, 4, 12, 6, 14};
17765 Lows = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, LowMask);
17767 const int HighMask[] = {1, 5, 3, 7};
17768 Highs = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, HighMask);
17769 const int LowMask[] = {0, 4, 2, 6};
17770 Lows = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, LowMask);
17773 // If we have a signed multiply but no PMULDQ fix up the high parts of a
17774 // unsigned multiply.
17775 if (IsSigned && !Subtarget->hasSSE41()) {
17776 SDValue ShAmt = DAG.getConstant(
17778 DAG.getTargetLoweringInfo().getShiftAmountTy(VT, DAG.getDataLayout()));
17779 SDValue T1 = DAG.getNode(ISD::AND, dl, VT,
17780 DAG.getNode(ISD::SRA, dl, VT, Op0, ShAmt), Op1);
17781 SDValue T2 = DAG.getNode(ISD::AND, dl, VT,
17782 DAG.getNode(ISD::SRA, dl, VT, Op1, ShAmt), Op0);
17784 SDValue Fixup = DAG.getNode(ISD::ADD, dl, VT, T1, T2);
17785 Highs = DAG.getNode(ISD::SUB, dl, VT, Highs, Fixup);
17788 // The first result of MUL_LOHI is actually the low value, followed by the
17790 SDValue Ops[] = {Lows, Highs};
17791 return DAG.getMergeValues(Ops, dl);
17794 // Return true if the required (according to Opcode) shift-imm form is natively
17795 // supported by the Subtarget
17796 static bool SupportedVectorShiftWithImm(MVT VT, const X86Subtarget *Subtarget,
17798 if (VT.getScalarSizeInBits() < 16)
17801 if (VT.is512BitVector() &&
17802 (VT.getScalarSizeInBits() > 16 || Subtarget->hasBWI()))
17805 bool LShift = VT.is128BitVector() ||
17806 (VT.is256BitVector() && Subtarget->hasInt256());
17808 bool AShift = LShift && (Subtarget->hasVLX() ||
17809 (VT != MVT::v2i64 && VT != MVT::v4i64));
17810 return (Opcode == ISD::SRA) ? AShift : LShift;
17813 // The shift amount is a variable, but it is the same for all vector lanes.
17814 // These instructions are defined together with shift-immediate.
17816 bool SupportedVectorShiftWithBaseAmnt(MVT VT, const X86Subtarget *Subtarget,
17818 return SupportedVectorShiftWithImm(VT, Subtarget, Opcode);
17821 // Return true if the required (according to Opcode) variable-shift form is
17822 // natively supported by the Subtarget
17823 static bool SupportedVectorVarShift(MVT VT, const X86Subtarget *Subtarget,
17826 if (!Subtarget->hasInt256() || VT.getScalarSizeInBits() < 16)
17829 // vXi16 supported only on AVX-512, BWI
17830 if (VT.getScalarSizeInBits() == 16 && !Subtarget->hasBWI())
17833 if (VT.is512BitVector() || Subtarget->hasVLX())
17836 bool LShift = VT.is128BitVector() || VT.is256BitVector();
17837 bool AShift = LShift && VT != MVT::v2i64 && VT != MVT::v4i64;
17838 return (Opcode == ISD::SRA) ? AShift : LShift;
17841 static SDValue LowerScalarImmediateShift(SDValue Op, SelectionDAG &DAG,
17842 const X86Subtarget *Subtarget) {
17843 MVT VT = Op.getSimpleValueType();
17845 SDValue R = Op.getOperand(0);
17846 SDValue Amt = Op.getOperand(1);
17848 unsigned X86Opc = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHLI :
17849 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRLI : X86ISD::VSRAI;
17851 auto ArithmeticShiftRight64 = [&](uint64_t ShiftAmt) {
17852 assert((VT == MVT::v2i64 || VT == MVT::v4i64) && "Unexpected SRA type");
17853 MVT ExVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() * 2);
17854 SDValue Ex = DAG.getBitcast(ExVT, R);
17856 if (ShiftAmt >= 32) {
17857 // Splat sign to upper i32 dst, and SRA upper i32 src to lower i32.
17859 getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex, 31, DAG);
17860 SDValue Lower = getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex,
17861 ShiftAmt - 32, DAG);
17862 if (VT == MVT::v2i64)
17863 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower, {5, 1, 7, 3});
17864 if (VT == MVT::v4i64)
17865 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower,
17866 {9, 1, 11, 3, 13, 5, 15, 7});
17868 // SRA upper i32, SHL whole i64 and select lower i32.
17869 SDValue Upper = getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex,
17872 getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, R, ShiftAmt, DAG);
17873 Lower = DAG.getBitcast(ExVT, Lower);
17874 if (VT == MVT::v2i64)
17875 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower, {4, 1, 6, 3});
17876 if (VT == MVT::v4i64)
17877 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower,
17878 {8, 1, 10, 3, 12, 5, 14, 7});
17880 return DAG.getBitcast(VT, Ex);
17883 // Optimize shl/srl/sra with constant shift amount.
17884 if (auto *BVAmt = dyn_cast<BuildVectorSDNode>(Amt)) {
17885 if (auto *ShiftConst = BVAmt->getConstantSplatNode()) {
17886 uint64_t ShiftAmt = ShiftConst->getZExtValue();
17888 if (SupportedVectorShiftWithImm(VT, Subtarget, Op.getOpcode()))
17889 return getTargetVShiftByConstNode(X86Opc, dl, VT, R, ShiftAmt, DAG);
17891 // i64 SRA needs to be performed as partial shifts.
17892 if ((VT == MVT::v2i64 || (Subtarget->hasInt256() && VT == MVT::v4i64)) &&
17893 Op.getOpcode() == ISD::SRA && !Subtarget->hasXOP())
17894 return ArithmeticShiftRight64(ShiftAmt);
17896 if (VT == MVT::v16i8 || (Subtarget->hasInt256() && VT == MVT::v32i8)) {
17897 unsigned NumElts = VT.getVectorNumElements();
17898 MVT ShiftVT = MVT::getVectorVT(MVT::i16, NumElts / 2);
17900 // Simple i8 add case
17901 if (Op.getOpcode() == ISD::SHL && ShiftAmt == 1)
17902 return DAG.getNode(ISD::ADD, dl, VT, R, R);
17904 // ashr(R, 7) === cmp_slt(R, 0)
17905 if (Op.getOpcode() == ISD::SRA && ShiftAmt == 7) {
17906 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
17907 return DAG.getNode(X86ISD::PCMPGT, dl, VT, Zeros, R);
17910 // XOP can shift v16i8 directly instead of as shift v8i16 + mask.
17911 if (VT == MVT::v16i8 && Subtarget->hasXOP())
17914 if (Op.getOpcode() == ISD::SHL) {
17915 // Make a large shift.
17916 SDValue SHL = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, ShiftVT,
17918 SHL = DAG.getBitcast(VT, SHL);
17919 // Zero out the rightmost bits.
17920 SmallVector<SDValue, 32> V(
17921 NumElts, DAG.getConstant(uint8_t(-1U << ShiftAmt), dl, MVT::i8));
17922 return DAG.getNode(ISD::AND, dl, VT, SHL,
17923 DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V));
17925 if (Op.getOpcode() == ISD::SRL) {
17926 // Make a large shift.
17927 SDValue SRL = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, ShiftVT,
17929 SRL = DAG.getBitcast(VT, SRL);
17930 // Zero out the leftmost bits.
17931 SmallVector<SDValue, 32> V(
17932 NumElts, DAG.getConstant(uint8_t(-1U) >> ShiftAmt, dl, MVT::i8));
17933 return DAG.getNode(ISD::AND, dl, VT, SRL,
17934 DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V));
17936 if (Op.getOpcode() == ISD::SRA) {
17937 // ashr(R, Amt) === sub(xor(lshr(R, Amt), Mask), Mask)
17938 SDValue Res = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
17939 SmallVector<SDValue, 32> V(NumElts,
17940 DAG.getConstant(128 >> ShiftAmt, dl,
17942 SDValue Mask = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V);
17943 Res = DAG.getNode(ISD::XOR, dl, VT, Res, Mask);
17944 Res = DAG.getNode(ISD::SUB, dl, VT, Res, Mask);
17947 llvm_unreachable("Unknown shift opcode.");
17952 // Special case in 32-bit mode, where i64 is expanded into high and low parts.
17953 if (!Subtarget->is64Bit() && !Subtarget->hasXOP() &&
17954 (VT == MVT::v2i64 || (Subtarget->hasInt256() && VT == MVT::v4i64))) {
17956 // Peek through any splat that was introduced for i64 shift vectorization.
17957 int SplatIndex = -1;
17958 if (ShuffleVectorSDNode *SVN = dyn_cast<ShuffleVectorSDNode>(Amt.getNode()))
17959 if (SVN->isSplat()) {
17960 SplatIndex = SVN->getSplatIndex();
17961 Amt = Amt.getOperand(0);
17962 assert(SplatIndex < (int)VT.getVectorNumElements() &&
17963 "Splat shuffle referencing second operand");
17966 if (Amt.getOpcode() != ISD::BITCAST ||
17967 Amt.getOperand(0).getOpcode() != ISD::BUILD_VECTOR)
17970 Amt = Amt.getOperand(0);
17971 unsigned Ratio = Amt.getSimpleValueType().getVectorNumElements() /
17972 VT.getVectorNumElements();
17973 unsigned RatioInLog2 = Log2_32_Ceil(Ratio);
17974 uint64_t ShiftAmt = 0;
17975 unsigned BaseOp = (SplatIndex < 0 ? 0 : SplatIndex * Ratio);
17976 for (unsigned i = 0; i != Ratio; ++i) {
17977 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Amt.getOperand(i + BaseOp));
17981 ShiftAmt |= C->getZExtValue() << (i * (1 << (6 - RatioInLog2)));
17984 // Check remaining shift amounts (if not a splat).
17985 if (SplatIndex < 0) {
17986 for (unsigned i = Ratio; i != Amt.getNumOperands(); i += Ratio) {
17987 uint64_t ShAmt = 0;
17988 for (unsigned j = 0; j != Ratio; ++j) {
17989 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Amt.getOperand(i + j));
17993 ShAmt |= C->getZExtValue() << (j * (1 << (6 - RatioInLog2)));
17995 if (ShAmt != ShiftAmt)
18000 if (SupportedVectorShiftWithImm(VT, Subtarget, Op.getOpcode()))
18001 return getTargetVShiftByConstNode(X86Opc, dl, VT, R, ShiftAmt, DAG);
18003 if (Op.getOpcode() == ISD::SRA)
18004 return ArithmeticShiftRight64(ShiftAmt);
18010 static SDValue LowerScalarVariableShift(SDValue Op, SelectionDAG &DAG,
18011 const X86Subtarget* Subtarget) {
18012 MVT VT = Op.getSimpleValueType();
18014 SDValue R = Op.getOperand(0);
18015 SDValue Amt = Op.getOperand(1);
18017 unsigned X86OpcI = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHLI :
18018 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRLI : X86ISD::VSRAI;
18020 unsigned X86OpcV = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHL :
18021 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRL : X86ISD::VSRA;
18023 if (SupportedVectorShiftWithBaseAmnt(VT, Subtarget, Op.getOpcode())) {
18025 EVT EltVT = VT.getVectorElementType();
18027 if (BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Amt)) {
18028 // Check if this build_vector node is doing a splat.
18029 // If so, then set BaseShAmt equal to the splat value.
18030 BaseShAmt = BV->getSplatValue();
18031 if (BaseShAmt && BaseShAmt.getOpcode() == ISD::UNDEF)
18032 BaseShAmt = SDValue();
18034 if (Amt.getOpcode() == ISD::EXTRACT_SUBVECTOR)
18035 Amt = Amt.getOperand(0);
18037 ShuffleVectorSDNode *SVN = dyn_cast<ShuffleVectorSDNode>(Amt);
18038 if (SVN && SVN->isSplat()) {
18039 unsigned SplatIdx = (unsigned)SVN->getSplatIndex();
18040 SDValue InVec = Amt.getOperand(0);
18041 if (InVec.getOpcode() == ISD::BUILD_VECTOR) {
18042 assert((SplatIdx < InVec.getValueType().getVectorNumElements()) &&
18043 "Unexpected shuffle index found!");
18044 BaseShAmt = InVec.getOperand(SplatIdx);
18045 } else if (InVec.getOpcode() == ISD::INSERT_VECTOR_ELT) {
18046 if (ConstantSDNode *C =
18047 dyn_cast<ConstantSDNode>(InVec.getOperand(2))) {
18048 if (C->getZExtValue() == SplatIdx)
18049 BaseShAmt = InVec.getOperand(1);
18054 // Avoid introducing an extract element from a shuffle.
18055 BaseShAmt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, InVec,
18056 DAG.getIntPtrConstant(SplatIdx, dl));
18060 if (BaseShAmt.getNode()) {
18061 assert(EltVT.bitsLE(MVT::i64) && "Unexpected element type!");
18062 if (EltVT != MVT::i64 && EltVT.bitsGT(MVT::i32))
18063 BaseShAmt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i64, BaseShAmt);
18064 else if (EltVT.bitsLT(MVT::i32))
18065 BaseShAmt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, BaseShAmt);
18067 return getTargetVShiftNode(X86OpcI, dl, VT, R, BaseShAmt, DAG);
18071 // Special case in 32-bit mode, where i64 is expanded into high and low parts.
18072 if (!Subtarget->is64Bit() && VT == MVT::v2i64 &&
18073 Amt.getOpcode() == ISD::BITCAST &&
18074 Amt.getOperand(0).getOpcode() == ISD::BUILD_VECTOR) {
18075 Amt = Amt.getOperand(0);
18076 unsigned Ratio = Amt.getSimpleValueType().getVectorNumElements() /
18077 VT.getVectorNumElements();
18078 std::vector<SDValue> Vals(Ratio);
18079 for (unsigned i = 0; i != Ratio; ++i)
18080 Vals[i] = Amt.getOperand(i);
18081 for (unsigned i = Ratio; i != Amt.getNumOperands(); i += Ratio) {
18082 for (unsigned j = 0; j != Ratio; ++j)
18083 if (Vals[j] != Amt.getOperand(i + j))
18087 if (SupportedVectorShiftWithBaseAmnt(VT, Subtarget, Op.getOpcode()))
18088 return DAG.getNode(X86OpcV, dl, VT, R, Op.getOperand(1));
18093 static SDValue LowerShift(SDValue Op, const X86Subtarget* Subtarget,
18094 SelectionDAG &DAG) {
18095 MVT VT = Op.getSimpleValueType();
18097 SDValue R = Op.getOperand(0);
18098 SDValue Amt = Op.getOperand(1);
18100 assert(VT.isVector() && "Custom lowering only for vector shifts!");
18101 assert(Subtarget->hasSSE2() && "Only custom lower when we have SSE2!");
18103 if (SDValue V = LowerScalarImmediateShift(Op, DAG, Subtarget))
18106 if (SDValue V = LowerScalarVariableShift(Op, DAG, Subtarget))
18109 if (SupportedVectorVarShift(VT, Subtarget, Op.getOpcode()))
18112 // XOP has 128-bit variable logical/arithmetic shifts.
18113 // +ve/-ve Amt = shift left/right.
18114 if (Subtarget->hasXOP() &&
18115 (VT == MVT::v2i64 || VT == MVT::v4i32 ||
18116 VT == MVT::v8i16 || VT == MVT::v16i8)) {
18117 if (Op.getOpcode() == ISD::SRL || Op.getOpcode() == ISD::SRA) {
18118 SDValue Zero = getZeroVector(VT, Subtarget, DAG, dl);
18119 Amt = DAG.getNode(ISD::SUB, dl, VT, Zero, Amt);
18121 if (Op.getOpcode() == ISD::SHL || Op.getOpcode() == ISD::SRL)
18122 return DAG.getNode(X86ISD::VPSHL, dl, VT, R, Amt);
18123 if (Op.getOpcode() == ISD::SRA)
18124 return DAG.getNode(X86ISD::VPSHA, dl, VT, R, Amt);
18127 // 2i64 vector logical shifts can efficiently avoid scalarization - do the
18128 // shifts per-lane and then shuffle the partial results back together.
18129 if (VT == MVT::v2i64 && Op.getOpcode() != ISD::SRA) {
18130 // Splat the shift amounts so the scalar shifts above will catch it.
18131 SDValue Amt0 = DAG.getVectorShuffle(VT, dl, Amt, Amt, {0, 0});
18132 SDValue Amt1 = DAG.getVectorShuffle(VT, dl, Amt, Amt, {1, 1});
18133 SDValue R0 = DAG.getNode(Op->getOpcode(), dl, VT, R, Amt0);
18134 SDValue R1 = DAG.getNode(Op->getOpcode(), dl, VT, R, Amt1);
18135 return DAG.getVectorShuffle(VT, dl, R0, R1, {0, 3});
18138 // i64 vector arithmetic shift can be emulated with the transform:
18139 // M = lshr(SIGN_BIT, Amt)
18140 // ashr(R, Amt) === sub(xor(lshr(R, Amt), M), M)
18141 if ((VT == MVT::v2i64 || (VT == MVT::v4i64 && Subtarget->hasInt256())) &&
18142 Op.getOpcode() == ISD::SRA) {
18143 SDValue S = DAG.getConstant(APInt::getSignBit(64), dl, VT);
18144 SDValue M = DAG.getNode(ISD::SRL, dl, VT, S, Amt);
18145 R = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
18146 R = DAG.getNode(ISD::XOR, dl, VT, R, M);
18147 R = DAG.getNode(ISD::SUB, dl, VT, R, M);
18151 // If possible, lower this packed shift into a vector multiply instead of
18152 // expanding it into a sequence of scalar shifts.
18153 // Do this only if the vector shift count is a constant build_vector.
18154 if (Op.getOpcode() == ISD::SHL &&
18155 (VT == MVT::v8i16 || VT == MVT::v4i32 ||
18156 (Subtarget->hasInt256() && VT == MVT::v16i16)) &&
18157 ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18158 SmallVector<SDValue, 8> Elts;
18159 EVT SVT = VT.getScalarType();
18160 unsigned SVTBits = SVT.getSizeInBits();
18161 const APInt &One = APInt(SVTBits, 1);
18162 unsigned NumElems = VT.getVectorNumElements();
18164 for (unsigned i=0; i !=NumElems; ++i) {
18165 SDValue Op = Amt->getOperand(i);
18166 if (Op->getOpcode() == ISD::UNDEF) {
18167 Elts.push_back(Op);
18171 ConstantSDNode *ND = cast<ConstantSDNode>(Op);
18172 const APInt &C = APInt(SVTBits, ND->getAPIntValue().getZExtValue());
18173 uint64_t ShAmt = C.getZExtValue();
18174 if (ShAmt >= SVTBits) {
18175 Elts.push_back(DAG.getUNDEF(SVT));
18178 Elts.push_back(DAG.getConstant(One.shl(ShAmt), dl, SVT));
18180 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Elts);
18181 return DAG.getNode(ISD::MUL, dl, VT, R, BV);
18184 // Lower SHL with variable shift amount.
18185 if (VT == MVT::v4i32 && Op->getOpcode() == ISD::SHL) {
18186 Op = DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(23, dl, VT));
18188 Op = DAG.getNode(ISD::ADD, dl, VT, Op,
18189 DAG.getConstant(0x3f800000U, dl, VT));
18190 Op = DAG.getBitcast(MVT::v4f32, Op);
18191 Op = DAG.getNode(ISD::FP_TO_SINT, dl, VT, Op);
18192 return DAG.getNode(ISD::MUL, dl, VT, Op, R);
18195 // If possible, lower this shift as a sequence of two shifts by
18196 // constant plus a MOVSS/MOVSD instead of scalarizing it.
18198 // (v4i32 (srl A, (build_vector < X, Y, Y, Y>)))
18200 // Could be rewritten as:
18201 // (v4i32 (MOVSS (srl A, <Y,Y,Y,Y>), (srl A, <X,X,X,X>)))
18203 // The advantage is that the two shifts from the example would be
18204 // lowered as X86ISD::VSRLI nodes. This would be cheaper than scalarizing
18205 // the vector shift into four scalar shifts plus four pairs of vector
18207 if ((VT == MVT::v8i16 || VT == MVT::v4i32) &&
18208 ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18209 unsigned TargetOpcode = X86ISD::MOVSS;
18210 bool CanBeSimplified;
18211 // The splat value for the first packed shift (the 'X' from the example).
18212 SDValue Amt1 = Amt->getOperand(0);
18213 // The splat value for the second packed shift (the 'Y' from the example).
18214 SDValue Amt2 = (VT == MVT::v4i32) ? Amt->getOperand(1) :
18215 Amt->getOperand(2);
18217 // See if it is possible to replace this node with a sequence of
18218 // two shifts followed by a MOVSS/MOVSD
18219 if (VT == MVT::v4i32) {
18220 // Check if it is legal to use a MOVSS.
18221 CanBeSimplified = Amt2 == Amt->getOperand(2) &&
18222 Amt2 == Amt->getOperand(3);
18223 if (!CanBeSimplified) {
18224 // Otherwise, check if we can still simplify this node using a MOVSD.
18225 CanBeSimplified = Amt1 == Amt->getOperand(1) &&
18226 Amt->getOperand(2) == Amt->getOperand(3);
18227 TargetOpcode = X86ISD::MOVSD;
18228 Amt2 = Amt->getOperand(2);
18231 // Do similar checks for the case where the machine value type
18233 CanBeSimplified = Amt1 == Amt->getOperand(1);
18234 for (unsigned i=3; i != 8 && CanBeSimplified; ++i)
18235 CanBeSimplified = Amt2 == Amt->getOperand(i);
18237 if (!CanBeSimplified) {
18238 TargetOpcode = X86ISD::MOVSD;
18239 CanBeSimplified = true;
18240 Amt2 = Amt->getOperand(4);
18241 for (unsigned i=0; i != 4 && CanBeSimplified; ++i)
18242 CanBeSimplified = Amt1 == Amt->getOperand(i);
18243 for (unsigned j=4; j != 8 && CanBeSimplified; ++j)
18244 CanBeSimplified = Amt2 == Amt->getOperand(j);
18248 if (CanBeSimplified && isa<ConstantSDNode>(Amt1) &&
18249 isa<ConstantSDNode>(Amt2)) {
18250 // Replace this node with two shifts followed by a MOVSS/MOVSD.
18251 EVT CastVT = MVT::v4i32;
18253 DAG.getConstant(cast<ConstantSDNode>(Amt1)->getAPIntValue(), dl, VT);
18254 SDValue Shift1 = DAG.getNode(Op->getOpcode(), dl, VT, R, Splat1);
18256 DAG.getConstant(cast<ConstantSDNode>(Amt2)->getAPIntValue(), dl, VT);
18257 SDValue Shift2 = DAG.getNode(Op->getOpcode(), dl, VT, R, Splat2);
18258 if (TargetOpcode == X86ISD::MOVSD)
18259 CastVT = MVT::v2i64;
18260 SDValue BitCast1 = DAG.getBitcast(CastVT, Shift1);
18261 SDValue BitCast2 = DAG.getBitcast(CastVT, Shift2);
18262 SDValue Result = getTargetShuffleNode(TargetOpcode, dl, CastVT, BitCast2,
18264 return DAG.getBitcast(VT, Result);
18268 // v4i32 Non Uniform Shifts.
18269 // If the shift amount is constant we can shift each lane using the SSE2
18270 // immediate shifts, else we need to zero-extend each lane to the lower i64
18271 // and shift using the SSE2 variable shifts.
18272 // The separate results can then be blended together.
18273 if (VT == MVT::v4i32) {
18274 unsigned Opc = Op.getOpcode();
18275 SDValue Amt0, Amt1, Amt2, Amt3;
18276 if (ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18277 Amt0 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {0, 0, 0, 0});
18278 Amt1 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {1, 1, 1, 1});
18279 Amt2 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {2, 2, 2, 2});
18280 Amt3 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {3, 3, 3, 3});
18282 // ISD::SHL is handled above but we include it here for completeness.
18285 llvm_unreachable("Unknown target vector shift node");
18287 Opc = X86ISD::VSHL;
18290 Opc = X86ISD::VSRL;
18293 Opc = X86ISD::VSRA;
18296 // The SSE2 shifts use the lower i64 as the same shift amount for
18297 // all lanes and the upper i64 is ignored. These shuffle masks
18298 // optimally zero-extend each lanes on SSE2/SSE41/AVX targets.
18299 SDValue Z = getZeroVector(VT, Subtarget, DAG, dl);
18300 Amt0 = DAG.getVectorShuffle(VT, dl, Amt, Z, {0, 4, -1, -1});
18301 Amt1 = DAG.getVectorShuffle(VT, dl, Amt, Z, {1, 5, -1, -1});
18302 Amt2 = DAG.getVectorShuffle(VT, dl, Amt, Z, {2, 6, -1, -1});
18303 Amt3 = DAG.getVectorShuffle(VT, dl, Amt, Z, {3, 7, -1, -1});
18306 SDValue R0 = DAG.getNode(Opc, dl, VT, R, Amt0);
18307 SDValue R1 = DAG.getNode(Opc, dl, VT, R, Amt1);
18308 SDValue R2 = DAG.getNode(Opc, dl, VT, R, Amt2);
18309 SDValue R3 = DAG.getNode(Opc, dl, VT, R, Amt3);
18310 SDValue R02 = DAG.getVectorShuffle(VT, dl, R0, R2, {0, -1, 6, -1});
18311 SDValue R13 = DAG.getVectorShuffle(VT, dl, R1, R3, {-1, 1, -1, 7});
18312 return DAG.getVectorShuffle(VT, dl, R02, R13, {0, 5, 2, 7});
18315 if (VT == MVT::v16i8 ||
18316 (VT == MVT::v32i8 && Subtarget->hasInt256() && !Subtarget->hasXOP())) {
18317 MVT ExtVT = MVT::getVectorVT(MVT::i16, VT.getVectorNumElements() / 2);
18318 unsigned ShiftOpcode = Op->getOpcode();
18320 auto SignBitSelect = [&](MVT SelVT, SDValue Sel, SDValue V0, SDValue V1) {
18321 // On SSE41 targets we make use of the fact that VSELECT lowers
18322 // to PBLENDVB which selects bytes based just on the sign bit.
18323 if (Subtarget->hasSSE41()) {
18324 V0 = DAG.getBitcast(VT, V0);
18325 V1 = DAG.getBitcast(VT, V1);
18326 Sel = DAG.getBitcast(VT, Sel);
18327 return DAG.getBitcast(SelVT,
18328 DAG.getNode(ISD::VSELECT, dl, VT, Sel, V0, V1));
18330 // On pre-SSE41 targets we test for the sign bit by comparing to
18331 // zero - a negative value will set all bits of the lanes to true
18332 // and VSELECT uses that in its OR(AND(V0,C),AND(V1,~C)) lowering.
18333 SDValue Z = getZeroVector(SelVT, Subtarget, DAG, dl);
18334 SDValue C = DAG.getNode(X86ISD::PCMPGT, dl, SelVT, Z, Sel);
18335 return DAG.getNode(ISD::VSELECT, dl, SelVT, C, V0, V1);
18338 // Turn 'a' into a mask suitable for VSELECT: a = a << 5;
18339 // We can safely do this using i16 shifts as we're only interested in
18340 // the 3 lower bits of each byte.
18341 Amt = DAG.getBitcast(ExtVT, Amt);
18342 Amt = DAG.getNode(ISD::SHL, dl, ExtVT, Amt, DAG.getConstant(5, dl, ExtVT));
18343 Amt = DAG.getBitcast(VT, Amt);
18345 if (Op->getOpcode() == ISD::SHL || Op->getOpcode() == ISD::SRL) {
18346 // r = VSELECT(r, shift(r, 4), a);
18348 DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(4, dl, VT));
18349 R = SignBitSelect(VT, Amt, M, R);
18352 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18354 // r = VSELECT(r, shift(r, 2), a);
18355 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(2, dl, VT));
18356 R = SignBitSelect(VT, Amt, M, R);
18359 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18361 // return VSELECT(r, shift(r, 1), a);
18362 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(1, dl, VT));
18363 R = SignBitSelect(VT, Amt, M, R);
18367 if (Op->getOpcode() == ISD::SRA) {
18368 // For SRA we need to unpack each byte to the higher byte of a i16 vector
18369 // so we can correctly sign extend. We don't care what happens to the
18371 SDValue ALo = DAG.getNode(X86ISD::UNPCKL, dl, VT, DAG.getUNDEF(VT), Amt);
18372 SDValue AHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, DAG.getUNDEF(VT), Amt);
18373 SDValue RLo = DAG.getNode(X86ISD::UNPCKL, dl, VT, DAG.getUNDEF(VT), R);
18374 SDValue RHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, DAG.getUNDEF(VT), R);
18375 ALo = DAG.getBitcast(ExtVT, ALo);
18376 AHi = DAG.getBitcast(ExtVT, AHi);
18377 RLo = DAG.getBitcast(ExtVT, RLo);
18378 RHi = DAG.getBitcast(ExtVT, RHi);
18380 // r = VSELECT(r, shift(r, 4), a);
18381 SDValue MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18382 DAG.getConstant(4, dl, ExtVT));
18383 SDValue MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18384 DAG.getConstant(4, dl, ExtVT));
18385 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18386 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18389 ALo = DAG.getNode(ISD::ADD, dl, ExtVT, ALo, ALo);
18390 AHi = DAG.getNode(ISD::ADD, dl, ExtVT, AHi, AHi);
18392 // r = VSELECT(r, shift(r, 2), a);
18393 MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18394 DAG.getConstant(2, dl, ExtVT));
18395 MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18396 DAG.getConstant(2, dl, ExtVT));
18397 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18398 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18401 ALo = DAG.getNode(ISD::ADD, dl, ExtVT, ALo, ALo);
18402 AHi = DAG.getNode(ISD::ADD, dl, ExtVT, AHi, AHi);
18404 // r = VSELECT(r, shift(r, 1), a);
18405 MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18406 DAG.getConstant(1, dl, ExtVT));
18407 MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18408 DAG.getConstant(1, dl, ExtVT));
18409 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18410 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18412 // Logical shift the result back to the lower byte, leaving a zero upper
18414 // meaning that we can safely pack with PACKUSWB.
18416 DAG.getNode(ISD::SRL, dl, ExtVT, RLo, DAG.getConstant(8, dl, ExtVT));
18418 DAG.getNode(ISD::SRL, dl, ExtVT, RHi, DAG.getConstant(8, dl, ExtVT));
18419 return DAG.getNode(X86ISD::PACKUS, dl, VT, RLo, RHi);
18423 // It's worth extending once and using the v8i32 shifts for 16-bit types, but
18424 // the extra overheads to get from v16i8 to v8i32 make the existing SSE
18425 // solution better.
18426 if (Subtarget->hasInt256() && VT == MVT::v8i16) {
18427 MVT ExtVT = MVT::v8i32;
18429 Op.getOpcode() == ISD::SRA ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
18430 R = DAG.getNode(ExtOpc, dl, ExtVT, R);
18431 Amt = DAG.getNode(ISD::ANY_EXTEND, dl, ExtVT, Amt);
18432 return DAG.getNode(ISD::TRUNCATE, dl, VT,
18433 DAG.getNode(Op.getOpcode(), dl, ExtVT, R, Amt));
18436 if (Subtarget->hasInt256() && !Subtarget->hasXOP() && VT == MVT::v16i16) {
18437 MVT ExtVT = MVT::v8i32;
18438 SDValue Z = getZeroVector(VT, Subtarget, DAG, dl);
18439 SDValue ALo = DAG.getNode(X86ISD::UNPCKL, dl, VT, Amt, Z);
18440 SDValue AHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, Amt, Z);
18441 SDValue RLo = DAG.getNode(X86ISD::UNPCKL, dl, VT, R, R);
18442 SDValue RHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, R, R);
18443 ALo = DAG.getBitcast(ExtVT, ALo);
18444 AHi = DAG.getBitcast(ExtVT, AHi);
18445 RLo = DAG.getBitcast(ExtVT, RLo);
18446 RHi = DAG.getBitcast(ExtVT, RHi);
18447 SDValue Lo = DAG.getNode(Op.getOpcode(), dl, ExtVT, RLo, ALo);
18448 SDValue Hi = DAG.getNode(Op.getOpcode(), dl, ExtVT, RHi, AHi);
18449 Lo = DAG.getNode(ISD::SRL, dl, ExtVT, Lo, DAG.getConstant(16, dl, ExtVT));
18450 Hi = DAG.getNode(ISD::SRL, dl, ExtVT, Hi, DAG.getConstant(16, dl, ExtVT));
18451 return DAG.getNode(X86ISD::PACKUS, dl, VT, Lo, Hi);
18454 if (VT == MVT::v8i16) {
18455 unsigned ShiftOpcode = Op->getOpcode();
18457 auto SignBitSelect = [&](SDValue Sel, SDValue V0, SDValue V1) {
18458 // On SSE41 targets we make use of the fact that VSELECT lowers
18459 // to PBLENDVB which selects bytes based just on the sign bit.
18460 if (Subtarget->hasSSE41()) {
18461 MVT ExtVT = MVT::getVectorVT(MVT::i8, VT.getVectorNumElements() * 2);
18462 V0 = DAG.getBitcast(ExtVT, V0);
18463 V1 = DAG.getBitcast(ExtVT, V1);
18464 Sel = DAG.getBitcast(ExtVT, Sel);
18465 return DAG.getBitcast(
18466 VT, DAG.getNode(ISD::VSELECT, dl, ExtVT, Sel, V0, V1));
18468 // On pre-SSE41 targets we splat the sign bit - a negative value will
18469 // set all bits of the lanes to true and VSELECT uses that in
18470 // its OR(AND(V0,C),AND(V1,~C)) lowering.
18472 DAG.getNode(ISD::SRA, dl, VT, Sel, DAG.getConstant(15, dl, VT));
18473 return DAG.getNode(ISD::VSELECT, dl, VT, C, V0, V1);
18476 // Turn 'a' into a mask suitable for VSELECT: a = a << 12;
18477 if (Subtarget->hasSSE41()) {
18478 // On SSE41 targets we need to replicate the shift mask in both
18479 // bytes for PBLENDVB.
18482 DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(4, dl, VT)),
18483 DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(12, dl, VT)));
18485 Amt = DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(12, dl, VT));
18488 // r = VSELECT(r, shift(r, 8), a);
18489 SDValue M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(8, dl, VT));
18490 R = SignBitSelect(Amt, M, R);
18493 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18495 // r = VSELECT(r, shift(r, 4), a);
18496 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(4, dl, VT));
18497 R = SignBitSelect(Amt, M, R);
18500 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18502 // r = VSELECT(r, shift(r, 2), a);
18503 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(2, dl, VT));
18504 R = SignBitSelect(Amt, M, R);
18507 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18509 // return VSELECT(r, shift(r, 1), a);
18510 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(1, dl, VT));
18511 R = SignBitSelect(Amt, M, R);
18515 // Decompose 256-bit shifts into smaller 128-bit shifts.
18516 if (VT.is256BitVector()) {
18517 unsigned NumElems = VT.getVectorNumElements();
18518 MVT EltVT = VT.getVectorElementType();
18519 EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
18521 // Extract the two vectors
18522 SDValue V1 = Extract128BitVector(R, 0, DAG, dl);
18523 SDValue V2 = Extract128BitVector(R, NumElems/2, DAG, dl);
18525 // Recreate the shift amount vectors
18526 SDValue Amt1, Amt2;
18527 if (Amt.getOpcode() == ISD::BUILD_VECTOR) {
18528 // Constant shift amount
18529 SmallVector<SDValue, 8> Ops(Amt->op_begin(), Amt->op_begin() + NumElems);
18530 ArrayRef<SDValue> Amt1Csts = makeArrayRef(Ops).slice(0, NumElems / 2);
18531 ArrayRef<SDValue> Amt2Csts = makeArrayRef(Ops).slice(NumElems / 2);
18533 Amt1 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Amt1Csts);
18534 Amt2 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Amt2Csts);
18536 // Variable shift amount
18537 Amt1 = Extract128BitVector(Amt, 0, DAG, dl);
18538 Amt2 = Extract128BitVector(Amt, NumElems/2, DAG, dl);
18541 // Issue new vector shifts for the smaller types
18542 V1 = DAG.getNode(Op.getOpcode(), dl, NewVT, V1, Amt1);
18543 V2 = DAG.getNode(Op.getOpcode(), dl, NewVT, V2, Amt2);
18545 // Concatenate the result back
18546 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, V1, V2);
18552 static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
18553 // Lower the "add/sub/mul with overflow" instruction into a regular ins plus
18554 // a "setcc" instruction that checks the overflow flag. The "brcond" lowering
18555 // looks for this combo and may remove the "setcc" instruction if the "setcc"
18556 // has only one use.
18557 SDNode *N = Op.getNode();
18558 SDValue LHS = N->getOperand(0);
18559 SDValue RHS = N->getOperand(1);
18560 unsigned BaseOp = 0;
18563 switch (Op.getOpcode()) {
18564 default: llvm_unreachable("Unknown ovf instruction!");
18566 // A subtract of one will be selected as a INC. Note that INC doesn't
18567 // set CF, so we can't do this for UADDO.
18568 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
18570 BaseOp = X86ISD::INC;
18571 Cond = X86::COND_O;
18574 BaseOp = X86ISD::ADD;
18575 Cond = X86::COND_O;
18578 BaseOp = X86ISD::ADD;
18579 Cond = X86::COND_B;
18582 // A subtract of one will be selected as a DEC. Note that DEC doesn't
18583 // set CF, so we can't do this for USUBO.
18584 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
18586 BaseOp = X86ISD::DEC;
18587 Cond = X86::COND_O;
18590 BaseOp = X86ISD::SUB;
18591 Cond = X86::COND_O;
18594 BaseOp = X86ISD::SUB;
18595 Cond = X86::COND_B;
18598 BaseOp = N->getValueType(0) == MVT::i8 ? X86ISD::SMUL8 : X86ISD::SMUL;
18599 Cond = X86::COND_O;
18601 case ISD::UMULO: { // i64, i8 = umulo lhs, rhs --> i64, i64, i32 umul lhs,rhs
18602 if (N->getValueType(0) == MVT::i8) {
18603 BaseOp = X86ISD::UMUL8;
18604 Cond = X86::COND_O;
18607 SDVTList VTs = DAG.getVTList(N->getValueType(0), N->getValueType(0),
18609 SDValue Sum = DAG.getNode(X86ISD::UMUL, DL, VTs, LHS, RHS);
18612 DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
18613 DAG.getConstant(X86::COND_O, DL, MVT::i32),
18614 SDValue(Sum.getNode(), 2));
18616 return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
18620 // Also sets EFLAGS.
18621 SDVTList VTs = DAG.getVTList(N->getValueType(0), MVT::i32);
18622 SDValue Sum = DAG.getNode(BaseOp, DL, VTs, LHS, RHS);
18625 DAG.getNode(X86ISD::SETCC, DL, N->getValueType(1),
18626 DAG.getConstant(Cond, DL, MVT::i32),
18627 SDValue(Sum.getNode(), 1));
18629 return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
18632 /// Returns true if the operand type is exactly twice the native width, and
18633 /// the corresponding cmpxchg8b or cmpxchg16b instruction is available.
18634 /// Used to know whether to use cmpxchg8/16b when expanding atomic operations
18635 /// (otherwise we leave them alone to become __sync_fetch_and_... calls).
18636 bool X86TargetLowering::needsCmpXchgNb(Type *MemType) const {
18637 unsigned OpWidth = MemType->getPrimitiveSizeInBits();
18640 return !Subtarget->is64Bit(); // FIXME this should be Subtarget.hasCmpxchg8b
18641 else if (OpWidth == 128)
18642 return Subtarget->hasCmpxchg16b();
18647 bool X86TargetLowering::shouldExpandAtomicStoreInIR(StoreInst *SI) const {
18648 return needsCmpXchgNb(SI->getValueOperand()->getType());
18651 // Note: this turns large loads into lock cmpxchg8b/16b.
18652 // FIXME: On 32 bits x86, fild/movq might be faster than lock cmpxchg8b.
18653 TargetLowering::AtomicExpansionKind
18654 X86TargetLowering::shouldExpandAtomicLoadInIR(LoadInst *LI) const {
18655 auto PTy = cast<PointerType>(LI->getPointerOperand()->getType());
18656 return needsCmpXchgNb(PTy->getElementType()) ? AtomicExpansionKind::CmpXChg
18657 : AtomicExpansionKind::None;
18660 TargetLowering::AtomicExpansionKind
18661 X86TargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const {
18662 unsigned NativeWidth = Subtarget->is64Bit() ? 64 : 32;
18663 Type *MemType = AI->getType();
18665 // If the operand is too big, we must see if cmpxchg8/16b is available
18666 // and default to library calls otherwise.
18667 if (MemType->getPrimitiveSizeInBits() > NativeWidth) {
18668 return needsCmpXchgNb(MemType) ? AtomicExpansionKind::CmpXChg
18669 : AtomicExpansionKind::None;
18672 AtomicRMWInst::BinOp Op = AI->getOperation();
18675 llvm_unreachable("Unknown atomic operation");
18676 case AtomicRMWInst::Xchg:
18677 case AtomicRMWInst::Add:
18678 case AtomicRMWInst::Sub:
18679 // It's better to use xadd, xsub or xchg for these in all cases.
18680 return AtomicExpansionKind::None;
18681 case AtomicRMWInst::Or:
18682 case AtomicRMWInst::And:
18683 case AtomicRMWInst::Xor:
18684 // If the atomicrmw's result isn't actually used, we can just add a "lock"
18685 // prefix to a normal instruction for these operations.
18686 return !AI->use_empty() ? AtomicExpansionKind::CmpXChg
18687 : AtomicExpansionKind::None;
18688 case AtomicRMWInst::Nand:
18689 case AtomicRMWInst::Max:
18690 case AtomicRMWInst::Min:
18691 case AtomicRMWInst::UMax:
18692 case AtomicRMWInst::UMin:
18693 // These always require a non-trivial set of data operations on x86. We must
18694 // use a cmpxchg loop.
18695 return AtomicExpansionKind::CmpXChg;
18699 static bool hasMFENCE(const X86Subtarget& Subtarget) {
18700 // Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
18701 // no-sse2). There isn't any reason to disable it if the target processor
18703 return Subtarget.hasSSE2() || Subtarget.is64Bit();
18707 X86TargetLowering::lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *AI) const {
18708 unsigned NativeWidth = Subtarget->is64Bit() ? 64 : 32;
18709 Type *MemType = AI->getType();
18710 // Accesses larger than the native width are turned into cmpxchg/libcalls, so
18711 // there is no benefit in turning such RMWs into loads, and it is actually
18712 // harmful as it introduces a mfence.
18713 if (MemType->getPrimitiveSizeInBits() > NativeWidth)
18716 auto Builder = IRBuilder<>(AI);
18717 Module *M = Builder.GetInsertBlock()->getParent()->getParent();
18718 auto SynchScope = AI->getSynchScope();
18719 // We must restrict the ordering to avoid generating loads with Release or
18720 // ReleaseAcquire orderings.
18721 auto Order = AtomicCmpXchgInst::getStrongestFailureOrdering(AI->getOrdering());
18722 auto Ptr = AI->getPointerOperand();
18724 // Before the load we need a fence. Here is an example lifted from
18725 // http://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf showing why a fence
18728 // x.store(1, relaxed);
18729 // r1 = y.fetch_add(0, release);
18731 // y.fetch_add(42, acquire);
18732 // r2 = x.load(relaxed);
18733 // r1 = r2 = 0 is impossible, but becomes possible if the idempotent rmw is
18734 // lowered to just a load without a fence. A mfence flushes the store buffer,
18735 // making the optimization clearly correct.
18736 // FIXME: it is required if isAtLeastRelease(Order) but it is not clear
18737 // otherwise, we might be able to be more aggressive on relaxed idempotent
18738 // rmw. In practice, they do not look useful, so we don't try to be
18739 // especially clever.
18740 if (SynchScope == SingleThread)
18741 // FIXME: we could just insert an X86ISD::MEMBARRIER here, except we are at
18742 // the IR level, so we must wrap it in an intrinsic.
18745 if (!hasMFENCE(*Subtarget))
18746 // FIXME: it might make sense to use a locked operation here but on a
18747 // different cache-line to prevent cache-line bouncing. In practice it
18748 // is probably a small win, and x86 processors without mfence are rare
18749 // enough that we do not bother.
18753 llvm::Intrinsic::getDeclaration(M, Intrinsic::x86_sse2_mfence);
18754 Builder.CreateCall(MFence, {});
18756 // Finally we can emit the atomic load.
18757 LoadInst *Loaded = Builder.CreateAlignedLoad(Ptr,
18758 AI->getType()->getPrimitiveSizeInBits());
18759 Loaded->setAtomic(Order, SynchScope);
18760 AI->replaceAllUsesWith(Loaded);
18761 AI->eraseFromParent();
18765 static SDValue LowerATOMIC_FENCE(SDValue Op, const X86Subtarget *Subtarget,
18766 SelectionDAG &DAG) {
18768 AtomicOrdering FenceOrdering = static_cast<AtomicOrdering>(
18769 cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue());
18770 SynchronizationScope FenceScope = static_cast<SynchronizationScope>(
18771 cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue());
18773 // The only fence that needs an instruction is a sequentially-consistent
18774 // cross-thread fence.
18775 if (FenceOrdering == SequentiallyConsistent && FenceScope == CrossThread) {
18776 if (hasMFENCE(*Subtarget))
18777 return DAG.getNode(X86ISD::MFENCE, dl, MVT::Other, Op.getOperand(0));
18779 SDValue Chain = Op.getOperand(0);
18780 SDValue Zero = DAG.getConstant(0, dl, MVT::i32);
18782 DAG.getRegister(X86::ESP, MVT::i32), // Base
18783 DAG.getTargetConstant(1, dl, MVT::i8), // Scale
18784 DAG.getRegister(0, MVT::i32), // Index
18785 DAG.getTargetConstant(0, dl, MVT::i32), // Disp
18786 DAG.getRegister(0, MVT::i32), // Segment.
18790 SDNode *Res = DAG.getMachineNode(X86::OR32mrLocked, dl, MVT::Other, Ops);
18791 return SDValue(Res, 0);
18794 // MEMBARRIER is a compiler barrier; it codegens to a no-op.
18795 return DAG.getNode(X86ISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
18798 static SDValue LowerCMP_SWAP(SDValue Op, const X86Subtarget *Subtarget,
18799 SelectionDAG &DAG) {
18800 MVT T = Op.getSimpleValueType();
18804 switch(T.SimpleTy) {
18805 default: llvm_unreachable("Invalid value type!");
18806 case MVT::i8: Reg = X86::AL; size = 1; break;
18807 case MVT::i16: Reg = X86::AX; size = 2; break;
18808 case MVT::i32: Reg = X86::EAX; size = 4; break;
18810 assert(Subtarget->is64Bit() && "Node not type legal!");
18811 Reg = X86::RAX; size = 8;
18814 SDValue cpIn = DAG.getCopyToReg(Op.getOperand(0), DL, Reg,
18815 Op.getOperand(2), SDValue());
18816 SDValue Ops[] = { cpIn.getValue(0),
18819 DAG.getTargetConstant(size, DL, MVT::i8),
18820 cpIn.getValue(1) };
18821 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
18822 MachineMemOperand *MMO = cast<AtomicSDNode>(Op)->getMemOperand();
18823 SDValue Result = DAG.getMemIntrinsicNode(X86ISD::LCMPXCHG_DAG, DL, Tys,
18827 DAG.getCopyFromReg(Result.getValue(0), DL, Reg, T, Result.getValue(1));
18828 SDValue EFLAGS = DAG.getCopyFromReg(cpOut.getValue(1), DL, X86::EFLAGS,
18829 MVT::i32, cpOut.getValue(2));
18830 SDValue Success = DAG.getNode(X86ISD::SETCC, DL, Op->getValueType(1),
18831 DAG.getConstant(X86::COND_E, DL, MVT::i8),
18834 DAG.ReplaceAllUsesOfValueWith(Op.getValue(0), cpOut);
18835 DAG.ReplaceAllUsesOfValueWith(Op.getValue(1), Success);
18836 DAG.ReplaceAllUsesOfValueWith(Op.getValue(2), EFLAGS.getValue(1));
18840 static SDValue LowerBITCAST(SDValue Op, const X86Subtarget *Subtarget,
18841 SelectionDAG &DAG) {
18842 MVT SrcVT = Op.getOperand(0).getSimpleValueType();
18843 MVT DstVT = Op.getSimpleValueType();
18845 if (SrcVT == MVT::v2i32 || SrcVT == MVT::v4i16 || SrcVT == MVT::v8i8) {
18846 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
18847 if (DstVT != MVT::f64)
18848 // This conversion needs to be expanded.
18851 SDValue InVec = Op->getOperand(0);
18853 unsigned NumElts = SrcVT.getVectorNumElements();
18854 EVT SVT = SrcVT.getVectorElementType();
18856 // Widen the vector in input in the case of MVT::v2i32.
18857 // Example: from MVT::v2i32 to MVT::v4i32.
18858 SmallVector<SDValue, 16> Elts;
18859 for (unsigned i = 0, e = NumElts; i != e; ++i)
18860 Elts.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SVT, InVec,
18861 DAG.getIntPtrConstant(i, dl)));
18863 // Explicitly mark the extra elements as Undef.
18864 Elts.append(NumElts, DAG.getUNDEF(SVT));
18866 EVT NewVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumElts * 2);
18867 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Elts);
18868 SDValue ToV2F64 = DAG.getBitcast(MVT::v2f64, BV);
18869 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, ToV2F64,
18870 DAG.getIntPtrConstant(0, dl));
18873 assert(Subtarget->is64Bit() && !Subtarget->hasSSE2() &&
18874 Subtarget->hasMMX() && "Unexpected custom BITCAST");
18875 assert((DstVT == MVT::i64 ||
18876 (DstVT.isVector() && DstVT.getSizeInBits()==64)) &&
18877 "Unexpected custom BITCAST");
18878 // i64 <=> MMX conversions are Legal.
18879 if (SrcVT==MVT::i64 && DstVT.isVector())
18881 if (DstVT==MVT::i64 && SrcVT.isVector())
18883 // MMX <=> MMX conversions are Legal.
18884 if (SrcVT.isVector() && DstVT.isVector())
18886 // All other conversions need to be expanded.
18890 /// Compute the horizontal sum of bytes in V for the elements of VT.
18892 /// Requires V to be a byte vector and VT to be an integer vector type with
18893 /// wider elements than V's type. The width of the elements of VT determines
18894 /// how many bytes of V are summed horizontally to produce each element of the
18896 static SDValue LowerHorizontalByteSum(SDValue V, MVT VT,
18897 const X86Subtarget *Subtarget,
18898 SelectionDAG &DAG) {
18900 MVT ByteVecVT = V.getSimpleValueType();
18901 MVT EltVT = VT.getVectorElementType();
18902 int NumElts = VT.getVectorNumElements();
18903 assert(ByteVecVT.getVectorElementType() == MVT::i8 &&
18904 "Expected value to have byte element type.");
18905 assert(EltVT != MVT::i8 &&
18906 "Horizontal byte sum only makes sense for wider elements!");
18907 unsigned VecSize = VT.getSizeInBits();
18908 assert(ByteVecVT.getSizeInBits() == VecSize && "Cannot change vector size!");
18910 // PSADBW instruction horizontally add all bytes and leave the result in i64
18911 // chunks, thus directly computes the pop count for v2i64 and v4i64.
18912 if (EltVT == MVT::i64) {
18913 SDValue Zeros = getZeroVector(ByteVecVT, Subtarget, DAG, DL);
18914 V = DAG.getNode(X86ISD::PSADBW, DL, ByteVecVT, V, Zeros);
18915 return DAG.getBitcast(VT, V);
18918 if (EltVT == MVT::i32) {
18919 // We unpack the low half and high half into i32s interleaved with zeros so
18920 // that we can use PSADBW to horizontally sum them. The most useful part of
18921 // this is that it lines up the results of two PSADBW instructions to be
18922 // two v2i64 vectors which concatenated are the 4 population counts. We can
18923 // then use PACKUSWB to shrink and concatenate them into a v4i32 again.
18924 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, DL);
18925 SDValue Low = DAG.getNode(X86ISD::UNPCKL, DL, VT, V, Zeros);
18926 SDValue High = DAG.getNode(X86ISD::UNPCKH, DL, VT, V, Zeros);
18928 // Do the horizontal sums into two v2i64s.
18929 Zeros = getZeroVector(ByteVecVT, Subtarget, DAG, DL);
18930 Low = DAG.getNode(X86ISD::PSADBW, DL, ByteVecVT,
18931 DAG.getBitcast(ByteVecVT, Low), Zeros);
18932 High = DAG.getNode(X86ISD::PSADBW, DL, ByteVecVT,
18933 DAG.getBitcast(ByteVecVT, High), Zeros);
18935 // Merge them together.
18936 MVT ShortVecVT = MVT::getVectorVT(MVT::i16, VecSize / 16);
18937 V = DAG.getNode(X86ISD::PACKUS, DL, ByteVecVT,
18938 DAG.getBitcast(ShortVecVT, Low),
18939 DAG.getBitcast(ShortVecVT, High));
18941 return DAG.getBitcast(VT, V);
18944 // The only element type left is i16.
18945 assert(EltVT == MVT::i16 && "Unknown how to handle type");
18947 // To obtain pop count for each i16 element starting from the pop count for
18948 // i8 elements, shift the i16s left by 8, sum as i8s, and then shift as i16s
18949 // right by 8. It is important to shift as i16s as i8 vector shift isn't
18950 // directly supported.
18951 SmallVector<SDValue, 16> Shifters(NumElts, DAG.getConstant(8, DL, EltVT));
18952 SDValue Shifter = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Shifters);
18953 SDValue Shl = DAG.getNode(ISD::SHL, DL, VT, DAG.getBitcast(VT, V), Shifter);
18954 V = DAG.getNode(ISD::ADD, DL, ByteVecVT, DAG.getBitcast(ByteVecVT, Shl),
18955 DAG.getBitcast(ByteVecVT, V));
18956 return DAG.getNode(ISD::SRL, DL, VT, DAG.getBitcast(VT, V), Shifter);
18959 static SDValue LowerVectorCTPOPInRegLUT(SDValue Op, SDLoc DL,
18960 const X86Subtarget *Subtarget,
18961 SelectionDAG &DAG) {
18962 MVT VT = Op.getSimpleValueType();
18963 MVT EltVT = VT.getVectorElementType();
18964 unsigned VecSize = VT.getSizeInBits();
18966 // Implement a lookup table in register by using an algorithm based on:
18967 // http://wm.ite.pl/articles/sse-popcount.html
18969 // The general idea is that every lower byte nibble in the input vector is an
18970 // index into a in-register pre-computed pop count table. We then split up the
18971 // input vector in two new ones: (1) a vector with only the shifted-right
18972 // higher nibbles for each byte and (2) a vector with the lower nibbles (and
18973 // masked out higher ones) for each byte. PSHUB is used separately with both
18974 // to index the in-register table. Next, both are added and the result is a
18975 // i8 vector where each element contains the pop count for input byte.
18977 // To obtain the pop count for elements != i8, we follow up with the same
18978 // approach and use additional tricks as described below.
18980 const int LUT[16] = {/* 0 */ 0, /* 1 */ 1, /* 2 */ 1, /* 3 */ 2,
18981 /* 4 */ 1, /* 5 */ 2, /* 6 */ 2, /* 7 */ 3,
18982 /* 8 */ 1, /* 9 */ 2, /* a */ 2, /* b */ 3,
18983 /* c */ 2, /* d */ 3, /* e */ 3, /* f */ 4};
18985 int NumByteElts = VecSize / 8;
18986 MVT ByteVecVT = MVT::getVectorVT(MVT::i8, NumByteElts);
18987 SDValue In = DAG.getBitcast(ByteVecVT, Op);
18988 SmallVector<SDValue, 16> LUTVec;
18989 for (int i = 0; i < NumByteElts; ++i)
18990 LUTVec.push_back(DAG.getConstant(LUT[i % 16], DL, MVT::i8));
18991 SDValue InRegLUT = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, LUTVec);
18992 SmallVector<SDValue, 16> Mask0F(NumByteElts,
18993 DAG.getConstant(0x0F, DL, MVT::i8));
18994 SDValue M0F = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, Mask0F);
18997 SmallVector<SDValue, 16> Four(NumByteElts, DAG.getConstant(4, DL, MVT::i8));
18998 SDValue FourV = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, Four);
18999 SDValue HighNibbles = DAG.getNode(ISD::SRL, DL, ByteVecVT, In, FourV);
19002 SDValue LowNibbles = DAG.getNode(ISD::AND, DL, ByteVecVT, In, M0F);
19004 // The input vector is used as the shuffle mask that index elements into the
19005 // LUT. After counting low and high nibbles, add the vector to obtain the
19006 // final pop count per i8 element.
19007 SDValue HighPopCnt =
19008 DAG.getNode(X86ISD::PSHUFB, DL, ByteVecVT, InRegLUT, HighNibbles);
19009 SDValue LowPopCnt =
19010 DAG.getNode(X86ISD::PSHUFB, DL, ByteVecVT, InRegLUT, LowNibbles);
19011 SDValue PopCnt = DAG.getNode(ISD::ADD, DL, ByteVecVT, HighPopCnt, LowPopCnt);
19013 if (EltVT == MVT::i8)
19016 return LowerHorizontalByteSum(PopCnt, VT, Subtarget, DAG);
19019 static SDValue LowerVectorCTPOPBitmath(SDValue Op, SDLoc DL,
19020 const X86Subtarget *Subtarget,
19021 SelectionDAG &DAG) {
19022 MVT VT = Op.getSimpleValueType();
19023 assert(VT.is128BitVector() &&
19024 "Only 128-bit vector bitmath lowering supported.");
19026 int VecSize = VT.getSizeInBits();
19027 MVT EltVT = VT.getVectorElementType();
19028 int Len = EltVT.getSizeInBits();
19030 // This is the vectorized version of the "best" algorithm from
19031 // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
19032 // with a minor tweak to use a series of adds + shifts instead of vector
19033 // multiplications. Implemented for all integer vector types. We only use
19034 // this when we don't have SSSE3 which allows a LUT-based lowering that is
19035 // much faster, even faster than using native popcnt instructions.
19037 auto GetShift = [&](unsigned OpCode, SDValue V, int Shifter) {
19038 MVT VT = V.getSimpleValueType();
19039 SmallVector<SDValue, 32> Shifters(
19040 VT.getVectorNumElements(),
19041 DAG.getConstant(Shifter, DL, VT.getVectorElementType()));
19042 return DAG.getNode(OpCode, DL, VT, V,
19043 DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Shifters));
19045 auto GetMask = [&](SDValue V, APInt Mask) {
19046 MVT VT = V.getSimpleValueType();
19047 SmallVector<SDValue, 32> Masks(
19048 VT.getVectorNumElements(),
19049 DAG.getConstant(Mask, DL, VT.getVectorElementType()));
19050 return DAG.getNode(ISD::AND, DL, VT, V,
19051 DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Masks));
19054 // We don't want to incur the implicit masks required to SRL vNi8 vectors on
19055 // x86, so set the SRL type to have elements at least i16 wide. This is
19056 // correct because all of our SRLs are followed immediately by a mask anyways
19057 // that handles any bits that sneak into the high bits of the byte elements.
19058 MVT SrlVT = Len > 8 ? VT : MVT::getVectorVT(MVT::i16, VecSize / 16);
19062 // v = v - ((v >> 1) & 0x55555555...)
19064 DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 1));
19065 SDValue And = GetMask(Srl, APInt::getSplat(Len, APInt(8, 0x55)));
19066 V = DAG.getNode(ISD::SUB, DL, VT, V, And);
19068 // v = (v & 0x33333333...) + ((v >> 2) & 0x33333333...)
19069 SDValue AndLHS = GetMask(V, APInt::getSplat(Len, APInt(8, 0x33)));
19070 Srl = DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 2));
19071 SDValue AndRHS = GetMask(Srl, APInt::getSplat(Len, APInt(8, 0x33)));
19072 V = DAG.getNode(ISD::ADD, DL, VT, AndLHS, AndRHS);
19074 // v = (v + (v >> 4)) & 0x0F0F0F0F...
19075 Srl = DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 4));
19076 SDValue Add = DAG.getNode(ISD::ADD, DL, VT, V, Srl);
19077 V = GetMask(Add, APInt::getSplat(Len, APInt(8, 0x0F)));
19079 // At this point, V contains the byte-wise population count, and we are
19080 // merely doing a horizontal sum if necessary to get the wider element
19082 if (EltVT == MVT::i8)
19085 return LowerHorizontalByteSum(
19086 DAG.getBitcast(MVT::getVectorVT(MVT::i8, VecSize / 8), V), VT, Subtarget,
19090 static SDValue LowerVectorCTPOP(SDValue Op, const X86Subtarget *Subtarget,
19091 SelectionDAG &DAG) {
19092 MVT VT = Op.getSimpleValueType();
19093 // FIXME: Need to add AVX-512 support here!
19094 assert((VT.is256BitVector() || VT.is128BitVector()) &&
19095 "Unknown CTPOP type to handle");
19096 SDLoc DL(Op.getNode());
19097 SDValue Op0 = Op.getOperand(0);
19099 if (!Subtarget->hasSSSE3()) {
19100 // We can't use the fast LUT approach, so fall back on vectorized bitmath.
19101 assert(VT.is128BitVector() && "Only 128-bit vectors supported in SSE!");
19102 return LowerVectorCTPOPBitmath(Op0, DL, Subtarget, DAG);
19105 if (VT.is256BitVector() && !Subtarget->hasInt256()) {
19106 unsigned NumElems = VT.getVectorNumElements();
19108 // Extract each 128-bit vector, compute pop count and concat the result.
19109 SDValue LHS = Extract128BitVector(Op0, 0, DAG, DL);
19110 SDValue RHS = Extract128BitVector(Op0, NumElems/2, DAG, DL);
19112 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT,
19113 LowerVectorCTPOPInRegLUT(LHS, DL, Subtarget, DAG),
19114 LowerVectorCTPOPInRegLUT(RHS, DL, Subtarget, DAG));
19117 return LowerVectorCTPOPInRegLUT(Op0, DL, Subtarget, DAG);
19120 static SDValue LowerCTPOP(SDValue Op, const X86Subtarget *Subtarget,
19121 SelectionDAG &DAG) {
19122 assert(Op.getValueType().isVector() &&
19123 "We only do custom lowering for vector population count.");
19124 return LowerVectorCTPOP(Op, Subtarget, DAG);
19127 static SDValue LowerLOAD_SUB(SDValue Op, SelectionDAG &DAG) {
19128 SDNode *Node = Op.getNode();
19130 EVT T = Node->getValueType(0);
19131 SDValue negOp = DAG.getNode(ISD::SUB, dl, T,
19132 DAG.getConstant(0, dl, T), Node->getOperand(2));
19133 return DAG.getAtomic(ISD::ATOMIC_LOAD_ADD, dl,
19134 cast<AtomicSDNode>(Node)->getMemoryVT(),
19135 Node->getOperand(0),
19136 Node->getOperand(1), negOp,
19137 cast<AtomicSDNode>(Node)->getMemOperand(),
19138 cast<AtomicSDNode>(Node)->getOrdering(),
19139 cast<AtomicSDNode>(Node)->getSynchScope());
19142 static SDValue LowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) {
19143 SDNode *Node = Op.getNode();
19145 EVT VT = cast<AtomicSDNode>(Node)->getMemoryVT();
19147 // Convert seq_cst store -> xchg
19148 // Convert wide store -> swap (-> cmpxchg8b/cmpxchg16b)
19149 // FIXME: On 32-bit, store -> fist or movq would be more efficient
19150 // (The only way to get a 16-byte store is cmpxchg16b)
19151 // FIXME: 16-byte ATOMIC_SWAP isn't actually hooked up at the moment.
19152 if (cast<AtomicSDNode>(Node)->getOrdering() == SequentiallyConsistent ||
19153 !DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
19154 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
19155 cast<AtomicSDNode>(Node)->getMemoryVT(),
19156 Node->getOperand(0),
19157 Node->getOperand(1), Node->getOperand(2),
19158 cast<AtomicSDNode>(Node)->getMemOperand(),
19159 cast<AtomicSDNode>(Node)->getOrdering(),
19160 cast<AtomicSDNode>(Node)->getSynchScope());
19161 return Swap.getValue(1);
19163 // Other atomic stores have a simple pattern.
19167 static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
19168 EVT VT = Op.getNode()->getSimpleValueType(0);
19170 // Let legalize expand this if it isn't a legal type yet.
19171 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
19174 SDVTList VTs = DAG.getVTList(VT, MVT::i32);
19177 bool ExtraOp = false;
19178 switch (Op.getOpcode()) {
19179 default: llvm_unreachable("Invalid code");
19180 case ISD::ADDC: Opc = X86ISD::ADD; break;
19181 case ISD::ADDE: Opc = X86ISD::ADC; ExtraOp = true; break;
19182 case ISD::SUBC: Opc = X86ISD::SUB; break;
19183 case ISD::SUBE: Opc = X86ISD::SBB; ExtraOp = true; break;
19187 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0),
19189 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0),
19190 Op.getOperand(1), Op.getOperand(2));
19193 static SDValue LowerFSINCOS(SDValue Op, const X86Subtarget *Subtarget,
19194 SelectionDAG &DAG) {
19195 assert(Subtarget->isTargetDarwin() && Subtarget->is64Bit());
19197 // For MacOSX, we want to call an alternative entry point: __sincos_stret,
19198 // which returns the values as { float, float } (in XMM0) or
19199 // { double, double } (which is returned in XMM0, XMM1).
19201 SDValue Arg = Op.getOperand(0);
19202 EVT ArgVT = Arg.getValueType();
19203 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
19205 TargetLowering::ArgListTy Args;
19206 TargetLowering::ArgListEntry Entry;
19210 Entry.isSExt = false;
19211 Entry.isZExt = false;
19212 Args.push_back(Entry);
19214 bool isF64 = ArgVT == MVT::f64;
19215 // Only optimize x86_64 for now. i386 is a bit messy. For f32,
19216 // the small struct {f32, f32} is returned in (eax, edx). For f64,
19217 // the results are returned via SRet in memory.
19218 const char *LibcallName = isF64 ? "__sincos_stret" : "__sincosf_stret";
19219 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
19221 DAG.getExternalSymbol(LibcallName, TLI.getPointerTy(DAG.getDataLayout()));
19223 Type *RetTy = isF64
19224 ? (Type*)StructType::get(ArgTy, ArgTy, nullptr)
19225 : (Type*)VectorType::get(ArgTy, 4);
19227 TargetLowering::CallLoweringInfo CLI(DAG);
19228 CLI.setDebugLoc(dl).setChain(DAG.getEntryNode())
19229 .setCallee(CallingConv::C, RetTy, Callee, std::move(Args), 0);
19231 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
19234 // Returned in xmm0 and xmm1.
19235 return CallResult.first;
19237 // Returned in bits 0:31 and 32:64 xmm0.
19238 SDValue SinVal = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ArgVT,
19239 CallResult.first, DAG.getIntPtrConstant(0, dl));
19240 SDValue CosVal = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ArgVT,
19241 CallResult.first, DAG.getIntPtrConstant(1, dl));
19242 SDVTList Tys = DAG.getVTList(ArgVT, ArgVT);
19243 return DAG.getNode(ISD::MERGE_VALUES, dl, Tys, SinVal, CosVal);
19246 static SDValue LowerMSCATTER(SDValue Op, const X86Subtarget *Subtarget,
19247 SelectionDAG &DAG) {
19248 assert(Subtarget->hasAVX512() &&
19249 "MGATHER/MSCATTER are supported on AVX-512 arch only");
19251 MaskedScatterSDNode *N = cast<MaskedScatterSDNode>(Op.getNode());
19252 EVT VT = N->getValue().getValueType();
19253 assert(VT.getScalarSizeInBits() >= 32 && "Unsupported scatter op");
19256 // X86 scatter kills mask register, so its type should be added to
19257 // the list of return values
19258 if (N->getNumValues() == 1) {
19259 SDValue Index = N->getIndex();
19260 if (!Subtarget->hasVLX() && !VT.is512BitVector() &&
19261 !Index.getValueType().is512BitVector())
19262 Index = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i64, Index);
19264 SDVTList VTs = DAG.getVTList(N->getMask().getValueType(), MVT::Other);
19265 SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2),
19266 N->getOperand(3), Index };
19268 SDValue NewScatter = DAG.getMaskedScatter(VTs, VT, dl, Ops, N->getMemOperand());
19269 DAG.ReplaceAllUsesWith(Op, SDValue(NewScatter.getNode(), 1));
19270 return SDValue(NewScatter.getNode(), 0);
19275 static SDValue LowerMGATHER(SDValue Op, const X86Subtarget *Subtarget,
19276 SelectionDAG &DAG) {
19277 assert(Subtarget->hasAVX512() &&
19278 "MGATHER/MSCATTER are supported on AVX-512 arch only");
19280 MaskedGatherSDNode *N = cast<MaskedGatherSDNode>(Op.getNode());
19281 EVT VT = Op.getValueType();
19282 assert(VT.getScalarSizeInBits() >= 32 && "Unsupported gather op");
19285 SDValue Index = N->getIndex();
19286 if (!Subtarget->hasVLX() && !VT.is512BitVector() &&
19287 !Index.getValueType().is512BitVector()) {
19288 Index = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i64, Index);
19289 SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2),
19290 N->getOperand(3), Index };
19291 DAG.UpdateNodeOperands(N, Ops);
19296 SDValue X86TargetLowering::LowerGC_TRANSITION_START(SDValue Op,
19297 SelectionDAG &DAG) const {
19298 // TODO: Eventually, the lowering of these nodes should be informed by or
19299 // deferred to the GC strategy for the function in which they appear. For
19300 // now, however, they must be lowered to something. Since they are logically
19301 // no-ops in the case of a null GC strategy (or a GC strategy which does not
19302 // require special handling for these nodes), lower them as literal NOOPs for
19304 SmallVector<SDValue, 2> Ops;
19306 Ops.push_back(Op.getOperand(0));
19307 if (Op->getGluedNode())
19308 Ops.push_back(Op->getOperand(Op->getNumOperands() - 1));
19311 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
19312 SDValue NOOP(DAG.getMachineNode(X86::NOOP, SDLoc(Op), VTs, Ops), 0);
19317 SDValue X86TargetLowering::LowerGC_TRANSITION_END(SDValue Op,
19318 SelectionDAG &DAG) const {
19319 // TODO: Eventually, the lowering of these nodes should be informed by or
19320 // deferred to the GC strategy for the function in which they appear. For
19321 // now, however, they must be lowered to something. Since they are logically
19322 // no-ops in the case of a null GC strategy (or a GC strategy which does not
19323 // require special handling for these nodes), lower them as literal NOOPs for
19325 SmallVector<SDValue, 2> Ops;
19327 Ops.push_back(Op.getOperand(0));
19328 if (Op->getGluedNode())
19329 Ops.push_back(Op->getOperand(Op->getNumOperands() - 1));
19332 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
19333 SDValue NOOP(DAG.getMachineNode(X86::NOOP, SDLoc(Op), VTs, Ops), 0);
19338 /// LowerOperation - Provide custom lowering hooks for some operations.
19340 SDValue X86TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
19341 switch (Op.getOpcode()) {
19342 default: llvm_unreachable("Should not custom lower this!");
19343 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, Subtarget, DAG);
19344 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
19345 return LowerCMP_SWAP(Op, Subtarget, DAG);
19346 case ISD::CTPOP: return LowerCTPOP(Op, Subtarget, DAG);
19347 case ISD::ATOMIC_LOAD_SUB: return LowerLOAD_SUB(Op,DAG);
19348 case ISD::ATOMIC_STORE: return LowerATOMIC_STORE(Op,DAG);
19349 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
19350 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, Subtarget, DAG);
19351 case ISD::VECTOR_SHUFFLE: return lowerVectorShuffle(Op, Subtarget, DAG);
19352 case ISD::VSELECT: return LowerVSELECT(Op, DAG);
19353 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
19354 case ISD::INSERT_VECTOR_ELT: return LowerINSERT_VECTOR_ELT(Op, DAG);
19355 case ISD::EXTRACT_SUBVECTOR: return LowerEXTRACT_SUBVECTOR(Op,Subtarget,DAG);
19356 case ISD::INSERT_SUBVECTOR: return LowerINSERT_SUBVECTOR(Op, Subtarget,DAG);
19357 case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
19358 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
19359 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
19360 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
19361 case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
19362 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
19363 case ISD::SHL_PARTS:
19364 case ISD::SRA_PARTS:
19365 case ISD::SRL_PARTS: return LowerShiftParts(Op, DAG);
19366 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
19367 case ISD::UINT_TO_FP: return LowerUINT_TO_FP(Op, DAG);
19368 case ISD::TRUNCATE: return LowerTRUNCATE(Op, DAG);
19369 case ISD::ZERO_EXTEND: return LowerZERO_EXTEND(Op, Subtarget, DAG);
19370 case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, Subtarget, DAG);
19371 case ISD::ANY_EXTEND: return LowerANY_EXTEND(Op, Subtarget, DAG);
19372 case ISD::SIGN_EXTEND_VECTOR_INREG:
19373 return LowerSIGN_EXTEND_VECTOR_INREG(Op, Subtarget, DAG);
19374 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
19375 case ISD::FP_TO_UINT: return LowerFP_TO_UINT(Op, DAG);
19376 case ISD::FP_EXTEND: return LowerFP_EXTEND(Op, DAG);
19377 case ISD::LOAD: return LowerExtendedLoad(Op, Subtarget, DAG);
19379 case ISD::FNEG: return LowerFABSorFNEG(Op, DAG);
19380 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
19381 case ISD::FGETSIGN: return LowerFGETSIGN(Op, DAG);
19382 case ISD::SETCC: return LowerSETCC(Op, DAG);
19383 case ISD::SELECT: return LowerSELECT(Op, DAG);
19384 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
19385 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
19386 case ISD::VASTART: return LowerVASTART(Op, DAG);
19387 case ISD::VAARG: return LowerVAARG(Op, DAG);
19388 case ISD::VACOPY: return LowerVACOPY(Op, Subtarget, DAG);
19389 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, Subtarget, DAG);
19390 case ISD::INTRINSIC_VOID:
19391 case ISD::INTRINSIC_W_CHAIN: return LowerINTRINSIC_W_CHAIN(Op, Subtarget, DAG);
19392 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
19393 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
19394 case ISD::FRAME_TO_ARGS_OFFSET:
19395 return LowerFRAME_TO_ARGS_OFFSET(Op, DAG);
19396 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
19397 case ISD::EH_RETURN: return LowerEH_RETURN(Op, DAG);
19398 case ISD::EH_SJLJ_SETJMP: return lowerEH_SJLJ_SETJMP(Op, DAG);
19399 case ISD::EH_SJLJ_LONGJMP: return lowerEH_SJLJ_LONGJMP(Op, DAG);
19400 case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
19401 case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
19402 case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
19403 case ISD::CTLZ: return LowerCTLZ(Op, DAG);
19404 case ISD::CTLZ_ZERO_UNDEF: return LowerCTLZ_ZERO_UNDEF(Op, DAG);
19406 case ISD::CTTZ_ZERO_UNDEF: return LowerCTTZ(Op, DAG);
19407 case ISD::MUL: return LowerMUL(Op, Subtarget, DAG);
19408 case ISD::UMUL_LOHI:
19409 case ISD::SMUL_LOHI: return LowerMUL_LOHI(Op, Subtarget, DAG);
19412 case ISD::SHL: return LowerShift(Op, Subtarget, DAG);
19418 case ISD::UMULO: return LowerXALUO(Op, DAG);
19419 case ISD::READCYCLECOUNTER: return LowerREADCYCLECOUNTER(Op, Subtarget,DAG);
19420 case ISD::BITCAST: return LowerBITCAST(Op, Subtarget, DAG);
19424 case ISD::SUBE: return LowerADDC_ADDE_SUBC_SUBE(Op, DAG);
19425 case ISD::ADD: return LowerADD(Op, DAG);
19426 case ISD::SUB: return LowerSUB(Op, DAG);
19430 case ISD::UMIN: return LowerMINMAX(Op, DAG);
19431 case ISD::FSINCOS: return LowerFSINCOS(Op, Subtarget, DAG);
19432 case ISD::MGATHER: return LowerMGATHER(Op, Subtarget, DAG);
19433 case ISD::MSCATTER: return LowerMSCATTER(Op, Subtarget, DAG);
19434 case ISD::GC_TRANSITION_START:
19435 return LowerGC_TRANSITION_START(Op, DAG);
19436 case ISD::GC_TRANSITION_END: return LowerGC_TRANSITION_END(Op, DAG);
19440 /// ReplaceNodeResults - Replace a node with an illegal result type
19441 /// with a new node built out of custom code.
19442 void X86TargetLowering::ReplaceNodeResults(SDNode *N,
19443 SmallVectorImpl<SDValue>&Results,
19444 SelectionDAG &DAG) const {
19446 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
19447 switch (N->getOpcode()) {
19449 llvm_unreachable("Do not know how to custom type legalize this operation!");
19450 // We might have generated v2f32 FMIN/FMAX operations. Widen them to v4f32.
19451 case X86ISD::FMINC:
19453 case X86ISD::FMAXC:
19454 case X86ISD::FMAX: {
19455 EVT VT = N->getValueType(0);
19456 if (VT != MVT::v2f32)
19457 llvm_unreachable("Unexpected type (!= v2f32) on FMIN/FMAX.");
19458 SDValue UNDEF = DAG.getUNDEF(VT);
19459 SDValue LHS = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4f32,
19460 N->getOperand(0), UNDEF);
19461 SDValue RHS = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4f32,
19462 N->getOperand(1), UNDEF);
19463 Results.push_back(DAG.getNode(N->getOpcode(), dl, MVT::v4f32, LHS, RHS));
19466 case ISD::SIGN_EXTEND_INREG:
19471 // We don't want to expand or promote these.
19478 case ISD::UDIVREM: {
19479 SDValue V = LowerWin64_i128OP(SDValue(N,0), DAG);
19480 Results.push_back(V);
19483 case ISD::FP_TO_SINT:
19484 case ISD::FP_TO_UINT: {
19485 bool IsSigned = N->getOpcode() == ISD::FP_TO_SINT;
19487 std::pair<SDValue,SDValue> Vals =
19488 FP_TO_INTHelper(SDValue(N, 0), DAG, IsSigned, /*IsReplace=*/ true);
19489 SDValue FIST = Vals.first, StackSlot = Vals.second;
19490 if (FIST.getNode()) {
19491 EVT VT = N->getValueType(0);
19492 // Return a load from the stack slot.
19493 if (StackSlot.getNode())
19494 Results.push_back(DAG.getLoad(VT, dl, FIST, StackSlot,
19495 MachinePointerInfo(),
19496 false, false, false, 0));
19498 Results.push_back(FIST);
19502 case ISD::UINT_TO_FP: {
19503 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
19504 if (N->getOperand(0).getValueType() != MVT::v2i32 ||
19505 N->getValueType(0) != MVT::v2f32)
19507 SDValue ZExtIn = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v2i64,
19509 SDValue Bias = DAG.getConstantFP(BitsToDouble(0x4330000000000000ULL), dl,
19511 SDValue VBias = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v2f64, Bias, Bias);
19512 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::v2i64, ZExtIn,
19513 DAG.getBitcast(MVT::v2i64, VBias));
19514 Or = DAG.getBitcast(MVT::v2f64, Or);
19515 // TODO: Are there any fast-math-flags to propagate here?
19516 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::v2f64, Or, VBias);
19517 Results.push_back(DAG.getNode(X86ISD::VFPROUND, dl, MVT::v4f32, Sub));
19520 case ISD::FP_ROUND: {
19521 if (!TLI.isTypeLegal(N->getOperand(0).getValueType()))
19523 SDValue V = DAG.getNode(X86ISD::VFPROUND, dl, MVT::v4f32, N->getOperand(0));
19524 Results.push_back(V);
19527 case ISD::FP_EXTEND: {
19528 // Right now, only MVT::v2f32 has OperationAction for FP_EXTEND.
19529 // No other ValueType for FP_EXTEND should reach this point.
19530 assert(N->getValueType(0) == MVT::v2f32 &&
19531 "Do not know how to legalize this Node");
19534 case ISD::INTRINSIC_W_CHAIN: {
19535 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
19537 default : llvm_unreachable("Do not know how to custom type "
19538 "legalize this intrinsic operation!");
19539 case Intrinsic::x86_rdtsc:
19540 return getReadTimeStampCounter(N, dl, X86ISD::RDTSC_DAG, DAG, Subtarget,
19542 case Intrinsic::x86_rdtscp:
19543 return getReadTimeStampCounter(N, dl, X86ISD::RDTSCP_DAG, DAG, Subtarget,
19545 case Intrinsic::x86_rdpmc:
19546 return getReadPerformanceCounter(N, dl, DAG, Subtarget, Results);
19549 case ISD::READCYCLECOUNTER: {
19550 return getReadTimeStampCounter(N, dl, X86ISD::RDTSC_DAG, DAG, Subtarget,
19553 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS: {
19554 EVT T = N->getValueType(0);
19555 assert((T == MVT::i64 || T == MVT::i128) && "can only expand cmpxchg pair");
19556 bool Regs64bit = T == MVT::i128;
19557 EVT HalfT = Regs64bit ? MVT::i64 : MVT::i32;
19558 SDValue cpInL, cpInH;
19559 cpInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
19560 DAG.getConstant(0, dl, HalfT));
19561 cpInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
19562 DAG.getConstant(1, dl, HalfT));
19563 cpInL = DAG.getCopyToReg(N->getOperand(0), dl,
19564 Regs64bit ? X86::RAX : X86::EAX,
19566 cpInH = DAG.getCopyToReg(cpInL.getValue(0), dl,
19567 Regs64bit ? X86::RDX : X86::EDX,
19568 cpInH, cpInL.getValue(1));
19569 SDValue swapInL, swapInH;
19570 swapInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
19571 DAG.getConstant(0, dl, HalfT));
19572 swapInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
19573 DAG.getConstant(1, dl, HalfT));
19574 swapInL = DAG.getCopyToReg(cpInH.getValue(0), dl,
19575 Regs64bit ? X86::RBX : X86::EBX,
19576 swapInL, cpInH.getValue(1));
19577 swapInH = DAG.getCopyToReg(swapInL.getValue(0), dl,
19578 Regs64bit ? X86::RCX : X86::ECX,
19579 swapInH, swapInL.getValue(1));
19580 SDValue Ops[] = { swapInH.getValue(0),
19582 swapInH.getValue(1) };
19583 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
19584 MachineMemOperand *MMO = cast<AtomicSDNode>(N)->getMemOperand();
19585 unsigned Opcode = Regs64bit ? X86ISD::LCMPXCHG16_DAG :
19586 X86ISD::LCMPXCHG8_DAG;
19587 SDValue Result = DAG.getMemIntrinsicNode(Opcode, dl, Tys, Ops, T, MMO);
19588 SDValue cpOutL = DAG.getCopyFromReg(Result.getValue(0), dl,
19589 Regs64bit ? X86::RAX : X86::EAX,
19590 HalfT, Result.getValue(1));
19591 SDValue cpOutH = DAG.getCopyFromReg(cpOutL.getValue(1), dl,
19592 Regs64bit ? X86::RDX : X86::EDX,
19593 HalfT, cpOutL.getValue(2));
19594 SDValue OpsF[] = { cpOutL.getValue(0), cpOutH.getValue(0)};
19596 SDValue EFLAGS = DAG.getCopyFromReg(cpOutH.getValue(1), dl, X86::EFLAGS,
19597 MVT::i32, cpOutH.getValue(2));
19599 DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
19600 DAG.getConstant(X86::COND_E, dl, MVT::i8), EFLAGS);
19601 Success = DAG.getZExtOrTrunc(Success, dl, N->getValueType(1));
19603 Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, T, OpsF));
19604 Results.push_back(Success);
19605 Results.push_back(EFLAGS.getValue(1));
19608 case ISD::ATOMIC_SWAP:
19609 case ISD::ATOMIC_LOAD_ADD:
19610 case ISD::ATOMIC_LOAD_SUB:
19611 case ISD::ATOMIC_LOAD_AND:
19612 case ISD::ATOMIC_LOAD_OR:
19613 case ISD::ATOMIC_LOAD_XOR:
19614 case ISD::ATOMIC_LOAD_NAND:
19615 case ISD::ATOMIC_LOAD_MIN:
19616 case ISD::ATOMIC_LOAD_MAX:
19617 case ISD::ATOMIC_LOAD_UMIN:
19618 case ISD::ATOMIC_LOAD_UMAX:
19619 case ISD::ATOMIC_LOAD: {
19620 // Delegate to generic TypeLegalization. Situations we can really handle
19621 // should have already been dealt with by AtomicExpandPass.cpp.
19624 case ISD::BITCAST: {
19625 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
19626 EVT DstVT = N->getValueType(0);
19627 EVT SrcVT = N->getOperand(0)->getValueType(0);
19629 if (SrcVT != MVT::f64 ||
19630 (DstVT != MVT::v2i32 && DstVT != MVT::v4i16 && DstVT != MVT::v8i8))
19633 unsigned NumElts = DstVT.getVectorNumElements();
19634 EVT SVT = DstVT.getVectorElementType();
19635 EVT WiderVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumElts * 2);
19636 SDValue Expanded = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
19637 MVT::v2f64, N->getOperand(0));
19638 SDValue ToVecInt = DAG.getBitcast(WiderVT, Expanded);
19640 if (ExperimentalVectorWideningLegalization) {
19641 // If we are legalizing vectors by widening, we already have the desired
19642 // legal vector type, just return it.
19643 Results.push_back(ToVecInt);
19647 SmallVector<SDValue, 8> Elts;
19648 for (unsigned i = 0, e = NumElts; i != e; ++i)
19649 Elts.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SVT,
19650 ToVecInt, DAG.getIntPtrConstant(i, dl)));
19652 Results.push_back(DAG.getNode(ISD::BUILD_VECTOR, dl, DstVT, Elts));
19657 const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
19658 switch ((X86ISD::NodeType)Opcode) {
19659 case X86ISD::FIRST_NUMBER: break;
19660 case X86ISD::BSF: return "X86ISD::BSF";
19661 case X86ISD::BSR: return "X86ISD::BSR";
19662 case X86ISD::SHLD: return "X86ISD::SHLD";
19663 case X86ISD::SHRD: return "X86ISD::SHRD";
19664 case X86ISD::FAND: return "X86ISD::FAND";
19665 case X86ISD::FANDN: return "X86ISD::FANDN";
19666 case X86ISD::FOR: return "X86ISD::FOR";
19667 case X86ISD::FXOR: return "X86ISD::FXOR";
19668 case X86ISD::FILD: return "X86ISD::FILD";
19669 case X86ISD::FILD_FLAG: return "X86ISD::FILD_FLAG";
19670 case X86ISD::FP_TO_INT16_IN_MEM: return "X86ISD::FP_TO_INT16_IN_MEM";
19671 case X86ISD::FP_TO_INT32_IN_MEM: return "X86ISD::FP_TO_INT32_IN_MEM";
19672 case X86ISD::FP_TO_INT64_IN_MEM: return "X86ISD::FP_TO_INT64_IN_MEM";
19673 case X86ISD::FLD: return "X86ISD::FLD";
19674 case X86ISD::FST: return "X86ISD::FST";
19675 case X86ISD::CALL: return "X86ISD::CALL";
19676 case X86ISD::RDTSC_DAG: return "X86ISD::RDTSC_DAG";
19677 case X86ISD::RDTSCP_DAG: return "X86ISD::RDTSCP_DAG";
19678 case X86ISD::RDPMC_DAG: return "X86ISD::RDPMC_DAG";
19679 case X86ISD::BT: return "X86ISD::BT";
19680 case X86ISD::CMP: return "X86ISD::CMP";
19681 case X86ISD::COMI: return "X86ISD::COMI";
19682 case X86ISD::UCOMI: return "X86ISD::UCOMI";
19683 case X86ISD::CMPM: return "X86ISD::CMPM";
19684 case X86ISD::CMPMU: return "X86ISD::CMPMU";
19685 case X86ISD::CMPM_RND: return "X86ISD::CMPM_RND";
19686 case X86ISD::SETCC: return "X86ISD::SETCC";
19687 case X86ISD::SETCC_CARRY: return "X86ISD::SETCC_CARRY";
19688 case X86ISD::FSETCC: return "X86ISD::FSETCC";
19689 case X86ISD::FGETSIGNx86: return "X86ISD::FGETSIGNx86";
19690 case X86ISD::CMOV: return "X86ISD::CMOV";
19691 case X86ISD::BRCOND: return "X86ISD::BRCOND";
19692 case X86ISD::RET_FLAG: return "X86ISD::RET_FLAG";
19693 case X86ISD::REP_STOS: return "X86ISD::REP_STOS";
19694 case X86ISD::REP_MOVS: return "X86ISD::REP_MOVS";
19695 case X86ISD::GlobalBaseReg: return "X86ISD::GlobalBaseReg";
19696 case X86ISD::Wrapper: return "X86ISD::Wrapper";
19697 case X86ISD::WrapperRIP: return "X86ISD::WrapperRIP";
19698 case X86ISD::MOVDQ2Q: return "X86ISD::MOVDQ2Q";
19699 case X86ISD::MMX_MOVD2W: return "X86ISD::MMX_MOVD2W";
19700 case X86ISD::MMX_MOVW2D: return "X86ISD::MMX_MOVW2D";
19701 case X86ISD::PEXTRB: return "X86ISD::PEXTRB";
19702 case X86ISD::PEXTRW: return "X86ISD::PEXTRW";
19703 case X86ISD::INSERTPS: return "X86ISD::INSERTPS";
19704 case X86ISD::PINSRB: return "X86ISD::PINSRB";
19705 case X86ISD::PINSRW: return "X86ISD::PINSRW";
19706 case X86ISD::MMX_PINSRW: return "X86ISD::MMX_PINSRW";
19707 case X86ISD::PSHUFB: return "X86ISD::PSHUFB";
19708 case X86ISD::ANDNP: return "X86ISD::ANDNP";
19709 case X86ISD::PSIGN: return "X86ISD::PSIGN";
19710 case X86ISD::BLENDI: return "X86ISD::BLENDI";
19711 case X86ISD::SHRUNKBLEND: return "X86ISD::SHRUNKBLEND";
19712 case X86ISD::ADDUS: return "X86ISD::ADDUS";
19713 case X86ISD::SUBUS: return "X86ISD::SUBUS";
19714 case X86ISD::HADD: return "X86ISD::HADD";
19715 case X86ISD::HSUB: return "X86ISD::HSUB";
19716 case X86ISD::FHADD: return "X86ISD::FHADD";
19717 case X86ISD::FHSUB: return "X86ISD::FHSUB";
19718 case X86ISD::ABS: return "X86ISD::ABS";
19719 case X86ISD::CONFLICT: return "X86ISD::CONFLICT";
19720 case X86ISD::FMAX: return "X86ISD::FMAX";
19721 case X86ISD::FMAX_RND: return "X86ISD::FMAX_RND";
19722 case X86ISD::FMIN: return "X86ISD::FMIN";
19723 case X86ISD::FMIN_RND: return "X86ISD::FMIN_RND";
19724 case X86ISD::FMAXC: return "X86ISD::FMAXC";
19725 case X86ISD::FMINC: return "X86ISD::FMINC";
19726 case X86ISD::FRSQRT: return "X86ISD::FRSQRT";
19727 case X86ISD::FRCP: return "X86ISD::FRCP";
19728 case X86ISD::EXTRQI: return "X86ISD::EXTRQI";
19729 case X86ISD::INSERTQI: return "X86ISD::INSERTQI";
19730 case X86ISD::TLSADDR: return "X86ISD::TLSADDR";
19731 case X86ISD::TLSBASEADDR: return "X86ISD::TLSBASEADDR";
19732 case X86ISD::TLSCALL: return "X86ISD::TLSCALL";
19733 case X86ISD::EH_SJLJ_SETJMP: return "X86ISD::EH_SJLJ_SETJMP";
19734 case X86ISD::EH_SJLJ_LONGJMP: return "X86ISD::EH_SJLJ_LONGJMP";
19735 case X86ISD::EH_RETURN: return "X86ISD::EH_RETURN";
19736 case X86ISD::TC_RETURN: return "X86ISD::TC_RETURN";
19737 case X86ISD::FNSTCW16m: return "X86ISD::FNSTCW16m";
19738 case X86ISD::FNSTSW16r: return "X86ISD::FNSTSW16r";
19739 case X86ISD::LCMPXCHG_DAG: return "X86ISD::LCMPXCHG_DAG";
19740 case X86ISD::LCMPXCHG8_DAG: return "X86ISD::LCMPXCHG8_DAG";
19741 case X86ISD::LCMPXCHG16_DAG: return "X86ISD::LCMPXCHG16_DAG";
19742 case X86ISD::VZEXT_MOVL: return "X86ISD::VZEXT_MOVL";
19743 case X86ISD::VZEXT_LOAD: return "X86ISD::VZEXT_LOAD";
19744 case X86ISD::VZEXT: return "X86ISD::VZEXT";
19745 case X86ISD::VSEXT: return "X86ISD::VSEXT";
19746 case X86ISD::VTRUNC: return "X86ISD::VTRUNC";
19747 case X86ISD::VTRUNCS: return "X86ISD::VTRUNCS";
19748 case X86ISD::VTRUNCUS: return "X86ISD::VTRUNCUS";
19749 case X86ISD::VINSERT: return "X86ISD::VINSERT";
19750 case X86ISD::VFPEXT: return "X86ISD::VFPEXT";
19751 case X86ISD::VFPROUND: return "X86ISD::VFPROUND";
19752 case X86ISD::CVTDQ2PD: return "X86ISD::CVTDQ2PD";
19753 case X86ISD::CVTUDQ2PD: return "X86ISD::CVTUDQ2PD";
19754 case X86ISD::VSHLDQ: return "X86ISD::VSHLDQ";
19755 case X86ISD::VSRLDQ: return "X86ISD::VSRLDQ";
19756 case X86ISD::VSHL: return "X86ISD::VSHL";
19757 case X86ISD::VSRL: return "X86ISD::VSRL";
19758 case X86ISD::VSRA: return "X86ISD::VSRA";
19759 case X86ISD::VSHLI: return "X86ISD::VSHLI";
19760 case X86ISD::VSRLI: return "X86ISD::VSRLI";
19761 case X86ISD::VSRAI: return "X86ISD::VSRAI";
19762 case X86ISD::CMPP: return "X86ISD::CMPP";
19763 case X86ISD::PCMPEQ: return "X86ISD::PCMPEQ";
19764 case X86ISD::PCMPGT: return "X86ISD::PCMPGT";
19765 case X86ISD::PCMPEQM: return "X86ISD::PCMPEQM";
19766 case X86ISD::PCMPGTM: return "X86ISD::PCMPGTM";
19767 case X86ISD::ADD: return "X86ISD::ADD";
19768 case X86ISD::SUB: return "X86ISD::SUB";
19769 case X86ISD::ADC: return "X86ISD::ADC";
19770 case X86ISD::SBB: return "X86ISD::SBB";
19771 case X86ISD::SMUL: return "X86ISD::SMUL";
19772 case X86ISD::UMUL: return "X86ISD::UMUL";
19773 case X86ISD::SMUL8: return "X86ISD::SMUL8";
19774 case X86ISD::UMUL8: return "X86ISD::UMUL8";
19775 case X86ISD::SDIVREM8_SEXT_HREG: return "X86ISD::SDIVREM8_SEXT_HREG";
19776 case X86ISD::UDIVREM8_ZEXT_HREG: return "X86ISD::UDIVREM8_ZEXT_HREG";
19777 case X86ISD::INC: return "X86ISD::INC";
19778 case X86ISD::DEC: return "X86ISD::DEC";
19779 case X86ISD::OR: return "X86ISD::OR";
19780 case X86ISD::XOR: return "X86ISD::XOR";
19781 case X86ISD::AND: return "X86ISD::AND";
19782 case X86ISD::BEXTR: return "X86ISD::BEXTR";
19783 case X86ISD::MUL_IMM: return "X86ISD::MUL_IMM";
19784 case X86ISD::PTEST: return "X86ISD::PTEST";
19785 case X86ISD::TESTP: return "X86ISD::TESTP";
19786 case X86ISD::TESTM: return "X86ISD::TESTM";
19787 case X86ISD::TESTNM: return "X86ISD::TESTNM";
19788 case X86ISD::KORTEST: return "X86ISD::KORTEST";
19789 case X86ISD::KTEST: return "X86ISD::KTEST";
19790 case X86ISD::PACKSS: return "X86ISD::PACKSS";
19791 case X86ISD::PACKUS: return "X86ISD::PACKUS";
19792 case X86ISD::PALIGNR: return "X86ISD::PALIGNR";
19793 case X86ISD::VALIGN: return "X86ISD::VALIGN";
19794 case X86ISD::PSHUFD: return "X86ISD::PSHUFD";
19795 case X86ISD::PSHUFHW: return "X86ISD::PSHUFHW";
19796 case X86ISD::PSHUFLW: return "X86ISD::PSHUFLW";
19797 case X86ISD::SHUFP: return "X86ISD::SHUFP";
19798 case X86ISD::SHUF128: return "X86ISD::SHUF128";
19799 case X86ISD::MOVLHPS: return "X86ISD::MOVLHPS";
19800 case X86ISD::MOVLHPD: return "X86ISD::MOVLHPD";
19801 case X86ISD::MOVHLPS: return "X86ISD::MOVHLPS";
19802 case X86ISD::MOVLPS: return "X86ISD::MOVLPS";
19803 case X86ISD::MOVLPD: return "X86ISD::MOVLPD";
19804 case X86ISD::MOVDDUP: return "X86ISD::MOVDDUP";
19805 case X86ISD::MOVSHDUP: return "X86ISD::MOVSHDUP";
19806 case X86ISD::MOVSLDUP: return "X86ISD::MOVSLDUP";
19807 case X86ISD::MOVSD: return "X86ISD::MOVSD";
19808 case X86ISD::MOVSS: return "X86ISD::MOVSS";
19809 case X86ISD::UNPCKL: return "X86ISD::UNPCKL";
19810 case X86ISD::UNPCKH: return "X86ISD::UNPCKH";
19811 case X86ISD::VBROADCAST: return "X86ISD::VBROADCAST";
19812 case X86ISD::SUBV_BROADCAST: return "X86ISD::SUBV_BROADCAST";
19813 case X86ISD::VEXTRACT: return "X86ISD::VEXTRACT";
19814 case X86ISD::VPERMILPV: return "X86ISD::VPERMILPV";
19815 case X86ISD::VPERMILPI: return "X86ISD::VPERMILPI";
19816 case X86ISD::VPERM2X128: return "X86ISD::VPERM2X128";
19817 case X86ISD::VPERMV: return "X86ISD::VPERMV";
19818 case X86ISD::VPERMV3: return "X86ISD::VPERMV3";
19819 case X86ISD::VPERMIV3: return "X86ISD::VPERMIV3";
19820 case X86ISD::VPERMI: return "X86ISD::VPERMI";
19821 case X86ISD::VFIXUPIMM: return "X86ISD::VFIXUPIMM";
19822 case X86ISD::VRANGE: return "X86ISD::VRANGE";
19823 case X86ISD::PMULUDQ: return "X86ISD::PMULUDQ";
19824 case X86ISD::PMULDQ: return "X86ISD::PMULDQ";
19825 case X86ISD::PSADBW: return "X86ISD::PSADBW";
19826 case X86ISD::DBPSADBW: return "X86ISD::DBPSADBW";
19827 case X86ISD::VASTART_SAVE_XMM_REGS: return "X86ISD::VASTART_SAVE_XMM_REGS";
19828 case X86ISD::VAARG_64: return "X86ISD::VAARG_64";
19829 case X86ISD::WIN_ALLOCA: return "X86ISD::WIN_ALLOCA";
19830 case X86ISD::MEMBARRIER: return "X86ISD::MEMBARRIER";
19831 case X86ISD::MFENCE: return "X86ISD::MFENCE";
19832 case X86ISD::SFENCE: return "X86ISD::SFENCE";
19833 case X86ISD::LFENCE: return "X86ISD::LFENCE";
19834 case X86ISD::SEG_ALLOCA: return "X86ISD::SEG_ALLOCA";
19835 case X86ISD::SAHF: return "X86ISD::SAHF";
19836 case X86ISD::RDRAND: return "X86ISD::RDRAND";
19837 case X86ISD::RDSEED: return "X86ISD::RDSEED";
19838 case X86ISD::VPMADDUBSW: return "X86ISD::VPMADDUBSW";
19839 case X86ISD::VPMADDWD: return "X86ISD::VPMADDWD";
19840 case X86ISD::VPSHA: return "X86ISD::VPSHA";
19841 case X86ISD::VPSHL: return "X86ISD::VPSHL";
19842 case X86ISD::FMADD: return "X86ISD::FMADD";
19843 case X86ISD::FMSUB: return "X86ISD::FMSUB";
19844 case X86ISD::FNMADD: return "X86ISD::FNMADD";
19845 case X86ISD::FNMSUB: return "X86ISD::FNMSUB";
19846 case X86ISD::FMADDSUB: return "X86ISD::FMADDSUB";
19847 case X86ISD::FMSUBADD: return "X86ISD::FMSUBADD";
19848 case X86ISD::FMADD_RND: return "X86ISD::FMADD_RND";
19849 case X86ISD::FNMADD_RND: return "X86ISD::FNMADD_RND";
19850 case X86ISD::FMSUB_RND: return "X86ISD::FMSUB_RND";
19851 case X86ISD::FNMSUB_RND: return "X86ISD::FNMSUB_RND";
19852 case X86ISD::FMADDSUB_RND: return "X86ISD::FMADDSUB_RND";
19853 case X86ISD::FMSUBADD_RND: return "X86ISD::FMSUBADD_RND";
19854 case X86ISD::VRNDSCALE: return "X86ISD::VRNDSCALE";
19855 case X86ISD::VREDUCE: return "X86ISD::VREDUCE";
19856 case X86ISD::VGETMANT: return "X86ISD::VGETMANT";
19857 case X86ISD::PCMPESTRI: return "X86ISD::PCMPESTRI";
19858 case X86ISD::PCMPISTRI: return "X86ISD::PCMPISTRI";
19859 case X86ISD::XTEST: return "X86ISD::XTEST";
19860 case X86ISD::COMPRESS: return "X86ISD::COMPRESS";
19861 case X86ISD::EXPAND: return "X86ISD::EXPAND";
19862 case X86ISD::SELECT: return "X86ISD::SELECT";
19863 case X86ISD::ADDSUB: return "X86ISD::ADDSUB";
19864 case X86ISD::RCP28: return "X86ISD::RCP28";
19865 case X86ISD::EXP2: return "X86ISD::EXP2";
19866 case X86ISD::RSQRT28: return "X86ISD::RSQRT28";
19867 case X86ISD::FADD_RND: return "X86ISD::FADD_RND";
19868 case X86ISD::FSUB_RND: return "X86ISD::FSUB_RND";
19869 case X86ISD::FMUL_RND: return "X86ISD::FMUL_RND";
19870 case X86ISD::FDIV_RND: return "X86ISD::FDIV_RND";
19871 case X86ISD::FSQRT_RND: return "X86ISD::FSQRT_RND";
19872 case X86ISD::FGETEXP_RND: return "X86ISD::FGETEXP_RND";
19873 case X86ISD::SCALEF: return "X86ISD::SCALEF";
19874 case X86ISD::ADDS: return "X86ISD::ADDS";
19875 case X86ISD::SUBS: return "X86ISD::SUBS";
19876 case X86ISD::AVG: return "X86ISD::AVG";
19877 case X86ISD::MULHRS: return "X86ISD::MULHRS";
19878 case X86ISD::SINT_TO_FP_RND: return "X86ISD::SINT_TO_FP_RND";
19879 case X86ISD::UINT_TO_FP_RND: return "X86ISD::UINT_TO_FP_RND";
19880 case X86ISD::FP_TO_SINT_RND: return "X86ISD::FP_TO_SINT_RND";
19881 case X86ISD::FP_TO_UINT_RND: return "X86ISD::FP_TO_UINT_RND";
19882 case X86ISD::VFPCLASS: return "X86ISD::VFPCLASS";
19887 // isLegalAddressingMode - Return true if the addressing mode represented
19888 // by AM is legal for this target, for a load/store of the specified type.
19889 bool X86TargetLowering::isLegalAddressingMode(const DataLayout &DL,
19890 const AddrMode &AM, Type *Ty,
19891 unsigned AS) const {
19892 // X86 supports extremely general addressing modes.
19893 CodeModel::Model M = getTargetMachine().getCodeModel();
19894 Reloc::Model R = getTargetMachine().getRelocationModel();
19896 // X86 allows a sign-extended 32-bit immediate field as a displacement.
19897 if (!X86::isOffsetSuitableForCodeModel(AM.BaseOffs, M, AM.BaseGV != nullptr))
19902 Subtarget->ClassifyGlobalReference(AM.BaseGV, getTargetMachine());
19904 // If a reference to this global requires an extra load, we can't fold it.
19905 if (isGlobalStubReference(GVFlags))
19908 // If BaseGV requires a register for the PIC base, we cannot also have a
19909 // BaseReg specified.
19910 if (AM.HasBaseReg && isGlobalRelativeToPICBase(GVFlags))
19913 // If lower 4G is not available, then we must use rip-relative addressing.
19914 if ((M != CodeModel::Small || R != Reloc::Static) &&
19915 Subtarget->is64Bit() && (AM.BaseOffs || AM.Scale > 1))
19919 switch (AM.Scale) {
19925 // These scales always work.
19930 // These scales are formed with basereg+scalereg. Only accept if there is
19935 default: // Other stuff never works.
19942 bool X86TargetLowering::isVectorShiftByScalarCheap(Type *Ty) const {
19943 unsigned Bits = Ty->getScalarSizeInBits();
19945 // 8-bit shifts are always expensive, but versions with a scalar amount aren't
19946 // particularly cheaper than those without.
19950 // On AVX2 there are new vpsllv[dq] instructions (and other shifts), that make
19951 // variable shifts just as cheap as scalar ones.
19952 if (Subtarget->hasInt256() && (Bits == 32 || Bits == 64))
19955 // Otherwise, it's significantly cheaper to shift by a scalar amount than by a
19956 // fully general vector.
19960 bool X86TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
19961 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
19963 unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
19964 unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
19965 return NumBits1 > NumBits2;
19968 bool X86TargetLowering::allowTruncateForTailCall(Type *Ty1, Type *Ty2) const {
19969 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
19972 if (!isTypeLegal(EVT::getEVT(Ty1)))
19975 assert(Ty1->getPrimitiveSizeInBits() <= 64 && "i128 is probably not a noop");
19977 // Assuming the caller doesn't have a zeroext or signext return parameter,
19978 // truncation all the way down to i1 is valid.
19982 bool X86TargetLowering::isLegalICmpImmediate(int64_t Imm) const {
19983 return isInt<32>(Imm);
19986 bool X86TargetLowering::isLegalAddImmediate(int64_t Imm) const {
19987 // Can also use sub to handle negated immediates.
19988 return isInt<32>(Imm);
19991 bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
19992 if (!VT1.isInteger() || !VT2.isInteger())
19994 unsigned NumBits1 = VT1.getSizeInBits();
19995 unsigned NumBits2 = VT2.getSizeInBits();
19996 return NumBits1 > NumBits2;
19999 bool X86TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
20000 // x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
20001 return Ty1->isIntegerTy(32) && Ty2->isIntegerTy(64) && Subtarget->is64Bit();
20004 bool X86TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
20005 // x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
20006 return VT1 == MVT::i32 && VT2 == MVT::i64 && Subtarget->is64Bit();
20009 bool X86TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
20010 EVT VT1 = Val.getValueType();
20011 if (isZExtFree(VT1, VT2))
20014 if (Val.getOpcode() != ISD::LOAD)
20017 if (!VT1.isSimple() || !VT1.isInteger() ||
20018 !VT2.isSimple() || !VT2.isInteger())
20021 switch (VT1.getSimpleVT().SimpleTy) {
20026 // X86 has 8, 16, and 32-bit zero-extending loads.
20033 bool X86TargetLowering::isVectorLoadExtDesirable(SDValue) const { return true; }
20036 X86TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
20037 if (!(Subtarget->hasFMA() || Subtarget->hasFMA4() || Subtarget->hasAVX512()))
20040 VT = VT.getScalarType();
20042 if (!VT.isSimple())
20045 switch (VT.getSimpleVT().SimpleTy) {
20056 bool X86TargetLowering::isNarrowingProfitable(EVT VT1, EVT VT2) const {
20057 // i16 instructions are longer (0x66 prefix) and potentially slower.
20058 return !(VT1 == MVT::i32 && VT2 == MVT::i16);
20061 /// isShuffleMaskLegal - Targets can use this to indicate that they only
20062 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
20063 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
20064 /// are assumed to be legal.
20066 X86TargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
20068 if (!VT.isSimple())
20071 // Not for i1 vectors
20072 if (VT.getScalarType() == MVT::i1)
20075 // Very little shuffling can be done for 64-bit vectors right now.
20076 if (VT.getSizeInBits() == 64)
20079 // We only care that the types being shuffled are legal. The lowering can
20080 // handle any possible shuffle mask that results.
20081 return isTypeLegal(VT.getSimpleVT());
20085 X86TargetLowering::isVectorClearMaskLegal(const SmallVectorImpl<int> &Mask,
20087 // Just delegate to the generic legality, clear masks aren't special.
20088 return isShuffleMaskLegal(Mask, VT);
20091 //===----------------------------------------------------------------------===//
20092 // X86 Scheduler Hooks
20093 //===----------------------------------------------------------------------===//
20095 /// Utility function to emit xbegin specifying the start of an RTM region.
20096 static MachineBasicBlock *EmitXBegin(MachineInstr *MI, MachineBasicBlock *MBB,
20097 const TargetInstrInfo *TII) {
20098 DebugLoc DL = MI->getDebugLoc();
20100 const BasicBlock *BB = MBB->getBasicBlock();
20101 MachineFunction::iterator I = MBB;
20104 // For the v = xbegin(), we generate
20115 MachineBasicBlock *thisMBB = MBB;
20116 MachineFunction *MF = MBB->getParent();
20117 MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
20118 MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
20119 MF->insert(I, mainMBB);
20120 MF->insert(I, sinkMBB);
20122 // Transfer the remainder of BB and its successor edges to sinkMBB.
20123 sinkMBB->splice(sinkMBB->begin(), MBB,
20124 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
20125 sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
20129 // # fallthrough to mainMBB
20130 // # abortion to sinkMBB
20131 BuildMI(thisMBB, DL, TII->get(X86::XBEGIN_4)).addMBB(sinkMBB);
20132 thisMBB->addSuccessor(mainMBB);
20133 thisMBB->addSuccessor(sinkMBB);
20137 BuildMI(mainMBB, DL, TII->get(X86::MOV32ri), X86::EAX).addImm(-1);
20138 mainMBB->addSuccessor(sinkMBB);
20141 // EAX is live into the sinkMBB
20142 sinkMBB->addLiveIn(X86::EAX);
20143 BuildMI(*sinkMBB, sinkMBB->begin(), DL,
20144 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20147 MI->eraseFromParent();
20151 // FIXME: When we get size specific XMM0 registers, i.e. XMM0_V16I8
20152 // or XMM0_V32I8 in AVX all of this code can be replaced with that
20153 // in the .td file.
20154 static MachineBasicBlock *EmitPCMPSTRM(MachineInstr *MI, MachineBasicBlock *BB,
20155 const TargetInstrInfo *TII) {
20157 switch (MI->getOpcode()) {
20158 default: llvm_unreachable("illegal opcode!");
20159 case X86::PCMPISTRM128REG: Opc = X86::PCMPISTRM128rr; break;
20160 case X86::VPCMPISTRM128REG: Opc = X86::VPCMPISTRM128rr; break;
20161 case X86::PCMPISTRM128MEM: Opc = X86::PCMPISTRM128rm; break;
20162 case X86::VPCMPISTRM128MEM: Opc = X86::VPCMPISTRM128rm; break;
20163 case X86::PCMPESTRM128REG: Opc = X86::PCMPESTRM128rr; break;
20164 case X86::VPCMPESTRM128REG: Opc = X86::VPCMPESTRM128rr; break;
20165 case X86::PCMPESTRM128MEM: Opc = X86::PCMPESTRM128rm; break;
20166 case X86::VPCMPESTRM128MEM: Opc = X86::VPCMPESTRM128rm; break;
20169 DebugLoc dl = MI->getDebugLoc();
20170 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(Opc));
20172 unsigned NumArgs = MI->getNumOperands();
20173 for (unsigned i = 1; i < NumArgs; ++i) {
20174 MachineOperand &Op = MI->getOperand(i);
20175 if (!(Op.isReg() && Op.isImplicit()))
20176 MIB.addOperand(Op);
20178 if (MI->hasOneMemOperand())
20179 MIB->setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
20181 BuildMI(*BB, MI, dl,
20182 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20183 .addReg(X86::XMM0);
20185 MI->eraseFromParent();
20189 // FIXME: Custom handling because TableGen doesn't support multiple implicit
20190 // defs in an instruction pattern
20191 static MachineBasicBlock *EmitPCMPSTRI(MachineInstr *MI, MachineBasicBlock *BB,
20192 const TargetInstrInfo *TII) {
20194 switch (MI->getOpcode()) {
20195 default: llvm_unreachable("illegal opcode!");
20196 case X86::PCMPISTRIREG: Opc = X86::PCMPISTRIrr; break;
20197 case X86::VPCMPISTRIREG: Opc = X86::VPCMPISTRIrr; break;
20198 case X86::PCMPISTRIMEM: Opc = X86::PCMPISTRIrm; break;
20199 case X86::VPCMPISTRIMEM: Opc = X86::VPCMPISTRIrm; break;
20200 case X86::PCMPESTRIREG: Opc = X86::PCMPESTRIrr; break;
20201 case X86::VPCMPESTRIREG: Opc = X86::VPCMPESTRIrr; break;
20202 case X86::PCMPESTRIMEM: Opc = X86::PCMPESTRIrm; break;
20203 case X86::VPCMPESTRIMEM: Opc = X86::VPCMPESTRIrm; break;
20206 DebugLoc dl = MI->getDebugLoc();
20207 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(Opc));
20209 unsigned NumArgs = MI->getNumOperands(); // remove the results
20210 for (unsigned i = 1; i < NumArgs; ++i) {
20211 MachineOperand &Op = MI->getOperand(i);
20212 if (!(Op.isReg() && Op.isImplicit()))
20213 MIB.addOperand(Op);
20215 if (MI->hasOneMemOperand())
20216 MIB->setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
20218 BuildMI(*BB, MI, dl,
20219 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20222 MI->eraseFromParent();
20226 static MachineBasicBlock *EmitMonitor(MachineInstr *MI, MachineBasicBlock *BB,
20227 const X86Subtarget *Subtarget) {
20228 DebugLoc dl = MI->getDebugLoc();
20229 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20230 // Address into RAX/EAX, other two args into ECX, EDX.
20231 unsigned MemOpc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
20232 unsigned MemReg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
20233 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(MemOpc), MemReg);
20234 for (int i = 0; i < X86::AddrNumOperands; ++i)
20235 MIB.addOperand(MI->getOperand(i));
20237 unsigned ValOps = X86::AddrNumOperands;
20238 BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::ECX)
20239 .addReg(MI->getOperand(ValOps).getReg());
20240 BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::EDX)
20241 .addReg(MI->getOperand(ValOps+1).getReg());
20243 // The instruction doesn't actually take any operands though.
20244 BuildMI(*BB, MI, dl, TII->get(X86::MONITORrrr));
20246 MI->eraseFromParent(); // The pseudo is gone now.
20250 MachineBasicBlock *
20251 X86TargetLowering::EmitVAARG64WithCustomInserter(MachineInstr *MI,
20252 MachineBasicBlock *MBB) const {
20253 // Emit va_arg instruction on X86-64.
20255 // Operands to this pseudo-instruction:
20256 // 0 ) Output : destination address (reg)
20257 // 1-5) Input : va_list address (addr, i64mem)
20258 // 6 ) ArgSize : Size (in bytes) of vararg type
20259 // 7 ) ArgMode : 0=overflow only, 1=use gp_offset, 2=use fp_offset
20260 // 8 ) Align : Alignment of type
20261 // 9 ) EFLAGS (implicit-def)
20263 assert(MI->getNumOperands() == 10 && "VAARG_64 should have 10 operands!");
20264 static_assert(X86::AddrNumOperands == 5,
20265 "VAARG_64 assumes 5 address operands");
20267 unsigned DestReg = MI->getOperand(0).getReg();
20268 MachineOperand &Base = MI->getOperand(1);
20269 MachineOperand &Scale = MI->getOperand(2);
20270 MachineOperand &Index = MI->getOperand(3);
20271 MachineOperand &Disp = MI->getOperand(4);
20272 MachineOperand &Segment = MI->getOperand(5);
20273 unsigned ArgSize = MI->getOperand(6).getImm();
20274 unsigned ArgMode = MI->getOperand(7).getImm();
20275 unsigned Align = MI->getOperand(8).getImm();
20277 // Memory Reference
20278 assert(MI->hasOneMemOperand() && "Expected VAARG_64 to have one memoperand");
20279 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
20280 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
20282 // Machine Information
20283 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20284 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
20285 const TargetRegisterClass *AddrRegClass = getRegClassFor(MVT::i64);
20286 const TargetRegisterClass *OffsetRegClass = getRegClassFor(MVT::i32);
20287 DebugLoc DL = MI->getDebugLoc();
20289 // struct va_list {
20292 // i64 overflow_area (address)
20293 // i64 reg_save_area (address)
20295 // sizeof(va_list) = 24
20296 // alignment(va_list) = 8
20298 unsigned TotalNumIntRegs = 6;
20299 unsigned TotalNumXMMRegs = 8;
20300 bool UseGPOffset = (ArgMode == 1);
20301 bool UseFPOffset = (ArgMode == 2);
20302 unsigned MaxOffset = TotalNumIntRegs * 8 +
20303 (UseFPOffset ? TotalNumXMMRegs * 16 : 0);
20305 /* Align ArgSize to a multiple of 8 */
20306 unsigned ArgSizeA8 = (ArgSize + 7) & ~7;
20307 bool NeedsAlign = (Align > 8);
20309 MachineBasicBlock *thisMBB = MBB;
20310 MachineBasicBlock *overflowMBB;
20311 MachineBasicBlock *offsetMBB;
20312 MachineBasicBlock *endMBB;
20314 unsigned OffsetDestReg = 0; // Argument address computed by offsetMBB
20315 unsigned OverflowDestReg = 0; // Argument address computed by overflowMBB
20316 unsigned OffsetReg = 0;
20318 if (!UseGPOffset && !UseFPOffset) {
20319 // If we only pull from the overflow region, we don't create a branch.
20320 // We don't need to alter control flow.
20321 OffsetDestReg = 0; // unused
20322 OverflowDestReg = DestReg;
20324 offsetMBB = nullptr;
20325 overflowMBB = thisMBB;
20328 // First emit code to check if gp_offset (or fp_offset) is below the bound.
20329 // If so, pull the argument from reg_save_area. (branch to offsetMBB)
20330 // If not, pull from overflow_area. (branch to overflowMBB)
20335 // offsetMBB overflowMBB
20340 // Registers for the PHI in endMBB
20341 OffsetDestReg = MRI.createVirtualRegister(AddrRegClass);
20342 OverflowDestReg = MRI.createVirtualRegister(AddrRegClass);
20344 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
20345 MachineFunction *MF = MBB->getParent();
20346 overflowMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20347 offsetMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20348 endMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20350 MachineFunction::iterator MBBIter = MBB;
20353 // Insert the new basic blocks
20354 MF->insert(MBBIter, offsetMBB);
20355 MF->insert(MBBIter, overflowMBB);
20356 MF->insert(MBBIter, endMBB);
20358 // Transfer the remainder of MBB and its successor edges to endMBB.
20359 endMBB->splice(endMBB->begin(), thisMBB,
20360 std::next(MachineBasicBlock::iterator(MI)), thisMBB->end());
20361 endMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
20363 // Make offsetMBB and overflowMBB successors of thisMBB
20364 thisMBB->addSuccessor(offsetMBB);
20365 thisMBB->addSuccessor(overflowMBB);
20367 // endMBB is a successor of both offsetMBB and overflowMBB
20368 offsetMBB->addSuccessor(endMBB);
20369 overflowMBB->addSuccessor(endMBB);
20371 // Load the offset value into a register
20372 OffsetReg = MRI.createVirtualRegister(OffsetRegClass);
20373 BuildMI(thisMBB, DL, TII->get(X86::MOV32rm), OffsetReg)
20377 .addDisp(Disp, UseFPOffset ? 4 : 0)
20378 .addOperand(Segment)
20379 .setMemRefs(MMOBegin, MMOEnd);
20381 // Check if there is enough room left to pull this argument.
20382 BuildMI(thisMBB, DL, TII->get(X86::CMP32ri))
20384 .addImm(MaxOffset + 8 - ArgSizeA8);
20386 // Branch to "overflowMBB" if offset >= max
20387 // Fall through to "offsetMBB" otherwise
20388 BuildMI(thisMBB, DL, TII->get(X86::GetCondBranchFromCond(X86::COND_AE)))
20389 .addMBB(overflowMBB);
20392 // In offsetMBB, emit code to use the reg_save_area.
20394 assert(OffsetReg != 0);
20396 // Read the reg_save_area address.
20397 unsigned RegSaveReg = MRI.createVirtualRegister(AddrRegClass);
20398 BuildMI(offsetMBB, DL, TII->get(X86::MOV64rm), RegSaveReg)
20403 .addOperand(Segment)
20404 .setMemRefs(MMOBegin, MMOEnd);
20406 // Zero-extend the offset
20407 unsigned OffsetReg64 = MRI.createVirtualRegister(AddrRegClass);
20408 BuildMI(offsetMBB, DL, TII->get(X86::SUBREG_TO_REG), OffsetReg64)
20411 .addImm(X86::sub_32bit);
20413 // Add the offset to the reg_save_area to get the final address.
20414 BuildMI(offsetMBB, DL, TII->get(X86::ADD64rr), OffsetDestReg)
20415 .addReg(OffsetReg64)
20416 .addReg(RegSaveReg);
20418 // Compute the offset for the next argument
20419 unsigned NextOffsetReg = MRI.createVirtualRegister(OffsetRegClass);
20420 BuildMI(offsetMBB, DL, TII->get(X86::ADD32ri), NextOffsetReg)
20422 .addImm(UseFPOffset ? 16 : 8);
20424 // Store it back into the va_list.
20425 BuildMI(offsetMBB, DL, TII->get(X86::MOV32mr))
20429 .addDisp(Disp, UseFPOffset ? 4 : 0)
20430 .addOperand(Segment)
20431 .addReg(NextOffsetReg)
20432 .setMemRefs(MMOBegin, MMOEnd);
20435 BuildMI(offsetMBB, DL, TII->get(X86::JMP_1))
20440 // Emit code to use overflow area
20443 // Load the overflow_area address into a register.
20444 unsigned OverflowAddrReg = MRI.createVirtualRegister(AddrRegClass);
20445 BuildMI(overflowMBB, DL, TII->get(X86::MOV64rm), OverflowAddrReg)
20450 .addOperand(Segment)
20451 .setMemRefs(MMOBegin, MMOEnd);
20453 // If we need to align it, do so. Otherwise, just copy the address
20454 // to OverflowDestReg.
20456 // Align the overflow address
20457 assert((Align & (Align-1)) == 0 && "Alignment must be a power of 2");
20458 unsigned TmpReg = MRI.createVirtualRegister(AddrRegClass);
20460 // aligned_addr = (addr + (align-1)) & ~(align-1)
20461 BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), TmpReg)
20462 .addReg(OverflowAddrReg)
20465 BuildMI(overflowMBB, DL, TII->get(X86::AND64ri32), OverflowDestReg)
20467 .addImm(~(uint64_t)(Align-1));
20469 BuildMI(overflowMBB, DL, TII->get(TargetOpcode::COPY), OverflowDestReg)
20470 .addReg(OverflowAddrReg);
20473 // Compute the next overflow address after this argument.
20474 // (the overflow address should be kept 8-byte aligned)
20475 unsigned NextAddrReg = MRI.createVirtualRegister(AddrRegClass);
20476 BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), NextAddrReg)
20477 .addReg(OverflowDestReg)
20478 .addImm(ArgSizeA8);
20480 // Store the new overflow address.
20481 BuildMI(overflowMBB, DL, TII->get(X86::MOV64mr))
20486 .addOperand(Segment)
20487 .addReg(NextAddrReg)
20488 .setMemRefs(MMOBegin, MMOEnd);
20490 // If we branched, emit the PHI to the front of endMBB.
20492 BuildMI(*endMBB, endMBB->begin(), DL,
20493 TII->get(X86::PHI), DestReg)
20494 .addReg(OffsetDestReg).addMBB(offsetMBB)
20495 .addReg(OverflowDestReg).addMBB(overflowMBB);
20498 // Erase the pseudo instruction
20499 MI->eraseFromParent();
20504 MachineBasicBlock *
20505 X86TargetLowering::EmitVAStartSaveXMMRegsWithCustomInserter(
20507 MachineBasicBlock *MBB) const {
20508 // Emit code to save XMM registers to the stack. The ABI says that the
20509 // number of registers to save is given in %al, so it's theoretically
20510 // possible to do an indirect jump trick to avoid saving all of them,
20511 // however this code takes a simpler approach and just executes all
20512 // of the stores if %al is non-zero. It's less code, and it's probably
20513 // easier on the hardware branch predictor, and stores aren't all that
20514 // expensive anyway.
20516 // Create the new basic blocks. One block contains all the XMM stores,
20517 // and one block is the final destination regardless of whether any
20518 // stores were performed.
20519 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
20520 MachineFunction *F = MBB->getParent();
20521 MachineFunction::iterator MBBIter = MBB;
20523 MachineBasicBlock *XMMSaveMBB = F->CreateMachineBasicBlock(LLVM_BB);
20524 MachineBasicBlock *EndMBB = F->CreateMachineBasicBlock(LLVM_BB);
20525 F->insert(MBBIter, XMMSaveMBB);
20526 F->insert(MBBIter, EndMBB);
20528 // Transfer the remainder of MBB and its successor edges to EndMBB.
20529 EndMBB->splice(EndMBB->begin(), MBB,
20530 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
20531 EndMBB->transferSuccessorsAndUpdatePHIs(MBB);
20533 // The original block will now fall through to the XMM save block.
20534 MBB->addSuccessor(XMMSaveMBB);
20535 // The XMMSaveMBB will fall through to the end block.
20536 XMMSaveMBB->addSuccessor(EndMBB);
20538 // Now add the instructions.
20539 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20540 DebugLoc DL = MI->getDebugLoc();
20542 unsigned CountReg = MI->getOperand(0).getReg();
20543 int64_t RegSaveFrameIndex = MI->getOperand(1).getImm();
20544 int64_t VarArgsFPOffset = MI->getOperand(2).getImm();
20546 if (!Subtarget->isCallingConvWin64(F->getFunction()->getCallingConv())) {
20547 // If %al is 0, branch around the XMM save block.
20548 BuildMI(MBB, DL, TII->get(X86::TEST8rr)).addReg(CountReg).addReg(CountReg);
20549 BuildMI(MBB, DL, TII->get(X86::JE_1)).addMBB(EndMBB);
20550 MBB->addSuccessor(EndMBB);
20553 // Make sure the last operand is EFLAGS, which gets clobbered by the branch
20554 // that was just emitted, but clearly shouldn't be "saved".
20555 assert((MI->getNumOperands() <= 3 ||
20556 !MI->getOperand(MI->getNumOperands() - 1).isReg() ||
20557 MI->getOperand(MI->getNumOperands() - 1).getReg() == X86::EFLAGS)
20558 && "Expected last argument to be EFLAGS");
20559 unsigned MOVOpc = Subtarget->hasFp256() ? X86::VMOVAPSmr : X86::MOVAPSmr;
20560 // In the XMM save block, save all the XMM argument registers.
20561 for (int i = 3, e = MI->getNumOperands() - 1; i != e; ++i) {
20562 int64_t Offset = (i - 3) * 16 + VarArgsFPOffset;
20563 MachineMemOperand *MMO = F->getMachineMemOperand(
20564 MachinePointerInfo::getFixedStack(*F, RegSaveFrameIndex, Offset),
20565 MachineMemOperand::MOStore,
20566 /*Size=*/16, /*Align=*/16);
20567 BuildMI(XMMSaveMBB, DL, TII->get(MOVOpc))
20568 .addFrameIndex(RegSaveFrameIndex)
20569 .addImm(/*Scale=*/1)
20570 .addReg(/*IndexReg=*/0)
20571 .addImm(/*Disp=*/Offset)
20572 .addReg(/*Segment=*/0)
20573 .addReg(MI->getOperand(i).getReg())
20574 .addMemOperand(MMO);
20577 MI->eraseFromParent(); // The pseudo instruction is gone now.
20582 // The EFLAGS operand of SelectItr might be missing a kill marker
20583 // because there were multiple uses of EFLAGS, and ISel didn't know
20584 // which to mark. Figure out whether SelectItr should have had a
20585 // kill marker, and set it if it should. Returns the correct kill
20587 static bool checkAndUpdateEFLAGSKill(MachineBasicBlock::iterator SelectItr,
20588 MachineBasicBlock* BB,
20589 const TargetRegisterInfo* TRI) {
20590 // Scan forward through BB for a use/def of EFLAGS.
20591 MachineBasicBlock::iterator miI(std::next(SelectItr));
20592 for (MachineBasicBlock::iterator miE = BB->end(); miI != miE; ++miI) {
20593 const MachineInstr& mi = *miI;
20594 if (mi.readsRegister(X86::EFLAGS))
20596 if (mi.definesRegister(X86::EFLAGS))
20597 break; // Should have kill-flag - update below.
20600 // If we hit the end of the block, check whether EFLAGS is live into a
20602 if (miI == BB->end()) {
20603 for (MachineBasicBlock::succ_iterator sItr = BB->succ_begin(),
20604 sEnd = BB->succ_end();
20605 sItr != sEnd; ++sItr) {
20606 MachineBasicBlock* succ = *sItr;
20607 if (succ->isLiveIn(X86::EFLAGS))
20612 // We found a def, or hit the end of the basic block and EFLAGS wasn't live
20613 // out. SelectMI should have a kill flag on EFLAGS.
20614 SelectItr->addRegisterKilled(X86::EFLAGS, TRI);
20618 // Return true if it is OK for this CMOV pseudo-opcode to be cascaded
20619 // together with other CMOV pseudo-opcodes into a single basic-block with
20620 // conditional jump around it.
20621 static bool isCMOVPseudo(MachineInstr *MI) {
20622 switch (MI->getOpcode()) {
20623 case X86::CMOV_FR32:
20624 case X86::CMOV_FR64:
20625 case X86::CMOV_GR8:
20626 case X86::CMOV_GR16:
20627 case X86::CMOV_GR32:
20628 case X86::CMOV_RFP32:
20629 case X86::CMOV_RFP64:
20630 case X86::CMOV_RFP80:
20631 case X86::CMOV_V2F64:
20632 case X86::CMOV_V2I64:
20633 case X86::CMOV_V4F32:
20634 case X86::CMOV_V4F64:
20635 case X86::CMOV_V4I64:
20636 case X86::CMOV_V16F32:
20637 case X86::CMOV_V8F32:
20638 case X86::CMOV_V8F64:
20639 case X86::CMOV_V8I64:
20640 case X86::CMOV_V8I1:
20641 case X86::CMOV_V16I1:
20642 case X86::CMOV_V32I1:
20643 case X86::CMOV_V64I1:
20651 MachineBasicBlock *
20652 X86TargetLowering::EmitLoweredSelect(MachineInstr *MI,
20653 MachineBasicBlock *BB) const {
20654 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20655 DebugLoc DL = MI->getDebugLoc();
20657 // To "insert" a SELECT_CC instruction, we actually have to insert the
20658 // diamond control-flow pattern. The incoming instruction knows the
20659 // destination vreg to set, the condition code register to branch on, the
20660 // true/false values to select between, and a branch opcode to use.
20661 const BasicBlock *LLVM_BB = BB->getBasicBlock();
20662 MachineFunction::iterator It = BB;
20668 // cmpTY ccX, r1, r2
20670 // fallthrough --> copy0MBB
20671 MachineBasicBlock *thisMBB = BB;
20672 MachineFunction *F = BB->getParent();
20674 // This code lowers all pseudo-CMOV instructions. Generally it lowers these
20675 // as described above, by inserting a BB, and then making a PHI at the join
20676 // point to select the true and false operands of the CMOV in the PHI.
20678 // The code also handles two different cases of multiple CMOV opcodes
20682 // In this case, there are multiple CMOVs in a row, all which are based on
20683 // the same condition setting (or the exact opposite condition setting).
20684 // In this case we can lower all the CMOVs using a single inserted BB, and
20685 // then make a number of PHIs at the join point to model the CMOVs. The only
20686 // trickiness here, is that in a case like:
20688 // t2 = CMOV cond1 t1, f1
20689 // t3 = CMOV cond1 t2, f2
20691 // when rewriting this into PHIs, we have to perform some renaming on the
20692 // temps since you cannot have a PHI operand refer to a PHI result earlier
20693 // in the same block. The "simple" but wrong lowering would be:
20695 // t2 = PHI t1(BB1), f1(BB2)
20696 // t3 = PHI t2(BB1), f2(BB2)
20698 // but clearly t2 is not defined in BB1, so that is incorrect. The proper
20699 // renaming is to note that on the path through BB1, t2 is really just a
20700 // copy of t1, and do that renaming, properly generating:
20702 // t2 = PHI t1(BB1), f1(BB2)
20703 // t3 = PHI t1(BB1), f2(BB2)
20705 // Case 2, we lower cascaded CMOVs such as
20707 // (CMOV (CMOV F, T, cc1), T, cc2)
20709 // to two successives branches. For that, we look for another CMOV as the
20710 // following instruction.
20712 // Without this, we would add a PHI between the two jumps, which ends up
20713 // creating a few copies all around. For instance, for
20715 // (sitofp (zext (fcmp une)))
20717 // we would generate:
20719 // ucomiss %xmm1, %xmm0
20720 // movss <1.0f>, %xmm0
20721 // movaps %xmm0, %xmm1
20723 // xorps %xmm1, %xmm1
20726 // movaps %xmm1, %xmm0
20730 // because this custom-inserter would have generated:
20742 // A: X = ...; Y = ...
20744 // C: Z = PHI [X, A], [Y, B]
20746 // E: PHI [X, C], [Z, D]
20748 // If we lower both CMOVs in a single step, we can instead generate:
20760 // A: X = ...; Y = ...
20762 // E: PHI [X, A], [X, C], [Y, D]
20764 // Which, in our sitofp/fcmp example, gives us something like:
20766 // ucomiss %xmm1, %xmm0
20767 // movss <1.0f>, %xmm0
20770 // xorps %xmm0, %xmm0
20774 MachineInstr *CascadedCMOV = nullptr;
20775 MachineInstr *LastCMOV = MI;
20776 X86::CondCode CC = X86::CondCode(MI->getOperand(3).getImm());
20777 X86::CondCode OppCC = X86::GetOppositeBranchCondition(CC);
20778 MachineBasicBlock::iterator NextMIIt =
20779 std::next(MachineBasicBlock::iterator(MI));
20781 // Check for case 1, where there are multiple CMOVs with the same condition
20782 // first. Of the two cases of multiple CMOV lowerings, case 1 reduces the
20783 // number of jumps the most.
20785 if (isCMOVPseudo(MI)) {
20786 // See if we have a string of CMOVS with the same condition.
20787 while (NextMIIt != BB->end() &&
20788 isCMOVPseudo(NextMIIt) &&
20789 (NextMIIt->getOperand(3).getImm() == CC ||
20790 NextMIIt->getOperand(3).getImm() == OppCC)) {
20791 LastCMOV = &*NextMIIt;
20796 // This checks for case 2, but only do this if we didn't already find
20797 // case 1, as indicated by LastCMOV == MI.
20798 if (LastCMOV == MI &&
20799 NextMIIt != BB->end() && NextMIIt->getOpcode() == MI->getOpcode() &&
20800 NextMIIt->getOperand(2).getReg() == MI->getOperand(2).getReg() &&
20801 NextMIIt->getOperand(1).getReg() == MI->getOperand(0).getReg()) {
20802 CascadedCMOV = &*NextMIIt;
20805 MachineBasicBlock *jcc1MBB = nullptr;
20807 // If we have a cascaded CMOV, we lower it to two successive branches to
20808 // the same block. EFLAGS is used by both, so mark it as live in the second.
20809 if (CascadedCMOV) {
20810 jcc1MBB = F->CreateMachineBasicBlock(LLVM_BB);
20811 F->insert(It, jcc1MBB);
20812 jcc1MBB->addLiveIn(X86::EFLAGS);
20815 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
20816 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
20817 F->insert(It, copy0MBB);
20818 F->insert(It, sinkMBB);
20820 // If the EFLAGS register isn't dead in the terminator, then claim that it's
20821 // live into the sink and copy blocks.
20822 const TargetRegisterInfo *TRI = Subtarget->getRegisterInfo();
20824 MachineInstr *LastEFLAGSUser = CascadedCMOV ? CascadedCMOV : LastCMOV;
20825 if (!LastEFLAGSUser->killsRegister(X86::EFLAGS) &&
20826 !checkAndUpdateEFLAGSKill(LastEFLAGSUser, BB, TRI)) {
20827 copy0MBB->addLiveIn(X86::EFLAGS);
20828 sinkMBB->addLiveIn(X86::EFLAGS);
20831 // Transfer the remainder of BB and its successor edges to sinkMBB.
20832 sinkMBB->splice(sinkMBB->begin(), BB,
20833 std::next(MachineBasicBlock::iterator(LastCMOV)), BB->end());
20834 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
20836 // Add the true and fallthrough blocks as its successors.
20837 if (CascadedCMOV) {
20838 // The fallthrough block may be jcc1MBB, if we have a cascaded CMOV.
20839 BB->addSuccessor(jcc1MBB);
20841 // In that case, jcc1MBB will itself fallthrough the copy0MBB, and
20842 // jump to the sinkMBB.
20843 jcc1MBB->addSuccessor(copy0MBB);
20844 jcc1MBB->addSuccessor(sinkMBB);
20846 BB->addSuccessor(copy0MBB);
20849 // The true block target of the first (or only) branch is always sinkMBB.
20850 BB->addSuccessor(sinkMBB);
20852 // Create the conditional branch instruction.
20853 unsigned Opc = X86::GetCondBranchFromCond(CC);
20854 BuildMI(BB, DL, TII->get(Opc)).addMBB(sinkMBB);
20856 if (CascadedCMOV) {
20857 unsigned Opc2 = X86::GetCondBranchFromCond(
20858 (X86::CondCode)CascadedCMOV->getOperand(3).getImm());
20859 BuildMI(jcc1MBB, DL, TII->get(Opc2)).addMBB(sinkMBB);
20863 // %FalseValue = ...
20864 // # fallthrough to sinkMBB
20865 copy0MBB->addSuccessor(sinkMBB);
20868 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
20870 MachineBasicBlock::iterator MIItBegin = MachineBasicBlock::iterator(MI);
20871 MachineBasicBlock::iterator MIItEnd =
20872 std::next(MachineBasicBlock::iterator(LastCMOV));
20873 MachineBasicBlock::iterator SinkInsertionPoint = sinkMBB->begin();
20874 DenseMap<unsigned, std::pair<unsigned, unsigned>> RegRewriteTable;
20875 MachineInstrBuilder MIB;
20877 // As we are creating the PHIs, we have to be careful if there is more than
20878 // one. Later CMOVs may reference the results of earlier CMOVs, but later
20879 // PHIs have to reference the individual true/false inputs from earlier PHIs.
20880 // That also means that PHI construction must work forward from earlier to
20881 // later, and that the code must maintain a mapping from earlier PHI's
20882 // destination registers, and the registers that went into the PHI.
20884 for (MachineBasicBlock::iterator MIIt = MIItBegin; MIIt != MIItEnd; ++MIIt) {
20885 unsigned DestReg = MIIt->getOperand(0).getReg();
20886 unsigned Op1Reg = MIIt->getOperand(1).getReg();
20887 unsigned Op2Reg = MIIt->getOperand(2).getReg();
20889 // If this CMOV we are generating is the opposite condition from
20890 // the jump we generated, then we have to swap the operands for the
20891 // PHI that is going to be generated.
20892 if (MIIt->getOperand(3).getImm() == OppCC)
20893 std::swap(Op1Reg, Op2Reg);
20895 if (RegRewriteTable.find(Op1Reg) != RegRewriteTable.end())
20896 Op1Reg = RegRewriteTable[Op1Reg].first;
20898 if (RegRewriteTable.find(Op2Reg) != RegRewriteTable.end())
20899 Op2Reg = RegRewriteTable[Op2Reg].second;
20901 MIB = BuildMI(*sinkMBB, SinkInsertionPoint, DL,
20902 TII->get(X86::PHI), DestReg)
20903 .addReg(Op1Reg).addMBB(copy0MBB)
20904 .addReg(Op2Reg).addMBB(thisMBB);
20906 // Add this PHI to the rewrite table.
20907 RegRewriteTable[DestReg] = std::make_pair(Op1Reg, Op2Reg);
20910 // If we have a cascaded CMOV, the second Jcc provides the same incoming
20911 // value as the first Jcc (the True operand of the SELECT_CC/CMOV nodes).
20912 if (CascadedCMOV) {
20913 MIB.addReg(MI->getOperand(2).getReg()).addMBB(jcc1MBB);
20914 // Copy the PHI result to the register defined by the second CMOV.
20915 BuildMI(*sinkMBB, std::next(MachineBasicBlock::iterator(MIB.getInstr())),
20916 DL, TII->get(TargetOpcode::COPY),
20917 CascadedCMOV->getOperand(0).getReg())
20918 .addReg(MI->getOperand(0).getReg());
20919 CascadedCMOV->eraseFromParent();
20922 // Now remove the CMOV(s).
20923 for (MachineBasicBlock::iterator MIIt = MIItBegin; MIIt != MIItEnd; )
20924 (MIIt++)->eraseFromParent();
20929 MachineBasicBlock *
20930 X86TargetLowering::EmitLoweredAtomicFP(MachineInstr *MI,
20931 MachineBasicBlock *BB) const {
20932 // Combine the following atomic floating-point modification pattern:
20933 // a.store(reg OP a.load(acquire), release)
20934 // Transform them into:
20935 // OPss (%gpr), %xmm
20936 // movss %xmm, (%gpr)
20937 // Or sd equivalent for 64-bit operations.
20939 switch (MI->getOpcode()) {
20940 default: llvm_unreachable("unexpected instr type for EmitLoweredAtomicFP");
20941 case X86::RELEASE_FADD32mr: MOp = X86::MOVSSmr; FOp = X86::ADDSSrm; break;
20942 case X86::RELEASE_FADD64mr: MOp = X86::MOVSDmr; FOp = X86::ADDSDrm; break;
20944 const X86InstrInfo *TII = Subtarget->getInstrInfo();
20945 DebugLoc DL = MI->getDebugLoc();
20946 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
20947 unsigned MSrc = MI->getOperand(0).getReg();
20948 unsigned VSrc = MI->getOperand(5).getReg();
20949 MachineInstrBuilder MIM = BuildMI(*BB, MI, DL, TII->get(MOp))
20950 .addReg(/*Base=*/MSrc)
20951 .addImm(/*Scale=*/1)
20952 .addReg(/*Index=*/0)
20955 MachineInstr *MIO = BuildMI(*BB, (MachineInstr *)MIM, DL, TII->get(FOp),
20956 MRI.createVirtualRegister(MRI.getRegClass(VSrc)))
20958 .addReg(/*Base=*/MSrc)
20959 .addImm(/*Scale=*/1)
20960 .addReg(/*Index=*/0)
20961 .addImm(/*Disp=*/0)
20962 .addReg(/*Segment=*/0);
20963 MIM.addReg(MIO->getOperand(0).getReg(), RegState::Kill);
20964 MI->eraseFromParent(); // The pseudo instruction is gone now.
20968 MachineBasicBlock *
20969 X86TargetLowering::EmitLoweredSegAlloca(MachineInstr *MI,
20970 MachineBasicBlock *BB) const {
20971 MachineFunction *MF = BB->getParent();
20972 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20973 DebugLoc DL = MI->getDebugLoc();
20974 const BasicBlock *LLVM_BB = BB->getBasicBlock();
20976 assert(MF->shouldSplitStack());
20978 const bool Is64Bit = Subtarget->is64Bit();
20979 const bool IsLP64 = Subtarget->isTarget64BitLP64();
20981 const unsigned TlsReg = Is64Bit ? X86::FS : X86::GS;
20982 const unsigned TlsOffset = IsLP64 ? 0x70 : Is64Bit ? 0x40 : 0x30;
20985 // ... [Till the alloca]
20986 // If stacklet is not large enough, jump to mallocMBB
20989 // Allocate by subtracting from RSP
20990 // Jump to continueMBB
20993 // Allocate by call to runtime
20997 // [rest of original BB]
21000 MachineBasicBlock *mallocMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21001 MachineBasicBlock *bumpMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21002 MachineBasicBlock *continueMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21004 MachineRegisterInfo &MRI = MF->getRegInfo();
21005 const TargetRegisterClass *AddrRegClass =
21006 getRegClassFor(getPointerTy(MF->getDataLayout()));
21008 unsigned mallocPtrVReg = MRI.createVirtualRegister(AddrRegClass),
21009 bumpSPPtrVReg = MRI.createVirtualRegister(AddrRegClass),
21010 tmpSPVReg = MRI.createVirtualRegister(AddrRegClass),
21011 SPLimitVReg = MRI.createVirtualRegister(AddrRegClass),
21012 sizeVReg = MI->getOperand(1).getReg(),
21013 physSPReg = IsLP64 || Subtarget->isTargetNaCl64() ? X86::RSP : X86::ESP;
21015 MachineFunction::iterator MBBIter = BB;
21018 MF->insert(MBBIter, bumpMBB);
21019 MF->insert(MBBIter, mallocMBB);
21020 MF->insert(MBBIter, continueMBB);
21022 continueMBB->splice(continueMBB->begin(), BB,
21023 std::next(MachineBasicBlock::iterator(MI)), BB->end());
21024 continueMBB->transferSuccessorsAndUpdatePHIs(BB);
21026 // Add code to the main basic block to check if the stack limit has been hit,
21027 // and if so, jump to mallocMBB otherwise to bumpMBB.
21028 BuildMI(BB, DL, TII->get(TargetOpcode::COPY), tmpSPVReg).addReg(physSPReg);
21029 BuildMI(BB, DL, TII->get(IsLP64 ? X86::SUB64rr:X86::SUB32rr), SPLimitVReg)
21030 .addReg(tmpSPVReg).addReg(sizeVReg);
21031 BuildMI(BB, DL, TII->get(IsLP64 ? X86::CMP64mr:X86::CMP32mr))
21032 .addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg)
21033 .addReg(SPLimitVReg);
21034 BuildMI(BB, DL, TII->get(X86::JG_1)).addMBB(mallocMBB);
21036 // bumpMBB simply decreases the stack pointer, since we know the current
21037 // stacklet has enough space.
21038 BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), physSPReg)
21039 .addReg(SPLimitVReg);
21040 BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), bumpSPPtrVReg)
21041 .addReg(SPLimitVReg);
21042 BuildMI(bumpMBB, DL, TII->get(X86::JMP_1)).addMBB(continueMBB);
21044 // Calls into a routine in libgcc to allocate more space from the heap.
21045 const uint32_t *RegMask =
21046 Subtarget->getRegisterInfo()->getCallPreservedMask(*MF, CallingConv::C);
21048 BuildMI(mallocMBB, DL, TII->get(X86::MOV64rr), X86::RDI)
21050 BuildMI(mallocMBB, DL, TII->get(X86::CALL64pcrel32))
21051 .addExternalSymbol("__morestack_allocate_stack_space")
21052 .addRegMask(RegMask)
21053 .addReg(X86::RDI, RegState::Implicit)
21054 .addReg(X86::RAX, RegState::ImplicitDefine);
21055 } else if (Is64Bit) {
21056 BuildMI(mallocMBB, DL, TII->get(X86::MOV32rr), X86::EDI)
21058 BuildMI(mallocMBB, DL, TII->get(X86::CALL64pcrel32))
21059 .addExternalSymbol("__morestack_allocate_stack_space")
21060 .addRegMask(RegMask)
21061 .addReg(X86::EDI, RegState::Implicit)
21062 .addReg(X86::EAX, RegState::ImplicitDefine);
21064 BuildMI(mallocMBB, DL, TII->get(X86::SUB32ri), physSPReg).addReg(physSPReg)
21066 BuildMI(mallocMBB, DL, TII->get(X86::PUSH32r)).addReg(sizeVReg);
21067 BuildMI(mallocMBB, DL, TII->get(X86::CALLpcrel32))
21068 .addExternalSymbol("__morestack_allocate_stack_space")
21069 .addRegMask(RegMask)
21070 .addReg(X86::EAX, RegState::ImplicitDefine);
21074 BuildMI(mallocMBB, DL, TII->get(X86::ADD32ri), physSPReg).addReg(physSPReg)
21077 BuildMI(mallocMBB, DL, TII->get(TargetOpcode::COPY), mallocPtrVReg)
21078 .addReg(IsLP64 ? X86::RAX : X86::EAX);
21079 BuildMI(mallocMBB, DL, TII->get(X86::JMP_1)).addMBB(continueMBB);
21081 // Set up the CFG correctly.
21082 BB->addSuccessor(bumpMBB);
21083 BB->addSuccessor(mallocMBB);
21084 mallocMBB->addSuccessor(continueMBB);
21085 bumpMBB->addSuccessor(continueMBB);
21087 // Take care of the PHI nodes.
21088 BuildMI(*continueMBB, continueMBB->begin(), DL, TII->get(X86::PHI),
21089 MI->getOperand(0).getReg())
21090 .addReg(mallocPtrVReg).addMBB(mallocMBB)
21091 .addReg(bumpSPPtrVReg).addMBB(bumpMBB);
21093 // Delete the original pseudo instruction.
21094 MI->eraseFromParent();
21097 return continueMBB;
21100 MachineBasicBlock *
21101 X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
21102 MachineBasicBlock *BB) const {
21103 DebugLoc DL = MI->getDebugLoc();
21105 assert(!Subtarget->isTargetMachO());
21107 Subtarget->getFrameLowering()->emitStackProbeCall(*BB->getParent(), *BB, MI,
21110 MI->eraseFromParent(); // The pseudo instruction is gone now.
21114 MachineBasicBlock *
21115 X86TargetLowering::EmitLoweredTLSCall(MachineInstr *MI,
21116 MachineBasicBlock *BB) const {
21117 // This is pretty easy. We're taking the value that we received from
21118 // our load from the relocation, sticking it in either RDI (x86-64)
21119 // or EAX and doing an indirect call. The return value will then
21120 // be in the normal return register.
21121 MachineFunction *F = BB->getParent();
21122 const X86InstrInfo *TII = Subtarget->getInstrInfo();
21123 DebugLoc DL = MI->getDebugLoc();
21125 assert(Subtarget->isTargetDarwin() && "Darwin only instr emitted?");
21126 assert(MI->getOperand(3).isGlobal() && "This should be a global");
21128 // Get a register mask for the lowered call.
21129 // FIXME: The 32-bit calls have non-standard calling conventions. Use a
21130 // proper register mask.
21131 const uint32_t *RegMask =
21132 Subtarget->getRegisterInfo()->getCallPreservedMask(*F, CallingConv::C);
21133 if (Subtarget->is64Bit()) {
21134 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21135 TII->get(X86::MOV64rm), X86::RDI)
21137 .addImm(0).addReg(0)
21138 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21139 MI->getOperand(3).getTargetFlags())
21141 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL64m));
21142 addDirectMem(MIB, X86::RDI);
21143 MIB.addReg(X86::RAX, RegState::ImplicitDefine).addRegMask(RegMask);
21144 } else if (F->getTarget().getRelocationModel() != Reloc::PIC_) {
21145 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21146 TII->get(X86::MOV32rm), X86::EAX)
21148 .addImm(0).addReg(0)
21149 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21150 MI->getOperand(3).getTargetFlags())
21152 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
21153 addDirectMem(MIB, X86::EAX);
21154 MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
21156 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21157 TII->get(X86::MOV32rm), X86::EAX)
21158 .addReg(TII->getGlobalBaseReg(F))
21159 .addImm(0).addReg(0)
21160 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21161 MI->getOperand(3).getTargetFlags())
21163 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
21164 addDirectMem(MIB, X86::EAX);
21165 MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
21168 MI->eraseFromParent(); // The pseudo instruction is gone now.
21172 MachineBasicBlock *
21173 X86TargetLowering::emitEHSjLjSetJmp(MachineInstr *MI,
21174 MachineBasicBlock *MBB) const {
21175 DebugLoc DL = MI->getDebugLoc();
21176 MachineFunction *MF = MBB->getParent();
21177 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21178 MachineRegisterInfo &MRI = MF->getRegInfo();
21180 const BasicBlock *BB = MBB->getBasicBlock();
21181 MachineFunction::iterator I = MBB;
21184 // Memory Reference
21185 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
21186 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
21189 unsigned MemOpndSlot = 0;
21191 unsigned CurOp = 0;
21193 DstReg = MI->getOperand(CurOp++).getReg();
21194 const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
21195 assert(RC->hasType(MVT::i32) && "Invalid destination!");
21196 unsigned mainDstReg = MRI.createVirtualRegister(RC);
21197 unsigned restoreDstReg = MRI.createVirtualRegister(RC);
21199 MemOpndSlot = CurOp;
21201 MVT PVT = getPointerTy(MF->getDataLayout());
21202 assert((PVT == MVT::i64 || PVT == MVT::i32) &&
21203 "Invalid Pointer Size!");
21205 // For v = setjmp(buf), we generate
21208 // buf[LabelOffset] = restoreMBB
21209 // SjLjSetup restoreMBB
21215 // v = phi(main, restore)
21218 // if base pointer being used, load it from frame
21221 MachineBasicBlock *thisMBB = MBB;
21222 MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
21223 MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
21224 MachineBasicBlock *restoreMBB = MF->CreateMachineBasicBlock(BB);
21225 MF->insert(I, mainMBB);
21226 MF->insert(I, sinkMBB);
21227 MF->push_back(restoreMBB);
21229 MachineInstrBuilder MIB;
21231 // Transfer the remainder of BB and its successor edges to sinkMBB.
21232 sinkMBB->splice(sinkMBB->begin(), MBB,
21233 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
21234 sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
21237 unsigned PtrStoreOpc = 0;
21238 unsigned LabelReg = 0;
21239 const int64_t LabelOffset = 1 * PVT.getStoreSize();
21240 Reloc::Model RM = MF->getTarget().getRelocationModel();
21241 bool UseImmLabel = (MF->getTarget().getCodeModel() == CodeModel::Small) &&
21242 (RM == Reloc::Static || RM == Reloc::DynamicNoPIC);
21244 // Prepare IP either in reg or imm.
21245 if (!UseImmLabel) {
21246 PtrStoreOpc = (PVT == MVT::i64) ? X86::MOV64mr : X86::MOV32mr;
21247 const TargetRegisterClass *PtrRC = getRegClassFor(PVT);
21248 LabelReg = MRI.createVirtualRegister(PtrRC);
21249 if (Subtarget->is64Bit()) {
21250 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::LEA64r), LabelReg)
21254 .addMBB(restoreMBB)
21257 const X86InstrInfo *XII = static_cast<const X86InstrInfo*>(TII);
21258 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::LEA32r), LabelReg)
21259 .addReg(XII->getGlobalBaseReg(MF))
21262 .addMBB(restoreMBB, Subtarget->ClassifyBlockAddressReference())
21266 PtrStoreOpc = (PVT == MVT::i64) ? X86::MOV64mi32 : X86::MOV32mi;
21268 MIB = BuildMI(*thisMBB, MI, DL, TII->get(PtrStoreOpc));
21269 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21270 if (i == X86::AddrDisp)
21271 MIB.addDisp(MI->getOperand(MemOpndSlot + i), LabelOffset);
21273 MIB.addOperand(MI->getOperand(MemOpndSlot + i));
21276 MIB.addReg(LabelReg);
21278 MIB.addMBB(restoreMBB);
21279 MIB.setMemRefs(MMOBegin, MMOEnd);
21281 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::EH_SjLj_Setup))
21282 .addMBB(restoreMBB);
21284 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
21285 MIB.addRegMask(RegInfo->getNoPreservedMask());
21286 thisMBB->addSuccessor(mainMBB);
21287 thisMBB->addSuccessor(restoreMBB);
21291 BuildMI(mainMBB, DL, TII->get(X86::MOV32r0), mainDstReg);
21292 mainMBB->addSuccessor(sinkMBB);
21295 BuildMI(*sinkMBB, sinkMBB->begin(), DL,
21296 TII->get(X86::PHI), DstReg)
21297 .addReg(mainDstReg).addMBB(mainMBB)
21298 .addReg(restoreDstReg).addMBB(restoreMBB);
21301 if (RegInfo->hasBasePointer(*MF)) {
21302 const bool Uses64BitFramePtr =
21303 Subtarget->isTarget64BitLP64() || Subtarget->isTargetNaCl64();
21304 X86MachineFunctionInfo *X86FI = MF->getInfo<X86MachineFunctionInfo>();
21305 X86FI->setRestoreBasePointer(MF);
21306 unsigned FramePtr = RegInfo->getFrameRegister(*MF);
21307 unsigned BasePtr = RegInfo->getBaseRegister();
21308 unsigned Opm = Uses64BitFramePtr ? X86::MOV64rm : X86::MOV32rm;
21309 addRegOffset(BuildMI(restoreMBB, DL, TII->get(Opm), BasePtr),
21310 FramePtr, true, X86FI->getRestoreBasePointerOffset())
21311 .setMIFlag(MachineInstr::FrameSetup);
21313 BuildMI(restoreMBB, DL, TII->get(X86::MOV32ri), restoreDstReg).addImm(1);
21314 BuildMI(restoreMBB, DL, TII->get(X86::JMP_1)).addMBB(sinkMBB);
21315 restoreMBB->addSuccessor(sinkMBB);
21317 MI->eraseFromParent();
21321 MachineBasicBlock *
21322 X86TargetLowering::emitEHSjLjLongJmp(MachineInstr *MI,
21323 MachineBasicBlock *MBB) const {
21324 DebugLoc DL = MI->getDebugLoc();
21325 MachineFunction *MF = MBB->getParent();
21326 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21327 MachineRegisterInfo &MRI = MF->getRegInfo();
21329 // Memory Reference
21330 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
21331 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
21333 MVT PVT = getPointerTy(MF->getDataLayout());
21334 assert((PVT == MVT::i64 || PVT == MVT::i32) &&
21335 "Invalid Pointer Size!");
21337 const TargetRegisterClass *RC =
21338 (PVT == MVT::i64) ? &X86::GR64RegClass : &X86::GR32RegClass;
21339 unsigned Tmp = MRI.createVirtualRegister(RC);
21340 // Since FP is only updated here but NOT referenced, it's treated as GPR.
21341 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
21342 unsigned FP = (PVT == MVT::i64) ? X86::RBP : X86::EBP;
21343 unsigned SP = RegInfo->getStackRegister();
21345 MachineInstrBuilder MIB;
21347 const int64_t LabelOffset = 1 * PVT.getStoreSize();
21348 const int64_t SPOffset = 2 * PVT.getStoreSize();
21350 unsigned PtrLoadOpc = (PVT == MVT::i64) ? X86::MOV64rm : X86::MOV32rm;
21351 unsigned IJmpOpc = (PVT == MVT::i64) ? X86::JMP64r : X86::JMP32r;
21354 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), FP);
21355 for (unsigned i = 0; i < X86::AddrNumOperands; ++i)
21356 MIB.addOperand(MI->getOperand(i));
21357 MIB.setMemRefs(MMOBegin, MMOEnd);
21359 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), Tmp);
21360 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21361 if (i == X86::AddrDisp)
21362 MIB.addDisp(MI->getOperand(i), LabelOffset);
21364 MIB.addOperand(MI->getOperand(i));
21366 MIB.setMemRefs(MMOBegin, MMOEnd);
21368 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), SP);
21369 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21370 if (i == X86::AddrDisp)
21371 MIB.addDisp(MI->getOperand(i), SPOffset);
21373 MIB.addOperand(MI->getOperand(i));
21375 MIB.setMemRefs(MMOBegin, MMOEnd);
21377 BuildMI(*MBB, MI, DL, TII->get(IJmpOpc)).addReg(Tmp);
21379 MI->eraseFromParent();
21383 // Replace 213-type (isel default) FMA3 instructions with 231-type for
21384 // accumulator loops. Writing back to the accumulator allows the coalescer
21385 // to remove extra copies in the loop.
21386 // FIXME: Do this on AVX512. We don't support 231 variants yet (PR23937).
21387 MachineBasicBlock *
21388 X86TargetLowering::emitFMA3Instr(MachineInstr *MI,
21389 MachineBasicBlock *MBB) const {
21390 MachineOperand &AddendOp = MI->getOperand(3);
21392 // Bail out early if the addend isn't a register - we can't switch these.
21393 if (!AddendOp.isReg())
21396 MachineFunction &MF = *MBB->getParent();
21397 MachineRegisterInfo &MRI = MF.getRegInfo();
21399 // Check whether the addend is defined by a PHI:
21400 assert(MRI.hasOneDef(AddendOp.getReg()) && "Multiple defs in SSA?");
21401 MachineInstr &AddendDef = *MRI.def_instr_begin(AddendOp.getReg());
21402 if (!AddendDef.isPHI())
21405 // Look for the following pattern:
21407 // %addend = phi [%entry, 0], [%loop, %result]
21409 // %result<tied1> = FMA213 %m2<tied0>, %m1, %addend
21413 // %addend = phi [%entry, 0], [%loop, %result]
21415 // %result<tied1> = FMA231 %addend<tied0>, %m1, %m2
21417 for (unsigned i = 1, e = AddendDef.getNumOperands(); i < e; i += 2) {
21418 assert(AddendDef.getOperand(i).isReg());
21419 MachineOperand PHISrcOp = AddendDef.getOperand(i);
21420 MachineInstr &PHISrcInst = *MRI.def_instr_begin(PHISrcOp.getReg());
21421 if (&PHISrcInst == MI) {
21422 // Found a matching instruction.
21423 unsigned NewFMAOpc = 0;
21424 switch (MI->getOpcode()) {
21425 case X86::VFMADDPDr213r: NewFMAOpc = X86::VFMADDPDr231r; break;
21426 case X86::VFMADDPSr213r: NewFMAOpc = X86::VFMADDPSr231r; break;
21427 case X86::VFMADDSDr213r: NewFMAOpc = X86::VFMADDSDr231r; break;
21428 case X86::VFMADDSSr213r: NewFMAOpc = X86::VFMADDSSr231r; break;
21429 case X86::VFMSUBPDr213r: NewFMAOpc = X86::VFMSUBPDr231r; break;
21430 case X86::VFMSUBPSr213r: NewFMAOpc = X86::VFMSUBPSr231r; break;
21431 case X86::VFMSUBSDr213r: NewFMAOpc = X86::VFMSUBSDr231r; break;
21432 case X86::VFMSUBSSr213r: NewFMAOpc = X86::VFMSUBSSr231r; break;
21433 case X86::VFNMADDPDr213r: NewFMAOpc = X86::VFNMADDPDr231r; break;
21434 case X86::VFNMADDPSr213r: NewFMAOpc = X86::VFNMADDPSr231r; break;
21435 case X86::VFNMADDSDr213r: NewFMAOpc = X86::VFNMADDSDr231r; break;
21436 case X86::VFNMADDSSr213r: NewFMAOpc = X86::VFNMADDSSr231r; break;
21437 case X86::VFNMSUBPDr213r: NewFMAOpc = X86::VFNMSUBPDr231r; break;
21438 case X86::VFNMSUBPSr213r: NewFMAOpc = X86::VFNMSUBPSr231r; break;
21439 case X86::VFNMSUBSDr213r: NewFMAOpc = X86::VFNMSUBSDr231r; break;
21440 case X86::VFNMSUBSSr213r: NewFMAOpc = X86::VFNMSUBSSr231r; break;
21441 case X86::VFMADDSUBPDr213r: NewFMAOpc = X86::VFMADDSUBPDr231r; break;
21442 case X86::VFMADDSUBPSr213r: NewFMAOpc = X86::VFMADDSUBPSr231r; break;
21443 case X86::VFMSUBADDPDr213r: NewFMAOpc = X86::VFMSUBADDPDr231r; break;
21444 case X86::VFMSUBADDPSr213r: NewFMAOpc = X86::VFMSUBADDPSr231r; break;
21446 case X86::VFMADDPDr213rY: NewFMAOpc = X86::VFMADDPDr231rY; break;
21447 case X86::VFMADDPSr213rY: NewFMAOpc = X86::VFMADDPSr231rY; break;
21448 case X86::VFMSUBPDr213rY: NewFMAOpc = X86::VFMSUBPDr231rY; break;
21449 case X86::VFMSUBPSr213rY: NewFMAOpc = X86::VFMSUBPSr231rY; break;
21450 case X86::VFNMADDPDr213rY: NewFMAOpc = X86::VFNMADDPDr231rY; break;
21451 case X86::VFNMADDPSr213rY: NewFMAOpc = X86::VFNMADDPSr231rY; break;
21452 case X86::VFNMSUBPDr213rY: NewFMAOpc = X86::VFNMSUBPDr231rY; break;
21453 case X86::VFNMSUBPSr213rY: NewFMAOpc = X86::VFNMSUBPSr231rY; break;
21454 case X86::VFMADDSUBPDr213rY: NewFMAOpc = X86::VFMADDSUBPDr231rY; break;
21455 case X86::VFMADDSUBPSr213rY: NewFMAOpc = X86::VFMADDSUBPSr231rY; break;
21456 case X86::VFMSUBADDPDr213rY: NewFMAOpc = X86::VFMSUBADDPDr231rY; break;
21457 case X86::VFMSUBADDPSr213rY: NewFMAOpc = X86::VFMSUBADDPSr231rY; break;
21458 default: llvm_unreachable("Unrecognized FMA variant.");
21461 const TargetInstrInfo &TII = *Subtarget->getInstrInfo();
21462 MachineInstrBuilder MIB =
21463 BuildMI(MF, MI->getDebugLoc(), TII.get(NewFMAOpc))
21464 .addOperand(MI->getOperand(0))
21465 .addOperand(MI->getOperand(3))
21466 .addOperand(MI->getOperand(2))
21467 .addOperand(MI->getOperand(1));
21468 MBB->insert(MachineBasicBlock::iterator(MI), MIB);
21469 MI->eraseFromParent();
21476 MachineBasicBlock *
21477 X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
21478 MachineBasicBlock *BB) const {
21479 switch (MI->getOpcode()) {
21480 default: llvm_unreachable("Unexpected instr type to insert");
21481 case X86::TAILJMPd64:
21482 case X86::TAILJMPr64:
21483 case X86::TAILJMPm64:
21484 case X86::TAILJMPd64_REX:
21485 case X86::TAILJMPr64_REX:
21486 case X86::TAILJMPm64_REX:
21487 llvm_unreachable("TAILJMP64 would not be touched here.");
21488 case X86::TCRETURNdi64:
21489 case X86::TCRETURNri64:
21490 case X86::TCRETURNmi64:
21492 case X86::WIN_ALLOCA:
21493 return EmitLoweredWinAlloca(MI, BB);
21494 case X86::SEG_ALLOCA_32:
21495 case X86::SEG_ALLOCA_64:
21496 return EmitLoweredSegAlloca(MI, BB);
21497 case X86::TLSCall_32:
21498 case X86::TLSCall_64:
21499 return EmitLoweredTLSCall(MI, BB);
21500 case X86::CMOV_FR32:
21501 case X86::CMOV_FR64:
21502 case X86::CMOV_GR8:
21503 case X86::CMOV_GR16:
21504 case X86::CMOV_GR32:
21505 case X86::CMOV_RFP32:
21506 case X86::CMOV_RFP64:
21507 case X86::CMOV_RFP80:
21508 case X86::CMOV_V2F64:
21509 case X86::CMOV_V2I64:
21510 case X86::CMOV_V4F32:
21511 case X86::CMOV_V4F64:
21512 case X86::CMOV_V4I64:
21513 case X86::CMOV_V16F32:
21514 case X86::CMOV_V8F32:
21515 case X86::CMOV_V8F64:
21516 case X86::CMOV_V8I64:
21517 case X86::CMOV_V8I1:
21518 case X86::CMOV_V16I1:
21519 case X86::CMOV_V32I1:
21520 case X86::CMOV_V64I1:
21521 return EmitLoweredSelect(MI, BB);
21523 case X86::RELEASE_FADD32mr:
21524 case X86::RELEASE_FADD64mr:
21525 return EmitLoweredAtomicFP(MI, BB);
21527 case X86::FP32_TO_INT16_IN_MEM:
21528 case X86::FP32_TO_INT32_IN_MEM:
21529 case X86::FP32_TO_INT64_IN_MEM:
21530 case X86::FP64_TO_INT16_IN_MEM:
21531 case X86::FP64_TO_INT32_IN_MEM:
21532 case X86::FP64_TO_INT64_IN_MEM:
21533 case X86::FP80_TO_INT16_IN_MEM:
21534 case X86::FP80_TO_INT32_IN_MEM:
21535 case X86::FP80_TO_INT64_IN_MEM: {
21536 MachineFunction *F = BB->getParent();
21537 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21538 DebugLoc DL = MI->getDebugLoc();
21540 // Change the floating point control register to use "round towards zero"
21541 // mode when truncating to an integer value.
21542 int CWFrameIdx = F->getFrameInfo()->CreateStackObject(2, 2, false);
21543 addFrameReference(BuildMI(*BB, MI, DL,
21544 TII->get(X86::FNSTCW16m)), CWFrameIdx);
21546 // Load the old value of the high byte of the control word...
21548 F->getRegInfo().createVirtualRegister(&X86::GR16RegClass);
21549 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16rm), OldCW),
21552 // Set the high part to be round to zero...
21553 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mi)), CWFrameIdx)
21556 // Reload the modified control word now...
21557 addFrameReference(BuildMI(*BB, MI, DL,
21558 TII->get(X86::FLDCW16m)), CWFrameIdx);
21560 // Restore the memory image of control word to original value
21561 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mr)), CWFrameIdx)
21564 // Get the X86 opcode to use.
21566 switch (MI->getOpcode()) {
21567 default: llvm_unreachable("illegal opcode!");
21568 case X86::FP32_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m32; break;
21569 case X86::FP32_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m32; break;
21570 case X86::FP32_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m32; break;
21571 case X86::FP64_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m64; break;
21572 case X86::FP64_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m64; break;
21573 case X86::FP64_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m64; break;
21574 case X86::FP80_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m80; break;
21575 case X86::FP80_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m80; break;
21576 case X86::FP80_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m80; break;
21580 MachineOperand &Op = MI->getOperand(0);
21582 AM.BaseType = X86AddressMode::RegBase;
21583 AM.Base.Reg = Op.getReg();
21585 AM.BaseType = X86AddressMode::FrameIndexBase;
21586 AM.Base.FrameIndex = Op.getIndex();
21588 Op = MI->getOperand(1);
21590 AM.Scale = Op.getImm();
21591 Op = MI->getOperand(2);
21593 AM.IndexReg = Op.getImm();
21594 Op = MI->getOperand(3);
21595 if (Op.isGlobal()) {
21596 AM.GV = Op.getGlobal();
21598 AM.Disp = Op.getImm();
21600 addFullAddress(BuildMI(*BB, MI, DL, TII->get(Opc)), AM)
21601 .addReg(MI->getOperand(X86::AddrNumOperands).getReg());
21603 // Reload the original control word now.
21604 addFrameReference(BuildMI(*BB, MI, DL,
21605 TII->get(X86::FLDCW16m)), CWFrameIdx);
21607 MI->eraseFromParent(); // The pseudo instruction is gone now.
21610 // String/text processing lowering.
21611 case X86::PCMPISTRM128REG:
21612 case X86::VPCMPISTRM128REG:
21613 case X86::PCMPISTRM128MEM:
21614 case X86::VPCMPISTRM128MEM:
21615 case X86::PCMPESTRM128REG:
21616 case X86::VPCMPESTRM128REG:
21617 case X86::PCMPESTRM128MEM:
21618 case X86::VPCMPESTRM128MEM:
21619 assert(Subtarget->hasSSE42() &&
21620 "Target must have SSE4.2 or AVX features enabled");
21621 return EmitPCMPSTRM(MI, BB, Subtarget->getInstrInfo());
21623 // String/text processing lowering.
21624 case X86::PCMPISTRIREG:
21625 case X86::VPCMPISTRIREG:
21626 case X86::PCMPISTRIMEM:
21627 case X86::VPCMPISTRIMEM:
21628 case X86::PCMPESTRIREG:
21629 case X86::VPCMPESTRIREG:
21630 case X86::PCMPESTRIMEM:
21631 case X86::VPCMPESTRIMEM:
21632 assert(Subtarget->hasSSE42() &&
21633 "Target must have SSE4.2 or AVX features enabled");
21634 return EmitPCMPSTRI(MI, BB, Subtarget->getInstrInfo());
21636 // Thread synchronization.
21638 return EmitMonitor(MI, BB, Subtarget);
21642 return EmitXBegin(MI, BB, Subtarget->getInstrInfo());
21644 case X86::VASTART_SAVE_XMM_REGS:
21645 return EmitVAStartSaveXMMRegsWithCustomInserter(MI, BB);
21647 case X86::VAARG_64:
21648 return EmitVAARG64WithCustomInserter(MI, BB);
21650 case X86::EH_SjLj_SetJmp32:
21651 case X86::EH_SjLj_SetJmp64:
21652 return emitEHSjLjSetJmp(MI, BB);
21654 case X86::EH_SjLj_LongJmp32:
21655 case X86::EH_SjLj_LongJmp64:
21656 return emitEHSjLjLongJmp(MI, BB);
21658 case TargetOpcode::STATEPOINT:
21659 // As an implementation detail, STATEPOINT shares the STACKMAP format at
21660 // this point in the process. We diverge later.
21661 return emitPatchPoint(MI, BB);
21663 case TargetOpcode::STACKMAP:
21664 case TargetOpcode::PATCHPOINT:
21665 return emitPatchPoint(MI, BB);
21667 case X86::VFMADDPDr213r:
21668 case X86::VFMADDPSr213r:
21669 case X86::VFMADDSDr213r:
21670 case X86::VFMADDSSr213r:
21671 case X86::VFMSUBPDr213r:
21672 case X86::VFMSUBPSr213r:
21673 case X86::VFMSUBSDr213r:
21674 case X86::VFMSUBSSr213r:
21675 case X86::VFNMADDPDr213r:
21676 case X86::VFNMADDPSr213r:
21677 case X86::VFNMADDSDr213r:
21678 case X86::VFNMADDSSr213r:
21679 case X86::VFNMSUBPDr213r:
21680 case X86::VFNMSUBPSr213r:
21681 case X86::VFNMSUBSDr213r:
21682 case X86::VFNMSUBSSr213r:
21683 case X86::VFMADDSUBPDr213r:
21684 case X86::VFMADDSUBPSr213r:
21685 case X86::VFMSUBADDPDr213r:
21686 case X86::VFMSUBADDPSr213r:
21687 case X86::VFMADDPDr213rY:
21688 case X86::VFMADDPSr213rY:
21689 case X86::VFMSUBPDr213rY:
21690 case X86::VFMSUBPSr213rY:
21691 case X86::VFNMADDPDr213rY:
21692 case X86::VFNMADDPSr213rY:
21693 case X86::VFNMSUBPDr213rY:
21694 case X86::VFNMSUBPSr213rY:
21695 case X86::VFMADDSUBPDr213rY:
21696 case X86::VFMADDSUBPSr213rY:
21697 case X86::VFMSUBADDPDr213rY:
21698 case X86::VFMSUBADDPSr213rY:
21699 return emitFMA3Instr(MI, BB);
21703 //===----------------------------------------------------------------------===//
21704 // X86 Optimization Hooks
21705 //===----------------------------------------------------------------------===//
21707 void X86TargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
21710 const SelectionDAG &DAG,
21711 unsigned Depth) const {
21712 unsigned BitWidth = KnownZero.getBitWidth();
21713 unsigned Opc = Op.getOpcode();
21714 assert((Opc >= ISD::BUILTIN_OP_END ||
21715 Opc == ISD::INTRINSIC_WO_CHAIN ||
21716 Opc == ISD::INTRINSIC_W_CHAIN ||
21717 Opc == ISD::INTRINSIC_VOID) &&
21718 "Should use MaskedValueIsZero if you don't know whether Op"
21719 " is a target node!");
21721 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
21735 // These nodes' second result is a boolean.
21736 if (Op.getResNo() == 0)
21739 case X86ISD::SETCC:
21740 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
21742 case ISD::INTRINSIC_WO_CHAIN: {
21743 unsigned IntId = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
21744 unsigned NumLoBits = 0;
21747 case Intrinsic::x86_sse_movmsk_ps:
21748 case Intrinsic::x86_avx_movmsk_ps_256:
21749 case Intrinsic::x86_sse2_movmsk_pd:
21750 case Intrinsic::x86_avx_movmsk_pd_256:
21751 case Intrinsic::x86_mmx_pmovmskb:
21752 case Intrinsic::x86_sse2_pmovmskb_128:
21753 case Intrinsic::x86_avx2_pmovmskb: {
21754 // High bits of movmskp{s|d}, pmovmskb are known zero.
21756 default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
21757 case Intrinsic::x86_sse_movmsk_ps: NumLoBits = 4; break;
21758 case Intrinsic::x86_avx_movmsk_ps_256: NumLoBits = 8; break;
21759 case Intrinsic::x86_sse2_movmsk_pd: NumLoBits = 2; break;
21760 case Intrinsic::x86_avx_movmsk_pd_256: NumLoBits = 4; break;
21761 case Intrinsic::x86_mmx_pmovmskb: NumLoBits = 8; break;
21762 case Intrinsic::x86_sse2_pmovmskb_128: NumLoBits = 16; break;
21763 case Intrinsic::x86_avx2_pmovmskb: NumLoBits = 32; break;
21765 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - NumLoBits);
21774 unsigned X86TargetLowering::ComputeNumSignBitsForTargetNode(
21776 const SelectionDAG &,
21777 unsigned Depth) const {
21778 // SETCC_CARRY sets the dest to ~0 for true or 0 for false.
21779 if (Op.getOpcode() == X86ISD::SETCC_CARRY)
21780 return Op.getValueType().getScalarType().getSizeInBits();
21786 /// isGAPlusOffset - Returns true (and the GlobalValue and the offset) if the
21787 /// node is a GlobalAddress + offset.
21788 bool X86TargetLowering::isGAPlusOffset(SDNode *N,
21789 const GlobalValue* &GA,
21790 int64_t &Offset) const {
21791 if (N->getOpcode() == X86ISD::Wrapper) {
21792 if (isa<GlobalAddressSDNode>(N->getOperand(0))) {
21793 GA = cast<GlobalAddressSDNode>(N->getOperand(0))->getGlobal();
21794 Offset = cast<GlobalAddressSDNode>(N->getOperand(0))->getOffset();
21798 return TargetLowering::isGAPlusOffset(N, GA, Offset);
21801 /// isShuffleHigh128VectorInsertLow - Checks whether the shuffle node is the
21802 /// same as extracting the high 128-bit part of 256-bit vector and then
21803 /// inserting the result into the low part of a new 256-bit vector
21804 static bool isShuffleHigh128VectorInsertLow(ShuffleVectorSDNode *SVOp) {
21805 EVT VT = SVOp->getValueType(0);
21806 unsigned NumElems = VT.getVectorNumElements();
21808 // vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
21809 for (unsigned i = 0, j = NumElems/2; i != NumElems/2; ++i, ++j)
21810 if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
21811 SVOp->getMaskElt(j) >= 0)
21817 /// isShuffleLow128VectorInsertHigh - Checks whether the shuffle node is the
21818 /// same as extracting the low 128-bit part of 256-bit vector and then
21819 /// inserting the result into the high part of a new 256-bit vector
21820 static bool isShuffleLow128VectorInsertHigh(ShuffleVectorSDNode *SVOp) {
21821 EVT VT = SVOp->getValueType(0);
21822 unsigned NumElems = VT.getVectorNumElements();
21824 // vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
21825 for (unsigned i = NumElems/2, j = 0; i != NumElems; ++i, ++j)
21826 if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
21827 SVOp->getMaskElt(j) >= 0)
21833 /// PerformShuffleCombine256 - Performs shuffle combines for 256-bit vectors.
21834 static SDValue PerformShuffleCombine256(SDNode *N, SelectionDAG &DAG,
21835 TargetLowering::DAGCombinerInfo &DCI,
21836 const X86Subtarget* Subtarget) {
21838 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
21839 SDValue V1 = SVOp->getOperand(0);
21840 SDValue V2 = SVOp->getOperand(1);
21841 EVT VT = SVOp->getValueType(0);
21842 unsigned NumElems = VT.getVectorNumElements();
21844 if (V1.getOpcode() == ISD::CONCAT_VECTORS &&
21845 V2.getOpcode() == ISD::CONCAT_VECTORS) {
21849 // V UNDEF BUILD_VECTOR UNDEF
21851 // CONCAT_VECTOR CONCAT_VECTOR
21854 // RESULT: V + zero extended
21856 if (V2.getOperand(0).getOpcode() != ISD::BUILD_VECTOR ||
21857 V2.getOperand(1).getOpcode() != ISD::UNDEF ||
21858 V1.getOperand(1).getOpcode() != ISD::UNDEF)
21861 if (!ISD::isBuildVectorAllZeros(V2.getOperand(0).getNode()))
21864 // To match the shuffle mask, the first half of the mask should
21865 // be exactly the first vector, and all the rest a splat with the
21866 // first element of the second one.
21867 for (unsigned i = 0; i != NumElems/2; ++i)
21868 if (!isUndefOrEqual(SVOp->getMaskElt(i), i) ||
21869 !isUndefOrEqual(SVOp->getMaskElt(i+NumElems/2), NumElems))
21872 // If V1 is coming from a vector load then just fold to a VZEXT_LOAD.
21873 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(V1.getOperand(0))) {
21874 if (Ld->hasNUsesOfValue(1, 0)) {
21875 SDVTList Tys = DAG.getVTList(MVT::v4i64, MVT::Other);
21876 SDValue Ops[] = { Ld->getChain(), Ld->getBasePtr() };
21878 DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, dl, Tys, Ops,
21880 Ld->getPointerInfo(),
21881 Ld->getAlignment(),
21882 false/*isVolatile*/, true/*ReadMem*/,
21883 false/*WriteMem*/);
21885 // Make sure the newly-created LOAD is in the same position as Ld in
21886 // terms of dependency. We create a TokenFactor for Ld and ResNode,
21887 // and update uses of Ld's output chain to use the TokenFactor.
21888 if (Ld->hasAnyUseOfValue(1)) {
21889 SDValue NewChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
21890 SDValue(Ld, 1), SDValue(ResNode.getNode(), 1));
21891 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), NewChain);
21892 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(Ld, 1),
21893 SDValue(ResNode.getNode(), 1));
21896 return DAG.getBitcast(VT, ResNode);
21900 // Emit a zeroed vector and insert the desired subvector on its
21902 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
21903 SDValue InsV = Insert128BitVector(Zeros, V1.getOperand(0), 0, DAG, dl);
21904 return DCI.CombineTo(N, InsV);
21907 //===--------------------------------------------------------------------===//
21908 // Combine some shuffles into subvector extracts and inserts:
21911 // vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
21912 if (isShuffleHigh128VectorInsertLow(SVOp)) {
21913 SDValue V = Extract128BitVector(V1, NumElems/2, DAG, dl);
21914 SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, 0, DAG, dl);
21915 return DCI.CombineTo(N, InsV);
21918 // vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
21919 if (isShuffleLow128VectorInsertHigh(SVOp)) {
21920 SDValue V = Extract128BitVector(V1, 0, DAG, dl);
21921 SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, NumElems/2, DAG, dl);
21922 return DCI.CombineTo(N, InsV);
21928 /// \brief Combine an arbitrary chain of shuffles into a single instruction if
21931 /// This is the leaf of the recursive combinine below. When we have found some
21932 /// chain of single-use x86 shuffle instructions and accumulated the combined
21933 /// shuffle mask represented by them, this will try to pattern match that mask
21934 /// into either a single instruction if there is a special purpose instruction
21935 /// for this operation, or into a PSHUFB instruction which is a fully general
21936 /// instruction but should only be used to replace chains over a certain depth.
21937 static bool combineX86ShuffleChain(SDValue Op, SDValue Root, ArrayRef<int> Mask,
21938 int Depth, bool HasPSHUFB, SelectionDAG &DAG,
21939 TargetLowering::DAGCombinerInfo &DCI,
21940 const X86Subtarget *Subtarget) {
21941 assert(!Mask.empty() && "Cannot combine an empty shuffle mask!");
21943 // Find the operand that enters the chain. Note that multiple uses are OK
21944 // here, we're not going to remove the operand we find.
21945 SDValue Input = Op.getOperand(0);
21946 while (Input.getOpcode() == ISD::BITCAST)
21947 Input = Input.getOperand(0);
21949 MVT VT = Input.getSimpleValueType();
21950 MVT RootVT = Root.getSimpleValueType();
21953 // Just remove no-op shuffle masks.
21954 if (Mask.size() == 1) {
21955 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Input),
21960 // Use the float domain if the operand type is a floating point type.
21961 bool FloatDomain = VT.isFloatingPoint();
21963 // For floating point shuffles, we don't have free copies in the shuffle
21964 // instructions or the ability to load as part of the instruction, so
21965 // canonicalize their shuffles to UNPCK or MOV variants.
21967 // Note that even with AVX we prefer the PSHUFD form of shuffle for integer
21968 // vectors because it can have a load folded into it that UNPCK cannot. This
21969 // doesn't preclude something switching to the shorter encoding post-RA.
21971 // FIXME: Should teach these routines about AVX vector widths.
21972 if (FloatDomain && VT.getSizeInBits() == 128) {
21973 if (Mask.equals({0, 0}) || Mask.equals({1, 1})) {
21974 bool Lo = Mask.equals({0, 0});
21977 // Check if we have SSE3 which will let us use MOVDDUP. That instruction
21978 // is no slower than UNPCKLPD but has the option to fold the input operand
21979 // into even an unaligned memory load.
21980 if (Lo && Subtarget->hasSSE3()) {
21981 Shuffle = X86ISD::MOVDDUP;
21982 ShuffleVT = MVT::v2f64;
21984 // We have MOVLHPS and MOVHLPS throughout SSE and they encode smaller
21985 // than the UNPCK variants.
21986 Shuffle = Lo ? X86ISD::MOVLHPS : X86ISD::MOVHLPS;
21987 ShuffleVT = MVT::v4f32;
21989 if (Depth == 1 && Root->getOpcode() == Shuffle)
21990 return false; // Nothing to do!
21991 Op = DAG.getBitcast(ShuffleVT, Input);
21992 DCI.AddToWorklist(Op.getNode());
21993 if (Shuffle == X86ISD::MOVDDUP)
21994 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op);
21996 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
21997 DCI.AddToWorklist(Op.getNode());
21998 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22002 if (Subtarget->hasSSE3() &&
22003 (Mask.equals({0, 0, 2, 2}) || Mask.equals({1, 1, 3, 3}))) {
22004 bool Lo = Mask.equals({0, 0, 2, 2});
22005 unsigned Shuffle = Lo ? X86ISD::MOVSLDUP : X86ISD::MOVSHDUP;
22006 MVT ShuffleVT = MVT::v4f32;
22007 if (Depth == 1 && Root->getOpcode() == Shuffle)
22008 return false; // Nothing to do!
22009 Op = DAG.getBitcast(ShuffleVT, Input);
22010 DCI.AddToWorklist(Op.getNode());
22011 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op);
22012 DCI.AddToWorklist(Op.getNode());
22013 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22017 if (Mask.equals({0, 0, 1, 1}) || Mask.equals({2, 2, 3, 3})) {
22018 bool Lo = Mask.equals({0, 0, 1, 1});
22019 unsigned Shuffle = Lo ? X86ISD::UNPCKL : X86ISD::UNPCKH;
22020 MVT ShuffleVT = MVT::v4f32;
22021 if (Depth == 1 && Root->getOpcode() == Shuffle)
22022 return false; // Nothing to do!
22023 Op = DAG.getBitcast(ShuffleVT, Input);
22024 DCI.AddToWorklist(Op.getNode());
22025 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
22026 DCI.AddToWorklist(Op.getNode());
22027 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22033 // We always canonicalize the 8 x i16 and 16 x i8 shuffles into their UNPCK
22034 // variants as none of these have single-instruction variants that are
22035 // superior to the UNPCK formulation.
22036 if (!FloatDomain && VT.getSizeInBits() == 128 &&
22037 (Mask.equals({0, 0, 1, 1, 2, 2, 3, 3}) ||
22038 Mask.equals({4, 4, 5, 5, 6, 6, 7, 7}) ||
22039 Mask.equals({0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7}) ||
22041 {8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15}))) {
22042 bool Lo = Mask[0] == 0;
22043 unsigned Shuffle = Lo ? X86ISD::UNPCKL : X86ISD::UNPCKH;
22044 if (Depth == 1 && Root->getOpcode() == Shuffle)
22045 return false; // Nothing to do!
22047 switch (Mask.size()) {
22049 ShuffleVT = MVT::v8i16;
22052 ShuffleVT = MVT::v16i8;
22055 llvm_unreachable("Impossible mask size!");
22057 Op = DAG.getBitcast(ShuffleVT, Input);
22058 DCI.AddToWorklist(Op.getNode());
22059 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
22060 DCI.AddToWorklist(Op.getNode());
22061 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22066 // Don't try to re-form single instruction chains under any circumstances now
22067 // that we've done encoding canonicalization for them.
22071 // If we have 3 or more shuffle instructions or a chain involving PSHUFB, we
22072 // can replace them with a single PSHUFB instruction profitably. Intel's
22073 // manuals suggest only using PSHUFB if doing so replacing 5 instructions, but
22074 // in practice PSHUFB tends to be *very* fast so we're more aggressive.
22075 if ((Depth >= 3 || HasPSHUFB) && Subtarget->hasSSSE3()) {
22076 SmallVector<SDValue, 16> PSHUFBMask;
22077 int NumBytes = VT.getSizeInBits() / 8;
22078 int Ratio = NumBytes / Mask.size();
22079 for (int i = 0; i < NumBytes; ++i) {
22080 if (Mask[i / Ratio] == SM_SentinelUndef) {
22081 PSHUFBMask.push_back(DAG.getUNDEF(MVT::i8));
22084 int M = Mask[i / Ratio] != SM_SentinelZero
22085 ? Ratio * Mask[i / Ratio] + i % Ratio
22087 PSHUFBMask.push_back(DAG.getConstant(M, DL, MVT::i8));
22089 MVT ByteVT = MVT::getVectorVT(MVT::i8, NumBytes);
22090 Op = DAG.getBitcast(ByteVT, Input);
22091 DCI.AddToWorklist(Op.getNode());
22092 SDValue PSHUFBMaskOp =
22093 DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVT, PSHUFBMask);
22094 DCI.AddToWorklist(PSHUFBMaskOp.getNode());
22095 Op = DAG.getNode(X86ISD::PSHUFB, DL, ByteVT, Op, PSHUFBMaskOp);
22096 DCI.AddToWorklist(Op.getNode());
22097 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22102 // Failed to find any combines.
22106 /// \brief Fully generic combining of x86 shuffle instructions.
22108 /// This should be the last combine run over the x86 shuffle instructions. Once
22109 /// they have been fully optimized, this will recursively consider all chains
22110 /// of single-use shuffle instructions, build a generic model of the cumulative
22111 /// shuffle operation, and check for simpler instructions which implement this
22112 /// operation. We use this primarily for two purposes:
22114 /// 1) Collapse generic shuffles to specialized single instructions when
22115 /// equivalent. In most cases, this is just an encoding size win, but
22116 /// sometimes we will collapse multiple generic shuffles into a single
22117 /// special-purpose shuffle.
22118 /// 2) Look for sequences of shuffle instructions with 3 or more total
22119 /// instructions, and replace them with the slightly more expensive SSSE3
22120 /// PSHUFB instruction if available. We do this as the last combining step
22121 /// to ensure we avoid using PSHUFB if we can implement the shuffle with
22122 /// a suitable short sequence of other instructions. The PHUFB will either
22123 /// use a register or have to read from memory and so is slightly (but only
22124 /// slightly) more expensive than the other shuffle instructions.
22126 /// Because this is inherently a quadratic operation (for each shuffle in
22127 /// a chain, we recurse up the chain), the depth is limited to 8 instructions.
22128 /// This should never be an issue in practice as the shuffle lowering doesn't
22129 /// produce sequences of more than 8 instructions.
22131 /// FIXME: We will currently miss some cases where the redundant shuffling
22132 /// would simplify under the threshold for PSHUFB formation because of
22133 /// combine-ordering. To fix this, we should do the redundant instruction
22134 /// combining in this recursive walk.
22135 static bool combineX86ShufflesRecursively(SDValue Op, SDValue Root,
22136 ArrayRef<int> RootMask,
22137 int Depth, bool HasPSHUFB,
22139 TargetLowering::DAGCombinerInfo &DCI,
22140 const X86Subtarget *Subtarget) {
22141 // Bound the depth of our recursive combine because this is ultimately
22142 // quadratic in nature.
22146 // Directly rip through bitcasts to find the underlying operand.
22147 while (Op.getOpcode() == ISD::BITCAST && Op.getOperand(0).hasOneUse())
22148 Op = Op.getOperand(0);
22150 MVT VT = Op.getSimpleValueType();
22151 if (!VT.isVector())
22152 return false; // Bail if we hit a non-vector.
22154 assert(Root.getSimpleValueType().isVector() &&
22155 "Shuffles operate on vector types!");
22156 assert(VT.getSizeInBits() == Root.getSimpleValueType().getSizeInBits() &&
22157 "Can only combine shuffles of the same vector register size.");
22159 if (!isTargetShuffle(Op.getOpcode()))
22161 SmallVector<int, 16> OpMask;
22163 bool HaveMask = getTargetShuffleMask(Op.getNode(), VT, OpMask, IsUnary);
22164 // We only can combine unary shuffles which we can decode the mask for.
22165 if (!HaveMask || !IsUnary)
22168 assert(VT.getVectorNumElements() == OpMask.size() &&
22169 "Different mask size from vector size!");
22170 assert(((RootMask.size() > OpMask.size() &&
22171 RootMask.size() % OpMask.size() == 0) ||
22172 (OpMask.size() > RootMask.size() &&
22173 OpMask.size() % RootMask.size() == 0) ||
22174 OpMask.size() == RootMask.size()) &&
22175 "The smaller number of elements must divide the larger.");
22176 int RootRatio = std::max<int>(1, OpMask.size() / RootMask.size());
22177 int OpRatio = std::max<int>(1, RootMask.size() / OpMask.size());
22178 assert(((RootRatio == 1 && OpRatio == 1) ||
22179 (RootRatio == 1) != (OpRatio == 1)) &&
22180 "Must not have a ratio for both incoming and op masks!");
22182 SmallVector<int, 16> Mask;
22183 Mask.reserve(std::max(OpMask.size(), RootMask.size()));
22185 // Merge this shuffle operation's mask into our accumulated mask. Note that
22186 // this shuffle's mask will be the first applied to the input, followed by the
22187 // root mask to get us all the way to the root value arrangement. The reason
22188 // for this order is that we are recursing up the operation chain.
22189 for (int i = 0, e = std::max(OpMask.size(), RootMask.size()); i < e; ++i) {
22190 int RootIdx = i / RootRatio;
22191 if (RootMask[RootIdx] < 0) {
22192 // This is a zero or undef lane, we're done.
22193 Mask.push_back(RootMask[RootIdx]);
22197 int RootMaskedIdx = RootMask[RootIdx] * RootRatio + i % RootRatio;
22198 int OpIdx = RootMaskedIdx / OpRatio;
22199 if (OpMask[OpIdx] < 0) {
22200 // The incoming lanes are zero or undef, it doesn't matter which ones we
22202 Mask.push_back(OpMask[OpIdx]);
22206 // Ok, we have non-zero lanes, map them through.
22207 Mask.push_back(OpMask[OpIdx] * OpRatio +
22208 RootMaskedIdx % OpRatio);
22211 // See if we can recurse into the operand to combine more things.
22212 switch (Op.getOpcode()) {
22213 case X86ISD::PSHUFB:
22215 case X86ISD::PSHUFD:
22216 case X86ISD::PSHUFHW:
22217 case X86ISD::PSHUFLW:
22218 if (Op.getOperand(0).hasOneUse() &&
22219 combineX86ShufflesRecursively(Op.getOperand(0), Root, Mask, Depth + 1,
22220 HasPSHUFB, DAG, DCI, Subtarget))
22224 case X86ISD::UNPCKL:
22225 case X86ISD::UNPCKH:
22226 assert(Op.getOperand(0) == Op.getOperand(1) &&
22227 "We only combine unary shuffles!");
22228 // We can't check for single use, we have to check that this shuffle is the
22230 if (Op->isOnlyUserOf(Op.getOperand(0).getNode()) &&
22231 combineX86ShufflesRecursively(Op.getOperand(0), Root, Mask, Depth + 1,
22232 HasPSHUFB, DAG, DCI, Subtarget))
22237 // Minor canonicalization of the accumulated shuffle mask to make it easier
22238 // to match below. All this does is detect masks with squential pairs of
22239 // elements, and shrink them to the half-width mask. It does this in a loop
22240 // so it will reduce the size of the mask to the minimal width mask which
22241 // performs an equivalent shuffle.
22242 SmallVector<int, 16> WidenedMask;
22243 while (Mask.size() > 1 && canWidenShuffleElements(Mask, WidenedMask)) {
22244 Mask = std::move(WidenedMask);
22245 WidenedMask.clear();
22248 return combineX86ShuffleChain(Op, Root, Mask, Depth, HasPSHUFB, DAG, DCI,
22252 /// \brief Get the PSHUF-style mask from PSHUF node.
22254 /// This is a very minor wrapper around getTargetShuffleMask to easy forming v4
22255 /// PSHUF-style masks that can be reused with such instructions.
22256 static SmallVector<int, 4> getPSHUFShuffleMask(SDValue N) {
22257 MVT VT = N.getSimpleValueType();
22258 SmallVector<int, 4> Mask;
22260 bool HaveMask = getTargetShuffleMask(N.getNode(), VT, Mask, IsUnary);
22264 // If we have more than 128-bits, only the low 128-bits of shuffle mask
22265 // matter. Check that the upper masks are repeats and remove them.
22266 if (VT.getSizeInBits() > 128) {
22267 int LaneElts = 128 / VT.getScalarSizeInBits();
22269 for (int i = 1, NumLanes = VT.getSizeInBits() / 128; i < NumLanes; ++i)
22270 for (int j = 0; j < LaneElts; ++j)
22271 assert(Mask[j] == Mask[i * LaneElts + j] - (LaneElts * i) &&
22272 "Mask doesn't repeat in high 128-bit lanes!");
22274 Mask.resize(LaneElts);
22277 switch (N.getOpcode()) {
22278 case X86ISD::PSHUFD:
22280 case X86ISD::PSHUFLW:
22283 case X86ISD::PSHUFHW:
22284 Mask.erase(Mask.begin(), Mask.begin() + 4);
22285 for (int &M : Mask)
22289 llvm_unreachable("No valid shuffle instruction found!");
22293 /// \brief Search for a combinable shuffle across a chain ending in pshufd.
22295 /// We walk up the chain and look for a combinable shuffle, skipping over
22296 /// shuffles that we could hoist this shuffle's transformation past without
22297 /// altering anything.
22299 combineRedundantDWordShuffle(SDValue N, MutableArrayRef<int> Mask,
22301 TargetLowering::DAGCombinerInfo &DCI) {
22302 assert(N.getOpcode() == X86ISD::PSHUFD &&
22303 "Called with something other than an x86 128-bit half shuffle!");
22306 // Walk up a single-use chain looking for a combinable shuffle. Keep a stack
22307 // of the shuffles in the chain so that we can form a fresh chain to replace
22309 SmallVector<SDValue, 8> Chain;
22310 SDValue V = N.getOperand(0);
22311 for (; V.hasOneUse(); V = V.getOperand(0)) {
22312 switch (V.getOpcode()) {
22314 return SDValue(); // Nothing combined!
22317 // Skip bitcasts as we always know the type for the target specific
22321 case X86ISD::PSHUFD:
22322 // Found another dword shuffle.
22325 case X86ISD::PSHUFLW:
22326 // Check that the low words (being shuffled) are the identity in the
22327 // dword shuffle, and the high words are self-contained.
22328 if (Mask[0] != 0 || Mask[1] != 1 ||
22329 !(Mask[2] >= 2 && Mask[2] < 4 && Mask[3] >= 2 && Mask[3] < 4))
22332 Chain.push_back(V);
22335 case X86ISD::PSHUFHW:
22336 // Check that the high words (being shuffled) are the identity in the
22337 // dword shuffle, and the low words are self-contained.
22338 if (Mask[2] != 2 || Mask[3] != 3 ||
22339 !(Mask[0] >= 0 && Mask[0] < 2 && Mask[1] >= 0 && Mask[1] < 2))
22342 Chain.push_back(V);
22345 case X86ISD::UNPCKL:
22346 case X86ISD::UNPCKH:
22347 // For either i8 -> i16 or i16 -> i32 unpacks, we can combine a dword
22348 // shuffle into a preceding word shuffle.
22349 if (V.getSimpleValueType().getScalarType() != MVT::i8 &&
22350 V.getSimpleValueType().getScalarType() != MVT::i16)
22353 // Search for a half-shuffle which we can combine with.
22354 unsigned CombineOp =
22355 V.getOpcode() == X86ISD::UNPCKL ? X86ISD::PSHUFLW : X86ISD::PSHUFHW;
22356 if (V.getOperand(0) != V.getOperand(1) ||
22357 !V->isOnlyUserOf(V.getOperand(0).getNode()))
22359 Chain.push_back(V);
22360 V = V.getOperand(0);
22362 switch (V.getOpcode()) {
22364 return SDValue(); // Nothing to combine.
22366 case X86ISD::PSHUFLW:
22367 case X86ISD::PSHUFHW:
22368 if (V.getOpcode() == CombineOp)
22371 Chain.push_back(V);
22375 V = V.getOperand(0);
22379 } while (V.hasOneUse());
22382 // Break out of the loop if we break out of the switch.
22386 if (!V.hasOneUse())
22387 // We fell out of the loop without finding a viable combining instruction.
22390 // Merge this node's mask and our incoming mask.
22391 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
22392 for (int &M : Mask)
22394 V = DAG.getNode(V.getOpcode(), DL, V.getValueType(), V.getOperand(0),
22395 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
22397 // Rebuild the chain around this new shuffle.
22398 while (!Chain.empty()) {
22399 SDValue W = Chain.pop_back_val();
22401 if (V.getValueType() != W.getOperand(0).getValueType())
22402 V = DAG.getBitcast(W.getOperand(0).getValueType(), V);
22404 switch (W.getOpcode()) {
22406 llvm_unreachable("Only PSHUF and UNPCK instructions get here!");
22408 case X86ISD::UNPCKL:
22409 case X86ISD::UNPCKH:
22410 V = DAG.getNode(W.getOpcode(), DL, W.getValueType(), V, V);
22413 case X86ISD::PSHUFD:
22414 case X86ISD::PSHUFLW:
22415 case X86ISD::PSHUFHW:
22416 V = DAG.getNode(W.getOpcode(), DL, W.getValueType(), V, W.getOperand(1));
22420 if (V.getValueType() != N.getValueType())
22421 V = DAG.getBitcast(N.getValueType(), V);
22423 // Return the new chain to replace N.
22427 /// \brief Search for a combinable shuffle across a chain ending in pshuflw or
22430 /// We walk up the chain, skipping shuffles of the other half and looking
22431 /// through shuffles which switch halves trying to find a shuffle of the same
22432 /// pair of dwords.
22433 static bool combineRedundantHalfShuffle(SDValue N, MutableArrayRef<int> Mask,
22435 TargetLowering::DAGCombinerInfo &DCI) {
22437 (N.getOpcode() == X86ISD::PSHUFLW || N.getOpcode() == X86ISD::PSHUFHW) &&
22438 "Called with something other than an x86 128-bit half shuffle!");
22440 unsigned CombineOpcode = N.getOpcode();
22442 // Walk up a single-use chain looking for a combinable shuffle.
22443 SDValue V = N.getOperand(0);
22444 for (; V.hasOneUse(); V = V.getOperand(0)) {
22445 switch (V.getOpcode()) {
22447 return false; // Nothing combined!
22450 // Skip bitcasts as we always know the type for the target specific
22454 case X86ISD::PSHUFLW:
22455 case X86ISD::PSHUFHW:
22456 if (V.getOpcode() == CombineOpcode)
22459 // Other-half shuffles are no-ops.
22462 // Break out of the loop if we break out of the switch.
22466 if (!V.hasOneUse())
22467 // We fell out of the loop without finding a viable combining instruction.
22470 // Combine away the bottom node as its shuffle will be accumulated into
22471 // a preceding shuffle.
22472 DCI.CombineTo(N.getNode(), N.getOperand(0), /*AddTo*/ true);
22474 // Record the old value.
22477 // Merge this node's mask and our incoming mask (adjusted to account for all
22478 // the pshufd instructions encountered).
22479 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
22480 for (int &M : Mask)
22482 V = DAG.getNode(V.getOpcode(), DL, MVT::v8i16, V.getOperand(0),
22483 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
22485 // Check that the shuffles didn't cancel each other out. If not, we need to
22486 // combine to the new one.
22488 // Replace the combinable shuffle with the combined one, updating all users
22489 // so that we re-evaluate the chain here.
22490 DCI.CombineTo(Old.getNode(), V, /*AddTo*/ true);
22495 /// \brief Try to combine x86 target specific shuffles.
22496 static SDValue PerformTargetShuffleCombine(SDValue N, SelectionDAG &DAG,
22497 TargetLowering::DAGCombinerInfo &DCI,
22498 const X86Subtarget *Subtarget) {
22500 MVT VT = N.getSimpleValueType();
22501 SmallVector<int, 4> Mask;
22503 switch (N.getOpcode()) {
22504 case X86ISD::PSHUFD:
22505 case X86ISD::PSHUFLW:
22506 case X86ISD::PSHUFHW:
22507 Mask = getPSHUFShuffleMask(N);
22508 assert(Mask.size() == 4);
22514 // Nuke no-op shuffles that show up after combining.
22515 if (isNoopShuffleMask(Mask))
22516 return DCI.CombineTo(N.getNode(), N.getOperand(0), /*AddTo*/ true);
22518 // Look for simplifications involving one or two shuffle instructions.
22519 SDValue V = N.getOperand(0);
22520 switch (N.getOpcode()) {
22523 case X86ISD::PSHUFLW:
22524 case X86ISD::PSHUFHW:
22525 assert(VT.getScalarType() == MVT::i16 && "Bad word shuffle type!");
22527 if (combineRedundantHalfShuffle(N, Mask, DAG, DCI))
22528 return SDValue(); // We combined away this shuffle, so we're done.
22530 // See if this reduces to a PSHUFD which is no more expensive and can
22531 // combine with more operations. Note that it has to at least flip the
22532 // dwords as otherwise it would have been removed as a no-op.
22533 if (makeArrayRef(Mask).equals({2, 3, 0, 1})) {
22534 int DMask[] = {0, 1, 2, 3};
22535 int DOffset = N.getOpcode() == X86ISD::PSHUFLW ? 0 : 2;
22536 DMask[DOffset + 0] = DOffset + 1;
22537 DMask[DOffset + 1] = DOffset + 0;
22538 MVT DVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() / 2);
22539 V = DAG.getBitcast(DVT, V);
22540 DCI.AddToWorklist(V.getNode());
22541 V = DAG.getNode(X86ISD::PSHUFD, DL, DVT, V,
22542 getV4X86ShuffleImm8ForMask(DMask, DL, DAG));
22543 DCI.AddToWorklist(V.getNode());
22544 return DAG.getBitcast(VT, V);
22547 // Look for shuffle patterns which can be implemented as a single unpack.
22548 // FIXME: This doesn't handle the location of the PSHUFD generically, and
22549 // only works when we have a PSHUFD followed by two half-shuffles.
22550 if (Mask[0] == Mask[1] && Mask[2] == Mask[3] &&
22551 (V.getOpcode() == X86ISD::PSHUFLW ||
22552 V.getOpcode() == X86ISD::PSHUFHW) &&
22553 V.getOpcode() != N.getOpcode() &&
22555 SDValue D = V.getOperand(0);
22556 while (D.getOpcode() == ISD::BITCAST && D.hasOneUse())
22557 D = D.getOperand(0);
22558 if (D.getOpcode() == X86ISD::PSHUFD && D.hasOneUse()) {
22559 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
22560 SmallVector<int, 4> DMask = getPSHUFShuffleMask(D);
22561 int NOffset = N.getOpcode() == X86ISD::PSHUFLW ? 0 : 4;
22562 int VOffset = V.getOpcode() == X86ISD::PSHUFLW ? 0 : 4;
22564 for (int i = 0; i < 4; ++i) {
22565 WordMask[i + NOffset] = Mask[i] + NOffset;
22566 WordMask[i + VOffset] = VMask[i] + VOffset;
22568 // Map the word mask through the DWord mask.
22570 for (int i = 0; i < 8; ++i)
22571 MappedMask[i] = 2 * DMask[WordMask[i] / 2] + WordMask[i] % 2;
22572 if (makeArrayRef(MappedMask).equals({0, 0, 1, 1, 2, 2, 3, 3}) ||
22573 makeArrayRef(MappedMask).equals({4, 4, 5, 5, 6, 6, 7, 7})) {
22574 // We can replace all three shuffles with an unpack.
22575 V = DAG.getBitcast(VT, D.getOperand(0));
22576 DCI.AddToWorklist(V.getNode());
22577 return DAG.getNode(MappedMask[0] == 0 ? X86ISD::UNPCKL
22586 case X86ISD::PSHUFD:
22587 if (SDValue NewN = combineRedundantDWordShuffle(N, Mask, DAG, DCI))
22596 /// \brief Try to combine a shuffle into a target-specific add-sub node.
22598 /// We combine this directly on the abstract vector shuffle nodes so it is
22599 /// easier to generically match. We also insert dummy vector shuffle nodes for
22600 /// the operands which explicitly discard the lanes which are unused by this
22601 /// operation to try to flow through the rest of the combiner the fact that
22602 /// they're unused.
22603 static SDValue combineShuffleToAddSub(SDNode *N, SelectionDAG &DAG) {
22605 EVT VT = N->getValueType(0);
22607 // We only handle target-independent shuffles.
22608 // FIXME: It would be easy and harmless to use the target shuffle mask
22609 // extraction tool to support more.
22610 if (N->getOpcode() != ISD::VECTOR_SHUFFLE)
22613 auto *SVN = cast<ShuffleVectorSDNode>(N);
22614 ArrayRef<int> Mask = SVN->getMask();
22615 SDValue V1 = N->getOperand(0);
22616 SDValue V2 = N->getOperand(1);
22618 // We require the first shuffle operand to be the SUB node, and the second to
22619 // be the ADD node.
22620 // FIXME: We should support the commuted patterns.
22621 if (V1->getOpcode() != ISD::FSUB || V2->getOpcode() != ISD::FADD)
22624 // If there are other uses of these operations we can't fold them.
22625 if (!V1->hasOneUse() || !V2->hasOneUse())
22628 // Ensure that both operations have the same operands. Note that we can
22629 // commute the FADD operands.
22630 SDValue LHS = V1->getOperand(0), RHS = V1->getOperand(1);
22631 if ((V2->getOperand(0) != LHS || V2->getOperand(1) != RHS) &&
22632 (V2->getOperand(0) != RHS || V2->getOperand(1) != LHS))
22635 // We're looking for blends between FADD and FSUB nodes. We insist on these
22636 // nodes being lined up in a specific expected pattern.
22637 if (!(isShuffleEquivalent(V1, V2, Mask, {0, 3}) ||
22638 isShuffleEquivalent(V1, V2, Mask, {0, 5, 2, 7}) ||
22639 isShuffleEquivalent(V1, V2, Mask, {0, 9, 2, 11, 4, 13, 6, 15})))
22642 // Only specific types are legal at this point, assert so we notice if and
22643 // when these change.
22644 assert((VT == MVT::v4f32 || VT == MVT::v2f64 || VT == MVT::v8f32 ||
22645 VT == MVT::v4f64) &&
22646 "Unknown vector type encountered!");
22648 return DAG.getNode(X86ISD::ADDSUB, DL, VT, LHS, RHS);
22651 /// PerformShuffleCombine - Performs several different shuffle combines.
22652 static SDValue PerformShuffleCombine(SDNode *N, SelectionDAG &DAG,
22653 TargetLowering::DAGCombinerInfo &DCI,
22654 const X86Subtarget *Subtarget) {
22656 SDValue N0 = N->getOperand(0);
22657 SDValue N1 = N->getOperand(1);
22658 EVT VT = N->getValueType(0);
22660 // Don't create instructions with illegal types after legalize types has run.
22661 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
22662 if (!DCI.isBeforeLegalize() && !TLI.isTypeLegal(VT.getVectorElementType()))
22665 // If we have legalized the vector types, look for blends of FADD and FSUB
22666 // nodes that we can fuse into an ADDSUB node.
22667 if (TLI.isTypeLegal(VT) && Subtarget->hasSSE3())
22668 if (SDValue AddSub = combineShuffleToAddSub(N, DAG))
22671 // Combine 256-bit vector shuffles. This is only profitable when in AVX mode
22672 if (Subtarget->hasFp256() && VT.is256BitVector() &&
22673 N->getOpcode() == ISD::VECTOR_SHUFFLE)
22674 return PerformShuffleCombine256(N, DAG, DCI, Subtarget);
22676 // During Type Legalization, when promoting illegal vector types,
22677 // the backend might introduce new shuffle dag nodes and bitcasts.
22679 // This code performs the following transformation:
22680 // fold: (shuffle (bitcast (BINOP A, B)), Undef, <Mask>) ->
22681 // (shuffle (BINOP (bitcast A), (bitcast B)), Undef, <Mask>)
22683 // We do this only if both the bitcast and the BINOP dag nodes have
22684 // one use. Also, perform this transformation only if the new binary
22685 // operation is legal. This is to avoid introducing dag nodes that
22686 // potentially need to be further expanded (or custom lowered) into a
22687 // less optimal sequence of dag nodes.
22688 if (!DCI.isBeforeLegalize() && DCI.isBeforeLegalizeOps() &&
22689 N1.getOpcode() == ISD::UNDEF && N0.hasOneUse() &&
22690 N0.getOpcode() == ISD::BITCAST) {
22691 SDValue BC0 = N0.getOperand(0);
22692 EVT SVT = BC0.getValueType();
22693 unsigned Opcode = BC0.getOpcode();
22694 unsigned NumElts = VT.getVectorNumElements();
22696 if (BC0.hasOneUse() && SVT.isVector() &&
22697 SVT.getVectorNumElements() * 2 == NumElts &&
22698 TLI.isOperationLegal(Opcode, VT)) {
22699 bool CanFold = false;
22711 unsigned SVTNumElts = SVT.getVectorNumElements();
22712 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
22713 for (unsigned i = 0, e = SVTNumElts; i != e && CanFold; ++i)
22714 CanFold = SVOp->getMaskElt(i) == (int)(i * 2);
22715 for (unsigned i = SVTNumElts, e = NumElts; i != e && CanFold; ++i)
22716 CanFold = SVOp->getMaskElt(i) < 0;
22719 SDValue BC00 = DAG.getBitcast(VT, BC0.getOperand(0));
22720 SDValue BC01 = DAG.getBitcast(VT, BC0.getOperand(1));
22721 SDValue NewBinOp = DAG.getNode(BC0.getOpcode(), dl, VT, BC00, BC01);
22722 return DAG.getVectorShuffle(VT, dl, NewBinOp, N1, &SVOp->getMask()[0]);
22727 // Combine a vector_shuffle that is equal to build_vector load1, load2, load3,
22728 // load4, <0, 1, 2, 3> into a 128-bit load if the load addresses are
22729 // consecutive, non-overlapping, and in the right order.
22730 SmallVector<SDValue, 16> Elts;
22731 for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
22732 Elts.push_back(getShuffleScalarElt(N, i, DAG, 0));
22734 if (SDValue LD = EltsFromConsecutiveLoads(VT, Elts, dl, DAG, true))
22737 if (isTargetShuffle(N->getOpcode())) {
22739 PerformTargetShuffleCombine(SDValue(N, 0), DAG, DCI, Subtarget);
22740 if (Shuffle.getNode())
22743 // Try recursively combining arbitrary sequences of x86 shuffle
22744 // instructions into higher-order shuffles. We do this after combining
22745 // specific PSHUF instruction sequences into their minimal form so that we
22746 // can evaluate how many specialized shuffle instructions are involved in
22747 // a particular chain.
22748 SmallVector<int, 1> NonceMask; // Just a placeholder.
22749 NonceMask.push_back(0);
22750 if (combineX86ShufflesRecursively(SDValue(N, 0), SDValue(N, 0), NonceMask,
22751 /*Depth*/ 1, /*HasPSHUFB*/ false, DAG,
22753 return SDValue(); // This routine will use CombineTo to replace N.
22759 /// XFormVExtractWithShuffleIntoLoad - Check if a vector extract from a target
22760 /// specific shuffle of a load can be folded into a single element load.
22761 /// Similar handling for VECTOR_SHUFFLE is performed by DAGCombiner, but
22762 /// shuffles have been custom lowered so we need to handle those here.
22763 static SDValue XFormVExtractWithShuffleIntoLoad(SDNode *N, SelectionDAG &DAG,
22764 TargetLowering::DAGCombinerInfo &DCI) {
22765 if (DCI.isBeforeLegalizeOps())
22768 SDValue InVec = N->getOperand(0);
22769 SDValue EltNo = N->getOperand(1);
22771 if (!isa<ConstantSDNode>(EltNo))
22774 EVT OriginalVT = InVec.getValueType();
22776 if (InVec.getOpcode() == ISD::BITCAST) {
22777 // Don't duplicate a load with other uses.
22778 if (!InVec.hasOneUse())
22780 EVT BCVT = InVec.getOperand(0).getValueType();
22781 if (!BCVT.isVector() ||
22782 BCVT.getVectorNumElements() != OriginalVT.getVectorNumElements())
22784 InVec = InVec.getOperand(0);
22787 EVT CurrentVT = InVec.getValueType();
22789 if (!isTargetShuffle(InVec.getOpcode()))
22792 // Don't duplicate a load with other uses.
22793 if (!InVec.hasOneUse())
22796 SmallVector<int, 16> ShuffleMask;
22798 if (!getTargetShuffleMask(InVec.getNode(), CurrentVT.getSimpleVT(),
22799 ShuffleMask, UnaryShuffle))
22802 // Select the input vector, guarding against out of range extract vector.
22803 unsigned NumElems = CurrentVT.getVectorNumElements();
22804 int Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
22805 int Idx = (Elt > (int)NumElems) ? -1 : ShuffleMask[Elt];
22806 SDValue LdNode = (Idx < (int)NumElems) ? InVec.getOperand(0)
22807 : InVec.getOperand(1);
22809 // If inputs to shuffle are the same for both ops, then allow 2 uses
22810 unsigned AllowedUses = InVec.getNumOperands() > 1 &&
22811 InVec.getOperand(0) == InVec.getOperand(1) ? 2 : 1;
22813 if (LdNode.getOpcode() == ISD::BITCAST) {
22814 // Don't duplicate a load with other uses.
22815 if (!LdNode.getNode()->hasNUsesOfValue(AllowedUses, 0))
22818 AllowedUses = 1; // only allow 1 load use if we have a bitcast
22819 LdNode = LdNode.getOperand(0);
22822 if (!ISD::isNormalLoad(LdNode.getNode()))
22825 LoadSDNode *LN0 = cast<LoadSDNode>(LdNode);
22827 if (!LN0 ||!LN0->hasNUsesOfValue(AllowedUses, 0) || LN0->isVolatile())
22830 EVT EltVT = N->getValueType(0);
22831 // If there's a bitcast before the shuffle, check if the load type and
22832 // alignment is valid.
22833 unsigned Align = LN0->getAlignment();
22834 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
22835 unsigned NewAlign = DAG.getDataLayout().getABITypeAlignment(
22836 EltVT.getTypeForEVT(*DAG.getContext()));
22838 if (NewAlign > Align || !TLI.isOperationLegalOrCustom(ISD::LOAD, EltVT))
22841 // All checks match so transform back to vector_shuffle so that DAG combiner
22842 // can finish the job
22845 // Create shuffle node taking into account the case that its a unary shuffle
22846 SDValue Shuffle = (UnaryShuffle) ? DAG.getUNDEF(CurrentVT)
22847 : InVec.getOperand(1);
22848 Shuffle = DAG.getVectorShuffle(CurrentVT, dl,
22849 InVec.getOperand(0), Shuffle,
22851 Shuffle = DAG.getBitcast(OriginalVT, Shuffle);
22852 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, N->getValueType(0), Shuffle,
22856 /// \brief Detect bitcasts between i32 to x86mmx low word. Since MMX types are
22857 /// special and don't usually play with other vector types, it's better to
22858 /// handle them early to be sure we emit efficient code by avoiding
22859 /// store-load conversions.
22860 static SDValue PerformBITCASTCombine(SDNode *N, SelectionDAG &DAG) {
22861 if (N->getValueType(0) != MVT::x86mmx ||
22862 N->getOperand(0)->getOpcode() != ISD::BUILD_VECTOR ||
22863 N->getOperand(0)->getValueType(0) != MVT::v2i32)
22866 SDValue V = N->getOperand(0);
22867 ConstantSDNode *C = dyn_cast<ConstantSDNode>(V.getOperand(1));
22868 if (C && C->getZExtValue() == 0 && V.getOperand(0).getValueType() == MVT::i32)
22869 return DAG.getNode(X86ISD::MMX_MOVW2D, SDLoc(V.getOperand(0)),
22870 N->getValueType(0), V.getOperand(0));
22875 /// PerformEXTRACT_VECTOR_ELTCombine - Detect vector gather/scatter index
22876 /// generation and convert it from being a bunch of shuffles and extracts
22877 /// into a somewhat faster sequence. For i686, the best sequence is apparently
22878 /// storing the value and loading scalars back, while for x64 we should
22879 /// use 64-bit extracts and shifts.
22880 static SDValue PerformEXTRACT_VECTOR_ELTCombine(SDNode *N, SelectionDAG &DAG,
22881 TargetLowering::DAGCombinerInfo &DCI) {
22882 if (SDValue NewOp = XFormVExtractWithShuffleIntoLoad(N, DAG, DCI))
22885 SDValue InputVector = N->getOperand(0);
22886 SDLoc dl(InputVector);
22887 // Detect mmx to i32 conversion through a v2i32 elt extract.
22888 if (InputVector.getOpcode() == ISD::BITCAST && InputVector.hasOneUse() &&
22889 N->getValueType(0) == MVT::i32 &&
22890 InputVector.getValueType() == MVT::v2i32) {
22892 // The bitcast source is a direct mmx result.
22893 SDValue MMXSrc = InputVector.getNode()->getOperand(0);
22894 if (MMXSrc.getValueType() == MVT::x86mmx)
22895 return DAG.getNode(X86ISD::MMX_MOVD2W, SDLoc(InputVector),
22896 N->getValueType(0),
22897 InputVector.getNode()->getOperand(0));
22899 // The mmx is indirect: (i64 extract_elt (v1i64 bitcast (x86mmx ...))).
22900 SDValue MMXSrcOp = MMXSrc.getOperand(0);
22901 if (MMXSrc.getOpcode() == ISD::EXTRACT_VECTOR_ELT && MMXSrc.hasOneUse() &&
22902 MMXSrc.getValueType() == MVT::i64 && MMXSrcOp.hasOneUse() &&
22903 MMXSrcOp.getOpcode() == ISD::BITCAST &&
22904 MMXSrcOp.getValueType() == MVT::v1i64 &&
22905 MMXSrcOp.getOperand(0).getValueType() == MVT::x86mmx)
22906 return DAG.getNode(X86ISD::MMX_MOVD2W, SDLoc(InputVector),
22907 N->getValueType(0),
22908 MMXSrcOp.getOperand(0));
22911 EVT VT = N->getValueType(0);
22913 if (VT == MVT::i1 && dyn_cast<ConstantSDNode>(N->getOperand(1)) &&
22914 InputVector.getOpcode() == ISD::BITCAST &&
22915 dyn_cast<ConstantSDNode>(InputVector.getOperand(0))) {
22916 uint64_t ExtractedElt =
22917 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
22918 uint64_t InputValue =
22919 cast<ConstantSDNode>(InputVector.getOperand(0))->getZExtValue();
22920 uint64_t Res = (InputValue >> ExtractedElt) & 1;
22921 return DAG.getConstant(Res, dl, MVT::i1);
22923 // Only operate on vectors of 4 elements, where the alternative shuffling
22924 // gets to be more expensive.
22925 if (InputVector.getValueType() != MVT::v4i32)
22928 // Check whether every use of InputVector is an EXTRACT_VECTOR_ELT with a
22929 // single use which is a sign-extend or zero-extend, and all elements are
22931 SmallVector<SDNode *, 4> Uses;
22932 unsigned ExtractedElements = 0;
22933 for (SDNode::use_iterator UI = InputVector.getNode()->use_begin(),
22934 UE = InputVector.getNode()->use_end(); UI != UE; ++UI) {
22935 if (UI.getUse().getResNo() != InputVector.getResNo())
22938 SDNode *Extract = *UI;
22939 if (Extract->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
22942 if (Extract->getValueType(0) != MVT::i32)
22944 if (!Extract->hasOneUse())
22946 if (Extract->use_begin()->getOpcode() != ISD::SIGN_EXTEND &&
22947 Extract->use_begin()->getOpcode() != ISD::ZERO_EXTEND)
22949 if (!isa<ConstantSDNode>(Extract->getOperand(1)))
22952 // Record which element was extracted.
22953 ExtractedElements |=
22954 1 << cast<ConstantSDNode>(Extract->getOperand(1))->getZExtValue();
22956 Uses.push_back(Extract);
22959 // If not all the elements were used, this may not be worthwhile.
22960 if (ExtractedElements != 15)
22963 // Ok, we've now decided to do the transformation.
22964 // If 64-bit shifts are legal, use the extract-shift sequence,
22965 // otherwise bounce the vector off the cache.
22966 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
22969 if (TLI.isOperationLegal(ISD::SRA, MVT::i64)) {
22970 SDValue Cst = DAG.getBitcast(MVT::v2i64, InputVector);
22971 auto &DL = DAG.getDataLayout();
22972 EVT VecIdxTy = DAG.getTargetLoweringInfo().getVectorIdxTy(DL);
22973 SDValue BottomHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Cst,
22974 DAG.getConstant(0, dl, VecIdxTy));
22975 SDValue TopHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Cst,
22976 DAG.getConstant(1, dl, VecIdxTy));
22978 SDValue ShAmt = DAG.getConstant(
22979 32, dl, DAG.getTargetLoweringInfo().getShiftAmountTy(MVT::i64, DL));
22980 Vals[0] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, BottomHalf);
22981 Vals[1] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32,
22982 DAG.getNode(ISD::SRA, dl, MVT::i64, BottomHalf, ShAmt));
22983 Vals[2] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, TopHalf);
22984 Vals[3] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32,
22985 DAG.getNode(ISD::SRA, dl, MVT::i64, TopHalf, ShAmt));
22987 // Store the value to a temporary stack slot.
22988 SDValue StackPtr = DAG.CreateStackTemporary(InputVector.getValueType());
22989 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, InputVector, StackPtr,
22990 MachinePointerInfo(), false, false, 0);
22992 EVT ElementType = InputVector.getValueType().getVectorElementType();
22993 unsigned EltSize = ElementType.getSizeInBits() / 8;
22995 // Replace each use (extract) with a load of the appropriate element.
22996 for (unsigned i = 0; i < 4; ++i) {
22997 uint64_t Offset = EltSize * i;
22998 auto PtrVT = TLI.getPointerTy(DAG.getDataLayout());
22999 SDValue OffsetVal = DAG.getConstant(Offset, dl, PtrVT);
23001 SDValue ScalarAddr =
23002 DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, OffsetVal);
23004 // Load the scalar.
23005 Vals[i] = DAG.getLoad(ElementType, dl, Ch,
23006 ScalarAddr, MachinePointerInfo(),
23007 false, false, false, 0);
23012 // Replace the extracts
23013 for (SmallVectorImpl<SDNode *>::iterator UI = Uses.begin(),
23014 UE = Uses.end(); UI != UE; ++UI) {
23015 SDNode *Extract = *UI;
23017 SDValue Idx = Extract->getOperand(1);
23018 uint64_t IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
23019 DAG.ReplaceAllUsesOfValueWith(SDValue(Extract, 0), Vals[IdxVal]);
23022 // The replacement was made in place; don't return anything.
23027 transformVSELECTtoBlendVECTOR_SHUFFLE(SDNode *N, SelectionDAG &DAG,
23028 const X86Subtarget *Subtarget) {
23030 SDValue Cond = N->getOperand(0);
23031 SDValue LHS = N->getOperand(1);
23032 SDValue RHS = N->getOperand(2);
23034 if (Cond.getOpcode() == ISD::SIGN_EXTEND) {
23035 SDValue CondSrc = Cond->getOperand(0);
23036 if (CondSrc->getOpcode() == ISD::SIGN_EXTEND_INREG)
23037 Cond = CondSrc->getOperand(0);
23040 if (!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode()))
23043 // A vselect where all conditions and data are constants can be optimized into
23044 // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR().
23045 if (ISD::isBuildVectorOfConstantSDNodes(LHS.getNode()) &&
23046 ISD::isBuildVectorOfConstantSDNodes(RHS.getNode()))
23049 unsigned MaskValue = 0;
23050 if (!BUILD_VECTORtoBlendMask(cast<BuildVectorSDNode>(Cond), MaskValue))
23053 MVT VT = N->getSimpleValueType(0);
23054 unsigned NumElems = VT.getVectorNumElements();
23055 SmallVector<int, 8> ShuffleMask(NumElems, -1);
23056 for (unsigned i = 0; i < NumElems; ++i) {
23057 // Be sure we emit undef where we can.
23058 if (Cond.getOperand(i)->getOpcode() == ISD::UNDEF)
23059 ShuffleMask[i] = -1;
23061 ShuffleMask[i] = i + NumElems * ((MaskValue >> i) & 1);
23064 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23065 if (!TLI.isShuffleMaskLegal(ShuffleMask, VT))
23067 return DAG.getVectorShuffle(VT, dl, LHS, RHS, &ShuffleMask[0]);
23070 /// PerformSELECTCombine - Do target-specific dag combines on SELECT and VSELECT
23072 static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG,
23073 TargetLowering::DAGCombinerInfo &DCI,
23074 const X86Subtarget *Subtarget) {
23076 SDValue Cond = N->getOperand(0);
23077 // Get the LHS/RHS of the select.
23078 SDValue LHS = N->getOperand(1);
23079 SDValue RHS = N->getOperand(2);
23080 EVT VT = LHS.getValueType();
23081 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23083 // If we have SSE[12] support, try to form min/max nodes. SSE min/max
23084 // instructions match the semantics of the common C idiom x<y?x:y but not
23085 // x<=y?x:y, because of how they handle negative zero (which can be
23086 // ignored in unsafe-math mode).
23087 // We also try to create v2f32 min/max nodes, which we later widen to v4f32.
23088 if (Cond.getOpcode() == ISD::SETCC && VT.isFloatingPoint() &&
23089 VT != MVT::f80 && (TLI.isTypeLegal(VT) || VT == MVT::v2f32) &&
23090 (Subtarget->hasSSE2() ||
23091 (Subtarget->hasSSE1() && VT.getScalarType() == MVT::f32))) {
23092 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23094 unsigned Opcode = 0;
23095 // Check for x CC y ? x : y.
23096 if (DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
23097 DAG.isEqualTo(RHS, Cond.getOperand(1))) {
23101 // Converting this to a min would handle NaNs incorrectly, and swapping
23102 // the operands would cause it to handle comparisons between positive
23103 // and negative zero incorrectly.
23104 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
23105 if (!DAG.getTarget().Options.UnsafeFPMath &&
23106 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
23108 std::swap(LHS, RHS);
23110 Opcode = X86ISD::FMIN;
23113 // Converting this to a min would handle comparisons between positive
23114 // and negative zero incorrectly.
23115 if (!DAG.getTarget().Options.UnsafeFPMath &&
23116 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
23118 Opcode = X86ISD::FMIN;
23121 // Converting this to a min would handle both negative zeros and NaNs
23122 // incorrectly, but we can swap the operands to fix both.
23123 std::swap(LHS, RHS);
23127 Opcode = X86ISD::FMIN;
23131 // Converting this to a max would handle comparisons between positive
23132 // and negative zero incorrectly.
23133 if (!DAG.getTarget().Options.UnsafeFPMath &&
23134 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
23136 Opcode = X86ISD::FMAX;
23139 // Converting this to a max would handle NaNs incorrectly, and swapping
23140 // the operands would cause it to handle comparisons between positive
23141 // and negative zero incorrectly.
23142 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
23143 if (!DAG.getTarget().Options.UnsafeFPMath &&
23144 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
23146 std::swap(LHS, RHS);
23148 Opcode = X86ISD::FMAX;
23151 // Converting this to a max would handle both negative zeros and NaNs
23152 // incorrectly, but we can swap the operands to fix both.
23153 std::swap(LHS, RHS);
23157 Opcode = X86ISD::FMAX;
23160 // Check for x CC y ? y : x -- a min/max with reversed arms.
23161 } else if (DAG.isEqualTo(LHS, Cond.getOperand(1)) &&
23162 DAG.isEqualTo(RHS, Cond.getOperand(0))) {
23166 // Converting this to a min would handle comparisons between positive
23167 // and negative zero incorrectly, and swapping the operands would
23168 // cause it to handle NaNs incorrectly.
23169 if (!DAG.getTarget().Options.UnsafeFPMath &&
23170 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS))) {
23171 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23173 std::swap(LHS, RHS);
23175 Opcode = X86ISD::FMIN;
23178 // Converting this to a min would handle NaNs incorrectly.
23179 if (!DAG.getTarget().Options.UnsafeFPMath &&
23180 (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)))
23182 Opcode = X86ISD::FMIN;
23185 // Converting this to a min would handle both negative zeros and NaNs
23186 // incorrectly, but we can swap the operands to fix both.
23187 std::swap(LHS, RHS);
23191 Opcode = X86ISD::FMIN;
23195 // Converting this to a max would handle NaNs incorrectly.
23196 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23198 Opcode = X86ISD::FMAX;
23201 // Converting this to a max would handle comparisons between positive
23202 // and negative zero incorrectly, and swapping the operands would
23203 // cause it to handle NaNs incorrectly.
23204 if (!DAG.getTarget().Options.UnsafeFPMath &&
23205 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS)) {
23206 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23208 std::swap(LHS, RHS);
23210 Opcode = X86ISD::FMAX;
23213 // Converting this to a max would handle both negative zeros and NaNs
23214 // incorrectly, but we can swap the operands to fix both.
23215 std::swap(LHS, RHS);
23219 Opcode = X86ISD::FMAX;
23225 return DAG.getNode(Opcode, DL, N->getValueType(0), LHS, RHS);
23228 EVT CondVT = Cond.getValueType();
23229 if (Subtarget->hasAVX512() && VT.isVector() && CondVT.isVector() &&
23230 CondVT.getVectorElementType() == MVT::i1) {
23231 // v16i8 (select v16i1, v16i8, v16i8) does not have a proper
23232 // lowering on KNL. In this case we convert it to
23233 // v16i8 (select v16i8, v16i8, v16i8) and use AVX instruction.
23234 // The same situation for all 128 and 256-bit vectors of i8 and i16.
23235 // Since SKX these selects have a proper lowering.
23236 EVT OpVT = LHS.getValueType();
23237 if ((OpVT.is128BitVector() || OpVT.is256BitVector()) &&
23238 (OpVT.getVectorElementType() == MVT::i8 ||
23239 OpVT.getVectorElementType() == MVT::i16) &&
23240 !(Subtarget->hasBWI() && Subtarget->hasVLX())) {
23241 Cond = DAG.getNode(ISD::SIGN_EXTEND, DL, OpVT, Cond);
23242 DCI.AddToWorklist(Cond.getNode());
23243 return DAG.getNode(N->getOpcode(), DL, OpVT, Cond, LHS, RHS);
23246 // If this is a select between two integer constants, try to do some
23248 if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(LHS)) {
23249 if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(RHS))
23250 // Don't do this for crazy integer types.
23251 if (DAG.getTargetLoweringInfo().isTypeLegal(LHS.getValueType())) {
23252 // If this is efficiently invertible, canonicalize the LHSC/RHSC values
23253 // so that TrueC (the true value) is larger than FalseC.
23254 bool NeedsCondInvert = false;
23256 if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue()) &&
23257 // Efficiently invertible.
23258 (Cond.getOpcode() == ISD::SETCC || // setcc -> invertible.
23259 (Cond.getOpcode() == ISD::XOR && // xor(X, C) -> invertible.
23260 isa<ConstantSDNode>(Cond.getOperand(1))))) {
23261 NeedsCondInvert = true;
23262 std::swap(TrueC, FalseC);
23265 // Optimize C ? 8 : 0 -> zext(C) << 3. Likewise for any pow2/0.
23266 if (FalseC->getAPIntValue() == 0 &&
23267 TrueC->getAPIntValue().isPowerOf2()) {
23268 if (NeedsCondInvert) // Invert the condition if needed.
23269 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23270 DAG.getConstant(1, DL, Cond.getValueType()));
23272 // Zero extend the condition if needed.
23273 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, LHS.getValueType(), Cond);
23275 unsigned ShAmt = TrueC->getAPIntValue().logBase2();
23276 return DAG.getNode(ISD::SHL, DL, LHS.getValueType(), Cond,
23277 DAG.getConstant(ShAmt, DL, MVT::i8));
23280 // Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst.
23281 if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
23282 if (NeedsCondInvert) // Invert the condition if needed.
23283 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23284 DAG.getConstant(1, DL, Cond.getValueType()));
23286 // Zero extend the condition if needed.
23287 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
23288 FalseC->getValueType(0), Cond);
23289 return DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23290 SDValue(FalseC, 0));
23293 // Optimize cases that will turn into an LEA instruction. This requires
23294 // an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
23295 if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
23296 uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
23297 if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
23299 bool isFastMultiplier = false;
23301 switch ((unsigned char)Diff) {
23303 case 1: // result = add base, cond
23304 case 2: // result = lea base( , cond*2)
23305 case 3: // result = lea base(cond, cond*2)
23306 case 4: // result = lea base( , cond*4)
23307 case 5: // result = lea base(cond, cond*4)
23308 case 8: // result = lea base( , cond*8)
23309 case 9: // result = lea base(cond, cond*8)
23310 isFastMultiplier = true;
23315 if (isFastMultiplier) {
23316 APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
23317 if (NeedsCondInvert) // Invert the condition if needed.
23318 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23319 DAG.getConstant(1, DL, Cond.getValueType()));
23321 // Zero extend the condition if needed.
23322 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
23324 // Scale the condition by the difference.
23326 Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
23327 DAG.getConstant(Diff, DL,
23328 Cond.getValueType()));
23330 // Add the base if non-zero.
23331 if (FalseC->getAPIntValue() != 0)
23332 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23333 SDValue(FalseC, 0));
23340 // Canonicalize max and min:
23341 // (x > y) ? x : y -> (x >= y) ? x : y
23342 // (x < y) ? x : y -> (x <= y) ? x : y
23343 // This allows use of COND_S / COND_NS (see TranslateX86CC) which eliminates
23344 // the need for an extra compare
23345 // against zero. e.g.
23346 // (x - y) > 0 : (x - y) ? 0 -> (x - y) >= 0 : (x - y) ? 0
23348 // testl %edi, %edi
23350 // cmovgl %edi, %eax
23354 // cmovsl %eax, %edi
23355 if (N->getOpcode() == ISD::SELECT && Cond.getOpcode() == ISD::SETCC &&
23356 DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
23357 DAG.isEqualTo(RHS, Cond.getOperand(1))) {
23358 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23363 ISD::CondCode NewCC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGE;
23364 Cond = DAG.getSetCC(SDLoc(Cond), Cond.getValueType(),
23365 Cond.getOperand(0), Cond.getOperand(1), NewCC);
23366 return DAG.getNode(ISD::SELECT, DL, VT, Cond, LHS, RHS);
23371 // Early exit check
23372 if (!TLI.isTypeLegal(VT))
23375 // Match VSELECTs into subs with unsigned saturation.
23376 if (N->getOpcode() == ISD::VSELECT && Cond.getOpcode() == ISD::SETCC &&
23377 // psubus is available in SSE2 and AVX2 for i8 and i16 vectors.
23378 ((Subtarget->hasSSE2() && (VT == MVT::v16i8 || VT == MVT::v8i16)) ||
23379 (Subtarget->hasAVX2() && (VT == MVT::v32i8 || VT == MVT::v16i16)))) {
23380 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23382 // Check if one of the arms of the VSELECT is a zero vector. If it's on the
23383 // left side invert the predicate to simplify logic below.
23385 if (ISD::isBuildVectorAllZeros(LHS.getNode())) {
23387 CC = ISD::getSetCCInverse(CC, true);
23388 } else if (ISD::isBuildVectorAllZeros(RHS.getNode())) {
23392 if (Other.getNode() && Other->getNumOperands() == 2 &&
23393 DAG.isEqualTo(Other->getOperand(0), Cond.getOperand(0))) {
23394 SDValue OpLHS = Other->getOperand(0), OpRHS = Other->getOperand(1);
23395 SDValue CondRHS = Cond->getOperand(1);
23397 // Look for a general sub with unsigned saturation first.
23398 // x >= y ? x-y : 0 --> subus x, y
23399 // x > y ? x-y : 0 --> subus x, y
23400 if ((CC == ISD::SETUGE || CC == ISD::SETUGT) &&
23401 Other->getOpcode() == ISD::SUB && DAG.isEqualTo(OpRHS, CondRHS))
23402 return DAG.getNode(X86ISD::SUBUS, DL, VT, OpLHS, OpRHS);
23404 if (auto *OpRHSBV = dyn_cast<BuildVectorSDNode>(OpRHS))
23405 if (auto *OpRHSConst = OpRHSBV->getConstantSplatNode()) {
23406 if (auto *CondRHSBV = dyn_cast<BuildVectorSDNode>(CondRHS))
23407 if (auto *CondRHSConst = CondRHSBV->getConstantSplatNode())
23408 // If the RHS is a constant we have to reverse the const
23409 // canonicalization.
23410 // x > C-1 ? x+-C : 0 --> subus x, C
23411 if (CC == ISD::SETUGT && Other->getOpcode() == ISD::ADD &&
23412 CondRHSConst->getAPIntValue() ==
23413 (-OpRHSConst->getAPIntValue() - 1))
23414 return DAG.getNode(
23415 X86ISD::SUBUS, DL, VT, OpLHS,
23416 DAG.getConstant(-OpRHSConst->getAPIntValue(), DL, VT));
23418 // Another special case: If C was a sign bit, the sub has been
23419 // canonicalized into a xor.
23420 // FIXME: Would it be better to use computeKnownBits to determine
23421 // whether it's safe to decanonicalize the xor?
23422 // x s< 0 ? x^C : 0 --> subus x, C
23423 if (CC == ISD::SETLT && Other->getOpcode() == ISD::XOR &&
23424 ISD::isBuildVectorAllZeros(CondRHS.getNode()) &&
23425 OpRHSConst->getAPIntValue().isSignBit())
23426 // Note that we have to rebuild the RHS constant here to ensure we
23427 // don't rely on particular values of undef lanes.
23428 return DAG.getNode(
23429 X86ISD::SUBUS, DL, VT, OpLHS,
23430 DAG.getConstant(OpRHSConst->getAPIntValue(), DL, VT));
23435 // Simplify vector selection if condition value type matches vselect
23437 if (N->getOpcode() == ISD::VSELECT && CondVT == VT) {
23438 assert(Cond.getValueType().isVector() &&
23439 "vector select expects a vector selector!");
23441 bool TValIsAllOnes = ISD::isBuildVectorAllOnes(LHS.getNode());
23442 bool FValIsAllZeros = ISD::isBuildVectorAllZeros(RHS.getNode());
23444 // Try invert the condition if true value is not all 1s and false value
23446 if (!TValIsAllOnes && !FValIsAllZeros &&
23447 // Check if the selector will be produced by CMPP*/PCMP*
23448 Cond.getOpcode() == ISD::SETCC &&
23449 // Check if SETCC has already been promoted
23450 TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT) ==
23452 bool TValIsAllZeros = ISD::isBuildVectorAllZeros(LHS.getNode());
23453 bool FValIsAllOnes = ISD::isBuildVectorAllOnes(RHS.getNode());
23455 if (TValIsAllZeros || FValIsAllOnes) {
23456 SDValue CC = Cond.getOperand(2);
23457 ISD::CondCode NewCC =
23458 ISD::getSetCCInverse(cast<CondCodeSDNode>(CC)->get(),
23459 Cond.getOperand(0).getValueType().isInteger());
23460 Cond = DAG.getSetCC(DL, CondVT, Cond.getOperand(0), Cond.getOperand(1), NewCC);
23461 std::swap(LHS, RHS);
23462 TValIsAllOnes = FValIsAllOnes;
23463 FValIsAllZeros = TValIsAllZeros;
23467 if (TValIsAllOnes || FValIsAllZeros) {
23470 if (TValIsAllOnes && FValIsAllZeros)
23472 else if (TValIsAllOnes)
23474 DAG.getNode(ISD::OR, DL, CondVT, Cond, DAG.getBitcast(CondVT, RHS));
23475 else if (FValIsAllZeros)
23476 Ret = DAG.getNode(ISD::AND, DL, CondVT, Cond,
23477 DAG.getBitcast(CondVT, LHS));
23479 return DAG.getBitcast(VT, Ret);
23483 // We should generate an X86ISD::BLENDI from a vselect if its argument
23484 // is a sign_extend_inreg of an any_extend of a BUILD_VECTOR of
23485 // constants. This specific pattern gets generated when we split a
23486 // selector for a 512 bit vector in a machine without AVX512 (but with
23487 // 256-bit vectors), during legalization:
23489 // (vselect (sign_extend (any_extend (BUILD_VECTOR)) i1) LHS RHS)
23491 // Iff we find this pattern and the build_vectors are built from
23492 // constants, we translate the vselect into a shuffle_vector that we
23493 // know will be matched by LowerVECTOR_SHUFFLEtoBlend.
23494 if ((N->getOpcode() == ISD::VSELECT ||
23495 N->getOpcode() == X86ISD::SHRUNKBLEND) &&
23496 !DCI.isBeforeLegalize() && !VT.is512BitVector()) {
23497 SDValue Shuffle = transformVSELECTtoBlendVECTOR_SHUFFLE(N, DAG, Subtarget);
23498 if (Shuffle.getNode())
23502 // If this is a *dynamic* select (non-constant condition) and we can match
23503 // this node with one of the variable blend instructions, restructure the
23504 // condition so that the blends can use the high bit of each element and use
23505 // SimplifyDemandedBits to simplify the condition operand.
23506 if (N->getOpcode() == ISD::VSELECT && DCI.isBeforeLegalizeOps() &&
23507 !DCI.isBeforeLegalize() &&
23508 !ISD::isBuildVectorOfConstantSDNodes(Cond.getNode())) {
23509 unsigned BitWidth = Cond.getValueType().getScalarType().getSizeInBits();
23511 // Don't optimize vector selects that map to mask-registers.
23515 // We can only handle the cases where VSELECT is directly legal on the
23516 // subtarget. We custom lower VSELECT nodes with constant conditions and
23517 // this makes it hard to see whether a dynamic VSELECT will correctly
23518 // lower, so we both check the operation's status and explicitly handle the
23519 // cases where a *dynamic* blend will fail even though a constant-condition
23520 // blend could be custom lowered.
23521 // FIXME: We should find a better way to handle this class of problems.
23522 // Potentially, we should combine constant-condition vselect nodes
23523 // pre-legalization into shuffles and not mark as many types as custom
23525 if (!TLI.isOperationLegalOrCustom(ISD::VSELECT, VT))
23527 // FIXME: We don't support i16-element blends currently. We could and
23528 // should support them by making *all* the bits in the condition be set
23529 // rather than just the high bit and using an i8-element blend.
23530 if (VT.getScalarType() == MVT::i16)
23532 // Dynamic blending was only available from SSE4.1 onward.
23533 if (VT.getSizeInBits() == 128 && !Subtarget->hasSSE41())
23535 // Byte blends are only available in AVX2
23536 if (VT.getSizeInBits() == 256 && VT.getScalarType() == MVT::i8 &&
23537 !Subtarget->hasAVX2())
23540 assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size");
23541 APInt DemandedMask = APInt::getHighBitsSet(BitWidth, 1);
23543 APInt KnownZero, KnownOne;
23544 TargetLowering::TargetLoweringOpt TLO(DAG, DCI.isBeforeLegalize(),
23545 DCI.isBeforeLegalizeOps());
23546 if (TLO.ShrinkDemandedConstant(Cond, DemandedMask) ||
23547 TLI.SimplifyDemandedBits(Cond, DemandedMask, KnownZero, KnownOne,
23549 // If we changed the computation somewhere in the DAG, this change
23550 // will affect all users of Cond.
23551 // Make sure it is fine and update all the nodes so that we do not
23552 // use the generic VSELECT anymore. Otherwise, we may perform
23553 // wrong optimizations as we messed up with the actual expectation
23554 // for the vector boolean values.
23555 if (Cond != TLO.Old) {
23556 // Check all uses of that condition operand to check whether it will be
23557 // consumed by non-BLEND instructions, which may depend on all bits are
23559 for (SDNode::use_iterator I = Cond->use_begin(), E = Cond->use_end();
23561 if (I->getOpcode() != ISD::VSELECT)
23562 // TODO: Add other opcodes eventually lowered into BLEND.
23565 // Update all the users of the condition, before committing the change,
23566 // so that the VSELECT optimizations that expect the correct vector
23567 // boolean value will not be triggered.
23568 for (SDNode::use_iterator I = Cond->use_begin(), E = Cond->use_end();
23570 DAG.ReplaceAllUsesOfValueWith(
23572 DAG.getNode(X86ISD::SHRUNKBLEND, SDLoc(*I), I->getValueType(0),
23573 Cond, I->getOperand(1), I->getOperand(2)));
23574 DCI.CommitTargetLoweringOpt(TLO);
23577 // At this point, only Cond is changed. Change the condition
23578 // just for N to keep the opportunity to optimize all other
23579 // users their own way.
23580 DAG.ReplaceAllUsesOfValueWith(
23582 DAG.getNode(X86ISD::SHRUNKBLEND, SDLoc(N), N->getValueType(0),
23583 TLO.New, N->getOperand(1), N->getOperand(2)));
23591 // Check whether a boolean test is testing a boolean value generated by
23592 // X86ISD::SETCC. If so, return the operand of that SETCC and proper condition
23595 // Simplify the following patterns:
23596 // (Op (CMP (SETCC Cond EFLAGS) 1) EQ) or
23597 // (Op (CMP (SETCC Cond EFLAGS) 0) NEQ)
23598 // to (Op EFLAGS Cond)
23600 // (Op (CMP (SETCC Cond EFLAGS) 0) EQ) or
23601 // (Op (CMP (SETCC Cond EFLAGS) 1) NEQ)
23602 // to (Op EFLAGS !Cond)
23604 // where Op could be BRCOND or CMOV.
23606 static SDValue checkBoolTestSetCCCombine(SDValue Cmp, X86::CondCode &CC) {
23607 // Quit if not CMP and SUB with its value result used.
23608 if (Cmp.getOpcode() != X86ISD::CMP &&
23609 (Cmp.getOpcode() != X86ISD::SUB || Cmp.getNode()->hasAnyUseOfValue(0)))
23612 // Quit if not used as a boolean value.
23613 if (CC != X86::COND_E && CC != X86::COND_NE)
23616 // Check CMP operands. One of them should be 0 or 1 and the other should be
23617 // an SetCC or extended from it.
23618 SDValue Op1 = Cmp.getOperand(0);
23619 SDValue Op2 = Cmp.getOperand(1);
23622 const ConstantSDNode* C = nullptr;
23623 bool needOppositeCond = (CC == X86::COND_E);
23624 bool checkAgainstTrue = false; // Is it a comparison against 1?
23626 if ((C = dyn_cast<ConstantSDNode>(Op1)))
23628 else if ((C = dyn_cast<ConstantSDNode>(Op2)))
23630 else // Quit if all operands are not constants.
23633 if (C->getZExtValue() == 1) {
23634 needOppositeCond = !needOppositeCond;
23635 checkAgainstTrue = true;
23636 } else if (C->getZExtValue() != 0)
23637 // Quit if the constant is neither 0 or 1.
23640 bool truncatedToBoolWithAnd = false;
23641 // Skip (zext $x), (trunc $x), or (and $x, 1) node.
23642 while (SetCC.getOpcode() == ISD::ZERO_EXTEND ||
23643 SetCC.getOpcode() == ISD::TRUNCATE ||
23644 SetCC.getOpcode() == ISD::AND) {
23645 if (SetCC.getOpcode() == ISD::AND) {
23647 ConstantSDNode *CS;
23648 if ((CS = dyn_cast<ConstantSDNode>(SetCC.getOperand(0))) &&
23649 CS->getZExtValue() == 1)
23651 if ((CS = dyn_cast<ConstantSDNode>(SetCC.getOperand(1))) &&
23652 CS->getZExtValue() == 1)
23656 SetCC = SetCC.getOperand(OpIdx);
23657 truncatedToBoolWithAnd = true;
23659 SetCC = SetCC.getOperand(0);
23662 switch (SetCC.getOpcode()) {
23663 case X86ISD::SETCC_CARRY:
23664 // Since SETCC_CARRY gives output based on R = CF ? ~0 : 0, it's unsafe to
23665 // simplify it if the result of SETCC_CARRY is not canonicalized to 0 or 1,
23666 // i.e. it's a comparison against true but the result of SETCC_CARRY is not
23667 // truncated to i1 using 'and'.
23668 if (checkAgainstTrue && !truncatedToBoolWithAnd)
23670 assert(X86::CondCode(SetCC.getConstantOperandVal(0)) == X86::COND_B &&
23671 "Invalid use of SETCC_CARRY!");
23673 case X86ISD::SETCC:
23674 // Set the condition code or opposite one if necessary.
23675 CC = X86::CondCode(SetCC.getConstantOperandVal(0));
23676 if (needOppositeCond)
23677 CC = X86::GetOppositeBranchCondition(CC);
23678 return SetCC.getOperand(1);
23679 case X86ISD::CMOV: {
23680 // Check whether false/true value has canonical one, i.e. 0 or 1.
23681 ConstantSDNode *FVal = dyn_cast<ConstantSDNode>(SetCC.getOperand(0));
23682 ConstantSDNode *TVal = dyn_cast<ConstantSDNode>(SetCC.getOperand(1));
23683 // Quit if true value is not a constant.
23686 // Quit if false value is not a constant.
23688 SDValue Op = SetCC.getOperand(0);
23689 // Skip 'zext' or 'trunc' node.
23690 if (Op.getOpcode() == ISD::ZERO_EXTEND ||
23691 Op.getOpcode() == ISD::TRUNCATE)
23692 Op = Op.getOperand(0);
23693 // A special case for rdrand/rdseed, where 0 is set if false cond is
23695 if ((Op.getOpcode() != X86ISD::RDRAND &&
23696 Op.getOpcode() != X86ISD::RDSEED) || Op.getResNo() != 0)
23699 // Quit if false value is not the constant 0 or 1.
23700 bool FValIsFalse = true;
23701 if (FVal && FVal->getZExtValue() != 0) {
23702 if (FVal->getZExtValue() != 1)
23704 // If FVal is 1, opposite cond is needed.
23705 needOppositeCond = !needOppositeCond;
23706 FValIsFalse = false;
23708 // Quit if TVal is not the constant opposite of FVal.
23709 if (FValIsFalse && TVal->getZExtValue() != 1)
23711 if (!FValIsFalse && TVal->getZExtValue() != 0)
23713 CC = X86::CondCode(SetCC.getConstantOperandVal(2));
23714 if (needOppositeCond)
23715 CC = X86::GetOppositeBranchCondition(CC);
23716 return SetCC.getOperand(3);
23723 /// Check whether Cond is an AND/OR of SETCCs off of the same EFLAGS.
23725 /// (X86or (X86setcc) (X86setcc))
23726 /// (X86cmp (and (X86setcc) (X86setcc)), 0)
23727 static bool checkBoolTestAndOrSetCCCombine(SDValue Cond, X86::CondCode &CC0,
23728 X86::CondCode &CC1, SDValue &Flags,
23730 if (Cond->getOpcode() == X86ISD::CMP) {
23731 ConstantSDNode *CondOp1C = dyn_cast<ConstantSDNode>(Cond->getOperand(1));
23732 if (!CondOp1C || !CondOp1C->isNullValue())
23735 Cond = Cond->getOperand(0);
23740 SDValue SetCC0, SetCC1;
23741 switch (Cond->getOpcode()) {
23742 default: return false;
23749 SetCC0 = Cond->getOperand(0);
23750 SetCC1 = Cond->getOperand(1);
23754 // Make sure we have SETCC nodes, using the same flags value.
23755 if (SetCC0.getOpcode() != X86ISD::SETCC ||
23756 SetCC1.getOpcode() != X86ISD::SETCC ||
23757 SetCC0->getOperand(1) != SetCC1->getOperand(1))
23760 CC0 = (X86::CondCode)SetCC0->getConstantOperandVal(0);
23761 CC1 = (X86::CondCode)SetCC1->getConstantOperandVal(0);
23762 Flags = SetCC0->getOperand(1);
23766 /// Optimize X86ISD::CMOV [LHS, RHS, CONDCODE (e.g. X86::COND_NE), CONDVAL]
23767 static SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG,
23768 TargetLowering::DAGCombinerInfo &DCI,
23769 const X86Subtarget *Subtarget) {
23772 // If the flag operand isn't dead, don't touch this CMOV.
23773 if (N->getNumValues() == 2 && !SDValue(N, 1).use_empty())
23776 SDValue FalseOp = N->getOperand(0);
23777 SDValue TrueOp = N->getOperand(1);
23778 X86::CondCode CC = (X86::CondCode)N->getConstantOperandVal(2);
23779 SDValue Cond = N->getOperand(3);
23781 if (CC == X86::COND_E || CC == X86::COND_NE) {
23782 switch (Cond.getOpcode()) {
23786 // If operand of BSR / BSF are proven never zero, then ZF cannot be set.
23787 if (DAG.isKnownNeverZero(Cond.getOperand(0)))
23788 return (CC == X86::COND_E) ? FalseOp : TrueOp;
23794 Flags = checkBoolTestSetCCCombine(Cond, CC);
23795 if (Flags.getNode() &&
23796 // Extra check as FCMOV only supports a subset of X86 cond.
23797 (FalseOp.getValueType() != MVT::f80 || hasFPCMov(CC))) {
23798 SDValue Ops[] = { FalseOp, TrueOp,
23799 DAG.getConstant(CC, DL, MVT::i8), Flags };
23800 return DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), Ops);
23803 // If this is a select between two integer constants, try to do some
23804 // optimizations. Note that the operands are ordered the opposite of SELECT
23806 if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(TrueOp)) {
23807 if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(FalseOp)) {
23808 // Canonicalize the TrueC/FalseC values so that TrueC (the true value) is
23809 // larger than FalseC (the false value).
23810 if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue())) {
23811 CC = X86::GetOppositeBranchCondition(CC);
23812 std::swap(TrueC, FalseC);
23813 std::swap(TrueOp, FalseOp);
23816 // Optimize C ? 8 : 0 -> zext(setcc(C)) << 3. Likewise for any pow2/0.
23817 // This is efficient for any integer data type (including i8/i16) and
23819 if (FalseC->getAPIntValue() == 0 && TrueC->getAPIntValue().isPowerOf2()) {
23820 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
23821 DAG.getConstant(CC, DL, MVT::i8), Cond);
23823 // Zero extend the condition if needed.
23824 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, TrueC->getValueType(0), Cond);
23826 unsigned ShAmt = TrueC->getAPIntValue().logBase2();
23827 Cond = DAG.getNode(ISD::SHL, DL, Cond.getValueType(), Cond,
23828 DAG.getConstant(ShAmt, DL, MVT::i8));
23829 if (N->getNumValues() == 2) // Dead flag value?
23830 return DCI.CombineTo(N, Cond, SDValue());
23834 // Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst. This is efficient
23835 // for any integer data type, including i8/i16.
23836 if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
23837 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
23838 DAG.getConstant(CC, DL, MVT::i8), Cond);
23840 // Zero extend the condition if needed.
23841 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
23842 FalseC->getValueType(0), Cond);
23843 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23844 SDValue(FalseC, 0));
23846 if (N->getNumValues() == 2) // Dead flag value?
23847 return DCI.CombineTo(N, Cond, SDValue());
23851 // Optimize cases that will turn into an LEA instruction. This requires
23852 // an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
23853 if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
23854 uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
23855 if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
23857 bool isFastMultiplier = false;
23859 switch ((unsigned char)Diff) {
23861 case 1: // result = add base, cond
23862 case 2: // result = lea base( , cond*2)
23863 case 3: // result = lea base(cond, cond*2)
23864 case 4: // result = lea base( , cond*4)
23865 case 5: // result = lea base(cond, cond*4)
23866 case 8: // result = lea base( , cond*8)
23867 case 9: // result = lea base(cond, cond*8)
23868 isFastMultiplier = true;
23873 if (isFastMultiplier) {
23874 APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
23875 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
23876 DAG.getConstant(CC, DL, MVT::i8), Cond);
23877 // Zero extend the condition if needed.
23878 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
23880 // Scale the condition by the difference.
23882 Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
23883 DAG.getConstant(Diff, DL, Cond.getValueType()));
23885 // Add the base if non-zero.
23886 if (FalseC->getAPIntValue() != 0)
23887 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23888 SDValue(FalseC, 0));
23889 if (N->getNumValues() == 2) // Dead flag value?
23890 return DCI.CombineTo(N, Cond, SDValue());
23897 // Handle these cases:
23898 // (select (x != c), e, c) -> select (x != c), e, x),
23899 // (select (x == c), c, e) -> select (x == c), x, e)
23900 // where the c is an integer constant, and the "select" is the combination
23901 // of CMOV and CMP.
23903 // The rationale for this change is that the conditional-move from a constant
23904 // needs two instructions, however, conditional-move from a register needs
23905 // only one instruction.
23907 // CAVEAT: By replacing a constant with a symbolic value, it may obscure
23908 // some instruction-combining opportunities. This opt needs to be
23909 // postponed as late as possible.
23911 if (!DCI.isBeforeLegalize() && !DCI.isBeforeLegalizeOps()) {
23912 // the DCI.xxxx conditions are provided to postpone the optimization as
23913 // late as possible.
23915 ConstantSDNode *CmpAgainst = nullptr;
23916 if ((Cond.getOpcode() == X86ISD::CMP || Cond.getOpcode() == X86ISD::SUB) &&
23917 (CmpAgainst = dyn_cast<ConstantSDNode>(Cond.getOperand(1))) &&
23918 !isa<ConstantSDNode>(Cond.getOperand(0))) {
23920 if (CC == X86::COND_NE &&
23921 CmpAgainst == dyn_cast<ConstantSDNode>(FalseOp)) {
23922 CC = X86::GetOppositeBranchCondition(CC);
23923 std::swap(TrueOp, FalseOp);
23926 if (CC == X86::COND_E &&
23927 CmpAgainst == dyn_cast<ConstantSDNode>(TrueOp)) {
23928 SDValue Ops[] = { FalseOp, Cond.getOperand(0),
23929 DAG.getConstant(CC, DL, MVT::i8), Cond };
23930 return DAG.getNode(X86ISD::CMOV, DL, N->getVTList (), Ops);
23935 // Fold and/or of setcc's to double CMOV:
23936 // (CMOV F, T, ((cc1 | cc2) != 0)) -> (CMOV (CMOV F, T, cc1), T, cc2)
23937 // (CMOV F, T, ((cc1 & cc2) != 0)) -> (CMOV (CMOV T, F, !cc1), F, !cc2)
23939 // This combine lets us generate:
23940 // cmovcc1 (jcc1 if we don't have CMOV)
23946 // cmovne (jne if we don't have CMOV)
23947 // When we can't use the CMOV instruction, it might increase branch
23949 // When we can use CMOV, or when there is no mispredict, this improves
23950 // throughput and reduces register pressure.
23952 if (CC == X86::COND_NE) {
23954 X86::CondCode CC0, CC1;
23956 if (checkBoolTestAndOrSetCCCombine(Cond, CC0, CC1, Flags, isAndSetCC)) {
23958 std::swap(FalseOp, TrueOp);
23959 CC0 = X86::GetOppositeBranchCondition(CC0);
23960 CC1 = X86::GetOppositeBranchCondition(CC1);
23963 SDValue LOps[] = {FalseOp, TrueOp, DAG.getConstant(CC0, DL, MVT::i8),
23965 SDValue LCMOV = DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), LOps);
23966 SDValue Ops[] = {LCMOV, TrueOp, DAG.getConstant(CC1, DL, MVT::i8), Flags};
23967 SDValue CMOV = DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), Ops);
23968 DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), SDValue(CMOV.getNode(), 1));
23976 /// PerformMulCombine - Optimize a single multiply with constant into two
23977 /// in order to implement it with two cheaper instructions, e.g.
23978 /// LEA + SHL, LEA + LEA.
23979 static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
23980 TargetLowering::DAGCombinerInfo &DCI) {
23981 // An imul is usually smaller than the alternative sequence.
23982 if (DAG.getMachineFunction().getFunction()->optForMinSize())
23985 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
23988 EVT VT = N->getValueType(0);
23989 if (VT != MVT::i64 && VT != MVT::i32)
23992 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
23995 uint64_t MulAmt = C->getZExtValue();
23996 if (isPowerOf2_64(MulAmt) || MulAmt == 3 || MulAmt == 5 || MulAmt == 9)
23999 uint64_t MulAmt1 = 0;
24000 uint64_t MulAmt2 = 0;
24001 if ((MulAmt % 9) == 0) {
24003 MulAmt2 = MulAmt / 9;
24004 } else if ((MulAmt % 5) == 0) {
24006 MulAmt2 = MulAmt / 5;
24007 } else if ((MulAmt % 3) == 0) {
24009 MulAmt2 = MulAmt / 3;
24012 (isPowerOf2_64(MulAmt2) || MulAmt2 == 3 || MulAmt2 == 5 || MulAmt2 == 9)){
24015 if (isPowerOf2_64(MulAmt2) &&
24016 !(N->hasOneUse() && N->use_begin()->getOpcode() == ISD::ADD))
24017 // If second multiplifer is pow2, issue it first. We want the multiply by
24018 // 3, 5, or 9 to be folded into the addressing mode unless the lone use
24020 std::swap(MulAmt1, MulAmt2);
24023 if (isPowerOf2_64(MulAmt1))
24024 NewMul = DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
24025 DAG.getConstant(Log2_64(MulAmt1), DL, MVT::i8));
24027 NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, N->getOperand(0),
24028 DAG.getConstant(MulAmt1, DL, VT));
24030 if (isPowerOf2_64(MulAmt2))
24031 NewMul = DAG.getNode(ISD::SHL, DL, VT, NewMul,
24032 DAG.getConstant(Log2_64(MulAmt2), DL, MVT::i8));
24034 NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, NewMul,
24035 DAG.getConstant(MulAmt2, DL, VT));
24037 // Do not add new nodes to DAG combiner worklist.
24038 DCI.CombineTo(N, NewMul, false);
24043 static SDValue PerformSHLCombine(SDNode *N, SelectionDAG &DAG) {
24044 SDValue N0 = N->getOperand(0);
24045 SDValue N1 = N->getOperand(1);
24046 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
24047 EVT VT = N0.getValueType();
24049 // fold (shl (and (setcc_c), c1), c2) -> (and setcc_c, (c1 << c2))
24050 // since the result of setcc_c is all zero's or all ones.
24051 if (VT.isInteger() && !VT.isVector() &&
24052 N1C && N0.getOpcode() == ISD::AND &&
24053 N0.getOperand(1).getOpcode() == ISD::Constant) {
24054 SDValue N00 = N0.getOperand(0);
24055 APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
24056 APInt ShAmt = N1C->getAPIntValue();
24057 Mask = Mask.shl(ShAmt);
24058 bool MaskOK = false;
24059 // We can handle cases concerning bit-widening nodes containing setcc_c if
24060 // we carefully interrogate the mask to make sure we are semantics
24062 // The transform is not safe if the result of C1 << C2 exceeds the bitwidth
24063 // of the underlying setcc_c operation if the setcc_c was zero extended.
24064 // Consider the following example:
24065 // zext(setcc_c) -> i32 0x0000FFFF
24066 // c1 -> i32 0x0000FFFF
24067 // c2 -> i32 0x00000001
24068 // (shl (and (setcc_c), c1), c2) -> i32 0x0001FFFE
24069 // (and setcc_c, (c1 << c2)) -> i32 0x0000FFFE
24070 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
24072 } else if (N00.getOpcode() == ISD::SIGN_EXTEND &&
24073 N00.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
24075 } else if ((N00.getOpcode() == ISD::ZERO_EXTEND ||
24076 N00.getOpcode() == ISD::ANY_EXTEND) &&
24077 N00.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
24078 MaskOK = Mask.isIntN(N00.getOperand(0).getValueSizeInBits());
24080 if (MaskOK && Mask != 0) {
24082 return DAG.getNode(ISD::AND, DL, VT, N00, DAG.getConstant(Mask, DL, VT));
24086 // Hardware support for vector shifts is sparse which makes us scalarize the
24087 // vector operations in many cases. Also, on sandybridge ADD is faster than
24089 // (shl V, 1) -> add V,V
24090 if (auto *N1BV = dyn_cast<BuildVectorSDNode>(N1))
24091 if (auto *N1SplatC = N1BV->getConstantSplatNode()) {
24092 assert(N0.getValueType().isVector() && "Invalid vector shift type");
24093 // We shift all of the values by one. In many cases we do not have
24094 // hardware support for this operation. This is better expressed as an ADD
24096 if (N1SplatC->getAPIntValue() == 1)
24097 return DAG.getNode(ISD::ADD, SDLoc(N), VT, N0, N0);
24103 /// \brief Returns a vector of 0s if the node in input is a vector logical
24104 /// shift by a constant amount which is known to be bigger than or equal
24105 /// to the vector element size in bits.
24106 static SDValue performShiftToAllZeros(SDNode *N, SelectionDAG &DAG,
24107 const X86Subtarget *Subtarget) {
24108 EVT VT = N->getValueType(0);
24110 if (VT != MVT::v2i64 && VT != MVT::v4i32 && VT != MVT::v8i16 &&
24111 (!Subtarget->hasInt256() ||
24112 (VT != MVT::v4i64 && VT != MVT::v8i32 && VT != MVT::v16i16)))
24115 SDValue Amt = N->getOperand(1);
24117 if (auto *AmtBV = dyn_cast<BuildVectorSDNode>(Amt))
24118 if (auto *AmtSplat = AmtBV->getConstantSplatNode()) {
24119 APInt ShiftAmt = AmtSplat->getAPIntValue();
24120 unsigned MaxAmount = VT.getVectorElementType().getSizeInBits();
24122 // SSE2/AVX2 logical shifts always return a vector of 0s
24123 // if the shift amount is bigger than or equal to
24124 // the element size. The constant shift amount will be
24125 // encoded as a 8-bit immediate.
24126 if (ShiftAmt.trunc(8).uge(MaxAmount))
24127 return getZeroVector(VT, Subtarget, DAG, DL);
24133 /// PerformShiftCombine - Combine shifts.
24134 static SDValue PerformShiftCombine(SDNode* N, SelectionDAG &DAG,
24135 TargetLowering::DAGCombinerInfo &DCI,
24136 const X86Subtarget *Subtarget) {
24137 if (N->getOpcode() == ISD::SHL)
24138 if (SDValue V = PerformSHLCombine(N, DAG))
24141 // Try to fold this logical shift into a zero vector.
24142 if (N->getOpcode() != ISD::SRA)
24143 if (SDValue V = performShiftToAllZeros(N, DAG, Subtarget))
24149 // CMPEQCombine - Recognize the distinctive (AND (setcc ...) (setcc ..))
24150 // where both setccs reference the same FP CMP, and rewrite for CMPEQSS
24151 // and friends. Likewise for OR -> CMPNEQSS.
24152 static SDValue CMPEQCombine(SDNode *N, SelectionDAG &DAG,
24153 TargetLowering::DAGCombinerInfo &DCI,
24154 const X86Subtarget *Subtarget) {
24157 // SSE1 supports CMP{eq|ne}SS, and SSE2 added CMP{eq|ne}SD, but
24158 // we're requiring SSE2 for both.
24159 if (Subtarget->hasSSE2() && isAndOrOfSetCCs(SDValue(N, 0U), opcode)) {
24160 SDValue N0 = N->getOperand(0);
24161 SDValue N1 = N->getOperand(1);
24162 SDValue CMP0 = N0->getOperand(1);
24163 SDValue CMP1 = N1->getOperand(1);
24166 // The SETCCs should both refer to the same CMP.
24167 if (CMP0.getOpcode() != X86ISD::CMP || CMP0 != CMP1)
24170 SDValue CMP00 = CMP0->getOperand(0);
24171 SDValue CMP01 = CMP0->getOperand(1);
24172 EVT VT = CMP00.getValueType();
24174 if (VT == MVT::f32 || VT == MVT::f64) {
24175 bool ExpectingFlags = false;
24176 // Check for any users that want flags:
24177 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
24178 !ExpectingFlags && UI != UE; ++UI)
24179 switch (UI->getOpcode()) {
24184 ExpectingFlags = true;
24186 case ISD::CopyToReg:
24187 case ISD::SIGN_EXTEND:
24188 case ISD::ZERO_EXTEND:
24189 case ISD::ANY_EXTEND:
24193 if (!ExpectingFlags) {
24194 enum X86::CondCode cc0 = (enum X86::CondCode)N0.getConstantOperandVal(0);
24195 enum X86::CondCode cc1 = (enum X86::CondCode)N1.getConstantOperandVal(0);
24197 if (cc1 == X86::COND_E || cc1 == X86::COND_NE) {
24198 X86::CondCode tmp = cc0;
24203 if ((cc0 == X86::COND_E && cc1 == X86::COND_NP) ||
24204 (cc0 == X86::COND_NE && cc1 == X86::COND_P)) {
24205 // FIXME: need symbolic constants for these magic numbers.
24206 // See X86ATTInstPrinter.cpp:printSSECC().
24207 unsigned x86cc = (cc0 == X86::COND_E) ? 0 : 4;
24208 if (Subtarget->hasAVX512()) {
24209 SDValue FSetCC = DAG.getNode(X86ISD::FSETCC, DL, MVT::i1, CMP00,
24211 DAG.getConstant(x86cc, DL, MVT::i8));
24212 if (N->getValueType(0) != MVT::i1)
24213 return DAG.getNode(ISD::ZERO_EXTEND, DL, N->getValueType(0),
24217 SDValue OnesOrZeroesF = DAG.getNode(X86ISD::FSETCC, DL,
24218 CMP00.getValueType(), CMP00, CMP01,
24219 DAG.getConstant(x86cc, DL,
24222 bool is64BitFP = (CMP00.getValueType() == MVT::f64);
24223 MVT IntVT = is64BitFP ? MVT::i64 : MVT::i32;
24225 if (is64BitFP && !Subtarget->is64Bit()) {
24226 // On a 32-bit target, we cannot bitcast the 64-bit float to a
24227 // 64-bit integer, since that's not a legal type. Since
24228 // OnesOrZeroesF is all ones of all zeroes, we don't need all the
24229 // bits, but can do this little dance to extract the lowest 32 bits
24230 // and work with those going forward.
24231 SDValue Vector64 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, MVT::v2f64,
24233 SDValue Vector32 = DAG.getBitcast(MVT::v4f32, Vector64);
24234 OnesOrZeroesF = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32,
24235 Vector32, DAG.getIntPtrConstant(0, DL));
24239 SDValue OnesOrZeroesI = DAG.getBitcast(IntVT, OnesOrZeroesF);
24240 SDValue ANDed = DAG.getNode(ISD::AND, DL, IntVT, OnesOrZeroesI,
24241 DAG.getConstant(1, DL, IntVT));
24242 SDValue OneBitOfTruth = DAG.getNode(ISD::TRUNCATE, DL, MVT::i8,
24244 return OneBitOfTruth;
24252 /// CanFoldXORWithAllOnes - Test whether the XOR operand is a AllOnes vector
24253 /// so it can be folded inside ANDNP.
24254 static bool CanFoldXORWithAllOnes(const SDNode *N) {
24255 EVT VT = N->getValueType(0);
24257 // Match direct AllOnes for 128 and 256-bit vectors
24258 if (ISD::isBuildVectorAllOnes(N))
24261 // Look through a bit convert.
24262 if (N->getOpcode() == ISD::BITCAST)
24263 N = N->getOperand(0).getNode();
24265 // Sometimes the operand may come from a insert_subvector building a 256-bit
24267 if (VT.is256BitVector() &&
24268 N->getOpcode() == ISD::INSERT_SUBVECTOR) {
24269 SDValue V1 = N->getOperand(0);
24270 SDValue V2 = N->getOperand(1);
24272 if (V1.getOpcode() == ISD::INSERT_SUBVECTOR &&
24273 V1.getOperand(0).getOpcode() == ISD::UNDEF &&
24274 ISD::isBuildVectorAllOnes(V1.getOperand(1).getNode()) &&
24275 ISD::isBuildVectorAllOnes(V2.getNode()))
24282 // On AVX/AVX2 the type v8i1 is legalized to v8i16, which is an XMM sized
24283 // register. In most cases we actually compare or select YMM-sized registers
24284 // and mixing the two types creates horrible code. This method optimizes
24285 // some of the transition sequences.
24286 static SDValue WidenMaskArithmetic(SDNode *N, SelectionDAG &DAG,
24287 TargetLowering::DAGCombinerInfo &DCI,
24288 const X86Subtarget *Subtarget) {
24289 EVT VT = N->getValueType(0);
24290 if (!VT.is256BitVector())
24293 assert((N->getOpcode() == ISD::ANY_EXTEND ||
24294 N->getOpcode() == ISD::ZERO_EXTEND ||
24295 N->getOpcode() == ISD::SIGN_EXTEND) && "Invalid Node");
24297 SDValue Narrow = N->getOperand(0);
24298 EVT NarrowVT = Narrow->getValueType(0);
24299 if (!NarrowVT.is128BitVector())
24302 if (Narrow->getOpcode() != ISD::XOR &&
24303 Narrow->getOpcode() != ISD::AND &&
24304 Narrow->getOpcode() != ISD::OR)
24307 SDValue N0 = Narrow->getOperand(0);
24308 SDValue N1 = Narrow->getOperand(1);
24311 // The Left side has to be a trunc.
24312 if (N0.getOpcode() != ISD::TRUNCATE)
24315 // The type of the truncated inputs.
24316 EVT WideVT = N0->getOperand(0)->getValueType(0);
24320 // The right side has to be a 'trunc' or a constant vector.
24321 bool RHSTrunc = N1.getOpcode() == ISD::TRUNCATE;
24322 ConstantSDNode *RHSConstSplat = nullptr;
24323 if (auto *RHSBV = dyn_cast<BuildVectorSDNode>(N1))
24324 RHSConstSplat = RHSBV->getConstantSplatNode();
24325 if (!RHSTrunc && !RHSConstSplat)
24328 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
24330 if (!TLI.isOperationLegalOrPromote(Narrow->getOpcode(), WideVT))
24333 // Set N0 and N1 to hold the inputs to the new wide operation.
24334 N0 = N0->getOperand(0);
24335 if (RHSConstSplat) {
24336 N1 = DAG.getNode(ISD::ZERO_EXTEND, DL, WideVT.getScalarType(),
24337 SDValue(RHSConstSplat, 0));
24338 SmallVector<SDValue, 8> C(WideVT.getVectorNumElements(), N1);
24339 N1 = DAG.getNode(ISD::BUILD_VECTOR, DL, WideVT, C);
24340 } else if (RHSTrunc) {
24341 N1 = N1->getOperand(0);
24344 // Generate the wide operation.
24345 SDValue Op = DAG.getNode(Narrow->getOpcode(), DL, WideVT, N0, N1);
24346 unsigned Opcode = N->getOpcode();
24348 case ISD::ANY_EXTEND:
24350 case ISD::ZERO_EXTEND: {
24351 unsigned InBits = NarrowVT.getScalarType().getSizeInBits();
24352 APInt Mask = APInt::getAllOnesValue(InBits);
24353 Mask = Mask.zext(VT.getScalarType().getSizeInBits());
24354 return DAG.getNode(ISD::AND, DL, VT,
24355 Op, DAG.getConstant(Mask, DL, VT));
24357 case ISD::SIGN_EXTEND:
24358 return DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, VT,
24359 Op, DAG.getValueType(NarrowVT));
24361 llvm_unreachable("Unexpected opcode");
24365 static SDValue VectorZextCombine(SDNode *N, SelectionDAG &DAG,
24366 TargetLowering::DAGCombinerInfo &DCI,
24367 const X86Subtarget *Subtarget) {
24368 SDValue N0 = N->getOperand(0);
24369 SDValue N1 = N->getOperand(1);
24372 // A vector zext_in_reg may be represented as a shuffle,
24373 // feeding into a bitcast (this represents anyext) feeding into
24374 // an and with a mask.
24375 // We'd like to try to combine that into a shuffle with zero
24376 // plus a bitcast, removing the and.
24377 if (N0.getOpcode() != ISD::BITCAST ||
24378 N0.getOperand(0).getOpcode() != ISD::VECTOR_SHUFFLE)
24381 // The other side of the AND should be a splat of 2^C, where C
24382 // is the number of bits in the source type.
24383 if (N1.getOpcode() == ISD::BITCAST)
24384 N1 = N1.getOperand(0);
24385 if (N1.getOpcode() != ISD::BUILD_VECTOR)
24387 BuildVectorSDNode *Vector = cast<BuildVectorSDNode>(N1);
24389 ShuffleVectorSDNode *Shuffle = cast<ShuffleVectorSDNode>(N0.getOperand(0));
24390 EVT SrcType = Shuffle->getValueType(0);
24392 // We expect a single-source shuffle
24393 if (Shuffle->getOperand(1)->getOpcode() != ISD::UNDEF)
24396 unsigned SrcSize = SrcType.getScalarSizeInBits();
24398 APInt SplatValue, SplatUndef;
24399 unsigned SplatBitSize;
24401 if (!Vector->isConstantSplat(SplatValue, SplatUndef,
24402 SplatBitSize, HasAnyUndefs))
24405 unsigned ResSize = N1.getValueType().getScalarSizeInBits();
24406 // Make sure the splat matches the mask we expect
24407 if (SplatBitSize > ResSize ||
24408 (SplatValue + 1).exactLogBase2() != (int)SrcSize)
24411 // Make sure the input and output size make sense
24412 if (SrcSize >= ResSize || ResSize % SrcSize)
24415 // We expect a shuffle of the form <0, u, u, u, 1, u, u, u...>
24416 // The number of u's between each two values depends on the ratio between
24417 // the source and dest type.
24418 unsigned ZextRatio = ResSize / SrcSize;
24419 bool IsZext = true;
24420 for (unsigned i = 0; i < SrcType.getVectorNumElements(); ++i) {
24421 if (i % ZextRatio) {
24422 if (Shuffle->getMaskElt(i) > 0) {
24428 if (Shuffle->getMaskElt(i) != (int)(i / ZextRatio)) {
24429 // Expected element number
24439 // Ok, perform the transformation - replace the shuffle with
24440 // a shuffle of the form <0, k, k, k, 1, k, k, k> with zero
24441 // (instead of undef) where the k elements come from the zero vector.
24442 SmallVector<int, 8> Mask;
24443 unsigned NumElems = SrcType.getVectorNumElements();
24444 for (unsigned i = 0; i < NumElems; ++i)
24446 Mask.push_back(NumElems);
24448 Mask.push_back(i / ZextRatio);
24450 SDValue NewShuffle = DAG.getVectorShuffle(Shuffle->getValueType(0), DL,
24451 Shuffle->getOperand(0), DAG.getConstant(0, DL, SrcType), Mask);
24452 return DAG.getBitcast(N0.getValueType(), NewShuffle);
24455 /// If both input operands of a logic op are being cast from floating point
24456 /// types, try to convert this into a floating point logic node to avoid
24457 /// unnecessary moves from SSE to integer registers.
24458 static SDValue convertIntLogicToFPLogic(SDNode *N, SelectionDAG &DAG,
24459 const X86Subtarget *Subtarget) {
24460 unsigned FPOpcode = ISD::DELETED_NODE;
24461 if (N->getOpcode() == ISD::AND)
24462 FPOpcode = X86ISD::FAND;
24463 else if (N->getOpcode() == ISD::OR)
24464 FPOpcode = X86ISD::FOR;
24465 else if (N->getOpcode() == ISD::XOR)
24466 FPOpcode = X86ISD::FXOR;
24468 assert(FPOpcode != ISD::DELETED_NODE &&
24469 "Unexpected input node for FP logic conversion");
24471 EVT VT = N->getValueType(0);
24472 SDValue N0 = N->getOperand(0);
24473 SDValue N1 = N->getOperand(1);
24475 if (N0.getOpcode() == ISD::BITCAST && N1.getOpcode() == ISD::BITCAST &&
24476 ((Subtarget->hasSSE1() && VT == MVT::i32) ||
24477 (Subtarget->hasSSE2() && VT == MVT::i64))) {
24478 SDValue N00 = N0.getOperand(0);
24479 SDValue N10 = N1.getOperand(0);
24480 EVT N00Type = N00.getValueType();
24481 EVT N10Type = N10.getValueType();
24482 if (N00Type.isFloatingPoint() && N10Type.isFloatingPoint()) {
24483 SDValue FPLogic = DAG.getNode(FPOpcode, DL, N00Type, N00, N10);
24484 return DAG.getBitcast(VT, FPLogic);
24490 static SDValue PerformAndCombine(SDNode *N, SelectionDAG &DAG,
24491 TargetLowering::DAGCombinerInfo &DCI,
24492 const X86Subtarget *Subtarget) {
24493 if (DCI.isBeforeLegalizeOps())
24496 if (SDValue Zext = VectorZextCombine(N, DAG, DCI, Subtarget))
24499 if (SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget))
24502 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
24505 EVT VT = N->getValueType(0);
24506 SDValue N0 = N->getOperand(0);
24507 SDValue N1 = N->getOperand(1);
24510 // Create BEXTR instructions
24511 // BEXTR is ((X >> imm) & (2**size-1))
24512 if (VT == MVT::i32 || VT == MVT::i64) {
24513 // Check for BEXTR.
24514 if ((Subtarget->hasBMI() || Subtarget->hasTBM()) &&
24515 (N0.getOpcode() == ISD::SRA || N0.getOpcode() == ISD::SRL)) {
24516 ConstantSDNode *MaskNode = dyn_cast<ConstantSDNode>(N1);
24517 ConstantSDNode *ShiftNode = dyn_cast<ConstantSDNode>(N0.getOperand(1));
24518 if (MaskNode && ShiftNode) {
24519 uint64_t Mask = MaskNode->getZExtValue();
24520 uint64_t Shift = ShiftNode->getZExtValue();
24521 if (isMask_64(Mask)) {
24522 uint64_t MaskSize = countPopulation(Mask);
24523 if (Shift + MaskSize <= VT.getSizeInBits())
24524 return DAG.getNode(X86ISD::BEXTR, DL, VT, N0.getOperand(0),
24525 DAG.getConstant(Shift | (MaskSize << 8), DL,
24534 // Want to form ANDNP nodes:
24535 // 1) In the hopes of then easily combining them with OR and AND nodes
24536 // to form PBLEND/PSIGN.
24537 // 2) To match ANDN packed intrinsics
24538 if (VT != MVT::v2i64 && VT != MVT::v4i64)
24541 // Check LHS for vnot
24542 if (N0.getOpcode() == ISD::XOR &&
24543 //ISD::isBuildVectorAllOnes(N0.getOperand(1).getNode()))
24544 CanFoldXORWithAllOnes(N0.getOperand(1).getNode()))
24545 return DAG.getNode(X86ISD::ANDNP, DL, VT, N0.getOperand(0), N1);
24547 // Check RHS for vnot
24548 if (N1.getOpcode() == ISD::XOR &&
24549 //ISD::isBuildVectorAllOnes(N1.getOperand(1).getNode()))
24550 CanFoldXORWithAllOnes(N1.getOperand(1).getNode()))
24551 return DAG.getNode(X86ISD::ANDNP, DL, VT, N1.getOperand(0), N0);
24556 static SDValue PerformOrCombine(SDNode *N, SelectionDAG &DAG,
24557 TargetLowering::DAGCombinerInfo &DCI,
24558 const X86Subtarget *Subtarget) {
24559 if (DCI.isBeforeLegalizeOps())
24562 if (SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget))
24565 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
24568 SDValue N0 = N->getOperand(0);
24569 SDValue N1 = N->getOperand(1);
24570 EVT VT = N->getValueType(0);
24572 // look for psign/blend
24573 if (VT == MVT::v2i64 || VT == MVT::v4i64) {
24574 if (!Subtarget->hasSSSE3() ||
24575 (VT == MVT::v4i64 && !Subtarget->hasInt256()))
24578 // Canonicalize pandn to RHS
24579 if (N0.getOpcode() == X86ISD::ANDNP)
24581 // or (and (m, y), (pandn m, x))
24582 if (N0.getOpcode() == ISD::AND && N1.getOpcode() == X86ISD::ANDNP) {
24583 SDValue Mask = N1.getOperand(0);
24584 SDValue X = N1.getOperand(1);
24586 if (N0.getOperand(0) == Mask)
24587 Y = N0.getOperand(1);
24588 if (N0.getOperand(1) == Mask)
24589 Y = N0.getOperand(0);
24591 // Check to see if the mask appeared in both the AND and ANDNP and
24595 // Validate that X, Y, and Mask are BIT_CONVERTS, and see through them.
24596 // Look through mask bitcast.
24597 if (Mask.getOpcode() == ISD::BITCAST)
24598 Mask = Mask.getOperand(0);
24599 if (X.getOpcode() == ISD::BITCAST)
24600 X = X.getOperand(0);
24601 if (Y.getOpcode() == ISD::BITCAST)
24602 Y = Y.getOperand(0);
24604 EVT MaskVT = Mask.getValueType();
24606 // Validate that the Mask operand is a vector sra node.
24607 // FIXME: what to do for bytes, since there is a psignb/pblendvb, but
24608 // there is no psrai.b
24609 unsigned EltBits = MaskVT.getVectorElementType().getSizeInBits();
24610 unsigned SraAmt = ~0;
24611 if (Mask.getOpcode() == ISD::SRA) {
24612 if (auto *AmtBV = dyn_cast<BuildVectorSDNode>(Mask.getOperand(1)))
24613 if (auto *AmtConst = AmtBV->getConstantSplatNode())
24614 SraAmt = AmtConst->getZExtValue();
24615 } else if (Mask.getOpcode() == X86ISD::VSRAI) {
24616 SDValue SraC = Mask.getOperand(1);
24617 SraAmt = cast<ConstantSDNode>(SraC)->getZExtValue();
24619 if ((SraAmt + 1) != EltBits)
24624 // Now we know we at least have a plendvb with the mask val. See if
24625 // we can form a psignb/w/d.
24626 // psign = x.type == y.type == mask.type && y = sub(0, x);
24627 if (Y.getOpcode() == ISD::SUB && Y.getOperand(1) == X &&
24628 ISD::isBuildVectorAllZeros(Y.getOperand(0).getNode()) &&
24629 X.getValueType() == MaskVT && Y.getValueType() == MaskVT) {
24630 assert((EltBits == 8 || EltBits == 16 || EltBits == 32) &&
24631 "Unsupported VT for PSIGN");
24632 Mask = DAG.getNode(X86ISD::PSIGN, DL, MaskVT, X, Mask.getOperand(0));
24633 return DAG.getBitcast(VT, Mask);
24635 // PBLENDVB only available on SSE 4.1
24636 if (!Subtarget->hasSSE41())
24639 EVT BlendVT = (VT == MVT::v4i64) ? MVT::v32i8 : MVT::v16i8;
24641 X = DAG.getBitcast(BlendVT, X);
24642 Y = DAG.getBitcast(BlendVT, Y);
24643 Mask = DAG.getBitcast(BlendVT, Mask);
24644 Mask = DAG.getNode(ISD::VSELECT, DL, BlendVT, Mask, Y, X);
24645 return DAG.getBitcast(VT, Mask);
24649 if (VT != MVT::i16 && VT != MVT::i32 && VT != MVT::i64)
24652 // fold (or (x << c) | (y >> (64 - c))) ==> (shld64 x, y, c)
24653 bool OptForSize = DAG.getMachineFunction().getFunction()->optForSize();
24655 // SHLD/SHRD instructions have lower register pressure, but on some
24656 // platforms they have higher latency than the equivalent
24657 // series of shifts/or that would otherwise be generated.
24658 // Don't fold (or (x << c) | (y >> (64 - c))) if SHLD/SHRD instructions
24659 // have higher latencies and we are not optimizing for size.
24660 if (!OptForSize && Subtarget->isSHLDSlow())
24663 if (N0.getOpcode() == ISD::SRL && N1.getOpcode() == ISD::SHL)
24665 if (N0.getOpcode() != ISD::SHL || N1.getOpcode() != ISD::SRL)
24667 if (!N0.hasOneUse() || !N1.hasOneUse())
24670 SDValue ShAmt0 = N0.getOperand(1);
24671 if (ShAmt0.getValueType() != MVT::i8)
24673 SDValue ShAmt1 = N1.getOperand(1);
24674 if (ShAmt1.getValueType() != MVT::i8)
24676 if (ShAmt0.getOpcode() == ISD::TRUNCATE)
24677 ShAmt0 = ShAmt0.getOperand(0);
24678 if (ShAmt1.getOpcode() == ISD::TRUNCATE)
24679 ShAmt1 = ShAmt1.getOperand(0);
24682 unsigned Opc = X86ISD::SHLD;
24683 SDValue Op0 = N0.getOperand(0);
24684 SDValue Op1 = N1.getOperand(0);
24685 if (ShAmt0.getOpcode() == ISD::SUB) {
24686 Opc = X86ISD::SHRD;
24687 std::swap(Op0, Op1);
24688 std::swap(ShAmt0, ShAmt1);
24691 unsigned Bits = VT.getSizeInBits();
24692 if (ShAmt1.getOpcode() == ISD::SUB) {
24693 SDValue Sum = ShAmt1.getOperand(0);
24694 if (ConstantSDNode *SumC = dyn_cast<ConstantSDNode>(Sum)) {
24695 SDValue ShAmt1Op1 = ShAmt1.getOperand(1);
24696 if (ShAmt1Op1.getNode()->getOpcode() == ISD::TRUNCATE)
24697 ShAmt1Op1 = ShAmt1Op1.getOperand(0);
24698 if (SumC->getSExtValue() == Bits && ShAmt1Op1 == ShAmt0)
24699 return DAG.getNode(Opc, DL, VT,
24701 DAG.getNode(ISD::TRUNCATE, DL,
24704 } else if (ConstantSDNode *ShAmt1C = dyn_cast<ConstantSDNode>(ShAmt1)) {
24705 ConstantSDNode *ShAmt0C = dyn_cast<ConstantSDNode>(ShAmt0);
24707 ShAmt0C->getSExtValue() + ShAmt1C->getSExtValue() == Bits)
24708 return DAG.getNode(Opc, DL, VT,
24709 N0.getOperand(0), N1.getOperand(0),
24710 DAG.getNode(ISD::TRUNCATE, DL,
24717 // Generate NEG and CMOV for integer abs.
24718 static SDValue performIntegerAbsCombine(SDNode *N, SelectionDAG &DAG) {
24719 EVT VT = N->getValueType(0);
24721 // Since X86 does not have CMOV for 8-bit integer, we don't convert
24722 // 8-bit integer abs to NEG and CMOV.
24723 if (VT.isInteger() && VT.getSizeInBits() == 8)
24726 SDValue N0 = N->getOperand(0);
24727 SDValue N1 = N->getOperand(1);
24730 // Check pattern of XOR(ADD(X,Y), Y) where Y is SRA(X, size(X)-1)
24731 // and change it to SUB and CMOV.
24732 if (VT.isInteger() && N->getOpcode() == ISD::XOR &&
24733 N0.getOpcode() == ISD::ADD &&
24734 N0.getOperand(1) == N1 &&
24735 N1.getOpcode() == ISD::SRA &&
24736 N1.getOperand(0) == N0.getOperand(0))
24737 if (ConstantSDNode *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1)))
24738 if (Y1C->getAPIntValue() == VT.getSizeInBits()-1) {
24739 // Generate SUB & CMOV.
24740 SDValue Neg = DAG.getNode(X86ISD::SUB, DL, DAG.getVTList(VT, MVT::i32),
24741 DAG.getConstant(0, DL, VT), N0.getOperand(0));
24743 SDValue Ops[] = { N0.getOperand(0), Neg,
24744 DAG.getConstant(X86::COND_GE, DL, MVT::i8),
24745 SDValue(Neg.getNode(), 1) };
24746 return DAG.getNode(X86ISD::CMOV, DL, DAG.getVTList(VT, MVT::Glue), Ops);
24751 // Try to turn tests against the signbit in the form of:
24752 // XOR(TRUNCATE(SRL(X, size(X)-1)), 1)
24755 static SDValue foldXorTruncShiftIntoCmp(SDNode *N, SelectionDAG &DAG) {
24756 // This is only worth doing if the output type is i8.
24757 if (N->getValueType(0) != MVT::i8)
24760 SDValue N0 = N->getOperand(0);
24761 SDValue N1 = N->getOperand(1);
24763 // We should be performing an xor against a truncated shift.
24764 if (N0.getOpcode() != ISD::TRUNCATE || !N0.hasOneUse())
24767 // Make sure we are performing an xor against one.
24768 if (!isa<ConstantSDNode>(N1) || !cast<ConstantSDNode>(N1)->isOne())
24771 // SetCC on x86 zero extends so only act on this if it's a logical shift.
24772 SDValue Shift = N0.getOperand(0);
24773 if (Shift.getOpcode() != ISD::SRL || !Shift.hasOneUse())
24776 // Make sure we are truncating from one of i16, i32 or i64.
24777 EVT ShiftTy = Shift.getValueType();
24778 if (ShiftTy != MVT::i16 && ShiftTy != MVT::i32 && ShiftTy != MVT::i64)
24781 // Make sure the shift amount extracts the sign bit.
24782 if (!isa<ConstantSDNode>(Shift.getOperand(1)) ||
24783 Shift.getConstantOperandVal(1) != ShiftTy.getSizeInBits() - 1)
24786 // Create a greater-than comparison against -1.
24787 // N.B. Using SETGE against 0 works but we want a canonical looking
24788 // comparison, using SETGT matches up with what TranslateX86CC.
24790 SDValue ShiftOp = Shift.getOperand(0);
24791 EVT ShiftOpTy = ShiftOp.getValueType();
24792 SDValue Cond = DAG.getSetCC(DL, MVT::i8, ShiftOp,
24793 DAG.getConstant(-1, DL, ShiftOpTy), ISD::SETGT);
24797 static SDValue PerformXorCombine(SDNode *N, SelectionDAG &DAG,
24798 TargetLowering::DAGCombinerInfo &DCI,
24799 const X86Subtarget *Subtarget) {
24800 if (DCI.isBeforeLegalizeOps())
24803 if (SDValue RV = foldXorTruncShiftIntoCmp(N, DAG))
24806 if (Subtarget->hasCMov())
24807 if (SDValue RV = performIntegerAbsCombine(N, DAG))
24810 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
24816 /// PerformLOADCombine - Do target-specific dag combines on LOAD nodes.
24817 static SDValue PerformLOADCombine(SDNode *N, SelectionDAG &DAG,
24818 TargetLowering::DAGCombinerInfo &DCI,
24819 const X86Subtarget *Subtarget) {
24820 LoadSDNode *Ld = cast<LoadSDNode>(N);
24821 EVT RegVT = Ld->getValueType(0);
24822 EVT MemVT = Ld->getMemoryVT();
24824 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
24826 // For chips with slow 32-byte unaligned loads, break the 32-byte operation
24827 // into two 16-byte operations.
24828 ISD::LoadExtType Ext = Ld->getExtensionType();
24830 unsigned AddressSpace = Ld->getAddressSpace();
24831 unsigned Alignment = Ld->getAlignment();
24832 if (RegVT.is256BitVector() && !DCI.isBeforeLegalizeOps() &&
24833 Ext == ISD::NON_EXTLOAD &&
24834 TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), RegVT,
24835 AddressSpace, Alignment, &Fast) && !Fast) {
24836 unsigned NumElems = RegVT.getVectorNumElements();
24840 SDValue Ptr = Ld->getBasePtr();
24841 SDValue Increment =
24842 DAG.getConstant(16, dl, TLI.getPointerTy(DAG.getDataLayout()));
24844 EVT HalfVT = EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
24846 SDValue Load1 = DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr,
24847 Ld->getPointerInfo(), Ld->isVolatile(),
24848 Ld->isNonTemporal(), Ld->isInvariant(),
24850 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
24851 SDValue Load2 = DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr,
24852 Ld->getPointerInfo(), Ld->isVolatile(),
24853 Ld->isNonTemporal(), Ld->isInvariant(),
24854 std::min(16U, Alignment));
24855 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
24857 Load2.getValue(1));
24859 SDValue NewVec = DAG.getUNDEF(RegVT);
24860 NewVec = Insert128BitVector(NewVec, Load1, 0, DAG, dl);
24861 NewVec = Insert128BitVector(NewVec, Load2, NumElems/2, DAG, dl);
24862 return DCI.CombineTo(N, NewVec, TF, true);
24868 /// PerformMLOADCombine - Resolve extending loads
24869 static SDValue PerformMLOADCombine(SDNode *N, SelectionDAG &DAG,
24870 TargetLowering::DAGCombinerInfo &DCI,
24871 const X86Subtarget *Subtarget) {
24872 MaskedLoadSDNode *Mld = cast<MaskedLoadSDNode>(N);
24873 if (Mld->getExtensionType() != ISD::SEXTLOAD)
24876 EVT VT = Mld->getValueType(0);
24877 unsigned NumElems = VT.getVectorNumElements();
24878 EVT LdVT = Mld->getMemoryVT();
24881 assert(LdVT != VT && "Cannot extend to the same type");
24882 unsigned ToSz = VT.getVectorElementType().getSizeInBits();
24883 unsigned FromSz = LdVT.getVectorElementType().getSizeInBits();
24884 // From, To sizes and ElemCount must be pow of two
24885 assert (isPowerOf2_32(NumElems * FromSz * ToSz) &&
24886 "Unexpected size for extending masked load");
24888 unsigned SizeRatio = ToSz / FromSz;
24889 assert(SizeRatio * NumElems * FromSz == VT.getSizeInBits());
24891 // Create a type on which we perform the shuffle
24892 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
24893 LdVT.getScalarType(), NumElems*SizeRatio);
24894 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
24896 // Convert Src0 value
24897 SDValue WideSrc0 = DAG.getBitcast(WideVecVT, Mld->getSrc0());
24898 if (Mld->getSrc0().getOpcode() != ISD::UNDEF) {
24899 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
24900 for (unsigned i = 0; i != NumElems; ++i)
24901 ShuffleVec[i] = i * SizeRatio;
24903 // Can't shuffle using an illegal type.
24904 assert(DAG.getTargetLoweringInfo().isTypeLegal(WideVecVT) &&
24905 "WideVecVT should be legal");
24906 WideSrc0 = DAG.getVectorShuffle(WideVecVT, dl, WideSrc0,
24907 DAG.getUNDEF(WideVecVT), &ShuffleVec[0]);
24909 // Prepare the new mask
24911 SDValue Mask = Mld->getMask();
24912 if (Mask.getValueType() == VT) {
24913 // Mask and original value have the same type
24914 NewMask = DAG.getBitcast(WideVecVT, Mask);
24915 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
24916 for (unsigned i = 0; i != NumElems; ++i)
24917 ShuffleVec[i] = i * SizeRatio;
24918 for (unsigned i = NumElems; i != NumElems*SizeRatio; ++i)
24919 ShuffleVec[i] = NumElems*SizeRatio;
24920 NewMask = DAG.getVectorShuffle(WideVecVT, dl, NewMask,
24921 DAG.getConstant(0, dl, WideVecVT),
24925 assert(Mask.getValueType().getVectorElementType() == MVT::i1);
24926 unsigned WidenNumElts = NumElems*SizeRatio;
24927 unsigned MaskNumElts = VT.getVectorNumElements();
24928 EVT NewMaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
24931 unsigned NumConcat = WidenNumElts / MaskNumElts;
24932 SmallVector<SDValue, 16> Ops(NumConcat);
24933 SDValue ZeroVal = DAG.getConstant(0, dl, Mask.getValueType());
24935 for (unsigned i = 1; i != NumConcat; ++i)
24938 NewMask = DAG.getNode(ISD::CONCAT_VECTORS, dl, NewMaskVT, Ops);
24941 SDValue WideLd = DAG.getMaskedLoad(WideVecVT, dl, Mld->getChain(),
24942 Mld->getBasePtr(), NewMask, WideSrc0,
24943 Mld->getMemoryVT(), Mld->getMemOperand(),
24945 SDValue NewVec = DAG.getNode(X86ISD::VSEXT, dl, VT, WideLd);
24946 return DCI.CombineTo(N, NewVec, WideLd.getValue(1), true);
24948 /// PerformMSTORECombine - Resolve truncating stores
24949 static SDValue PerformMSTORECombine(SDNode *N, SelectionDAG &DAG,
24950 const X86Subtarget *Subtarget) {
24951 MaskedStoreSDNode *Mst = cast<MaskedStoreSDNode>(N);
24952 if (!Mst->isTruncatingStore())
24955 EVT VT = Mst->getValue().getValueType();
24956 unsigned NumElems = VT.getVectorNumElements();
24957 EVT StVT = Mst->getMemoryVT();
24960 assert(StVT != VT && "Cannot truncate to the same type");
24961 unsigned FromSz = VT.getVectorElementType().getSizeInBits();
24962 unsigned ToSz = StVT.getVectorElementType().getSizeInBits();
24964 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
24966 // The truncating store is legal in some cases. For example
24967 // vpmovqb, vpmovqw, vpmovqd, vpmovdb, vpmovdw
24968 // are designated for truncate store.
24969 // In this case we don't need any further transformations.
24970 if (TLI.isTruncStoreLegal(VT, StVT))
24973 // From, To sizes and ElemCount must be pow of two
24974 assert (isPowerOf2_32(NumElems * FromSz * ToSz) &&
24975 "Unexpected size for truncating masked store");
24976 // We are going to use the original vector elt for storing.
24977 // Accumulated smaller vector elements must be a multiple of the store size.
24978 assert (((NumElems * FromSz) % ToSz) == 0 &&
24979 "Unexpected ratio for truncating masked store");
24981 unsigned SizeRatio = FromSz / ToSz;
24982 assert(SizeRatio * NumElems * ToSz == VT.getSizeInBits());
24984 // Create a type on which we perform the shuffle
24985 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
24986 StVT.getScalarType(), NumElems*SizeRatio);
24988 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
24990 SDValue WideVec = DAG.getBitcast(WideVecVT, Mst->getValue());
24991 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
24992 for (unsigned i = 0; i != NumElems; ++i)
24993 ShuffleVec[i] = i * SizeRatio;
24995 // Can't shuffle using an illegal type.
24996 assert(DAG.getTargetLoweringInfo().isTypeLegal(WideVecVT) &&
24997 "WideVecVT should be legal");
24999 SDValue TruncatedVal = DAG.getVectorShuffle(WideVecVT, dl, WideVec,
25000 DAG.getUNDEF(WideVecVT),
25004 SDValue Mask = Mst->getMask();
25005 if (Mask.getValueType() == VT) {
25006 // Mask and original value have the same type
25007 NewMask = DAG.getBitcast(WideVecVT, Mask);
25008 for (unsigned i = 0; i != NumElems; ++i)
25009 ShuffleVec[i] = i * SizeRatio;
25010 for (unsigned i = NumElems; i != NumElems*SizeRatio; ++i)
25011 ShuffleVec[i] = NumElems*SizeRatio;
25012 NewMask = DAG.getVectorShuffle(WideVecVT, dl, NewMask,
25013 DAG.getConstant(0, dl, WideVecVT),
25017 assert(Mask.getValueType().getVectorElementType() == MVT::i1);
25018 unsigned WidenNumElts = NumElems*SizeRatio;
25019 unsigned MaskNumElts = VT.getVectorNumElements();
25020 EVT NewMaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
25023 unsigned NumConcat = WidenNumElts / MaskNumElts;
25024 SmallVector<SDValue, 16> Ops(NumConcat);
25025 SDValue ZeroVal = DAG.getConstant(0, dl, Mask.getValueType());
25027 for (unsigned i = 1; i != NumConcat; ++i)
25030 NewMask = DAG.getNode(ISD::CONCAT_VECTORS, dl, NewMaskVT, Ops);
25033 return DAG.getMaskedStore(Mst->getChain(), dl, TruncatedVal, Mst->getBasePtr(),
25034 NewMask, StVT, Mst->getMemOperand(), false);
25036 /// PerformSTORECombine - Do target-specific dag combines on STORE nodes.
25037 static SDValue PerformSTORECombine(SDNode *N, SelectionDAG &DAG,
25038 const X86Subtarget *Subtarget) {
25039 StoreSDNode *St = cast<StoreSDNode>(N);
25040 EVT VT = St->getValue().getValueType();
25041 EVT StVT = St->getMemoryVT();
25043 SDValue StoredVal = St->getOperand(1);
25044 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25046 // If we are saving a concatenation of two XMM registers and 32-byte stores
25047 // are slow, such as on Sandy Bridge, perform two 16-byte stores.
25049 unsigned AddressSpace = St->getAddressSpace();
25050 unsigned Alignment = St->getAlignment();
25051 if (VT.is256BitVector() && StVT == VT &&
25052 TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), VT,
25053 AddressSpace, Alignment, &Fast) && !Fast) {
25054 unsigned NumElems = VT.getVectorNumElements();
25058 SDValue Value0 = Extract128BitVector(StoredVal, 0, DAG, dl);
25059 SDValue Value1 = Extract128BitVector(StoredVal, NumElems/2, DAG, dl);
25062 DAG.getConstant(16, dl, TLI.getPointerTy(DAG.getDataLayout()));
25063 SDValue Ptr0 = St->getBasePtr();
25064 SDValue Ptr1 = DAG.getNode(ISD::ADD, dl, Ptr0.getValueType(), Ptr0, Stride);
25066 SDValue Ch0 = DAG.getStore(St->getChain(), dl, Value0, Ptr0,
25067 St->getPointerInfo(), St->isVolatile(),
25068 St->isNonTemporal(), Alignment);
25069 SDValue Ch1 = DAG.getStore(St->getChain(), dl, Value1, Ptr1,
25070 St->getPointerInfo(), St->isVolatile(),
25071 St->isNonTemporal(),
25072 std::min(16U, Alignment));
25073 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Ch0, Ch1);
25076 // Optimize trunc store (of multiple scalars) to shuffle and store.
25077 // First, pack all of the elements in one place. Next, store to memory
25078 // in fewer chunks.
25079 if (St->isTruncatingStore() && VT.isVector()) {
25080 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25081 unsigned NumElems = VT.getVectorNumElements();
25082 assert(StVT != VT && "Cannot truncate to the same type");
25083 unsigned FromSz = VT.getVectorElementType().getSizeInBits();
25084 unsigned ToSz = StVT.getVectorElementType().getSizeInBits();
25086 // The truncating store is legal in some cases. For example
25087 // vpmovqb, vpmovqw, vpmovqd, vpmovdb, vpmovdw
25088 // are designated for truncate store.
25089 // In this case we don't need any further transformations.
25090 if (TLI.isTruncStoreLegal(VT, StVT))
25093 // From, To sizes and ElemCount must be pow of two
25094 if (!isPowerOf2_32(NumElems * FromSz * ToSz)) return SDValue();
25095 // We are going to use the original vector elt for storing.
25096 // Accumulated smaller vector elements must be a multiple of the store size.
25097 if (0 != (NumElems * FromSz) % ToSz) return SDValue();
25099 unsigned SizeRatio = FromSz / ToSz;
25101 assert(SizeRatio * NumElems * ToSz == VT.getSizeInBits());
25103 // Create a type on which we perform the shuffle
25104 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
25105 StVT.getScalarType(), NumElems*SizeRatio);
25107 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
25109 SDValue WideVec = DAG.getBitcast(WideVecVT, St->getValue());
25110 SmallVector<int, 8> ShuffleVec(NumElems * SizeRatio, -1);
25111 for (unsigned i = 0; i != NumElems; ++i)
25112 ShuffleVec[i] = i * SizeRatio;
25114 // Can't shuffle using an illegal type.
25115 if (!TLI.isTypeLegal(WideVecVT))
25118 SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, WideVec,
25119 DAG.getUNDEF(WideVecVT),
25121 // At this point all of the data is stored at the bottom of the
25122 // register. We now need to save it to mem.
25124 // Find the largest store unit
25125 MVT StoreType = MVT::i8;
25126 for (MVT Tp : MVT::integer_valuetypes()) {
25127 if (TLI.isTypeLegal(Tp) && Tp.getSizeInBits() <= NumElems * ToSz)
25131 // On 32bit systems, we can't save 64bit integers. Try bitcasting to F64.
25132 if (TLI.isTypeLegal(MVT::f64) && StoreType.getSizeInBits() < 64 &&
25133 (64 <= NumElems * ToSz))
25134 StoreType = MVT::f64;
25136 // Bitcast the original vector into a vector of store-size units
25137 EVT StoreVecVT = EVT::getVectorVT(*DAG.getContext(),
25138 StoreType, VT.getSizeInBits()/StoreType.getSizeInBits());
25139 assert(StoreVecVT.getSizeInBits() == VT.getSizeInBits());
25140 SDValue ShuffWide = DAG.getBitcast(StoreVecVT, Shuff);
25141 SmallVector<SDValue, 8> Chains;
25142 SDValue Increment = DAG.getConstant(StoreType.getSizeInBits() / 8, dl,
25143 TLI.getPointerTy(DAG.getDataLayout()));
25144 SDValue Ptr = St->getBasePtr();
25146 // Perform one or more big stores into memory.
25147 for (unsigned i=0, e=(ToSz*NumElems)/StoreType.getSizeInBits(); i!=e; ++i) {
25148 SDValue SubVec = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
25149 StoreType, ShuffWide,
25150 DAG.getIntPtrConstant(i, dl));
25151 SDValue Ch = DAG.getStore(St->getChain(), dl, SubVec, Ptr,
25152 St->getPointerInfo(), St->isVolatile(),
25153 St->isNonTemporal(), St->getAlignment());
25154 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
25155 Chains.push_back(Ch);
25158 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
25161 // Turn load->store of MMX types into GPR load/stores. This avoids clobbering
25162 // the FP state in cases where an emms may be missing.
25163 // A preferable solution to the general problem is to figure out the right
25164 // places to insert EMMS. This qualifies as a quick hack.
25166 // Similarly, turn load->store of i64 into double load/stores in 32-bit mode.
25167 if (VT.getSizeInBits() != 64)
25170 const Function *F = DAG.getMachineFunction().getFunction();
25171 bool NoImplicitFloatOps = F->hasFnAttribute(Attribute::NoImplicitFloat);
25173 !Subtarget->useSoftFloat() && !NoImplicitFloatOps && Subtarget->hasSSE2();
25174 if ((VT.isVector() ||
25175 (VT == MVT::i64 && F64IsLegal && !Subtarget->is64Bit())) &&
25176 isa<LoadSDNode>(St->getValue()) &&
25177 !cast<LoadSDNode>(St->getValue())->isVolatile() &&
25178 St->getChain().hasOneUse() && !St->isVolatile()) {
25179 SDNode* LdVal = St->getValue().getNode();
25180 LoadSDNode *Ld = nullptr;
25181 int TokenFactorIndex = -1;
25182 SmallVector<SDValue, 8> Ops;
25183 SDNode* ChainVal = St->getChain().getNode();
25184 // Must be a store of a load. We currently handle two cases: the load
25185 // is a direct child, and it's under an intervening TokenFactor. It is
25186 // possible to dig deeper under nested TokenFactors.
25187 if (ChainVal == LdVal)
25188 Ld = cast<LoadSDNode>(St->getChain());
25189 else if (St->getValue().hasOneUse() &&
25190 ChainVal->getOpcode() == ISD::TokenFactor) {
25191 for (unsigned i = 0, e = ChainVal->getNumOperands(); i != e; ++i) {
25192 if (ChainVal->getOperand(i).getNode() == LdVal) {
25193 TokenFactorIndex = i;
25194 Ld = cast<LoadSDNode>(St->getValue());
25196 Ops.push_back(ChainVal->getOperand(i));
25200 if (!Ld || !ISD::isNormalLoad(Ld))
25203 // If this is not the MMX case, i.e. we are just turning i64 load/store
25204 // into f64 load/store, avoid the transformation if there are multiple
25205 // uses of the loaded value.
25206 if (!VT.isVector() && !Ld->hasNUsesOfValue(1, 0))
25211 // If we are a 64-bit capable x86, lower to a single movq load/store pair.
25212 // Otherwise, if it's legal to use f64 SSE instructions, use f64 load/store
25214 if (Subtarget->is64Bit() || F64IsLegal) {
25215 EVT LdVT = Subtarget->is64Bit() ? MVT::i64 : MVT::f64;
25216 SDValue NewLd = DAG.getLoad(LdVT, LdDL, Ld->getChain(), Ld->getBasePtr(),
25217 Ld->getPointerInfo(), Ld->isVolatile(),
25218 Ld->isNonTemporal(), Ld->isInvariant(),
25219 Ld->getAlignment());
25220 SDValue NewChain = NewLd.getValue(1);
25221 if (TokenFactorIndex != -1) {
25222 Ops.push_back(NewChain);
25223 NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, Ops);
25225 return DAG.getStore(NewChain, StDL, NewLd, St->getBasePtr(),
25226 St->getPointerInfo(),
25227 St->isVolatile(), St->isNonTemporal(),
25228 St->getAlignment());
25231 // Otherwise, lower to two pairs of 32-bit loads / stores.
25232 SDValue LoAddr = Ld->getBasePtr();
25233 SDValue HiAddr = DAG.getNode(ISD::ADD, LdDL, MVT::i32, LoAddr,
25234 DAG.getConstant(4, LdDL, MVT::i32));
25236 SDValue LoLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), LoAddr,
25237 Ld->getPointerInfo(),
25238 Ld->isVolatile(), Ld->isNonTemporal(),
25239 Ld->isInvariant(), Ld->getAlignment());
25240 SDValue HiLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), HiAddr,
25241 Ld->getPointerInfo().getWithOffset(4),
25242 Ld->isVolatile(), Ld->isNonTemporal(),
25244 MinAlign(Ld->getAlignment(), 4));
25246 SDValue NewChain = LoLd.getValue(1);
25247 if (TokenFactorIndex != -1) {
25248 Ops.push_back(LoLd);
25249 Ops.push_back(HiLd);
25250 NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, Ops);
25253 LoAddr = St->getBasePtr();
25254 HiAddr = DAG.getNode(ISD::ADD, StDL, MVT::i32, LoAddr,
25255 DAG.getConstant(4, StDL, MVT::i32));
25257 SDValue LoSt = DAG.getStore(NewChain, StDL, LoLd, LoAddr,
25258 St->getPointerInfo(),
25259 St->isVolatile(), St->isNonTemporal(),
25260 St->getAlignment());
25261 SDValue HiSt = DAG.getStore(NewChain, StDL, HiLd, HiAddr,
25262 St->getPointerInfo().getWithOffset(4),
25264 St->isNonTemporal(),
25265 MinAlign(St->getAlignment(), 4));
25266 return DAG.getNode(ISD::TokenFactor, StDL, MVT::Other, LoSt, HiSt);
25269 // This is similar to the above case, but here we handle a scalar 64-bit
25270 // integer store that is extracted from a vector on a 32-bit target.
25271 // If we have SSE2, then we can treat it like a floating-point double
25272 // to get past legalization. The execution dependencies fixup pass will
25273 // choose the optimal machine instruction for the store if this really is
25274 // an integer or v2f32 rather than an f64.
25275 if (VT == MVT::i64 && F64IsLegal && !Subtarget->is64Bit() &&
25276 St->getOperand(1).getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
25277 SDValue OldExtract = St->getOperand(1);
25278 SDValue ExtOp0 = OldExtract.getOperand(0);
25279 unsigned VecSize = ExtOp0.getValueSizeInBits();
25280 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), MVT::f64, VecSize / 64);
25281 SDValue BitCast = DAG.getBitcast(VecVT, ExtOp0);
25282 SDValue NewExtract = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
25283 BitCast, OldExtract.getOperand(1));
25284 return DAG.getStore(St->getChain(), dl, NewExtract, St->getBasePtr(),
25285 St->getPointerInfo(), St->isVolatile(),
25286 St->isNonTemporal(), St->getAlignment());
25292 /// Return 'true' if this vector operation is "horizontal"
25293 /// and return the operands for the horizontal operation in LHS and RHS. A
25294 /// horizontal operation performs the binary operation on successive elements
25295 /// of its first operand, then on successive elements of its second operand,
25296 /// returning the resulting values in a vector. For example, if
25297 /// A = < float a0, float a1, float a2, float a3 >
25299 /// B = < float b0, float b1, float b2, float b3 >
25300 /// then the result of doing a horizontal operation on A and B is
25301 /// A horizontal-op B = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >.
25302 /// In short, LHS and RHS are inspected to see if LHS op RHS is of the form
25303 /// A horizontal-op B, for some already available A and B, and if so then LHS is
25304 /// set to A, RHS to B, and the routine returns 'true'.
25305 /// Note that the binary operation should have the property that if one of the
25306 /// operands is UNDEF then the result is UNDEF.
25307 static bool isHorizontalBinOp(SDValue &LHS, SDValue &RHS, bool IsCommutative) {
25308 // Look for the following pattern: if
25309 // A = < float a0, float a1, float a2, float a3 >
25310 // B = < float b0, float b1, float b2, float b3 >
25312 // LHS = VECTOR_SHUFFLE A, B, <0, 2, 4, 6>
25313 // RHS = VECTOR_SHUFFLE A, B, <1, 3, 5, 7>
25314 // then LHS op RHS = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >
25315 // which is A horizontal-op B.
25317 // At least one of the operands should be a vector shuffle.
25318 if (LHS.getOpcode() != ISD::VECTOR_SHUFFLE &&
25319 RHS.getOpcode() != ISD::VECTOR_SHUFFLE)
25322 MVT VT = LHS.getSimpleValueType();
25324 assert((VT.is128BitVector() || VT.is256BitVector()) &&
25325 "Unsupported vector type for horizontal add/sub");
25327 // Handle 128 and 256-bit vector lengths. AVX defines horizontal add/sub to
25328 // operate independently on 128-bit lanes.
25329 unsigned NumElts = VT.getVectorNumElements();
25330 unsigned NumLanes = VT.getSizeInBits()/128;
25331 unsigned NumLaneElts = NumElts / NumLanes;
25332 assert((NumLaneElts % 2 == 0) &&
25333 "Vector type should have an even number of elements in each lane");
25334 unsigned HalfLaneElts = NumLaneElts/2;
25336 // View LHS in the form
25337 // LHS = VECTOR_SHUFFLE A, B, LMask
25338 // If LHS is not a shuffle then pretend it is the shuffle
25339 // LHS = VECTOR_SHUFFLE LHS, undef, <0, 1, ..., N-1>
25340 // NOTE: in what follows a default initialized SDValue represents an UNDEF of
25343 SmallVector<int, 16> LMask(NumElts);
25344 if (LHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
25345 if (LHS.getOperand(0).getOpcode() != ISD::UNDEF)
25346 A = LHS.getOperand(0);
25347 if (LHS.getOperand(1).getOpcode() != ISD::UNDEF)
25348 B = LHS.getOperand(1);
25349 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(LHS.getNode())->getMask();
25350 std::copy(Mask.begin(), Mask.end(), LMask.begin());
25352 if (LHS.getOpcode() != ISD::UNDEF)
25354 for (unsigned i = 0; i != NumElts; ++i)
25358 // Likewise, view RHS in the form
25359 // RHS = VECTOR_SHUFFLE C, D, RMask
25361 SmallVector<int, 16> RMask(NumElts);
25362 if (RHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
25363 if (RHS.getOperand(0).getOpcode() != ISD::UNDEF)
25364 C = RHS.getOperand(0);
25365 if (RHS.getOperand(1).getOpcode() != ISD::UNDEF)
25366 D = RHS.getOperand(1);
25367 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(RHS.getNode())->getMask();
25368 std::copy(Mask.begin(), Mask.end(), RMask.begin());
25370 if (RHS.getOpcode() != ISD::UNDEF)
25372 for (unsigned i = 0; i != NumElts; ++i)
25376 // Check that the shuffles are both shuffling the same vectors.
25377 if (!(A == C && B == D) && !(A == D && B == C))
25380 // If everything is UNDEF then bail out: it would be better to fold to UNDEF.
25381 if (!A.getNode() && !B.getNode())
25384 // If A and B occur in reverse order in RHS, then "swap" them (which means
25385 // rewriting the mask).
25387 ShuffleVectorSDNode::commuteMask(RMask);
25389 // At this point LHS and RHS are equivalent to
25390 // LHS = VECTOR_SHUFFLE A, B, LMask
25391 // RHS = VECTOR_SHUFFLE A, B, RMask
25392 // Check that the masks correspond to performing a horizontal operation.
25393 for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
25394 for (unsigned i = 0; i != NumLaneElts; ++i) {
25395 int LIdx = LMask[i+l], RIdx = RMask[i+l];
25397 // Ignore any UNDEF components.
25398 if (LIdx < 0 || RIdx < 0 ||
25399 (!A.getNode() && (LIdx < (int)NumElts || RIdx < (int)NumElts)) ||
25400 (!B.getNode() && (LIdx >= (int)NumElts || RIdx >= (int)NumElts)))
25403 // Check that successive elements are being operated on. If not, this is
25404 // not a horizontal operation.
25405 unsigned Src = (i/HalfLaneElts); // each lane is split between srcs
25406 int Index = 2*(i%HalfLaneElts) + NumElts*Src + l;
25407 if (!(LIdx == Index && RIdx == Index + 1) &&
25408 !(IsCommutative && LIdx == Index + 1 && RIdx == Index))
25413 LHS = A.getNode() ? A : B; // If A is 'UNDEF', use B for it.
25414 RHS = B.getNode() ? B : A; // If B is 'UNDEF', use A for it.
25418 /// Do target-specific dag combines on floating point adds.
25419 static SDValue PerformFADDCombine(SDNode *N, SelectionDAG &DAG,
25420 const X86Subtarget *Subtarget) {
25421 EVT VT = N->getValueType(0);
25422 SDValue LHS = N->getOperand(0);
25423 SDValue RHS = N->getOperand(1);
25425 // Try to synthesize horizontal adds from adds of shuffles.
25426 if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
25427 (Subtarget->hasFp256() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
25428 isHorizontalBinOp(LHS, RHS, true))
25429 return DAG.getNode(X86ISD::FHADD, SDLoc(N), VT, LHS, RHS);
25433 /// Do target-specific dag combines on floating point subs.
25434 static SDValue PerformFSUBCombine(SDNode *N, SelectionDAG &DAG,
25435 const X86Subtarget *Subtarget) {
25436 EVT VT = N->getValueType(0);
25437 SDValue LHS = N->getOperand(0);
25438 SDValue RHS = N->getOperand(1);
25440 // Try to synthesize horizontal subs from subs of shuffles.
25441 if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
25442 (Subtarget->hasFp256() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
25443 isHorizontalBinOp(LHS, RHS, false))
25444 return DAG.getNode(X86ISD::FHSUB, SDLoc(N), VT, LHS, RHS);
25448 /// Do target-specific dag combines on X86ISD::FOR and X86ISD::FXOR nodes.
25449 static SDValue PerformFORCombine(SDNode *N, SelectionDAG &DAG,
25450 const X86Subtarget *Subtarget) {
25451 assert(N->getOpcode() == X86ISD::FOR || N->getOpcode() == X86ISD::FXOR);
25453 // F[X]OR(0.0, x) -> x
25454 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
25455 if (C->getValueAPF().isPosZero())
25456 return N->getOperand(1);
25458 // F[X]OR(x, 0.0) -> x
25459 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
25460 if (C->getValueAPF().isPosZero())
25461 return N->getOperand(0);
25463 EVT VT = N->getValueType(0);
25464 if (VT.is512BitVector() && !Subtarget->hasDQI()) {
25466 MVT IntScalar = MVT::getIntegerVT(VT.getScalarSizeInBits());
25467 MVT IntVT = MVT::getVectorVT(IntScalar, VT.getVectorNumElements());
25469 SDValue Op0 = DAG.getNode(ISD::BITCAST, dl, IntVT, N->getOperand(0));
25470 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, IntVT, N->getOperand(1));
25471 unsigned IntOpcode = (N->getOpcode() == X86ISD::FOR) ? ISD::OR : ISD::XOR;
25472 SDValue IntOp = DAG.getNode(IntOpcode, dl, IntVT, Op0, Op1);
25473 return DAG.getNode(ISD::BITCAST, dl, VT, IntOp);
25478 /// Do target-specific dag combines on X86ISD::FMIN and X86ISD::FMAX nodes.
25479 static SDValue PerformFMinFMaxCombine(SDNode *N, SelectionDAG &DAG) {
25480 assert(N->getOpcode() == X86ISD::FMIN || N->getOpcode() == X86ISD::FMAX);
25482 // Only perform optimizations if UnsafeMath is used.
25483 if (!DAG.getTarget().Options.UnsafeFPMath)
25486 // If we run in unsafe-math mode, then convert the FMAX and FMIN nodes
25487 // into FMINC and FMAXC, which are Commutative operations.
25488 unsigned NewOp = 0;
25489 switch (N->getOpcode()) {
25490 default: llvm_unreachable("unknown opcode");
25491 case X86ISD::FMIN: NewOp = X86ISD::FMINC; break;
25492 case X86ISD::FMAX: NewOp = X86ISD::FMAXC; break;
25495 return DAG.getNode(NewOp, SDLoc(N), N->getValueType(0),
25496 N->getOperand(0), N->getOperand(1));
25499 /// Do target-specific dag combines on X86ISD::FAND nodes.
25500 static SDValue PerformFANDCombine(SDNode *N, SelectionDAG &DAG) {
25501 // FAND(0.0, x) -> 0.0
25502 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
25503 if (C->getValueAPF().isPosZero())
25504 return N->getOperand(0);
25506 // FAND(x, 0.0) -> 0.0
25507 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
25508 if (C->getValueAPF().isPosZero())
25509 return N->getOperand(1);
25514 /// Do target-specific dag combines on X86ISD::FANDN nodes
25515 static SDValue PerformFANDNCombine(SDNode *N, SelectionDAG &DAG) {
25516 // FANDN(0.0, x) -> x
25517 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
25518 if (C->getValueAPF().isPosZero())
25519 return N->getOperand(1);
25521 // FANDN(x, 0.0) -> 0.0
25522 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
25523 if (C->getValueAPF().isPosZero())
25524 return N->getOperand(1);
25529 static SDValue PerformBTCombine(SDNode *N,
25531 TargetLowering::DAGCombinerInfo &DCI) {
25532 // BT ignores high bits in the bit index operand.
25533 SDValue Op1 = N->getOperand(1);
25534 if (Op1.hasOneUse()) {
25535 unsigned BitWidth = Op1.getValueSizeInBits();
25536 APInt DemandedMask = APInt::getLowBitsSet(BitWidth, Log2_32(BitWidth));
25537 APInt KnownZero, KnownOne;
25538 TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
25539 !DCI.isBeforeLegalizeOps());
25540 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25541 if (TLO.ShrinkDemandedConstant(Op1, DemandedMask) ||
25542 TLI.SimplifyDemandedBits(Op1, DemandedMask, KnownZero, KnownOne, TLO))
25543 DCI.CommitTargetLoweringOpt(TLO);
25548 static SDValue PerformVZEXT_MOVLCombine(SDNode *N, SelectionDAG &DAG) {
25549 SDValue Op = N->getOperand(0);
25550 if (Op.getOpcode() == ISD::BITCAST)
25551 Op = Op.getOperand(0);
25552 EVT VT = N->getValueType(0), OpVT = Op.getValueType();
25553 if (Op.getOpcode() == X86ISD::VZEXT_LOAD &&
25554 VT.getVectorElementType().getSizeInBits() ==
25555 OpVT.getVectorElementType().getSizeInBits()) {
25556 return DAG.getNode(ISD::BITCAST, SDLoc(N), VT, Op);
25561 static SDValue PerformSIGN_EXTEND_INREGCombine(SDNode *N, SelectionDAG &DAG,
25562 const X86Subtarget *Subtarget) {
25563 EVT VT = N->getValueType(0);
25564 if (!VT.isVector())
25567 SDValue N0 = N->getOperand(0);
25568 SDValue N1 = N->getOperand(1);
25569 EVT ExtraVT = cast<VTSDNode>(N1)->getVT();
25572 // The SIGN_EXTEND_INREG to v4i64 is expensive operation on the
25573 // both SSE and AVX2 since there is no sign-extended shift right
25574 // operation on a vector with 64-bit elements.
25575 //(sext_in_reg (v4i64 anyext (v4i32 x )), ExtraVT) ->
25576 // (v4i64 sext (v4i32 sext_in_reg (v4i32 x , ExtraVT)))
25577 if (VT == MVT::v4i64 && (N0.getOpcode() == ISD::ANY_EXTEND ||
25578 N0.getOpcode() == ISD::SIGN_EXTEND)) {
25579 SDValue N00 = N0.getOperand(0);
25581 // EXTLOAD has a better solution on AVX2,
25582 // it may be replaced with X86ISD::VSEXT node.
25583 if (N00.getOpcode() == ISD::LOAD && Subtarget->hasInt256())
25584 if (!ISD::isNormalLoad(N00.getNode()))
25587 if (N00.getValueType() == MVT::v4i32 && ExtraVT.getSizeInBits() < 128) {
25588 SDValue Tmp = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, MVT::v4i32,
25590 return DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i64, Tmp);
25596 static SDValue PerformSExtCombine(SDNode *N, SelectionDAG &DAG,
25597 TargetLowering::DAGCombinerInfo &DCI,
25598 const X86Subtarget *Subtarget) {
25599 SDValue N0 = N->getOperand(0);
25600 EVT VT = N->getValueType(0);
25601 EVT SVT = VT.getScalarType();
25602 EVT InVT = N0.getValueType();
25603 EVT InSVT = InVT.getScalarType();
25606 // (i8,i32 sext (sdivrem (i8 x, i8 y)) ->
25607 // (i8,i32 (sdivrem_sext_hreg (i8 x, i8 y)
25608 // This exposes the sext to the sdivrem lowering, so that it directly extends
25609 // from AH (which we otherwise need to do contortions to access).
25610 if (N0.getOpcode() == ISD::SDIVREM && N0.getResNo() == 1 &&
25611 InVT == MVT::i8 && VT == MVT::i32) {
25612 SDVTList NodeTys = DAG.getVTList(MVT::i8, VT);
25613 SDValue R = DAG.getNode(X86ISD::SDIVREM8_SEXT_HREG, DL, NodeTys,
25614 N0.getOperand(0), N0.getOperand(1));
25615 DAG.ReplaceAllUsesOfValueWith(N0.getValue(0), R.getValue(0));
25616 return R.getValue(1);
25619 if (!DCI.isBeforeLegalizeOps()) {
25620 if (InVT == MVT::i1) {
25621 SDValue Zero = DAG.getConstant(0, DL, VT);
25623 DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), DL, VT);
25624 return DAG.getNode(ISD::SELECT, DL, VT, N0, AllOnes, Zero);
25629 if (VT.isVector() && Subtarget->hasSSE2()) {
25630 auto ExtendVecSize = [&DAG](SDLoc DL, SDValue N, unsigned Size) {
25631 EVT InVT = N.getValueType();
25632 EVT OutVT = EVT::getVectorVT(*DAG.getContext(), InVT.getScalarType(),
25633 Size / InVT.getScalarSizeInBits());
25634 SmallVector<SDValue, 8> Opnds(Size / InVT.getSizeInBits(),
25635 DAG.getUNDEF(InVT));
25637 return DAG.getNode(ISD::CONCAT_VECTORS, DL, OutVT, Opnds);
25640 // If target-size is less than 128-bits, extend to a type that would extend
25641 // to 128 bits, extend that and extract the original target vector.
25642 if (VT.getSizeInBits() < 128 && !(128 % VT.getSizeInBits()) &&
25643 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
25644 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
25645 unsigned Scale = 128 / VT.getSizeInBits();
25647 EVT::getVectorVT(*DAG.getContext(), SVT, 128 / SVT.getSizeInBits());
25648 SDValue Ex = ExtendVecSize(DL, N0, Scale * InVT.getSizeInBits());
25649 SDValue SExt = DAG.getNode(ISD::SIGN_EXTEND, DL, ExVT, Ex);
25650 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, SExt,
25651 DAG.getIntPtrConstant(0, DL));
25654 // If target-size is 128-bits, then convert to ISD::SIGN_EXTEND_VECTOR_INREG
25655 // which ensures lowering to X86ISD::VSEXT (pmovsx*).
25656 if (VT.getSizeInBits() == 128 &&
25657 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
25658 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
25659 SDValue ExOp = ExtendVecSize(DL, N0, 128);
25660 return DAG.getSignExtendVectorInReg(ExOp, DL, VT);
25663 // On pre-AVX2 targets, split into 128-bit nodes of
25664 // ISD::SIGN_EXTEND_VECTOR_INREG.
25665 if (!Subtarget->hasInt256() && !(VT.getSizeInBits() % 128) &&
25666 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
25667 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
25668 unsigned NumVecs = VT.getSizeInBits() / 128;
25669 unsigned NumSubElts = 128 / SVT.getSizeInBits();
25670 EVT SubVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumSubElts);
25671 EVT InSubVT = EVT::getVectorVT(*DAG.getContext(), InSVT, NumSubElts);
25673 SmallVector<SDValue, 8> Opnds;
25674 for (unsigned i = 0, Offset = 0; i != NumVecs;
25675 ++i, Offset += NumSubElts) {
25676 SDValue SrcVec = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InSubVT, N0,
25677 DAG.getIntPtrConstant(Offset, DL));
25678 SrcVec = ExtendVecSize(DL, SrcVec, 128);
25679 SrcVec = DAG.getSignExtendVectorInReg(SrcVec, DL, SubVT);
25680 Opnds.push_back(SrcVec);
25682 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, Opnds);
25686 if (!Subtarget->hasFp256())
25689 if (VT.isVector() && VT.getSizeInBits() == 256)
25690 if (SDValue R = WidenMaskArithmetic(N, DAG, DCI, Subtarget))
25696 static SDValue PerformFMACombine(SDNode *N, SelectionDAG &DAG,
25697 const X86Subtarget* Subtarget) {
25699 EVT VT = N->getValueType(0);
25701 // Let legalize expand this if it isn't a legal type yet.
25702 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
25705 EVT ScalarVT = VT.getScalarType();
25706 if ((ScalarVT != MVT::f32 && ScalarVT != MVT::f64) ||
25707 (!Subtarget->hasFMA() && !Subtarget->hasFMA4() &&
25708 !Subtarget->hasAVX512()))
25711 SDValue A = N->getOperand(0);
25712 SDValue B = N->getOperand(1);
25713 SDValue C = N->getOperand(2);
25715 bool NegA = (A.getOpcode() == ISD::FNEG);
25716 bool NegB = (B.getOpcode() == ISD::FNEG);
25717 bool NegC = (C.getOpcode() == ISD::FNEG);
25719 // Negative multiplication when NegA xor NegB
25720 bool NegMul = (NegA != NegB);
25722 A = A.getOperand(0);
25724 B = B.getOperand(0);
25726 C = C.getOperand(0);
25730 Opcode = (!NegC) ? X86ISD::FMADD : X86ISD::FMSUB;
25732 Opcode = (!NegC) ? X86ISD::FNMADD : X86ISD::FNMSUB;
25734 return DAG.getNode(Opcode, dl, VT, A, B, C);
25737 static SDValue PerformZExtCombine(SDNode *N, SelectionDAG &DAG,
25738 TargetLowering::DAGCombinerInfo &DCI,
25739 const X86Subtarget *Subtarget) {
25740 // (i32 zext (and (i8 x86isd::setcc_carry), 1)) ->
25741 // (and (i32 x86isd::setcc_carry), 1)
25742 // This eliminates the zext. This transformation is necessary because
25743 // ISD::SETCC is always legalized to i8.
25745 SDValue N0 = N->getOperand(0);
25746 EVT VT = N->getValueType(0);
25748 if (N0.getOpcode() == ISD::AND &&
25750 N0.getOperand(0).hasOneUse()) {
25751 SDValue N00 = N0.getOperand(0);
25752 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
25753 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
25754 if (!C || C->getZExtValue() != 1)
25756 return DAG.getNode(ISD::AND, dl, VT,
25757 DAG.getNode(X86ISD::SETCC_CARRY, dl, VT,
25758 N00.getOperand(0), N00.getOperand(1)),
25759 DAG.getConstant(1, dl, VT));
25763 if (N0.getOpcode() == ISD::TRUNCATE &&
25765 N0.getOperand(0).hasOneUse()) {
25766 SDValue N00 = N0.getOperand(0);
25767 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
25768 return DAG.getNode(ISD::AND, dl, VT,
25769 DAG.getNode(X86ISD::SETCC_CARRY, dl, VT,
25770 N00.getOperand(0), N00.getOperand(1)),
25771 DAG.getConstant(1, dl, VT));
25775 if (VT.is256BitVector())
25776 if (SDValue R = WidenMaskArithmetic(N, DAG, DCI, Subtarget))
25779 // (i8,i32 zext (udivrem (i8 x, i8 y)) ->
25780 // (i8,i32 (udivrem_zext_hreg (i8 x, i8 y)
25781 // This exposes the zext to the udivrem lowering, so that it directly extends
25782 // from AH (which we otherwise need to do contortions to access).
25783 if (N0.getOpcode() == ISD::UDIVREM &&
25784 N0.getResNo() == 1 && N0.getValueType() == MVT::i8 &&
25785 (VT == MVT::i32 || VT == MVT::i64)) {
25786 SDVTList NodeTys = DAG.getVTList(MVT::i8, VT);
25787 SDValue R = DAG.getNode(X86ISD::UDIVREM8_ZEXT_HREG, dl, NodeTys,
25788 N0.getOperand(0), N0.getOperand(1));
25789 DAG.ReplaceAllUsesOfValueWith(N0.getValue(0), R.getValue(0));
25790 return R.getValue(1);
25796 // Optimize x == -y --> x+y == 0
25797 // x != -y --> x+y != 0
25798 static SDValue PerformISDSETCCCombine(SDNode *N, SelectionDAG &DAG,
25799 const X86Subtarget* Subtarget) {
25800 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
25801 SDValue LHS = N->getOperand(0);
25802 SDValue RHS = N->getOperand(1);
25803 EVT VT = N->getValueType(0);
25806 if ((CC == ISD::SETNE || CC == ISD::SETEQ) && LHS.getOpcode() == ISD::SUB)
25807 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(LHS.getOperand(0)))
25808 if (C->getAPIntValue() == 0 && LHS.hasOneUse()) {
25809 SDValue addV = DAG.getNode(ISD::ADD, DL, LHS.getValueType(), RHS,
25810 LHS.getOperand(1));
25811 return DAG.getSetCC(DL, N->getValueType(0), addV,
25812 DAG.getConstant(0, DL, addV.getValueType()), CC);
25814 if ((CC == ISD::SETNE || CC == ISD::SETEQ) && RHS.getOpcode() == ISD::SUB)
25815 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS.getOperand(0)))
25816 if (C->getAPIntValue() == 0 && RHS.hasOneUse()) {
25817 SDValue addV = DAG.getNode(ISD::ADD, DL, RHS.getValueType(), LHS,
25818 RHS.getOperand(1));
25819 return DAG.getSetCC(DL, N->getValueType(0), addV,
25820 DAG.getConstant(0, DL, addV.getValueType()), CC);
25823 if (VT.getScalarType() == MVT::i1 &&
25824 (CC == ISD::SETNE || CC == ISD::SETEQ || ISD::isSignedIntSetCC(CC))) {
25826 (LHS.getOpcode() == ISD::SIGN_EXTEND) &&
25827 (LHS.getOperand(0).getValueType().getScalarType() == MVT::i1);
25828 bool IsVZero1 = ISD::isBuildVectorAllZeros(RHS.getNode());
25830 if (!IsSEXT0 || !IsVZero1) {
25831 // Swap the operands and update the condition code.
25832 std::swap(LHS, RHS);
25833 CC = ISD::getSetCCSwappedOperands(CC);
25835 IsSEXT0 = (LHS.getOpcode() == ISD::SIGN_EXTEND) &&
25836 (LHS.getOperand(0).getValueType().getScalarType() == MVT::i1);
25837 IsVZero1 = ISD::isBuildVectorAllZeros(RHS.getNode());
25840 if (IsSEXT0 && IsVZero1) {
25841 assert(VT == LHS.getOperand(0).getValueType() &&
25842 "Uexpected operand type");
25843 if (CC == ISD::SETGT)
25844 return DAG.getConstant(0, DL, VT);
25845 if (CC == ISD::SETLE)
25846 return DAG.getConstant(1, DL, VT);
25847 if (CC == ISD::SETEQ || CC == ISD::SETGE)
25848 return DAG.getNOT(DL, LHS.getOperand(0), VT);
25850 assert((CC == ISD::SETNE || CC == ISD::SETLT) &&
25851 "Unexpected condition code!");
25852 return LHS.getOperand(0);
25859 static SDValue NarrowVectorLoadToElement(LoadSDNode *Load, unsigned Index,
25860 SelectionDAG &DAG) {
25862 MVT VT = Load->getSimpleValueType(0);
25863 MVT EVT = VT.getVectorElementType();
25864 SDValue Addr = Load->getOperand(1);
25865 SDValue NewAddr = DAG.getNode(
25866 ISD::ADD, dl, Addr.getSimpleValueType(), Addr,
25867 DAG.getConstant(Index * EVT.getStoreSize(), dl,
25868 Addr.getSimpleValueType()));
25871 DAG.getLoad(EVT, dl, Load->getChain(), NewAddr,
25872 DAG.getMachineFunction().getMachineMemOperand(
25873 Load->getMemOperand(), 0, EVT.getStoreSize()));
25877 static SDValue PerformINSERTPSCombine(SDNode *N, SelectionDAG &DAG,
25878 const X86Subtarget *Subtarget) {
25880 MVT VT = N->getOperand(1)->getSimpleValueType(0);
25881 assert((VT == MVT::v4f32 || VT == MVT::v4i32) &&
25882 "X86insertps is only defined for v4x32");
25884 SDValue Ld = N->getOperand(1);
25885 if (MayFoldLoad(Ld)) {
25886 // Extract the countS bits from the immediate so we can get the proper
25887 // address when narrowing the vector load to a specific element.
25888 // When the second source op is a memory address, insertps doesn't use
25889 // countS and just gets an f32 from that address.
25890 unsigned DestIndex =
25891 cast<ConstantSDNode>(N->getOperand(2))->getZExtValue() >> 6;
25893 Ld = NarrowVectorLoadToElement(cast<LoadSDNode>(Ld), DestIndex, DAG);
25895 // Create this as a scalar to vector to match the instruction pattern.
25896 SDValue LoadScalarToVector = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Ld);
25897 // countS bits are ignored when loading from memory on insertps, which
25898 // means we don't need to explicitly set them to 0.
25899 return DAG.getNode(X86ISD::INSERTPS, dl, VT, N->getOperand(0),
25900 LoadScalarToVector, N->getOperand(2));
25905 static SDValue PerformBLENDICombine(SDNode *N, SelectionDAG &DAG) {
25906 SDValue V0 = N->getOperand(0);
25907 SDValue V1 = N->getOperand(1);
25909 EVT VT = N->getValueType(0);
25911 // Canonicalize a v2f64 blend with a mask of 2 by swapping the vector
25912 // operands and changing the mask to 1. This saves us a bunch of
25913 // pattern-matching possibilities related to scalar math ops in SSE/AVX.
25914 // x86InstrInfo knows how to commute this back after instruction selection
25915 // if it would help register allocation.
25917 // TODO: If optimizing for size or a processor that doesn't suffer from
25918 // partial register update stalls, this should be transformed into a MOVSD
25919 // instruction because a MOVSD is 1-2 bytes smaller than a BLENDPD.
25921 if (VT == MVT::v2f64)
25922 if (auto *Mask = dyn_cast<ConstantSDNode>(N->getOperand(2)))
25923 if (Mask->getZExtValue() == 2 && !isShuffleFoldableLoad(V0)) {
25924 SDValue NewMask = DAG.getConstant(1, DL, MVT::i8);
25925 return DAG.getNode(X86ISD::BLENDI, DL, VT, V1, V0, NewMask);
25931 // Helper function of PerformSETCCCombine. It is to materialize "setb reg"
25932 // as "sbb reg,reg", since it can be extended without zext and produces
25933 // an all-ones bit which is more useful than 0/1 in some cases.
25934 static SDValue MaterializeSETB(SDLoc DL, SDValue EFLAGS, SelectionDAG &DAG,
25937 return DAG.getNode(ISD::AND, DL, VT,
25938 DAG.getNode(X86ISD::SETCC_CARRY, DL, MVT::i8,
25939 DAG.getConstant(X86::COND_B, DL, MVT::i8),
25941 DAG.getConstant(1, DL, VT));
25942 assert (VT == MVT::i1 && "Unexpected type for SECCC node");
25943 return DAG.getNode(ISD::TRUNCATE, DL, MVT::i1,
25944 DAG.getNode(X86ISD::SETCC_CARRY, DL, MVT::i8,
25945 DAG.getConstant(X86::COND_B, DL, MVT::i8),
25949 // Optimize RES = X86ISD::SETCC CONDCODE, EFLAG_INPUT
25950 static SDValue PerformSETCCCombine(SDNode *N, SelectionDAG &DAG,
25951 TargetLowering::DAGCombinerInfo &DCI,
25952 const X86Subtarget *Subtarget) {
25954 X86::CondCode CC = X86::CondCode(N->getConstantOperandVal(0));
25955 SDValue EFLAGS = N->getOperand(1);
25957 if (CC == X86::COND_A) {
25958 // Try to convert COND_A into COND_B in an attempt to facilitate
25959 // materializing "setb reg".
25961 // Do not flip "e > c", where "c" is a constant, because Cmp instruction
25962 // cannot take an immediate as its first operand.
25964 if (EFLAGS.getOpcode() == X86ISD::SUB && EFLAGS.hasOneUse() &&
25965 EFLAGS.getValueType().isInteger() &&
25966 !isa<ConstantSDNode>(EFLAGS.getOperand(1))) {
25967 SDValue NewSub = DAG.getNode(X86ISD::SUB, SDLoc(EFLAGS),
25968 EFLAGS.getNode()->getVTList(),
25969 EFLAGS.getOperand(1), EFLAGS.getOperand(0));
25970 SDValue NewEFLAGS = SDValue(NewSub.getNode(), EFLAGS.getResNo());
25971 return MaterializeSETB(DL, NewEFLAGS, DAG, N->getSimpleValueType(0));
25975 // Materialize "setb reg" as "sbb reg,reg", since it can be extended without
25976 // a zext and produces an all-ones bit which is more useful than 0/1 in some
25978 if (CC == X86::COND_B)
25979 return MaterializeSETB(DL, EFLAGS, DAG, N->getSimpleValueType(0));
25981 if (SDValue Flags = checkBoolTestSetCCCombine(EFLAGS, CC)) {
25982 SDValue Cond = DAG.getConstant(CC, DL, MVT::i8);
25983 return DAG.getNode(X86ISD::SETCC, DL, N->getVTList(), Cond, Flags);
25989 // Optimize branch condition evaluation.
25991 static SDValue PerformBrCondCombine(SDNode *N, SelectionDAG &DAG,
25992 TargetLowering::DAGCombinerInfo &DCI,
25993 const X86Subtarget *Subtarget) {
25995 SDValue Chain = N->getOperand(0);
25996 SDValue Dest = N->getOperand(1);
25997 SDValue EFLAGS = N->getOperand(3);
25998 X86::CondCode CC = X86::CondCode(N->getConstantOperandVal(2));
26000 if (SDValue Flags = checkBoolTestSetCCCombine(EFLAGS, CC)) {
26001 SDValue Cond = DAG.getConstant(CC, DL, MVT::i8);
26002 return DAG.getNode(X86ISD::BRCOND, DL, N->getVTList(), Chain, Dest, Cond,
26009 static SDValue performVectorCompareAndMaskUnaryOpCombine(SDNode *N,
26010 SelectionDAG &DAG) {
26011 // Take advantage of vector comparisons producing 0 or -1 in each lane to
26012 // optimize away operation when it's from a constant.
26014 // The general transformation is:
26015 // UNARYOP(AND(VECTOR_CMP(x,y), constant)) -->
26016 // AND(VECTOR_CMP(x,y), constant2)
26017 // constant2 = UNARYOP(constant)
26019 // Early exit if this isn't a vector operation, the operand of the
26020 // unary operation isn't a bitwise AND, or if the sizes of the operations
26021 // aren't the same.
26022 EVT VT = N->getValueType(0);
26023 if (!VT.isVector() || N->getOperand(0)->getOpcode() != ISD::AND ||
26024 N->getOperand(0)->getOperand(0)->getOpcode() != ISD::SETCC ||
26025 VT.getSizeInBits() != N->getOperand(0)->getValueType(0).getSizeInBits())
26028 // Now check that the other operand of the AND is a constant. We could
26029 // make the transformation for non-constant splats as well, but it's unclear
26030 // that would be a benefit as it would not eliminate any operations, just
26031 // perform one more step in scalar code before moving to the vector unit.
26032 if (BuildVectorSDNode *BV =
26033 dyn_cast<BuildVectorSDNode>(N->getOperand(0)->getOperand(1))) {
26034 // Bail out if the vector isn't a constant.
26035 if (!BV->isConstant())
26038 // Everything checks out. Build up the new and improved node.
26040 EVT IntVT = BV->getValueType(0);
26041 // Create a new constant of the appropriate type for the transformed
26043 SDValue SourceConst = DAG.getNode(N->getOpcode(), DL, VT, SDValue(BV, 0));
26044 // The AND node needs bitcasts to/from an integer vector type around it.
26045 SDValue MaskConst = DAG.getBitcast(IntVT, SourceConst);
26046 SDValue NewAnd = DAG.getNode(ISD::AND, DL, IntVT,
26047 N->getOperand(0)->getOperand(0), MaskConst);
26048 SDValue Res = DAG.getBitcast(VT, NewAnd);
26055 static SDValue PerformUINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG,
26056 const X86Subtarget *Subtarget) {
26057 SDValue Op0 = N->getOperand(0);
26058 EVT VT = N->getValueType(0);
26059 EVT InVT = Op0.getValueType();
26060 EVT InSVT = InVT.getScalarType();
26061 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
26063 // UINT_TO_FP(vXi8) -> SINT_TO_FP(ZEXT(vXi8 to vXi32))
26064 // UINT_TO_FP(vXi16) -> SINT_TO_FP(ZEXT(vXi16 to vXi32))
26065 if (InVT.isVector() && (InSVT == MVT::i8 || InSVT == MVT::i16)) {
26067 EVT DstVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32,
26068 InVT.getVectorNumElements());
26069 SDValue P = DAG.getNode(ISD::ZERO_EXTEND, dl, DstVT, Op0);
26071 if (TLI.isOperationLegal(ISD::UINT_TO_FP, DstVT))
26072 return DAG.getNode(ISD::UINT_TO_FP, dl, VT, P);
26074 return DAG.getNode(ISD::SINT_TO_FP, dl, VT, P);
26080 static SDValue PerformSINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG,
26081 const X86Subtarget *Subtarget) {
26082 // First try to optimize away the conversion entirely when it's
26083 // conditionally from a constant. Vectors only.
26084 if (SDValue Res = performVectorCompareAndMaskUnaryOpCombine(N, DAG))
26087 // Now move on to more general possibilities.
26088 SDValue Op0 = N->getOperand(0);
26089 EVT VT = N->getValueType(0);
26090 EVT InVT = Op0.getValueType();
26091 EVT InSVT = InVT.getScalarType();
26093 // SINT_TO_FP(vXi8) -> SINT_TO_FP(SEXT(vXi8 to vXi32))
26094 // SINT_TO_FP(vXi16) -> SINT_TO_FP(SEXT(vXi16 to vXi32))
26095 if (InVT.isVector() && (InSVT == MVT::i8 || InSVT == MVT::i16)) {
26097 EVT DstVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32,
26098 InVT.getVectorNumElements());
26099 SDValue P = DAG.getNode(ISD::SIGN_EXTEND, dl, DstVT, Op0);
26100 return DAG.getNode(ISD::SINT_TO_FP, dl, VT, P);
26103 // Transform (SINT_TO_FP (i64 ...)) into an x87 operation if we have
26104 // a 32-bit target where SSE doesn't support i64->FP operations.
26105 if (Op0.getOpcode() == ISD::LOAD) {
26106 LoadSDNode *Ld = cast<LoadSDNode>(Op0.getNode());
26107 EVT LdVT = Ld->getValueType(0);
26109 // This transformation is not supported if the result type is f16
26110 if (VT == MVT::f16)
26113 if (!Ld->isVolatile() && !VT.isVector() &&
26114 ISD::isNON_EXTLoad(Op0.getNode()) && Op0.hasOneUse() &&
26115 !Subtarget->is64Bit() && LdVT == MVT::i64) {
26116 SDValue FILDChain = Subtarget->getTargetLowering()->BuildFILD(
26117 SDValue(N, 0), LdVT, Ld->getChain(), Op0, DAG);
26118 DAG.ReplaceAllUsesOfValueWith(Op0.getValue(1), FILDChain.getValue(1));
26125 // Optimize RES, EFLAGS = X86ISD::ADC LHS, RHS, EFLAGS
26126 static SDValue PerformADCCombine(SDNode *N, SelectionDAG &DAG,
26127 X86TargetLowering::DAGCombinerInfo &DCI) {
26128 // If the LHS and RHS of the ADC node are zero, then it can't overflow and
26129 // the result is either zero or one (depending on the input carry bit).
26130 // Strength reduce this down to a "set on carry" aka SETCC_CARRY&1.
26131 if (X86::isZeroNode(N->getOperand(0)) &&
26132 X86::isZeroNode(N->getOperand(1)) &&
26133 // We don't have a good way to replace an EFLAGS use, so only do this when
26135 SDValue(N, 1).use_empty()) {
26137 EVT VT = N->getValueType(0);
26138 SDValue CarryOut = DAG.getConstant(0, DL, N->getValueType(1));
26139 SDValue Res1 = DAG.getNode(ISD::AND, DL, VT,
26140 DAG.getNode(X86ISD::SETCC_CARRY, DL, VT,
26141 DAG.getConstant(X86::COND_B, DL,
26144 DAG.getConstant(1, DL, VT));
26145 return DCI.CombineTo(N, Res1, CarryOut);
26151 // fold (add Y, (sete X, 0)) -> adc 0, Y
26152 // (add Y, (setne X, 0)) -> sbb -1, Y
26153 // (sub (sete X, 0), Y) -> sbb 0, Y
26154 // (sub (setne X, 0), Y) -> adc -1, Y
26155 static SDValue OptimizeConditionalInDecrement(SDNode *N, SelectionDAG &DAG) {
26158 // Look through ZExts.
26159 SDValue Ext = N->getOperand(N->getOpcode() == ISD::SUB ? 1 : 0);
26160 if (Ext.getOpcode() != ISD::ZERO_EXTEND || !Ext.hasOneUse())
26163 SDValue SetCC = Ext.getOperand(0);
26164 if (SetCC.getOpcode() != X86ISD::SETCC || !SetCC.hasOneUse())
26167 X86::CondCode CC = (X86::CondCode)SetCC.getConstantOperandVal(0);
26168 if (CC != X86::COND_E && CC != X86::COND_NE)
26171 SDValue Cmp = SetCC.getOperand(1);
26172 if (Cmp.getOpcode() != X86ISD::CMP || !Cmp.hasOneUse() ||
26173 !X86::isZeroNode(Cmp.getOperand(1)) ||
26174 !Cmp.getOperand(0).getValueType().isInteger())
26177 SDValue CmpOp0 = Cmp.getOperand(0);
26178 SDValue NewCmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32, CmpOp0,
26179 DAG.getConstant(1, DL, CmpOp0.getValueType()));
26181 SDValue OtherVal = N->getOperand(N->getOpcode() == ISD::SUB ? 0 : 1);
26182 if (CC == X86::COND_NE)
26183 return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::ADC : X86ISD::SBB,
26184 DL, OtherVal.getValueType(), OtherVal,
26185 DAG.getConstant(-1ULL, DL, OtherVal.getValueType()),
26187 return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::SBB : X86ISD::ADC,
26188 DL, OtherVal.getValueType(), OtherVal,
26189 DAG.getConstant(0, DL, OtherVal.getValueType()), NewCmp);
26192 /// PerformADDCombine - Do target-specific dag combines on integer adds.
26193 static SDValue PerformAddCombine(SDNode *N, SelectionDAG &DAG,
26194 const X86Subtarget *Subtarget) {
26195 EVT VT = N->getValueType(0);
26196 SDValue Op0 = N->getOperand(0);
26197 SDValue Op1 = N->getOperand(1);
26199 // Try to synthesize horizontal adds from adds of shuffles.
26200 if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
26201 (Subtarget->hasInt256() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
26202 isHorizontalBinOp(Op0, Op1, true))
26203 return DAG.getNode(X86ISD::HADD, SDLoc(N), VT, Op0, Op1);
26205 return OptimizeConditionalInDecrement(N, DAG);
26208 static SDValue PerformSubCombine(SDNode *N, SelectionDAG &DAG,
26209 const X86Subtarget *Subtarget) {
26210 SDValue Op0 = N->getOperand(0);
26211 SDValue Op1 = N->getOperand(1);
26213 // X86 can't encode an immediate LHS of a sub. See if we can push the
26214 // negation into a preceding instruction.
26215 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op0)) {
26216 // If the RHS of the sub is a XOR with one use and a constant, invert the
26217 // immediate. Then add one to the LHS of the sub so we can turn
26218 // X-Y -> X+~Y+1, saving one register.
26219 if (Op1->hasOneUse() && Op1.getOpcode() == ISD::XOR &&
26220 isa<ConstantSDNode>(Op1.getOperand(1))) {
26221 APInt XorC = cast<ConstantSDNode>(Op1.getOperand(1))->getAPIntValue();
26222 EVT VT = Op0.getValueType();
26223 SDValue NewXor = DAG.getNode(ISD::XOR, SDLoc(Op1), VT,
26225 DAG.getConstant(~XorC, SDLoc(Op1), VT));
26226 return DAG.getNode(ISD::ADD, SDLoc(N), VT, NewXor,
26227 DAG.getConstant(C->getAPIntValue() + 1, SDLoc(N), VT));
26231 // Try to synthesize horizontal adds from adds of shuffles.
26232 EVT VT = N->getValueType(0);
26233 if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
26234 (Subtarget->hasInt256() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
26235 isHorizontalBinOp(Op0, Op1, true))
26236 return DAG.getNode(X86ISD::HSUB, SDLoc(N), VT, Op0, Op1);
26238 return OptimizeConditionalInDecrement(N, DAG);
26241 /// performVZEXTCombine - Performs build vector combines
26242 static SDValue performVZEXTCombine(SDNode *N, SelectionDAG &DAG,
26243 TargetLowering::DAGCombinerInfo &DCI,
26244 const X86Subtarget *Subtarget) {
26246 MVT VT = N->getSimpleValueType(0);
26247 SDValue Op = N->getOperand(0);
26248 MVT OpVT = Op.getSimpleValueType();
26249 MVT OpEltVT = OpVT.getVectorElementType();
26250 unsigned InputBits = OpEltVT.getSizeInBits() * VT.getVectorNumElements();
26252 // (vzext (bitcast (vzext (x)) -> (vzext x)
26254 while (V.getOpcode() == ISD::BITCAST)
26255 V = V.getOperand(0);
26257 if (V != Op && V.getOpcode() == X86ISD::VZEXT) {
26258 MVT InnerVT = V.getSimpleValueType();
26259 MVT InnerEltVT = InnerVT.getVectorElementType();
26261 // If the element sizes match exactly, we can just do one larger vzext. This
26262 // is always an exact type match as vzext operates on integer types.
26263 if (OpEltVT == InnerEltVT) {
26264 assert(OpVT == InnerVT && "Types must match for vzext!");
26265 return DAG.getNode(X86ISD::VZEXT, DL, VT, V.getOperand(0));
26268 // The only other way we can combine them is if only a single element of the
26269 // inner vzext is used in the input to the outer vzext.
26270 if (InnerEltVT.getSizeInBits() < InputBits)
26273 // In this case, the inner vzext is completely dead because we're going to
26274 // only look at bits inside of the low element. Just do the outer vzext on
26275 // a bitcast of the input to the inner.
26276 return DAG.getNode(X86ISD::VZEXT, DL, VT, DAG.getBitcast(OpVT, V));
26279 // Check if we can bypass extracting and re-inserting an element of an input
26280 // vector. Essentially:
26281 // (bitcast (sclr2vec (ext_vec_elt x))) -> (bitcast x)
26282 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR &&
26283 V.getOperand(0).getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
26284 V.getOperand(0).getSimpleValueType().getSizeInBits() == InputBits) {
26285 SDValue ExtractedV = V.getOperand(0);
26286 SDValue OrigV = ExtractedV.getOperand(0);
26287 if (auto *ExtractIdx = dyn_cast<ConstantSDNode>(ExtractedV.getOperand(1)))
26288 if (ExtractIdx->getZExtValue() == 0) {
26289 MVT OrigVT = OrigV.getSimpleValueType();
26290 // Extract a subvector if necessary...
26291 if (OrigVT.getSizeInBits() > OpVT.getSizeInBits()) {
26292 int Ratio = OrigVT.getSizeInBits() / OpVT.getSizeInBits();
26293 OrigVT = MVT::getVectorVT(OrigVT.getVectorElementType(),
26294 OrigVT.getVectorNumElements() / Ratio);
26295 OrigV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigVT, OrigV,
26296 DAG.getIntPtrConstant(0, DL));
26298 Op = DAG.getBitcast(OpVT, OrigV);
26299 return DAG.getNode(X86ISD::VZEXT, DL, VT, Op);
26306 SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
26307 DAGCombinerInfo &DCI) const {
26308 SelectionDAG &DAG = DCI.DAG;
26309 switch (N->getOpcode()) {
26311 case ISD::EXTRACT_VECTOR_ELT:
26312 return PerformEXTRACT_VECTOR_ELTCombine(N, DAG, DCI);
26315 case X86ISD::SHRUNKBLEND:
26316 return PerformSELECTCombine(N, DAG, DCI, Subtarget);
26317 case ISD::BITCAST: return PerformBITCASTCombine(N, DAG);
26318 case X86ISD::CMOV: return PerformCMOVCombine(N, DAG, DCI, Subtarget);
26319 case ISD::ADD: return PerformAddCombine(N, DAG, Subtarget);
26320 case ISD::SUB: return PerformSubCombine(N, DAG, Subtarget);
26321 case X86ISD::ADC: return PerformADCCombine(N, DAG, DCI);
26322 case ISD::MUL: return PerformMulCombine(N, DAG, DCI);
26325 case ISD::SRL: return PerformShiftCombine(N, DAG, DCI, Subtarget);
26326 case ISD::AND: return PerformAndCombine(N, DAG, DCI, Subtarget);
26327 case ISD::OR: return PerformOrCombine(N, DAG, DCI, Subtarget);
26328 case ISD::XOR: return PerformXorCombine(N, DAG, DCI, Subtarget);
26329 case ISD::LOAD: return PerformLOADCombine(N, DAG, DCI, Subtarget);
26330 case ISD::MLOAD: return PerformMLOADCombine(N, DAG, DCI, Subtarget);
26331 case ISD::STORE: return PerformSTORECombine(N, DAG, Subtarget);
26332 case ISD::MSTORE: return PerformMSTORECombine(N, DAG, Subtarget);
26333 case ISD::SINT_TO_FP: return PerformSINT_TO_FPCombine(N, DAG, Subtarget);
26334 case ISD::UINT_TO_FP: return PerformUINT_TO_FPCombine(N, DAG, Subtarget);
26335 case ISD::FADD: return PerformFADDCombine(N, DAG, Subtarget);
26336 case ISD::FSUB: return PerformFSUBCombine(N, DAG, Subtarget);
26338 case X86ISD::FOR: return PerformFORCombine(N, DAG, Subtarget);
26340 case X86ISD::FMAX: return PerformFMinFMaxCombine(N, DAG);
26341 case X86ISD::FAND: return PerformFANDCombine(N, DAG);
26342 case X86ISD::FANDN: return PerformFANDNCombine(N, DAG);
26343 case X86ISD::BT: return PerformBTCombine(N, DAG, DCI);
26344 case X86ISD::VZEXT_MOVL: return PerformVZEXT_MOVLCombine(N, DAG);
26345 case ISD::ANY_EXTEND:
26346 case ISD::ZERO_EXTEND: return PerformZExtCombine(N, DAG, DCI, Subtarget);
26347 case ISD::SIGN_EXTEND: return PerformSExtCombine(N, DAG, DCI, Subtarget);
26348 case ISD::SIGN_EXTEND_INREG:
26349 return PerformSIGN_EXTEND_INREGCombine(N, DAG, Subtarget);
26350 case ISD::SETCC: return PerformISDSETCCCombine(N, DAG, Subtarget);
26351 case X86ISD::SETCC: return PerformSETCCCombine(N, DAG, DCI, Subtarget);
26352 case X86ISD::BRCOND: return PerformBrCondCombine(N, DAG, DCI, Subtarget);
26353 case X86ISD::VZEXT: return performVZEXTCombine(N, DAG, DCI, Subtarget);
26354 case X86ISD::SHUFP: // Handle all target specific shuffles
26355 case X86ISD::PALIGNR:
26356 case X86ISD::UNPCKH:
26357 case X86ISD::UNPCKL:
26358 case X86ISD::MOVHLPS:
26359 case X86ISD::MOVLHPS:
26360 case X86ISD::PSHUFB:
26361 case X86ISD::PSHUFD:
26362 case X86ISD::PSHUFHW:
26363 case X86ISD::PSHUFLW:
26364 case X86ISD::MOVSS:
26365 case X86ISD::MOVSD:
26366 case X86ISD::VPERMILPI:
26367 case X86ISD::VPERM2X128:
26368 case ISD::VECTOR_SHUFFLE: return PerformShuffleCombine(N, DAG, DCI,Subtarget);
26369 case ISD::FMA: return PerformFMACombine(N, DAG, Subtarget);
26370 case X86ISD::INSERTPS: {
26371 if (getTargetMachine().getOptLevel() > CodeGenOpt::None)
26372 return PerformINSERTPSCombine(N, DAG, Subtarget);
26375 case X86ISD::BLENDI: return PerformBLENDICombine(N, DAG);
26381 /// isTypeDesirableForOp - Return true if the target has native support for
26382 /// the specified value type and it is 'desirable' to use the type for the
26383 /// given node type. e.g. On x86 i16 is legal, but undesirable since i16
26384 /// instruction encodings are longer and some i16 instructions are slow.
26385 bool X86TargetLowering::isTypeDesirableForOp(unsigned Opc, EVT VT) const {
26386 if (!isTypeLegal(VT))
26388 if (VT != MVT::i16)
26395 case ISD::SIGN_EXTEND:
26396 case ISD::ZERO_EXTEND:
26397 case ISD::ANY_EXTEND:
26410 /// IsDesirableToPromoteOp - This method query the target whether it is
26411 /// beneficial for dag combiner to promote the specified node. If true, it
26412 /// should return the desired promotion type by reference.
26413 bool X86TargetLowering::IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const {
26414 EVT VT = Op.getValueType();
26415 if (VT != MVT::i16)
26418 bool Promote = false;
26419 bool Commute = false;
26420 switch (Op.getOpcode()) {
26423 LoadSDNode *LD = cast<LoadSDNode>(Op);
26424 // If the non-extending load has a single use and it's not live out, then it
26425 // might be folded.
26426 if (LD->getExtensionType() == ISD::NON_EXTLOAD /*&&
26427 Op.hasOneUse()*/) {
26428 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
26429 UE = Op.getNode()->use_end(); UI != UE; ++UI) {
26430 // The only case where we'd want to promote LOAD (rather then it being
26431 // promoted as an operand is when it's only use is liveout.
26432 if (UI->getOpcode() != ISD::CopyToReg)
26439 case ISD::SIGN_EXTEND:
26440 case ISD::ZERO_EXTEND:
26441 case ISD::ANY_EXTEND:
26446 SDValue N0 = Op.getOperand(0);
26447 // Look out for (store (shl (load), x)).
26448 if (MayFoldLoad(N0) && MayFoldIntoStore(Op))
26461 SDValue N0 = Op.getOperand(0);
26462 SDValue N1 = Op.getOperand(1);
26463 if (!Commute && MayFoldLoad(N1))
26465 // Avoid disabling potential load folding opportunities.
26466 if (MayFoldLoad(N0) && (!isa<ConstantSDNode>(N1) || MayFoldIntoStore(Op)))
26468 if (MayFoldLoad(N1) && (!isa<ConstantSDNode>(N0) || MayFoldIntoStore(Op)))
26478 //===----------------------------------------------------------------------===//
26479 // X86 Inline Assembly Support
26480 //===----------------------------------------------------------------------===//
26482 // Helper to match a string separated by whitespace.
26483 static bool matchAsm(StringRef S, ArrayRef<const char *> Pieces) {
26484 S = S.substr(S.find_first_not_of(" \t")); // Skip leading whitespace.
26486 for (StringRef Piece : Pieces) {
26487 if (!S.startswith(Piece)) // Check if the piece matches.
26490 S = S.substr(Piece.size());
26491 StringRef::size_type Pos = S.find_first_not_of(" \t");
26492 if (Pos == 0) // We matched a prefix.
26501 static bool clobbersFlagRegisters(const SmallVector<StringRef, 4> &AsmPieces) {
26503 if (AsmPieces.size() == 3 || AsmPieces.size() == 4) {
26504 if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{cc}") &&
26505 std::count(AsmPieces.begin(), AsmPieces.end(), "~{flags}") &&
26506 std::count(AsmPieces.begin(), AsmPieces.end(), "~{fpsr}")) {
26508 if (AsmPieces.size() == 3)
26510 else if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{dirflag}"))
26517 bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
26518 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
26520 std::string AsmStr = IA->getAsmString();
26522 IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
26523 if (!Ty || Ty->getBitWidth() % 16 != 0)
26526 // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
26527 SmallVector<StringRef, 4> AsmPieces;
26528 SplitString(AsmStr, AsmPieces, ";\n");
26530 switch (AsmPieces.size()) {
26531 default: return false;
26533 // FIXME: this should verify that we are targeting a 486 or better. If not,
26534 // we will turn this bswap into something that will be lowered to logical
26535 // ops instead of emitting the bswap asm. For now, we don't support 486 or
26536 // lower so don't worry about this.
26538 if (matchAsm(AsmPieces[0], {"bswap", "$0"}) ||
26539 matchAsm(AsmPieces[0], {"bswapl", "$0"}) ||
26540 matchAsm(AsmPieces[0], {"bswapq", "$0"}) ||
26541 matchAsm(AsmPieces[0], {"bswap", "${0:q}"}) ||
26542 matchAsm(AsmPieces[0], {"bswapl", "${0:q}"}) ||
26543 matchAsm(AsmPieces[0], {"bswapq", "${0:q}"})) {
26544 // No need to check constraints, nothing other than the equivalent of
26545 // "=r,0" would be valid here.
26546 return IntrinsicLowering::LowerToByteSwap(CI);
26549 // rorw $$8, ${0:w} --> llvm.bswap.i16
26550 if (CI->getType()->isIntegerTy(16) &&
26551 IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
26552 (matchAsm(AsmPieces[0], {"rorw", "$$8,", "${0:w}"}) ||
26553 matchAsm(AsmPieces[0], {"rolw", "$$8,", "${0:w}"}))) {
26555 StringRef ConstraintsStr = IA->getConstraintString();
26556 SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
26557 array_pod_sort(AsmPieces.begin(), AsmPieces.end());
26558 if (clobbersFlagRegisters(AsmPieces))
26559 return IntrinsicLowering::LowerToByteSwap(CI);
26563 if (CI->getType()->isIntegerTy(32) &&
26564 IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
26565 matchAsm(AsmPieces[0], {"rorw", "$$8,", "${0:w}"}) &&
26566 matchAsm(AsmPieces[1], {"rorl", "$$16,", "$0"}) &&
26567 matchAsm(AsmPieces[2], {"rorw", "$$8,", "${0:w}"})) {
26569 StringRef ConstraintsStr = IA->getConstraintString();
26570 SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
26571 array_pod_sort(AsmPieces.begin(), AsmPieces.end());
26572 if (clobbersFlagRegisters(AsmPieces))
26573 return IntrinsicLowering::LowerToByteSwap(CI);
26576 if (CI->getType()->isIntegerTy(64)) {
26577 InlineAsm::ConstraintInfoVector Constraints = IA->ParseConstraints();
26578 if (Constraints.size() >= 2 &&
26579 Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
26580 Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
26581 // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
26582 if (matchAsm(AsmPieces[0], {"bswap", "%eax"}) &&
26583 matchAsm(AsmPieces[1], {"bswap", "%edx"}) &&
26584 matchAsm(AsmPieces[2], {"xchgl", "%eax,", "%edx"}))
26585 return IntrinsicLowering::LowerToByteSwap(CI);
26593 /// getConstraintType - Given a constraint letter, return the type of
26594 /// constraint it is for this target.
26595 X86TargetLowering::ConstraintType
26596 X86TargetLowering::getConstraintType(StringRef Constraint) const {
26597 if (Constraint.size() == 1) {
26598 switch (Constraint[0]) {
26609 return C_RegisterClass;
26633 return TargetLowering::getConstraintType(Constraint);
26636 /// Examine constraint type and operand type and determine a weight value.
26637 /// This object must already have been set up with the operand type
26638 /// and the current alternative constraint selected.
26639 TargetLowering::ConstraintWeight
26640 X86TargetLowering::getSingleConstraintMatchWeight(
26641 AsmOperandInfo &info, const char *constraint) const {
26642 ConstraintWeight weight = CW_Invalid;
26643 Value *CallOperandVal = info.CallOperandVal;
26644 // If we don't have a value, we can't do a match,
26645 // but allow it at the lowest weight.
26646 if (!CallOperandVal)
26648 Type *type = CallOperandVal->getType();
26649 // Look at the constraint type.
26650 switch (*constraint) {
26652 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
26663 if (CallOperandVal->getType()->isIntegerTy())
26664 weight = CW_SpecificReg;
26669 if (type->isFloatingPointTy())
26670 weight = CW_SpecificReg;
26673 if (type->isX86_MMXTy() && Subtarget->hasMMX())
26674 weight = CW_SpecificReg;
26678 if (((type->getPrimitiveSizeInBits() == 128) && Subtarget->hasSSE1()) ||
26679 ((type->getPrimitiveSizeInBits() == 256) && Subtarget->hasFp256()))
26680 weight = CW_Register;
26683 if (ConstantInt *C = dyn_cast<ConstantInt>(info.CallOperandVal)) {
26684 if (C->getZExtValue() <= 31)
26685 weight = CW_Constant;
26689 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26690 if (C->getZExtValue() <= 63)
26691 weight = CW_Constant;
26695 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26696 if ((C->getSExtValue() >= -0x80) && (C->getSExtValue() <= 0x7f))
26697 weight = CW_Constant;
26701 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26702 if ((C->getZExtValue() == 0xff) || (C->getZExtValue() == 0xffff))
26703 weight = CW_Constant;
26707 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26708 if (C->getZExtValue() <= 3)
26709 weight = CW_Constant;
26713 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26714 if (C->getZExtValue() <= 0xff)
26715 weight = CW_Constant;
26720 if (isa<ConstantFP>(CallOperandVal)) {
26721 weight = CW_Constant;
26725 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26726 if ((C->getSExtValue() >= -0x80000000LL) &&
26727 (C->getSExtValue() <= 0x7fffffffLL))
26728 weight = CW_Constant;
26732 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
26733 if (C->getZExtValue() <= 0xffffffff)
26734 weight = CW_Constant;
26741 /// LowerXConstraint - try to replace an X constraint, which matches anything,
26742 /// with another that has more specific requirements based on the type of the
26743 /// corresponding operand.
26744 const char *X86TargetLowering::
26745 LowerXConstraint(EVT ConstraintVT) const {
26746 // FP X constraints get lowered to SSE1/2 registers if available, otherwise
26747 // 'f' like normal targets.
26748 if (ConstraintVT.isFloatingPoint()) {
26749 if (Subtarget->hasSSE2())
26751 if (Subtarget->hasSSE1())
26755 return TargetLowering::LowerXConstraint(ConstraintVT);
26758 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
26759 /// vector. If it is invalid, don't add anything to Ops.
26760 void X86TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
26761 std::string &Constraint,
26762 std::vector<SDValue>&Ops,
26763 SelectionDAG &DAG) const {
26766 // Only support length 1 constraints for now.
26767 if (Constraint.length() > 1) return;
26769 char ConstraintLetter = Constraint[0];
26770 switch (ConstraintLetter) {
26773 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26774 if (C->getZExtValue() <= 31) {
26775 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26776 Op.getValueType());
26782 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26783 if (C->getZExtValue() <= 63) {
26784 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26785 Op.getValueType());
26791 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26792 if (isInt<8>(C->getSExtValue())) {
26793 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26794 Op.getValueType());
26800 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26801 if (C->getZExtValue() == 0xff || C->getZExtValue() == 0xffff ||
26802 (Subtarget->is64Bit() && C->getZExtValue() == 0xffffffff)) {
26803 Result = DAG.getTargetConstant(C->getSExtValue(), SDLoc(Op),
26804 Op.getValueType());
26810 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26811 if (C->getZExtValue() <= 3) {
26812 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26813 Op.getValueType());
26819 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26820 if (C->getZExtValue() <= 255) {
26821 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26822 Op.getValueType());
26828 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26829 if (C->getZExtValue() <= 127) {
26830 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26831 Op.getValueType());
26837 // 32-bit signed value
26838 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26839 if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
26840 C->getSExtValue())) {
26841 // Widen to 64 bits here to get it sign extended.
26842 Result = DAG.getTargetConstant(C->getSExtValue(), SDLoc(Op), MVT::i64);
26845 // FIXME gcc accepts some relocatable values here too, but only in certain
26846 // memory models; it's complicated.
26851 // 32-bit unsigned value
26852 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
26853 if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
26854 C->getZExtValue())) {
26855 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
26856 Op.getValueType());
26860 // FIXME gcc accepts some relocatable values here too, but only in certain
26861 // memory models; it's complicated.
26865 // Literal immediates are always ok.
26866 if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op)) {
26867 // Widen to 64 bits here to get it sign extended.
26868 Result = DAG.getTargetConstant(CST->getSExtValue(), SDLoc(Op), MVT::i64);
26872 // In any sort of PIC mode addresses need to be computed at runtime by
26873 // adding in a register or some sort of table lookup. These can't
26874 // be used as immediates.
26875 if (Subtarget->isPICStyleGOT() || Subtarget->isPICStyleStubPIC())
26878 // If we are in non-pic codegen mode, we allow the address of a global (with
26879 // an optional displacement) to be used with 'i'.
26880 GlobalAddressSDNode *GA = nullptr;
26881 int64_t Offset = 0;
26883 // Match either (GA), (GA+C), (GA+C1+C2), etc.
26885 if ((GA = dyn_cast<GlobalAddressSDNode>(Op))) {
26886 Offset += GA->getOffset();
26888 } else if (Op.getOpcode() == ISD::ADD) {
26889 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
26890 Offset += C->getZExtValue();
26891 Op = Op.getOperand(0);
26894 } else if (Op.getOpcode() == ISD::SUB) {
26895 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
26896 Offset += -C->getZExtValue();
26897 Op = Op.getOperand(0);
26902 // Otherwise, this isn't something we can handle, reject it.
26906 const GlobalValue *GV = GA->getGlobal();
26907 // If we require an extra load to get this address, as in PIC mode, we
26908 // can't accept it.
26909 if (isGlobalStubReference(
26910 Subtarget->ClassifyGlobalReference(GV, DAG.getTarget())))
26913 Result = DAG.getTargetGlobalAddress(GV, SDLoc(Op),
26914 GA->getValueType(0), Offset);
26919 if (Result.getNode()) {
26920 Ops.push_back(Result);
26923 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
26926 std::pair<unsigned, const TargetRegisterClass *>
26927 X86TargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
26928 StringRef Constraint,
26930 // First, see if this is a constraint that directly corresponds to an LLVM
26932 if (Constraint.size() == 1) {
26933 // GCC Constraint Letters
26934 switch (Constraint[0]) {
26936 // TODO: Slight differences here in allocation order and leaving
26937 // RIP in the class. Do they matter any more here than they do
26938 // in the normal allocation?
26939 case 'q': // GENERAL_REGS in 64-bit mode, Q_REGS in 32-bit mode.
26940 if (Subtarget->is64Bit()) {
26941 if (VT == MVT::i32 || VT == MVT::f32)
26942 return std::make_pair(0U, &X86::GR32RegClass);
26943 if (VT == MVT::i16)
26944 return std::make_pair(0U, &X86::GR16RegClass);
26945 if (VT == MVT::i8 || VT == MVT::i1)
26946 return std::make_pair(0U, &X86::GR8RegClass);
26947 if (VT == MVT::i64 || VT == MVT::f64)
26948 return std::make_pair(0U, &X86::GR64RegClass);
26951 // 32-bit fallthrough
26952 case 'Q': // Q_REGS
26953 if (VT == MVT::i32 || VT == MVT::f32)
26954 return std::make_pair(0U, &X86::GR32_ABCDRegClass);
26955 if (VT == MVT::i16)
26956 return std::make_pair(0U, &X86::GR16_ABCDRegClass);
26957 if (VT == MVT::i8 || VT == MVT::i1)
26958 return std::make_pair(0U, &X86::GR8_ABCD_LRegClass);
26959 if (VT == MVT::i64)
26960 return std::make_pair(0U, &X86::GR64_ABCDRegClass);
26962 case 'r': // GENERAL_REGS
26963 case 'l': // INDEX_REGS
26964 if (VT == MVT::i8 || VT == MVT::i1)
26965 return std::make_pair(0U, &X86::GR8RegClass);
26966 if (VT == MVT::i16)
26967 return std::make_pair(0U, &X86::GR16RegClass);
26968 if (VT == MVT::i32 || VT == MVT::f32 || !Subtarget->is64Bit())
26969 return std::make_pair(0U, &X86::GR32RegClass);
26970 return std::make_pair(0U, &X86::GR64RegClass);
26971 case 'R': // LEGACY_REGS
26972 if (VT == MVT::i8 || VT == MVT::i1)
26973 return std::make_pair(0U, &X86::GR8_NOREXRegClass);
26974 if (VT == MVT::i16)
26975 return std::make_pair(0U, &X86::GR16_NOREXRegClass);
26976 if (VT == MVT::i32 || !Subtarget->is64Bit())
26977 return std::make_pair(0U, &X86::GR32_NOREXRegClass);
26978 return std::make_pair(0U, &X86::GR64_NOREXRegClass);
26979 case 'f': // FP Stack registers.
26980 // If SSE is enabled for this VT, use f80 to ensure the isel moves the
26981 // value to the correct fpstack register class.
26982 if (VT == MVT::f32 && !isScalarFPTypeInSSEReg(VT))
26983 return std::make_pair(0U, &X86::RFP32RegClass);
26984 if (VT == MVT::f64 && !isScalarFPTypeInSSEReg(VT))
26985 return std::make_pair(0U, &X86::RFP64RegClass);
26986 return std::make_pair(0U, &X86::RFP80RegClass);
26987 case 'y': // MMX_REGS if MMX allowed.
26988 if (!Subtarget->hasMMX()) break;
26989 return std::make_pair(0U, &X86::VR64RegClass);
26990 case 'Y': // SSE_REGS if SSE2 allowed
26991 if (!Subtarget->hasSSE2()) break;
26993 case 'x': // SSE_REGS if SSE1 allowed or AVX_REGS if AVX allowed
26994 if (!Subtarget->hasSSE1()) break;
26996 switch (VT.SimpleTy) {
26998 // Scalar SSE types.
27001 return std::make_pair(0U, &X86::FR32RegClass);
27004 return std::make_pair(0U, &X86::FR64RegClass);
27012 return std::make_pair(0U, &X86::VR128RegClass);
27020 return std::make_pair(0U, &X86::VR256RegClass);
27025 return std::make_pair(0U, &X86::VR512RegClass);
27031 // Use the default implementation in TargetLowering to convert the register
27032 // constraint into a member of a register class.
27033 std::pair<unsigned, const TargetRegisterClass*> Res;
27034 Res = TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
27036 // Not found as a standard register?
27038 // Map st(0) -> st(7) -> ST0
27039 if (Constraint.size() == 7 && Constraint[0] == '{' &&
27040 tolower(Constraint[1]) == 's' &&
27041 tolower(Constraint[2]) == 't' &&
27042 Constraint[3] == '(' &&
27043 (Constraint[4] >= '0' && Constraint[4] <= '7') &&
27044 Constraint[5] == ')' &&
27045 Constraint[6] == '}') {
27047 Res.first = X86::FP0+Constraint[4]-'0';
27048 Res.second = &X86::RFP80RegClass;
27052 // GCC allows "st(0)" to be called just plain "st".
27053 if (StringRef("{st}").equals_lower(Constraint)) {
27054 Res.first = X86::FP0;
27055 Res.second = &X86::RFP80RegClass;
27060 if (StringRef("{flags}").equals_lower(Constraint)) {
27061 Res.first = X86::EFLAGS;
27062 Res.second = &X86::CCRRegClass;
27066 // 'A' means EAX + EDX.
27067 if (Constraint == "A") {
27068 Res.first = X86::EAX;
27069 Res.second = &X86::GR32_ADRegClass;
27075 // Otherwise, check to see if this is a register class of the wrong value
27076 // type. For example, we want to map "{ax},i32" -> {eax}, we don't want it to
27077 // turn into {ax},{dx}.
27078 // MVT::Other is used to specify clobber names.
27079 if (Res.second->hasType(VT) || VT == MVT::Other)
27080 return Res; // Correct type already, nothing to do.
27082 // Get a matching integer of the correct size. i.e. "ax" with MVT::32 should
27083 // return "eax". This should even work for things like getting 64bit integer
27084 // registers when given an f64 type.
27085 const TargetRegisterClass *Class = Res.second;
27086 if (Class == &X86::GR8RegClass || Class == &X86::GR16RegClass ||
27087 Class == &X86::GR32RegClass || Class == &X86::GR64RegClass) {
27088 unsigned Size = VT.getSizeInBits();
27089 MVT::SimpleValueType SimpleTy = Size == 1 || Size == 8 ? MVT::i8
27090 : Size == 16 ? MVT::i16
27091 : Size == 32 ? MVT::i32
27092 : Size == 64 ? MVT::i64
27094 unsigned DestReg = getX86SubSuperRegisterOrZero(Res.first, SimpleTy);
27096 Res.first = DestReg;
27097 Res.second = SimpleTy == MVT::i8 ? &X86::GR8RegClass
27098 : SimpleTy == MVT::i16 ? &X86::GR16RegClass
27099 : SimpleTy == MVT::i32 ? &X86::GR32RegClass
27100 : &X86::GR64RegClass;
27101 assert(Res.second->contains(Res.first) && "Register in register class");
27103 // No register found/type mismatch.
27105 Res.second = nullptr;
27107 } else if (Class == &X86::FR32RegClass || Class == &X86::FR64RegClass ||
27108 Class == &X86::VR128RegClass || Class == &X86::VR256RegClass ||
27109 Class == &X86::FR32XRegClass || Class == &X86::FR64XRegClass ||
27110 Class == &X86::VR128XRegClass || Class == &X86::VR256XRegClass ||
27111 Class == &X86::VR512RegClass) {
27112 // Handle references to XMM physical registers that got mapped into the
27113 // wrong class. This can happen with constraints like {xmm0} where the
27114 // target independent register mapper will just pick the first match it can
27115 // find, ignoring the required type.
27117 if (VT == MVT::f32 || VT == MVT::i32)
27118 Res.second = &X86::FR32RegClass;
27119 else if (VT == MVT::f64 || VT == MVT::i64)
27120 Res.second = &X86::FR64RegClass;
27121 else if (X86::VR128RegClass.hasType(VT))
27122 Res.second = &X86::VR128RegClass;
27123 else if (X86::VR256RegClass.hasType(VT))
27124 Res.second = &X86::VR256RegClass;
27125 else if (X86::VR512RegClass.hasType(VT))
27126 Res.second = &X86::VR512RegClass;
27128 // Type mismatch and not a clobber: Return an error;
27130 Res.second = nullptr;
27137 int X86TargetLowering::getScalingFactorCost(const DataLayout &DL,
27138 const AddrMode &AM, Type *Ty,
27139 unsigned AS) const {
27140 // Scaling factors are not free at all.
27141 // An indexed folded instruction, i.e., inst (reg1, reg2, scale),
27142 // will take 2 allocations in the out of order engine instead of 1
27143 // for plain addressing mode, i.e. inst (reg1).
27145 // vaddps (%rsi,%drx), %ymm0, %ymm1
27146 // Requires two allocations (one for the load, one for the computation)
27148 // vaddps (%rsi), %ymm0, %ymm1
27149 // Requires just 1 allocation, i.e., freeing allocations for other operations
27150 // and having less micro operations to execute.
27152 // For some X86 architectures, this is even worse because for instance for
27153 // stores, the complex addressing mode forces the instruction to use the
27154 // "load" ports instead of the dedicated "store" port.
27155 // E.g., on Haswell:
27156 // vmovaps %ymm1, (%r8, %rdi) can use port 2 or 3.
27157 // vmovaps %ymm1, (%r8) can use port 2, 3, or 7.
27158 if (isLegalAddressingMode(DL, AM, Ty, AS))
27159 // Scale represents reg2 * scale, thus account for 1
27160 // as soon as we use a second register.
27161 return AM.Scale != 0;
27165 bool X86TargetLowering::isIntDivCheap(EVT VT, AttributeSet Attr) const {
27166 // Integer division on x86 is expensive. However, when aggressively optimizing
27167 // for code size, we prefer to use a div instruction, as it is usually smaller
27168 // than the alternative sequence.
27169 // The exception to this is vector division. Since x86 doesn't have vector
27170 // integer division, leaving the division as-is is a loss even in terms of
27171 // size, because it will have to be scalarized, while the alternative code
27172 // sequence can be performed in vector form.
27173 bool OptSize = Attr.hasAttribute(AttributeSet::FunctionIndex,
27174 Attribute::MinSize);
27175 return OptSize && !VT.isVector();