1 //===-- ARMISelLowering.cpp - ARM 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 ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
16 #include "ARMAddressingModes.h"
17 #include "ARMConstantPoolValue.h"
18 #include "ARMISelLowering.h"
19 #include "ARMMachineFunctionInfo.h"
20 #include "ARMPerfectShuffle.h"
21 #include "ARMRegisterInfo.h"
22 #include "ARMSubtarget.h"
23 #include "ARMTargetMachine.h"
24 #include "ARMTargetObjectFile.h"
25 #include "llvm/CallingConv.h"
26 #include "llvm/Constants.h"
27 #include "llvm/Function.h"
28 #include "llvm/GlobalValue.h"
29 #include "llvm/Instruction.h"
30 #include "llvm/Intrinsics.h"
31 #include "llvm/Type.h"
32 #include "llvm/CodeGen/CallingConvLower.h"
33 #include "llvm/CodeGen/MachineBasicBlock.h"
34 #include "llvm/CodeGen/MachineFrameInfo.h"
35 #include "llvm/CodeGen/MachineFunction.h"
36 #include "llvm/CodeGen/MachineInstrBuilder.h"
37 #include "llvm/CodeGen/MachineRegisterInfo.h"
38 #include "llvm/CodeGen/PseudoSourceValue.h"
39 #include "llvm/CodeGen/SelectionDAG.h"
40 #include "llvm/Target/TargetOptions.h"
41 #include "llvm/ADT/VectorExtras.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MathExtras.h"
47 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
48 CCValAssign::LocInfo &LocInfo,
49 ISD::ArgFlagsTy &ArgFlags,
51 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
52 CCValAssign::LocInfo &LocInfo,
53 ISD::ArgFlagsTy &ArgFlags,
55 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
56 CCValAssign::LocInfo &LocInfo,
57 ISD::ArgFlagsTy &ArgFlags,
59 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
60 CCValAssign::LocInfo &LocInfo,
61 ISD::ArgFlagsTy &ArgFlags,
64 void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
65 EVT PromotedBitwiseVT) {
66 if (VT != PromotedLdStVT) {
67 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
68 AddPromotedToType (ISD::LOAD, VT.getSimpleVT(),
69 PromotedLdStVT.getSimpleVT());
71 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
72 AddPromotedToType (ISD::STORE, VT.getSimpleVT(),
73 PromotedLdStVT.getSimpleVT());
76 EVT ElemTy = VT.getVectorElementType();
77 if (ElemTy != MVT::i64 && ElemTy != MVT::f64)
78 setOperationAction(ISD::VSETCC, VT.getSimpleVT(), Custom);
79 if (ElemTy == MVT::i8 || ElemTy == MVT::i16)
80 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
81 if (ElemTy != MVT::i32) {
82 setOperationAction(ISD::SINT_TO_FP, VT.getSimpleVT(), Expand);
83 setOperationAction(ISD::UINT_TO_FP, VT.getSimpleVT(), Expand);
84 setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Expand);
85 setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Expand);
87 setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
88 setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
89 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Custom);
90 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Expand);
92 setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
93 setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
94 setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
97 // Promote all bit-wise operations.
98 if (VT.isInteger() && VT != PromotedBitwiseVT) {
99 setOperationAction(ISD::AND, VT.getSimpleVT(), Promote);
100 AddPromotedToType (ISD::AND, VT.getSimpleVT(),
101 PromotedBitwiseVT.getSimpleVT());
102 setOperationAction(ISD::OR, VT.getSimpleVT(), Promote);
103 AddPromotedToType (ISD::OR, VT.getSimpleVT(),
104 PromotedBitwiseVT.getSimpleVT());
105 setOperationAction(ISD::XOR, VT.getSimpleVT(), Promote);
106 AddPromotedToType (ISD::XOR, VT.getSimpleVT(),
107 PromotedBitwiseVT.getSimpleVT());
110 // Neon does not support vector divide/remainder operations.
111 setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
112 setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
113 setOperationAction(ISD::FDIV, VT.getSimpleVT(), Expand);
114 setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
115 setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
116 setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
119 void ARMTargetLowering::addDRTypeForNEON(EVT VT) {
120 addRegisterClass(VT, ARM::DPRRegisterClass);
121 addTypeForNEON(VT, MVT::f64, MVT::v2i32);
124 void ARMTargetLowering::addQRTypeForNEON(EVT VT) {
125 addRegisterClass(VT, ARM::QPRRegisterClass);
126 addTypeForNEON(VT, MVT::v2f64, MVT::v4i32);
129 static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) {
130 if (TM.getSubtarget<ARMSubtarget>().isTargetDarwin())
131 return new TargetLoweringObjectFileMachO();
132 return new ARMElfTargetObjectFile();
135 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
136 : TargetLowering(TM, createTLOF(TM)) {
137 Subtarget = &TM.getSubtarget<ARMSubtarget>();
139 if (Subtarget->isTargetDarwin()) {
140 // Uses VFP for Thumb libfuncs if available.
141 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
142 // Single-precision floating-point arithmetic.
143 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
144 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
145 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
146 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
148 // Double-precision floating-point arithmetic.
149 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
150 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
151 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
152 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
154 // Single-precision comparisons.
155 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
156 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
157 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
158 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
159 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
160 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
161 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
162 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
164 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
165 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
166 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
167 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
168 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
169 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
170 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
171 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
173 // Double-precision comparisons.
174 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
175 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
176 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
177 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
178 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
179 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
180 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
181 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
183 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
184 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
185 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
186 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
187 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
188 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
189 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
190 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
192 // Floating-point to integer conversions.
193 // i64 conversions are done via library routines even when generating VFP
194 // instructions, so use the same ones.
195 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
196 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
197 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
198 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
200 // Conversions between floating types.
201 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
202 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
204 // Integer to floating-point conversions.
205 // i64 conversions are done via library routines even when generating VFP
206 // instructions, so use the same ones.
207 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
208 // e.g., __floatunsidf vs. __floatunssidfvfp.
209 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
210 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
211 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
212 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
216 // These libcalls are not available in 32-bit.
217 setLibcallName(RTLIB::SHL_I128, 0);
218 setLibcallName(RTLIB::SRL_I128, 0);
219 setLibcallName(RTLIB::SRA_I128, 0);
221 // Libcalls should use the AAPCS base standard ABI, even if hard float
222 // is in effect, as per the ARM RTABI specification, section 4.1.2.
223 if (Subtarget->isAAPCS_ABI()) {
224 for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) {
225 setLibcallCallingConv(static_cast<RTLIB::Libcall>(i),
226 CallingConv::ARM_AAPCS);
230 if (Subtarget->isThumb1Only())
231 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
233 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
234 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
235 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
236 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
238 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
241 if (Subtarget->hasNEON()) {
242 addDRTypeForNEON(MVT::v2f32);
243 addDRTypeForNEON(MVT::v8i8);
244 addDRTypeForNEON(MVT::v4i16);
245 addDRTypeForNEON(MVT::v2i32);
246 addDRTypeForNEON(MVT::v1i64);
248 addQRTypeForNEON(MVT::v4f32);
249 addQRTypeForNEON(MVT::v2f64);
250 addQRTypeForNEON(MVT::v16i8);
251 addQRTypeForNEON(MVT::v8i16);
252 addQRTypeForNEON(MVT::v4i32);
253 addQRTypeForNEON(MVT::v2i64);
255 // v2f64 is legal so that QR subregs can be extracted as f64 elements, but
256 // neither Neon nor VFP support any arithmetic operations on it.
257 setOperationAction(ISD::FADD, MVT::v2f64, Expand);
258 setOperationAction(ISD::FSUB, MVT::v2f64, Expand);
259 setOperationAction(ISD::FMUL, MVT::v2f64, Expand);
260 setOperationAction(ISD::FDIV, MVT::v2f64, Expand);
261 setOperationAction(ISD::FREM, MVT::v2f64, Expand);
262 setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Expand);
263 setOperationAction(ISD::VSETCC, MVT::v2f64, Expand);
264 setOperationAction(ISD::FNEG, MVT::v2f64, Expand);
265 setOperationAction(ISD::FABS, MVT::v2f64, Expand);
266 setOperationAction(ISD::FSQRT, MVT::v2f64, Expand);
267 setOperationAction(ISD::FSIN, MVT::v2f64, Expand);
268 setOperationAction(ISD::FCOS, MVT::v2f64, Expand);
269 setOperationAction(ISD::FPOWI, MVT::v2f64, Expand);
270 setOperationAction(ISD::FPOW, MVT::v2f64, Expand);
271 setOperationAction(ISD::FLOG, MVT::v2f64, Expand);
272 setOperationAction(ISD::FLOG2, MVT::v2f64, Expand);
273 setOperationAction(ISD::FLOG10, MVT::v2f64, Expand);
274 setOperationAction(ISD::FEXP, MVT::v2f64, Expand);
275 setOperationAction(ISD::FEXP2, MVT::v2f64, Expand);
276 setOperationAction(ISD::FCEIL, MVT::v2f64, Expand);
277 setOperationAction(ISD::FTRUNC, MVT::v2f64, Expand);
278 setOperationAction(ISD::FRINT, MVT::v2f64, Expand);
279 setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Expand);
280 setOperationAction(ISD::FFLOOR, MVT::v2f64, Expand);
282 // Neon does not support some operations on v1i64 and v2i64 types.
283 setOperationAction(ISD::MUL, MVT::v1i64, Expand);
284 setOperationAction(ISD::MUL, MVT::v2i64, Expand);
285 setOperationAction(ISD::VSETCC, MVT::v1i64, Expand);
286 setOperationAction(ISD::VSETCC, MVT::v2i64, Expand);
288 setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
289 setTargetDAGCombine(ISD::SHL);
290 setTargetDAGCombine(ISD::SRL);
291 setTargetDAGCombine(ISD::SRA);
292 setTargetDAGCombine(ISD::SIGN_EXTEND);
293 setTargetDAGCombine(ISD::ZERO_EXTEND);
294 setTargetDAGCombine(ISD::ANY_EXTEND);
297 computeRegisterProperties();
299 // ARM does not have f32 extending load.
300 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
302 // ARM does not have i1 sign extending load.
303 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
305 // ARM supports all 4 flavors of integer indexed load / store.
306 if (!Subtarget->isThumb1Only()) {
307 for (unsigned im = (unsigned)ISD::PRE_INC;
308 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
309 setIndexedLoadAction(im, MVT::i1, Legal);
310 setIndexedLoadAction(im, MVT::i8, Legal);
311 setIndexedLoadAction(im, MVT::i16, Legal);
312 setIndexedLoadAction(im, MVT::i32, Legal);
313 setIndexedStoreAction(im, MVT::i1, Legal);
314 setIndexedStoreAction(im, MVT::i8, Legal);
315 setIndexedStoreAction(im, MVT::i16, Legal);
316 setIndexedStoreAction(im, MVT::i32, Legal);
320 // i64 operation support.
321 if (Subtarget->isThumb1Only()) {
322 setOperationAction(ISD::MUL, MVT::i64, Expand);
323 setOperationAction(ISD::MULHU, MVT::i32, Expand);
324 setOperationAction(ISD::MULHS, MVT::i32, Expand);
325 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
326 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
328 setOperationAction(ISD::MUL, MVT::i64, Expand);
329 setOperationAction(ISD::MULHU, MVT::i32, Expand);
330 if (!Subtarget->hasV6Ops())
331 setOperationAction(ISD::MULHS, MVT::i32, Expand);
333 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
334 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
335 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
336 setOperationAction(ISD::SRL, MVT::i64, Custom);
337 setOperationAction(ISD::SRA, MVT::i64, Custom);
339 // ARM does not have ROTL.
340 setOperationAction(ISD::ROTL, MVT::i32, Expand);
341 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
342 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
343 if (!Subtarget->hasV5TOps() || Subtarget->isThumb1Only())
344 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
346 // Only ARMv6 has BSWAP.
347 if (!Subtarget->hasV6Ops())
348 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
350 // These are expanded into libcalls.
351 setOperationAction(ISD::SDIV, MVT::i32, Expand);
352 setOperationAction(ISD::UDIV, MVT::i32, Expand);
353 setOperationAction(ISD::SREM, MVT::i32, Expand);
354 setOperationAction(ISD::UREM, MVT::i32, Expand);
355 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
356 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
358 // Support label based line numbers.
359 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
360 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
362 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
363 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
364 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
365 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
366 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
368 // Use the default implementation.
369 setOperationAction(ISD::VASTART, MVT::Other, Custom);
370 setOperationAction(ISD::VAARG, MVT::Other, Expand);
371 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
372 setOperationAction(ISD::VAEND, MVT::Other, Expand);
373 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
374 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
375 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
376 // FIXME: Shouldn't need this, since no register is used, but the legalizer
377 // doesn't yet know how to not do that for SjLj.
378 setExceptionSelectorRegister(ARM::R0);
379 if (Subtarget->isThumb())
380 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Custom);
382 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
383 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
385 if (!Subtarget->hasV6Ops() && !Subtarget->isThumb2()) {
386 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
387 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
389 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
391 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only())
392 // Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR iff target supports vfp2.
393 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
395 // We want to custom lower some of our intrinsics.
396 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
398 setOperationAction(ISD::SETCC, MVT::i32, Expand);
399 setOperationAction(ISD::SETCC, MVT::f32, Expand);
400 setOperationAction(ISD::SETCC, MVT::f64, Expand);
401 setOperationAction(ISD::SELECT, MVT::i32, Expand);
402 setOperationAction(ISD::SELECT, MVT::f32, Expand);
403 setOperationAction(ISD::SELECT, MVT::f64, Expand);
404 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
405 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
406 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
408 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
409 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
410 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
411 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
412 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
414 // We don't support sin/cos/fmod/copysign/pow
415 setOperationAction(ISD::FSIN, MVT::f64, Expand);
416 setOperationAction(ISD::FSIN, MVT::f32, Expand);
417 setOperationAction(ISD::FCOS, MVT::f32, Expand);
418 setOperationAction(ISD::FCOS, MVT::f64, Expand);
419 setOperationAction(ISD::FREM, MVT::f64, Expand);
420 setOperationAction(ISD::FREM, MVT::f32, Expand);
421 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
422 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
423 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
425 setOperationAction(ISD::FPOW, MVT::f64, Expand);
426 setOperationAction(ISD::FPOW, MVT::f32, Expand);
428 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
429 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
430 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
431 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
432 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
433 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
436 // We have target-specific dag combine patterns for the following nodes:
437 // ARMISD::VMOVRRD - No need to call setTargetDAGCombine
438 setTargetDAGCombine(ISD::ADD);
439 setTargetDAGCombine(ISD::SUB);
441 setStackPointerRegisterToSaveRestore(ARM::SP);
442 setSchedulingPreference(SchedulingForRegPressure);
444 // FIXME: If-converter should use instruction latency to determine
445 // profitability rather than relying on fixed limits.
446 if (Subtarget->getCPUString() == "generic") {
447 // Generic (and overly aggressive) if-conversion limits.
448 setIfCvtBlockSizeLimit(10);
449 setIfCvtDupBlockSizeLimit(2);
450 } else if (Subtarget->hasV6Ops()) {
451 setIfCvtBlockSizeLimit(2);
452 setIfCvtDupBlockSizeLimit(1);
454 setIfCvtBlockSizeLimit(3);
455 setIfCvtDupBlockSizeLimit(2);
458 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
459 // Do not enable CodePlacementOpt for now: it currently runs after the
460 // ARMConstantIslandPass and messes up branch relaxation and placement
461 // of constant islands.
462 // benefitFromCodePlacementOpt = true;
465 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
468 case ARMISD::Wrapper: return "ARMISD::Wrapper";
469 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
470 case ARMISD::CALL: return "ARMISD::CALL";
471 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
472 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
473 case ARMISD::tCALL: return "ARMISD::tCALL";
474 case ARMISD::BRCOND: return "ARMISD::BRCOND";
475 case ARMISD::BR_JT: return "ARMISD::BR_JT";
476 case ARMISD::BR2_JT: return "ARMISD::BR2_JT";
477 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
478 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
479 case ARMISD::CMP: return "ARMISD::CMP";
480 case ARMISD::CMPZ: return "ARMISD::CMPZ";
481 case ARMISD::CMPFP: return "ARMISD::CMPFP";
482 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
483 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
484 case ARMISD::CMOV: return "ARMISD::CMOV";
485 case ARMISD::CNEG: return "ARMISD::CNEG";
487 case ARMISD::FTOSI: return "ARMISD::FTOSI";
488 case ARMISD::FTOUI: return "ARMISD::FTOUI";
489 case ARMISD::SITOF: return "ARMISD::SITOF";
490 case ARMISD::UITOF: return "ARMISD::UITOF";
492 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
493 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
494 case ARMISD::RRX: return "ARMISD::RRX";
496 case ARMISD::VMOVRRD: return "ARMISD::VMOVRRD";
497 case ARMISD::VMOVDRR: return "ARMISD::VMOVDRR";
499 case ARMISD::EH_SJLJ_SETJMP: return "ARMISD::EH_SJLJ_SETJMP";
500 case ARMISD::EH_SJLJ_LONGJMP:return "ARMISD::EH_SJLJ_LONGJMP";
502 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
504 case ARMISD::DYN_ALLOC: return "ARMISD::DYN_ALLOC";
506 case ARMISD::VCEQ: return "ARMISD::VCEQ";
507 case ARMISD::VCGE: return "ARMISD::VCGE";
508 case ARMISD::VCGEU: return "ARMISD::VCGEU";
509 case ARMISD::VCGT: return "ARMISD::VCGT";
510 case ARMISD::VCGTU: return "ARMISD::VCGTU";
511 case ARMISD::VTST: return "ARMISD::VTST";
513 case ARMISD::VSHL: return "ARMISD::VSHL";
514 case ARMISD::VSHRs: return "ARMISD::VSHRs";
515 case ARMISD::VSHRu: return "ARMISD::VSHRu";
516 case ARMISD::VSHLLs: return "ARMISD::VSHLLs";
517 case ARMISD::VSHLLu: return "ARMISD::VSHLLu";
518 case ARMISD::VSHLLi: return "ARMISD::VSHLLi";
519 case ARMISD::VSHRN: return "ARMISD::VSHRN";
520 case ARMISD::VRSHRs: return "ARMISD::VRSHRs";
521 case ARMISD::VRSHRu: return "ARMISD::VRSHRu";
522 case ARMISD::VRSHRN: return "ARMISD::VRSHRN";
523 case ARMISD::VQSHLs: return "ARMISD::VQSHLs";
524 case ARMISD::VQSHLu: return "ARMISD::VQSHLu";
525 case ARMISD::VQSHLsu: return "ARMISD::VQSHLsu";
526 case ARMISD::VQSHRNs: return "ARMISD::VQSHRNs";
527 case ARMISD::VQSHRNu: return "ARMISD::VQSHRNu";
528 case ARMISD::VQSHRNsu: return "ARMISD::VQSHRNsu";
529 case ARMISD::VQRSHRNs: return "ARMISD::VQRSHRNs";
530 case ARMISD::VQRSHRNu: return "ARMISD::VQRSHRNu";
531 case ARMISD::VQRSHRNsu: return "ARMISD::VQRSHRNsu";
532 case ARMISD::VGETLANEu: return "ARMISD::VGETLANEu";
533 case ARMISD::VGETLANEs: return "ARMISD::VGETLANEs";
534 case ARMISD::VDUP: return "ARMISD::VDUP";
535 case ARMISD::VDUPLANE: return "ARMISD::VDUPLANE";
536 case ARMISD::VEXT: return "ARMISD::VEXT";
537 case ARMISD::VREV64: return "ARMISD::VREV64";
538 case ARMISD::VREV32: return "ARMISD::VREV32";
539 case ARMISD::VREV16: return "ARMISD::VREV16";
540 case ARMISD::VZIP: return "ARMISD::VZIP";
541 case ARMISD::VUZP: return "ARMISD::VUZP";
542 case ARMISD::VTRN: return "ARMISD::VTRN";
546 /// getFunctionAlignment - Return the Log2 alignment of this function.
547 unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
548 return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 0 : 1;
551 //===----------------------------------------------------------------------===//
553 //===----------------------------------------------------------------------===//
555 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
556 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
558 default: llvm_unreachable("Unknown condition code!");
559 case ISD::SETNE: return ARMCC::NE;
560 case ISD::SETEQ: return ARMCC::EQ;
561 case ISD::SETGT: return ARMCC::GT;
562 case ISD::SETGE: return ARMCC::GE;
563 case ISD::SETLT: return ARMCC::LT;
564 case ISD::SETLE: return ARMCC::LE;
565 case ISD::SETUGT: return ARMCC::HI;
566 case ISD::SETUGE: return ARMCC::HS;
567 case ISD::SETULT: return ARMCC::LO;
568 case ISD::SETULE: return ARMCC::LS;
572 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC.
573 static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
574 ARMCC::CondCodes &CondCode2) {
575 CondCode2 = ARMCC::AL;
577 default: llvm_unreachable("Unknown FP condition!");
579 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
581 case ISD::SETOGT: CondCode = ARMCC::GT; break;
583 case ISD::SETOGE: CondCode = ARMCC::GE; break;
584 case ISD::SETOLT: CondCode = ARMCC::MI; break;
585 case ISD::SETOLE: CondCode = ARMCC::LS; break;
586 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
587 case ISD::SETO: CondCode = ARMCC::VC; break;
588 case ISD::SETUO: CondCode = ARMCC::VS; break;
589 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
590 case ISD::SETUGT: CondCode = ARMCC::HI; break;
591 case ISD::SETUGE: CondCode = ARMCC::PL; break;
593 case ISD::SETULT: CondCode = ARMCC::LT; break;
595 case ISD::SETULE: CondCode = ARMCC::LE; break;
597 case ISD::SETUNE: CondCode = ARMCC::NE; break;
601 //===----------------------------------------------------------------------===//
602 // Calling Convention Implementation
603 //===----------------------------------------------------------------------===//
605 #include "ARMGenCallingConv.inc"
607 // APCS f64 is in register pairs, possibly split to stack
608 static bool f64AssignAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
609 CCValAssign::LocInfo &LocInfo,
610 CCState &State, bool CanFail) {
611 static const unsigned RegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
613 // Try to get the first register.
614 if (unsigned Reg = State.AllocateReg(RegList, 4))
615 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
617 // For the 2nd half of a v2f64, do not fail.
621 // Put the whole thing on the stack.
622 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
623 State.AllocateStack(8, 4),
628 // Try to get the second register.
629 if (unsigned Reg = State.AllocateReg(RegList, 4))
630 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
632 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
633 State.AllocateStack(4, 4),
638 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
639 CCValAssign::LocInfo &LocInfo,
640 ISD::ArgFlagsTy &ArgFlags,
642 if (!f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
644 if (LocVT == MVT::v2f64 &&
645 !f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
647 return true; // we handled it
650 // AAPCS f64 is in aligned register pairs
651 static bool f64AssignAAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
652 CCValAssign::LocInfo &LocInfo,
653 CCState &State, bool CanFail) {
654 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
655 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
657 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
659 // For the 2nd half of a v2f64, do not just fail.
663 // Put the whole thing on the stack.
664 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
665 State.AllocateStack(8, 8),
671 for (i = 0; i < 2; ++i)
672 if (HiRegList[i] == Reg)
675 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
676 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
681 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
682 CCValAssign::LocInfo &LocInfo,
683 ISD::ArgFlagsTy &ArgFlags,
685 if (!f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
687 if (LocVT == MVT::v2f64 &&
688 !f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
690 return true; // we handled it
693 static bool f64RetAssign(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
694 CCValAssign::LocInfo &LocInfo, CCState &State) {
695 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
696 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
698 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
700 return false; // we didn't handle it
703 for (i = 0; i < 2; ++i)
704 if (HiRegList[i] == Reg)
707 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
708 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
713 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
714 CCValAssign::LocInfo &LocInfo,
715 ISD::ArgFlagsTy &ArgFlags,
717 if (!f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
719 if (LocVT == MVT::v2f64 && !f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
721 return true; // we handled it
724 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
725 CCValAssign::LocInfo &LocInfo,
726 ISD::ArgFlagsTy &ArgFlags,
728 return RetCC_ARM_APCS_Custom_f64(ValNo, ValVT, LocVT, LocInfo, ArgFlags,
732 /// CCAssignFnForNode - Selects the correct CCAssignFn for a the
733 /// given CallingConvention value.
734 CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC,
736 bool isVarArg) const {
739 llvm_unreachable("Unsupported calling convention");
741 case CallingConv::Fast:
742 // Use target triple & subtarget features to do actual dispatch.
743 if (Subtarget->isAAPCS_ABI()) {
744 if (Subtarget->hasVFP2() &&
745 FloatABIType == FloatABI::Hard && !isVarArg)
746 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
748 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
750 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
751 case CallingConv::ARM_AAPCS_VFP:
752 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
753 case CallingConv::ARM_AAPCS:
754 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
755 case CallingConv::ARM_APCS:
756 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
760 /// LowerCallResult - Lower the result values of a call into the
761 /// appropriate copies out of appropriate physical registers.
763 ARMTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
764 CallingConv::ID CallConv, bool isVarArg,
765 const SmallVectorImpl<ISD::InputArg> &Ins,
766 DebugLoc dl, SelectionDAG &DAG,
767 SmallVectorImpl<SDValue> &InVals) {
769 // Assign locations to each value returned by this call.
770 SmallVector<CCValAssign, 16> RVLocs;
771 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
772 RVLocs, *DAG.getContext());
773 CCInfo.AnalyzeCallResult(Ins,
774 CCAssignFnForNode(CallConv, /* Return*/ true,
777 // Copy all of the result registers out of their specified physreg.
778 for (unsigned i = 0; i != RVLocs.size(); ++i) {
779 CCValAssign VA = RVLocs[i];
782 if (VA.needsCustom()) {
783 // Handle f64 or half of a v2f64.
784 SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
786 Chain = Lo.getValue(1);
787 InFlag = Lo.getValue(2);
788 VA = RVLocs[++i]; // skip ahead to next loc
789 SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
791 Chain = Hi.getValue(1);
792 InFlag = Hi.getValue(2);
793 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
795 if (VA.getLocVT() == MVT::v2f64) {
796 SDValue Vec = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
797 Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
798 DAG.getConstant(0, MVT::i32));
800 VA = RVLocs[++i]; // skip ahead to next loc
801 Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
802 Chain = Lo.getValue(1);
803 InFlag = Lo.getValue(2);
804 VA = RVLocs[++i]; // skip ahead to next loc
805 Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
806 Chain = Hi.getValue(1);
807 InFlag = Hi.getValue(2);
808 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
809 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
810 DAG.getConstant(1, MVT::i32));
813 Val = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
815 Chain = Val.getValue(1);
816 InFlag = Val.getValue(2);
819 switch (VA.getLocInfo()) {
820 default: llvm_unreachable("Unknown loc info!");
821 case CCValAssign::Full: break;
822 case CCValAssign::BCvt:
823 Val = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), Val);
827 InVals.push_back(Val);
833 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
834 /// by "Src" to address "Dst" of size "Size". Alignment information is
835 /// specified by the specific parameter attribute. The copy will be passed as
836 /// a byval function parameter.
837 /// Sometimes what we are copying is the end of a larger object, the part that
838 /// does not fit in registers.
840 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
841 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
843 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
844 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
845 /*AlwaysInline=*/false, NULL, 0, NULL, 0);
848 /// LowerMemOpCallTo - Store the argument to the stack.
850 ARMTargetLowering::LowerMemOpCallTo(SDValue Chain,
851 SDValue StackPtr, SDValue Arg,
852 DebugLoc dl, SelectionDAG &DAG,
853 const CCValAssign &VA,
854 ISD::ArgFlagsTy Flags) {
855 unsigned LocMemOffset = VA.getLocMemOffset();
856 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
857 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
858 if (Flags.isByVal()) {
859 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
861 return DAG.getStore(Chain, dl, Arg, PtrOff,
862 PseudoSourceValue::getStack(), LocMemOffset);
865 void ARMTargetLowering::PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
866 SDValue Chain, SDValue &Arg,
867 RegsToPassVector &RegsToPass,
868 CCValAssign &VA, CCValAssign &NextVA,
870 SmallVector<SDValue, 8> &MemOpChains,
871 ISD::ArgFlagsTy Flags) {
873 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
874 DAG.getVTList(MVT::i32, MVT::i32), Arg);
875 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd));
877 if (NextVA.isRegLoc())
878 RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), fmrrd.getValue(1)));
880 assert(NextVA.isMemLoc());
881 if (StackPtr.getNode() == 0)
882 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
884 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, fmrrd.getValue(1),
890 /// LowerCall - Lowering a call into a callseq_start <-
891 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
894 ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
895 CallingConv::ID CallConv, bool isVarArg,
897 const SmallVectorImpl<ISD::OutputArg> &Outs,
898 const SmallVectorImpl<ISD::InputArg> &Ins,
899 DebugLoc dl, SelectionDAG &DAG,
900 SmallVectorImpl<SDValue> &InVals) {
902 // Analyze operands of the call, assigning locations to each operand.
903 SmallVector<CCValAssign, 16> ArgLocs;
904 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
906 CCInfo.AnalyzeCallOperands(Outs,
907 CCAssignFnForNode(CallConv, /* Return*/ false,
910 // Get a count of how many bytes are to be pushed on the stack.
911 unsigned NumBytes = CCInfo.getNextStackOffset();
913 // Adjust the stack pointer for the new arguments...
914 // These operations are automatically eliminated by the prolog/epilog pass
915 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
917 SDValue StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
919 RegsToPassVector RegsToPass;
920 SmallVector<SDValue, 8> MemOpChains;
922 // Walk the register/memloc assignments, inserting copies/loads. In the case
923 // of tail call optimization, arguments are handled later.
924 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
927 CCValAssign &VA = ArgLocs[i];
928 SDValue Arg = Outs[realArgIdx].Val;
929 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
931 // Promote the value if needed.
932 switch (VA.getLocInfo()) {
933 default: llvm_unreachable("Unknown loc info!");
934 case CCValAssign::Full: break;
935 case CCValAssign::SExt:
936 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
938 case CCValAssign::ZExt:
939 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
941 case CCValAssign::AExt:
942 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
944 case CCValAssign::BCvt:
945 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
949 // f64 and v2f64 might be passed in i32 pairs and must be split into pieces
950 if (VA.needsCustom()) {
951 if (VA.getLocVT() == MVT::v2f64) {
952 SDValue Op0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
953 DAG.getConstant(0, MVT::i32));
954 SDValue Op1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
955 DAG.getConstant(1, MVT::i32));
957 PassF64ArgInRegs(dl, DAG, Chain, Op0, RegsToPass,
958 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
960 VA = ArgLocs[++i]; // skip ahead to next loc
962 PassF64ArgInRegs(dl, DAG, Chain, Op1, RegsToPass,
963 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
965 assert(VA.isMemLoc());
966 if (StackPtr.getNode() == 0)
967 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
969 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Op1,
970 dl, DAG, VA, Flags));
973 PassF64ArgInRegs(dl, DAG, Chain, Arg, RegsToPass, VA, ArgLocs[++i],
974 StackPtr, MemOpChains, Flags);
976 } else if (VA.isRegLoc()) {
977 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
979 assert(VA.isMemLoc());
980 if (StackPtr.getNode() == 0)
981 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
983 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
984 dl, DAG, VA, Flags));
988 if (!MemOpChains.empty())
989 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
990 &MemOpChains[0], MemOpChains.size());
992 // Build a sequence of copy-to-reg nodes chained together with token chain
993 // and flag operands which copy the outgoing args into the appropriate regs.
995 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
996 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
997 RegsToPass[i].second, InFlag);
998 InFlag = Chain.getValue(1);
1001 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1002 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1003 // node so that legalize doesn't hack it.
1004 bool isDirect = false;
1005 bool isARMFunc = false;
1006 bool isLocalARMFunc = false;
1007 MachineFunction &MF = DAG.getMachineFunction();
1008 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1009 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1010 GlobalValue *GV = G->getGlobal();
1012 bool isExt = GV->isDeclaration() || GV->isWeakForLinker();
1013 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
1014 getTargetMachine().getRelocationModel() != Reloc::Static;
1015 isARMFunc = !Subtarget->isThumb() || isStub;
1016 // ARM call to a local ARM function is predicable.
1017 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
1018 // tBX takes a register source operand.
1019 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1020 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1021 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1024 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1025 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1026 Callee = DAG.getLoad(getPointerTy(), dl,
1027 DAG.getEntryNode(), CPAddr,
1028 PseudoSourceValue::getConstantPool(), 0);
1029 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1030 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1031 getPointerTy(), Callee, PICLabel);
1033 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
1034 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
1036 bool isStub = Subtarget->isTargetDarwin() &&
1037 getTargetMachine().getRelocationModel() != Reloc::Static;
1038 isARMFunc = !Subtarget->isThumb() || isStub;
1039 // tBX takes a register source operand.
1040 const char *Sym = S->getSymbol();
1041 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1042 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1043 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1044 Sym, ARMPCLabelIndex, 4);
1045 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1046 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1047 Callee = DAG.getLoad(getPointerTy(), dl,
1048 DAG.getEntryNode(), CPAddr,
1049 PseudoSourceValue::getConstantPool(), 0);
1050 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1051 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1052 getPointerTy(), Callee, PICLabel);
1054 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
1057 // FIXME: handle tail calls differently.
1059 if (Subtarget->isThumb()) {
1060 if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps())
1061 CallOpc = ARMISD::CALL_NOLINK;
1063 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
1065 CallOpc = (isDirect || Subtarget->hasV5TOps())
1066 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
1067 : ARMISD::CALL_NOLINK;
1069 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb1Only()) {
1070 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
1071 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
1072 InFlag = Chain.getValue(1);
1075 std::vector<SDValue> Ops;
1076 Ops.push_back(Chain);
1077 Ops.push_back(Callee);
1079 // Add argument registers to the end of the list so that they are known live
1081 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1082 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1083 RegsToPass[i].second.getValueType()));
1085 if (InFlag.getNode())
1086 Ops.push_back(InFlag);
1087 // Returns a chain and a flag for retval copy to use.
1088 Chain = DAG.getNode(CallOpc, dl, DAG.getVTList(MVT::Other, MVT::Flag),
1089 &Ops[0], Ops.size());
1090 InFlag = Chain.getValue(1);
1092 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1093 DAG.getIntPtrConstant(0, true), InFlag);
1095 InFlag = Chain.getValue(1);
1097 // Handle result values, copying them out of physregs into vregs that we
1099 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins,
1104 ARMTargetLowering::LowerReturn(SDValue Chain,
1105 CallingConv::ID CallConv, bool isVarArg,
1106 const SmallVectorImpl<ISD::OutputArg> &Outs,
1107 DebugLoc dl, SelectionDAG &DAG) {
1109 // CCValAssign - represent the assignment of the return value to a location.
1110 SmallVector<CCValAssign, 16> RVLocs;
1112 // CCState - Info about the registers and stack slots.
1113 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
1116 // Analyze outgoing return values.
1117 CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true,
1120 // If this is the first return lowered for this function, add
1121 // the regs to the liveout set for the function.
1122 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1123 for (unsigned i = 0; i != RVLocs.size(); ++i)
1124 if (RVLocs[i].isRegLoc())
1125 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1130 // Copy the result values into the output registers.
1131 for (unsigned i = 0, realRVLocIdx = 0;
1133 ++i, ++realRVLocIdx) {
1134 CCValAssign &VA = RVLocs[i];
1135 assert(VA.isRegLoc() && "Can only return in registers!");
1137 SDValue Arg = Outs[realRVLocIdx].Val;
1139 switch (VA.getLocInfo()) {
1140 default: llvm_unreachable("Unknown loc info!");
1141 case CCValAssign::Full: break;
1142 case CCValAssign::BCvt:
1143 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1147 if (VA.needsCustom()) {
1148 if (VA.getLocVT() == MVT::v2f64) {
1149 // Extract the first half and return it in two registers.
1150 SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1151 DAG.getConstant(0, MVT::i32));
1152 SDValue HalfGPRs = DAG.getNode(ARMISD::VMOVRRD, dl,
1153 DAG.getVTList(MVT::i32, MVT::i32), Half);
1155 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag);
1156 Flag = Chain.getValue(1);
1157 VA = RVLocs[++i]; // skip ahead to next loc
1158 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1159 HalfGPRs.getValue(1), Flag);
1160 Flag = Chain.getValue(1);
1161 VA = RVLocs[++i]; // skip ahead to next loc
1163 // Extract the 2nd half and fall through to handle it as an f64 value.
1164 Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1165 DAG.getConstant(1, MVT::i32));
1167 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
1169 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1170 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
1171 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
1172 Flag = Chain.getValue(1);
1173 VA = RVLocs[++i]; // skip ahead to next loc
1174 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
1177 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
1179 // Guarantee that all emitted copies are
1180 // stuck together, avoiding something bad.
1181 Flag = Chain.getValue(1);
1186 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
1188 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
1193 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
1194 // their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
1195 // one of the above mentioned nodes. It has to be wrapped because otherwise
1196 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
1197 // be used to form addressing mode. These wrapped nodes will be selected
1199 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
1200 EVT PtrVT = Op.getValueType();
1201 // FIXME there is no actual debug info here
1202 DebugLoc dl = Op.getDebugLoc();
1203 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1205 if (CP->isMachineConstantPoolEntry())
1206 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
1207 CP->getAlignment());
1209 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
1210 CP->getAlignment());
1211 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
1214 SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) {
1215 MachineFunction &MF = DAG.getMachineFunction();
1216 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1217 unsigned ARMPCLabelIndex = 0;
1218 DebugLoc DL = Op.getDebugLoc();
1219 EVT PtrVT = getPointerTy();
1220 BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1221 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1223 if (RelocM == Reloc::Static) {
1224 CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4);
1226 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1227 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1228 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex,
1229 ARMCP::CPBlockAddress,
1231 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1233 CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr);
1234 SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr,
1235 PseudoSourceValue::getConstantPool(), 0);
1236 if (RelocM == Reloc::Static)
1238 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1239 return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel);
1242 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
1244 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
1245 SelectionDAG &DAG) {
1246 DebugLoc dl = GA->getDebugLoc();
1247 EVT PtrVT = getPointerTy();
1248 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1249 MachineFunction &MF = DAG.getMachineFunction();
1250 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1251 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1252 ARMConstantPoolValue *CPV =
1253 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1254 ARMCP::CPValue, PCAdj, "tlsgd", true);
1255 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1256 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
1257 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument,
1258 PseudoSourceValue::getConstantPool(), 0);
1259 SDValue Chain = Argument.getValue(1);
1261 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1262 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
1264 // call __tls_get_addr.
1267 Entry.Node = Argument;
1268 Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext());
1269 Args.push_back(Entry);
1270 // FIXME: is there useful debug info available here?
1271 std::pair<SDValue, SDValue> CallResult =
1272 LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()),
1273 false, false, false, false,
1274 0, CallingConv::C, false, /*isReturnValueUsed=*/true,
1275 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
1276 return CallResult.first;
1279 // Lower ISD::GlobalTLSAddress using the "initial exec" or
1280 // "local exec" model.
1282 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
1283 SelectionDAG &DAG) {
1284 GlobalValue *GV = GA->getGlobal();
1285 DebugLoc dl = GA->getDebugLoc();
1287 SDValue Chain = DAG.getEntryNode();
1288 EVT PtrVT = getPointerTy();
1289 // Get the Thread Pointer
1290 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1292 if (GV->isDeclaration()) {
1293 MachineFunction &MF = DAG.getMachineFunction();
1294 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1295 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1296 // Initial exec model.
1297 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1298 ARMConstantPoolValue *CPV =
1299 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1300 ARMCP::CPValue, PCAdj, "gottpoff", true);
1301 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1302 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1303 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1304 PseudoSourceValue::getConstantPool(), 0);
1305 Chain = Offset.getValue(1);
1307 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1308 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
1310 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1311 PseudoSourceValue::getConstantPool(), 0);
1314 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, "tpoff");
1315 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1316 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1317 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1318 PseudoSourceValue::getConstantPool(), 0);
1321 // The address of the thread local variable is the add of the thread
1322 // pointer with the offset of the variable.
1323 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
1327 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) {
1328 // TODO: implement the "local dynamic" model
1329 assert(Subtarget->isTargetELF() &&
1330 "TLS not implemented for non-ELF targets");
1331 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
1332 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
1333 // otherwise use the "Local Exec" TLS Model
1334 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
1335 return LowerToTLSGeneralDynamicModel(GA, DAG);
1337 return LowerToTLSExecModels(GA, DAG);
1340 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
1341 SelectionDAG &DAG) {
1342 EVT PtrVT = getPointerTy();
1343 DebugLoc dl = Op.getDebugLoc();
1344 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1345 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1346 if (RelocM == Reloc::PIC_) {
1347 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
1348 ARMConstantPoolValue *CPV =
1349 new ARMConstantPoolValue(GV, UseGOTOFF ? "GOTOFF" : "GOT");
1350 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1351 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1352 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1354 PseudoSourceValue::getConstantPool(), 0);
1355 SDValue Chain = Result.getValue(1);
1356 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
1357 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
1359 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1360 PseudoSourceValue::getGOT(), 0);
1363 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1364 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1365 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1366 PseudoSourceValue::getConstantPool(), 0);
1370 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
1371 SelectionDAG &DAG) {
1372 MachineFunction &MF = DAG.getMachineFunction();
1373 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1374 unsigned ARMPCLabelIndex = 0;
1375 EVT PtrVT = getPointerTy();
1376 DebugLoc dl = Op.getDebugLoc();
1377 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1378 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1380 if (RelocM == Reloc::Static)
1381 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1383 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1384 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8);
1385 ARMConstantPoolValue *CPV =
1386 new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj);
1387 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1389 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1391 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1392 PseudoSourceValue::getConstantPool(), 0);
1393 SDValue Chain = Result.getValue(1);
1395 if (RelocM == Reloc::PIC_) {
1396 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1397 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1400 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
1401 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1402 PseudoSourceValue::getGOT(), 0);
1407 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
1409 assert(Subtarget->isTargetELF() &&
1410 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
1411 MachineFunction &MF = DAG.getMachineFunction();
1412 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1413 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1414 EVT PtrVT = getPointerTy();
1415 DebugLoc dl = Op.getDebugLoc();
1416 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1417 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1418 "_GLOBAL_OFFSET_TABLE_",
1419 ARMPCLabelIndex, PCAdj);
1420 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1421 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1422 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1423 PseudoSourceValue::getConstantPool(), 0);
1424 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1425 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1429 ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
1430 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1431 DebugLoc dl = Op.getDebugLoc();
1433 default: return SDValue(); // Don't custom lower most intrinsics.
1434 case Intrinsic::arm_thread_pointer: {
1435 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1436 return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1438 case Intrinsic::eh_sjlj_lsda: {
1439 MachineFunction &MF = DAG.getMachineFunction();
1440 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1441 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1442 EVT PtrVT = getPointerTy();
1443 DebugLoc dl = Op.getDebugLoc();
1444 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1446 unsigned PCAdj = (RelocM != Reloc::PIC_)
1447 ? 0 : (Subtarget->isThumb() ? 4 : 8);
1448 ARMConstantPoolValue *CPV =
1449 new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex,
1450 ARMCP::CPLSDA, PCAdj);
1451 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1452 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1454 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1455 PseudoSourceValue::getConstantPool(), 0);
1456 SDValue Chain = Result.getValue(1);
1458 if (RelocM == Reloc::PIC_) {
1459 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1460 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1464 case Intrinsic::eh_sjlj_setjmp:
1465 return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(1));
1469 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
1470 unsigned VarArgsFrameIndex) {
1471 // vastart just stores the address of the VarArgsFrameIndex slot into the
1472 // memory location argument.
1473 DebugLoc dl = Op.getDebugLoc();
1474 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1475 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1476 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1477 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0);
1481 ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) {
1482 SDNode *Node = Op.getNode();
1483 DebugLoc dl = Node->getDebugLoc();
1484 EVT VT = Node->getValueType(0);
1485 SDValue Chain = Op.getOperand(0);
1486 SDValue Size = Op.getOperand(1);
1487 SDValue Align = Op.getOperand(2);
1489 // Chain the dynamic stack allocation so that it doesn't modify the stack
1490 // pointer when other instructions are using the stack.
1491 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1493 unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue();
1494 unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment();
1495 if (AlignVal > StackAlign)
1496 // Do this now since selection pass cannot introduce new target
1497 // independent node.
1498 Align = DAG.getConstant(-(uint64_t)AlignVal, VT);
1500 // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up
1501 // using a "add r, sp, r" instead. Negate the size now so we don't have to
1502 // do even more horrible hack later.
1503 MachineFunction &MF = DAG.getMachineFunction();
1504 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1505 if (AFI->isThumb1OnlyFunction()) {
1507 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size);
1509 uint32_t Val = C->getZExtValue();
1510 if (Val <= 508 && ((Val & 3) == 0))
1514 Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size);
1517 SDVTList VTList = DAG.getVTList(VT, MVT::Other);
1518 SDValue Ops1[] = { Chain, Size, Align };
1519 SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3);
1520 Chain = Res.getValue(1);
1521 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1522 DAG.getIntPtrConstant(0, true), SDValue());
1523 SDValue Ops2[] = { Res, Chain };
1524 return DAG.getMergeValues(Ops2, 2, dl);
1528 ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
1529 SDValue &Root, SelectionDAG &DAG,
1531 MachineFunction &MF = DAG.getMachineFunction();
1532 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1534 TargetRegisterClass *RC;
1535 if (AFI->isThumb1OnlyFunction())
1536 RC = ARM::tGPRRegisterClass;
1538 RC = ARM::GPRRegisterClass;
1540 // Transform the arguments stored in physical registers into virtual ones.
1541 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1542 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1545 if (NextVA.isMemLoc()) {
1546 unsigned ArgSize = NextVA.getLocVT().getSizeInBits()/8;
1547 MachineFrameInfo *MFI = MF.getFrameInfo();
1548 int FI = MFI->CreateFixedObject(ArgSize, NextVA.getLocMemOffset(),
1551 // Create load node to retrieve arguments from the stack.
1552 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1553 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN,
1554 PseudoSourceValue::getFixedStack(FI), 0);
1556 Reg = MF.addLiveIn(NextVA.getLocReg(), RC);
1557 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1560 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, ArgValue, ArgValue2);
1564 ARMTargetLowering::LowerFormalArguments(SDValue Chain,
1565 CallingConv::ID CallConv, bool isVarArg,
1566 const SmallVectorImpl<ISD::InputArg>
1568 DebugLoc dl, SelectionDAG &DAG,
1569 SmallVectorImpl<SDValue> &InVals) {
1571 MachineFunction &MF = DAG.getMachineFunction();
1572 MachineFrameInfo *MFI = MF.getFrameInfo();
1574 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1576 // Assign locations to all of the incoming arguments.
1577 SmallVector<CCValAssign, 16> ArgLocs;
1578 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1580 CCInfo.AnalyzeFormalArguments(Ins,
1581 CCAssignFnForNode(CallConv, /* Return*/ false,
1584 SmallVector<SDValue, 16> ArgValues;
1586 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1587 CCValAssign &VA = ArgLocs[i];
1589 // Arguments stored in registers.
1590 if (VA.isRegLoc()) {
1591 EVT RegVT = VA.getLocVT();
1594 if (VA.needsCustom()) {
1595 // f64 and vector types are split up into multiple registers or
1596 // combinations of registers and stack slots.
1599 if (VA.getLocVT() == MVT::v2f64) {
1600 SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
1602 VA = ArgLocs[++i]; // skip ahead to next loc
1603 SDValue ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
1605 ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
1606 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
1607 ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
1608 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
1609 ArgValue, ArgValue2, DAG.getIntPtrConstant(1));
1611 ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl);
1614 TargetRegisterClass *RC;
1616 if (RegVT == MVT::f32)
1617 RC = ARM::SPRRegisterClass;
1618 else if (RegVT == MVT::f64)
1619 RC = ARM::DPRRegisterClass;
1620 else if (RegVT == MVT::v2f64)
1621 RC = ARM::QPRRegisterClass;
1622 else if (RegVT == MVT::i32)
1623 RC = (AFI->isThumb1OnlyFunction() ?
1624 ARM::tGPRRegisterClass : ARM::GPRRegisterClass);
1626 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
1628 // Transform the arguments in physical registers into virtual ones.
1629 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1630 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
1633 // If this is an 8 or 16-bit value, it is really passed promoted
1634 // to 32 bits. Insert an assert[sz]ext to capture this, then
1635 // truncate to the right size.
1636 switch (VA.getLocInfo()) {
1637 default: llvm_unreachable("Unknown loc info!");
1638 case CCValAssign::Full: break;
1639 case CCValAssign::BCvt:
1640 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue);
1642 case CCValAssign::SExt:
1643 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
1644 DAG.getValueType(VA.getValVT()));
1645 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1647 case CCValAssign::ZExt:
1648 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
1649 DAG.getValueType(VA.getValVT()));
1650 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1654 InVals.push_back(ArgValue);
1656 } else { // VA.isRegLoc()
1659 assert(VA.isMemLoc());
1660 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
1662 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1663 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(),
1666 // Create load nodes to retrieve arguments from the stack.
1667 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1668 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
1669 PseudoSourceValue::getFixedStack(FI), 0));
1675 static const unsigned GPRArgRegs[] = {
1676 ARM::R0, ARM::R1, ARM::R2, ARM::R3
1679 unsigned NumGPRs = CCInfo.getFirstUnallocated
1680 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
1682 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
1683 unsigned VARegSize = (4 - NumGPRs) * 4;
1684 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
1685 unsigned ArgOffset = CCInfo.getNextStackOffset();
1686 if (VARegSaveSize) {
1687 // If this function is vararg, store any remaining integer argument regs
1688 // to their spots on the stack so that they may be loaded by deferencing
1689 // the result of va_next.
1690 AFI->setVarArgsRegSaveSize(VARegSaveSize);
1691 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
1692 VARegSaveSize - VARegSize,
1694 SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
1696 SmallVector<SDValue, 4> MemOps;
1697 for (; NumGPRs < 4; ++NumGPRs) {
1698 TargetRegisterClass *RC;
1699 if (AFI->isThumb1OnlyFunction())
1700 RC = ARM::tGPRRegisterClass;
1702 RC = ARM::GPRRegisterClass;
1704 unsigned VReg = MF.addLiveIn(GPRArgRegs[NumGPRs], RC);
1705 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
1706 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1707 PseudoSourceValue::getFixedStack(VarArgsFrameIndex), 0);
1708 MemOps.push_back(Store);
1709 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
1710 DAG.getConstant(4, getPointerTy()));
1712 if (!MemOps.empty())
1713 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1714 &MemOps[0], MemOps.size());
1716 // This will point to the next argument passed via stack.
1717 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset, true, false);
1723 /// isFloatingPointZero - Return true if this is +0.0.
1724 static bool isFloatingPointZero(SDValue Op) {
1725 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1726 return CFP->getValueAPF().isPosZero();
1727 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
1728 // Maybe this has already been legalized into the constant pool?
1729 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1730 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
1731 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1732 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1733 return CFP->getValueAPF().isPosZero();
1739 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1740 /// the given operands.
1742 ARMTargetLowering::getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
1743 SDValue &ARMCC, SelectionDAG &DAG, DebugLoc dl) {
1744 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
1745 unsigned C = RHSC->getZExtValue();
1746 if (!isLegalICmpImmediate(C)) {
1747 // Constant does not fit, try adjusting it by one?
1752 if (isLegalICmpImmediate(C-1)) {
1753 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1754 RHS = DAG.getConstant(C-1, MVT::i32);
1759 if (C > 0 && isLegalICmpImmediate(C-1)) {
1760 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1761 RHS = DAG.getConstant(C-1, MVT::i32);
1766 if (isLegalICmpImmediate(C+1)) {
1767 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1768 RHS = DAG.getConstant(C+1, MVT::i32);
1773 if (C < 0xffffffff && isLegalICmpImmediate(C+1)) {
1774 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1775 RHS = DAG.getConstant(C+1, MVT::i32);
1782 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1783 ARMISD::NodeType CompareType;
1786 CompareType = ARMISD::CMP;
1791 CompareType = ARMISD::CMPZ;
1794 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1795 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
1798 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1799 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
1802 if (!isFloatingPointZero(RHS))
1803 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
1805 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
1806 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
1809 SDValue ARMTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
1810 EVT VT = Op.getValueType();
1811 SDValue LHS = Op.getOperand(0);
1812 SDValue RHS = Op.getOperand(1);
1813 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1814 SDValue TrueVal = Op.getOperand(2);
1815 SDValue FalseVal = Op.getOperand(3);
1816 DebugLoc dl = Op.getDebugLoc();
1818 if (LHS.getValueType() == MVT::i32) {
1820 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1821 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
1822 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
1825 ARMCC::CondCodes CondCode, CondCode2;
1826 FPCCToARMCC(CC, CondCode, CondCode2);
1828 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1829 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1830 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1831 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
1833 if (CondCode2 != ARMCC::AL) {
1834 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1835 // FIXME: Needs another CMP because flag can have but one use.
1836 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
1837 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
1838 Result, TrueVal, ARMCC2, CCR, Cmp2);
1843 SDValue ARMTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
1844 SDValue Chain = Op.getOperand(0);
1845 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1846 SDValue LHS = Op.getOperand(2);
1847 SDValue RHS = Op.getOperand(3);
1848 SDValue Dest = Op.getOperand(4);
1849 DebugLoc dl = Op.getDebugLoc();
1851 if (LHS.getValueType() == MVT::i32) {
1853 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1854 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
1855 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
1856 Chain, Dest, ARMCC, CCR,Cmp);
1859 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1860 ARMCC::CondCodes CondCode, CondCode2;
1861 FPCCToARMCC(CC, CondCode, CondCode2);
1863 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1864 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1865 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1866 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1867 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1868 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1869 if (CondCode2 != ARMCC::AL) {
1870 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1871 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1872 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1877 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
1878 SDValue Chain = Op.getOperand(0);
1879 SDValue Table = Op.getOperand(1);
1880 SDValue Index = Op.getOperand(2);
1881 DebugLoc dl = Op.getDebugLoc();
1883 EVT PTy = getPointerTy();
1884 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1885 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1886 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1887 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1888 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
1889 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
1890 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
1891 if (Subtarget->isThumb2()) {
1892 // Thumb2 uses a two-level jump. That is, it jumps into the jump table
1893 // which does another jump to the destination. This also makes it easier
1894 // to translate it to TBB / TBH later.
1895 // FIXME: This might not work if the function is extremely large.
1896 return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain,
1897 Addr, Op.getOperand(2), JTI, UId);
1899 if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
1900 Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr,
1901 PseudoSourceValue::getJumpTable(), 0);
1902 Chain = Addr.getValue(1);
1903 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
1904 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1906 Addr = DAG.getLoad(PTy, dl, Chain, Addr,
1907 PseudoSourceValue::getJumpTable(), 0);
1908 Chain = Addr.getValue(1);
1909 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1913 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
1914 DebugLoc dl = Op.getDebugLoc();
1916 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1917 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
1918 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
1921 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
1922 EVT VT = Op.getValueType();
1923 DebugLoc dl = Op.getDebugLoc();
1925 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1927 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
1928 return DAG.getNode(Opc, dl, VT, Op);
1931 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
1932 // Implement fcopysign with a fabs and a conditional fneg.
1933 SDValue Tmp0 = Op.getOperand(0);
1934 SDValue Tmp1 = Op.getOperand(1);
1935 DebugLoc dl = Op.getDebugLoc();
1936 EVT VT = Op.getValueType();
1937 EVT SrcVT = Tmp1.getValueType();
1938 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
1939 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
1940 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1941 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1942 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1945 SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
1946 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
1947 MFI->setFrameAddressIsTaken(true);
1948 EVT VT = Op.getValueType();
1949 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
1950 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1951 unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin())
1952 ? ARM::R7 : ARM::R11;
1953 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
1955 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0);
1960 ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
1962 SDValue Dst, SDValue Src,
1963 SDValue Size, unsigned Align,
1965 const Value *DstSV, uint64_t DstSVOff,
1966 const Value *SrcSV, uint64_t SrcSVOff){
1967 // Do repeated 4-byte loads and stores. To be improved.
1968 // This requires 4-byte alignment.
1969 if ((Align & 3) != 0)
1971 // This requires the copy size to be a constant, preferrably
1972 // within a subtarget-specific limit.
1973 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
1976 uint64_t SizeVal = ConstantSize->getZExtValue();
1977 if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
1980 unsigned BytesLeft = SizeVal & 3;
1981 unsigned NumMemOps = SizeVal >> 2;
1982 unsigned EmittedNumMemOps = 0;
1984 unsigned VTSize = 4;
1986 const unsigned MAX_LOADS_IN_LDM = 6;
1987 SDValue TFOps[MAX_LOADS_IN_LDM];
1988 SDValue Loads[MAX_LOADS_IN_LDM];
1989 uint64_t SrcOff = 0, DstOff = 0;
1991 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1992 // same number of stores. The loads and stores will get combined into
1993 // ldm/stm later on.
1994 while (EmittedNumMemOps < NumMemOps) {
1996 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1997 Loads[i] = DAG.getLoad(VT, dl, Chain,
1998 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1999 DAG.getConstant(SrcOff, MVT::i32)),
2000 SrcSV, SrcSVOff + SrcOff);
2001 TFOps[i] = Loads[i].getValue(1);
2004 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2007 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
2008 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
2009 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
2010 DAG.getConstant(DstOff, MVT::i32)),
2011 DstSV, DstSVOff + DstOff);
2014 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2016 EmittedNumMemOps += i;
2022 // Issue loads / stores for the trailing (1 - 3) bytes.
2023 unsigned BytesLeftSave = BytesLeft;
2026 if (BytesLeft >= 2) {
2034 Loads[i] = DAG.getLoad(VT, dl, Chain,
2035 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
2036 DAG.getConstant(SrcOff, MVT::i32)),
2037 SrcSV, SrcSVOff + SrcOff);
2038 TFOps[i] = Loads[i].getValue(1);
2041 BytesLeft -= VTSize;
2043 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2046 BytesLeft = BytesLeftSave;
2048 if (BytesLeft >= 2) {
2056 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
2057 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
2058 DAG.getConstant(DstOff, MVT::i32)),
2059 DstSV, DstSVOff + DstOff);
2062 BytesLeft -= VTSize;
2064 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2067 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
2068 SDValue Op = N->getOperand(0);
2069 DebugLoc dl = N->getDebugLoc();
2070 if (N->getValueType(0) == MVT::f64) {
2071 // Turn i64->f64 into VMOVDRR.
2072 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2073 DAG.getConstant(0, MVT::i32));
2074 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2075 DAG.getConstant(1, MVT::i32));
2076 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
2079 // Turn f64->i64 into VMOVRRD.
2080 SDValue Cvt = DAG.getNode(ARMISD::VMOVRRD, dl,
2081 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
2083 // Merge the pieces into a single i64 value.
2084 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
2087 /// getZeroVector - Returns a vector of specified type with all zero elements.
2089 static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2090 assert(VT.isVector() && "Expected a vector type");
2092 // Zero vectors are used to represent vector negation and in those cases
2093 // will be implemented with the NEON VNEG instruction. However, VNEG does
2094 // not support i64 elements, so sometimes the zero vectors will need to be
2095 // explicitly constructed. For those cases, and potentially other uses in
2096 // the future, always build zero vectors as <16 x i8> or <8 x i8> bitcasted
2097 // to their dest type. This ensures they get CSE'd.
2099 SDValue Cst = DAG.getTargetConstant(0, MVT::i8);
2100 SmallVector<SDValue, 8> Ops;
2103 if (VT.getSizeInBits() == 64) {
2104 Ops.assign(8, Cst); TVT = MVT::v8i8;
2106 Ops.assign(16, Cst); TVT = MVT::v16i8;
2108 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2110 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2113 /// getOnesVector - Returns a vector of specified type with all bits set.
2115 static SDValue getOnesVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2116 assert(VT.isVector() && "Expected a vector type");
2118 // Always build ones vectors as <16 x i8> or <8 x i8> bitcasted to their
2119 // dest type. This ensures they get CSE'd.
2121 SDValue Cst = DAG.getTargetConstant(0xFF, MVT::i8);
2122 SmallVector<SDValue, 8> Ops;
2125 if (VT.getSizeInBits() == 64) {
2126 Ops.assign(8, Cst); TVT = MVT::v8i8;
2128 Ops.assign(16, Cst); TVT = MVT::v16i8;
2130 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2132 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2135 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
2136 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2137 SDValue ARMTargetLowering::LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) {
2138 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2139 EVT VT = Op.getValueType();
2140 unsigned VTBits = VT.getSizeInBits();
2141 DebugLoc dl = Op.getDebugLoc();
2142 SDValue ShOpLo = Op.getOperand(0);
2143 SDValue ShOpHi = Op.getOperand(1);
2144 SDValue ShAmt = Op.getOperand(2);
2146 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
2148 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
2150 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2151 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2152 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
2153 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2154 DAG.getConstant(VTBits, MVT::i32));
2155 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
2156 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2157 SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
2159 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2160 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2162 SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
2163 SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC,
2166 SDValue Ops[2] = { Lo, Hi };
2167 return DAG.getMergeValues(Ops, 2, dl);
2170 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
2171 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2172 SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) {
2173 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2174 EVT VT = Op.getValueType();
2175 unsigned VTBits = VT.getSizeInBits();
2176 DebugLoc dl = Op.getDebugLoc();
2177 SDValue ShOpLo = Op.getOperand(0);
2178 SDValue ShOpHi = Op.getOperand(1);
2179 SDValue ShAmt = Op.getOperand(2);
2182 assert(Op.getOpcode() == ISD::SHL_PARTS);
2183 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2184 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2185 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
2186 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2187 DAG.getConstant(VTBits, MVT::i32));
2188 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
2189 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
2191 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2192 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2193 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2195 SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
2196 SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMCC,
2199 SDValue Ops[2] = { Lo, Hi };
2200 return DAG.getMergeValues(Ops, 2, dl);
2203 static SDValue LowerShift(SDNode *N, SelectionDAG &DAG,
2204 const ARMSubtarget *ST) {
2205 EVT VT = N->getValueType(0);
2206 DebugLoc dl = N->getDebugLoc();
2208 // Lower vector shifts on NEON to use VSHL.
2209 if (VT.isVector()) {
2210 assert(ST->hasNEON() && "unexpected vector shift");
2212 // Left shifts translate directly to the vshiftu intrinsic.
2213 if (N->getOpcode() == ISD::SHL)
2214 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2215 DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32),
2216 N->getOperand(0), N->getOperand(1));
2218 assert((N->getOpcode() == ISD::SRA ||
2219 N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode");
2221 // NEON uses the same intrinsics for both left and right shifts. For
2222 // right shifts, the shift amounts are negative, so negate the vector of
2224 EVT ShiftVT = N->getOperand(1).getValueType();
2225 SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT,
2226 getZeroVector(ShiftVT, DAG, dl),
2228 Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ?
2229 Intrinsic::arm_neon_vshifts :
2230 Intrinsic::arm_neon_vshiftu);
2231 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2232 DAG.getConstant(vshiftInt, MVT::i32),
2233 N->getOperand(0), NegatedCount);
2236 // We can get here for a node like i32 = ISD::SHL i32, i64
2240 assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
2241 "Unknown shift to lower!");
2243 // We only lower SRA, SRL of 1 here, all others use generic lowering.
2244 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
2245 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
2248 // If we are in thumb mode, we don't have RRX.
2249 if (ST->isThumb1Only()) return SDValue();
2251 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
2252 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2253 DAG.getConstant(0, MVT::i32));
2254 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2255 DAG.getConstant(1, MVT::i32));
2257 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
2258 // captures the result into a carry flag.
2259 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
2260 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
2262 // The low part is an ARMISD::RRX operand, which shifts the carry in.
2263 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
2265 // Merge the pieces into a single i64 value.
2266 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
2269 static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
2270 SDValue TmpOp0, TmpOp1;
2271 bool Invert = false;
2275 SDValue Op0 = Op.getOperand(0);
2276 SDValue Op1 = Op.getOperand(1);
2277 SDValue CC = Op.getOperand(2);
2278 EVT VT = Op.getValueType();
2279 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
2280 DebugLoc dl = Op.getDebugLoc();
2282 if (Op.getOperand(1).getValueType().isFloatingPoint()) {
2283 switch (SetCCOpcode) {
2284 default: llvm_unreachable("Illegal FP comparison"); break;
2286 case ISD::SETNE: Invert = true; // Fallthrough
2288 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2290 case ISD::SETLT: Swap = true; // Fallthrough
2292 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2294 case ISD::SETLE: Swap = true; // Fallthrough
2296 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2297 case ISD::SETUGE: Swap = true; // Fallthrough
2298 case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break;
2299 case ISD::SETUGT: Swap = true; // Fallthrough
2300 case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break;
2301 case ISD::SETUEQ: Invert = true; // Fallthrough
2303 // Expand this to (OLT | OGT).
2307 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2308 Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1);
2310 case ISD::SETUO: Invert = true; // Fallthrough
2312 // Expand this to (OLT | OGE).
2316 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2317 Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1);
2321 // Integer comparisons.
2322 switch (SetCCOpcode) {
2323 default: llvm_unreachable("Illegal integer comparison"); break;
2324 case ISD::SETNE: Invert = true;
2325 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2326 case ISD::SETLT: Swap = true;
2327 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2328 case ISD::SETLE: Swap = true;
2329 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2330 case ISD::SETULT: Swap = true;
2331 case ISD::SETUGT: Opc = ARMISD::VCGTU; break;
2332 case ISD::SETULE: Swap = true;
2333 case ISD::SETUGE: Opc = ARMISD::VCGEU; break;
2336 // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero).
2337 if (Opc == ARMISD::VCEQ) {
2340 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
2342 else if (ISD::isBuildVectorAllZeros(Op0.getNode()))
2345 // Ignore bitconvert.
2346 if (AndOp.getNode() && AndOp.getOpcode() == ISD::BIT_CONVERT)
2347 AndOp = AndOp.getOperand(0);
2349 if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) {
2351 Op0 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(0));
2352 Op1 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(1));
2359 std::swap(Op0, Op1);
2361 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
2364 Result = DAG.getNOT(dl, Result, VT);
2369 /// isVMOVSplat - Check if the specified splat value corresponds to an immediate
2370 /// VMOV instruction, and if so, return the constant being splatted.
2371 static SDValue isVMOVSplat(uint64_t SplatBits, uint64_t SplatUndef,
2372 unsigned SplatBitSize, SelectionDAG &DAG) {
2373 switch (SplatBitSize) {
2375 // Any 1-byte value is OK.
2376 assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
2377 return DAG.getTargetConstant(SplatBits, MVT::i8);
2380 // NEON's 16-bit VMOV supports splat values where only one byte is nonzero.
2381 if ((SplatBits & ~0xff) == 0 ||
2382 (SplatBits & ~0xff00) == 0)
2383 return DAG.getTargetConstant(SplatBits, MVT::i16);
2387 // NEON's 32-bit VMOV supports splat values where:
2388 // * only one byte is nonzero, or
2389 // * the least significant byte is 0xff and the second byte is nonzero, or
2390 // * the least significant 2 bytes are 0xff and the third is nonzero.
2391 if ((SplatBits & ~0xff) == 0 ||
2392 (SplatBits & ~0xff00) == 0 ||
2393 (SplatBits & ~0xff0000) == 0 ||
2394 (SplatBits & ~0xff000000) == 0)
2395 return DAG.getTargetConstant(SplatBits, MVT::i32);
2397 if ((SplatBits & ~0xffff) == 0 &&
2398 ((SplatBits | SplatUndef) & 0xff) == 0xff)
2399 return DAG.getTargetConstant(SplatBits | 0xff, MVT::i32);
2401 if ((SplatBits & ~0xffffff) == 0 &&
2402 ((SplatBits | SplatUndef) & 0xffff) == 0xffff)
2403 return DAG.getTargetConstant(SplatBits | 0xffff, MVT::i32);
2405 // Note: there are a few 32-bit splat values (specifically: 00ffff00,
2406 // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not
2407 // VMOV.I32. A (very) minor optimization would be to replicate the value
2408 // and fall through here to test for a valid 64-bit splat. But, then the
2409 // caller would also need to check and handle the change in size.
2413 // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff.
2414 uint64_t BitMask = 0xff;
2416 for (int ByteNum = 0; ByteNum < 8; ++ByteNum) {
2417 if (((SplatBits | SplatUndef) & BitMask) == BitMask)
2419 else if ((SplatBits & BitMask) != 0)
2423 return DAG.getTargetConstant(Val, MVT::i64);
2427 llvm_unreachable("unexpected size for isVMOVSplat");
2434 /// getVMOVImm - If this is a build_vector of constants which can be
2435 /// formed by using a VMOV instruction of the specified element size,
2436 /// return the constant being splatted. The ByteSize field indicates the
2437 /// number of bytes of each element [1248].
2438 SDValue ARM::getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
2439 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N);
2440 APInt SplatBits, SplatUndef;
2441 unsigned SplatBitSize;
2443 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
2444 HasAnyUndefs, ByteSize * 8))
2447 if (SplatBitSize > ByteSize * 8)
2450 return isVMOVSplat(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
2454 static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
2455 bool &ReverseVEXT, unsigned &Imm) {
2456 unsigned NumElts = VT.getVectorNumElements();
2457 ReverseVEXT = false;
2460 // If this is a VEXT shuffle, the immediate value is the index of the first
2461 // element. The other shuffle indices must be the successive elements after
2463 unsigned ExpectedElt = Imm;
2464 for (unsigned i = 1; i < NumElts; ++i) {
2465 // Increment the expected index. If it wraps around, it may still be
2466 // a VEXT but the source vectors must be swapped.
2468 if (ExpectedElt == NumElts * 2) {
2473 if (ExpectedElt != static_cast<unsigned>(M[i]))
2477 // Adjust the index value if the source operands will be swapped.
2484 /// isVREVMask - Check if a vector shuffle corresponds to a VREV
2485 /// instruction with the specified blocksize. (The order of the elements
2486 /// within each block of the vector is reversed.)
2487 static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT,
2488 unsigned BlockSize) {
2489 assert((BlockSize==16 || BlockSize==32 || BlockSize==64) &&
2490 "Only possible block sizes for VREV are: 16, 32, 64");
2492 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2496 unsigned NumElts = VT.getVectorNumElements();
2497 unsigned BlockElts = M[0] + 1;
2499 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
2502 for (unsigned i = 0; i < NumElts; ++i) {
2503 if ((unsigned) M[i] !=
2504 (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts))
2511 static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT,
2512 unsigned &WhichResult) {
2513 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2517 unsigned NumElts = VT.getVectorNumElements();
2518 WhichResult = (M[0] == 0 ? 0 : 1);
2519 for (unsigned i = 0; i < NumElts; i += 2) {
2520 if ((unsigned) M[i] != i + WhichResult ||
2521 (unsigned) M[i+1] != i + NumElts + WhichResult)
2527 static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT,
2528 unsigned &WhichResult) {
2529 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2533 unsigned NumElts = VT.getVectorNumElements();
2534 WhichResult = (M[0] == 0 ? 0 : 1);
2535 for (unsigned i = 0; i != NumElts; ++i) {
2536 if ((unsigned) M[i] != 2 * i + WhichResult)
2540 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2541 if (VT.is64BitVector() && EltSz == 32)
2547 static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT,
2548 unsigned &WhichResult) {
2549 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2553 unsigned NumElts = VT.getVectorNumElements();
2554 WhichResult = (M[0] == 0 ? 0 : 1);
2555 unsigned Idx = WhichResult * NumElts / 2;
2556 for (unsigned i = 0; i != NumElts; i += 2) {
2557 if ((unsigned) M[i] != Idx ||
2558 (unsigned) M[i+1] != Idx + NumElts)
2563 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2564 if (VT.is64BitVector() && EltSz == 32)
2570 static SDValue BuildSplat(SDValue Val, EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2571 // Canonicalize all-zeros and all-ones vectors.
2572 ConstantSDNode *ConstVal = cast<ConstantSDNode>(Val.getNode());
2573 if (ConstVal->isNullValue())
2574 return getZeroVector(VT, DAG, dl);
2575 if (ConstVal->isAllOnesValue())
2576 return getOnesVector(VT, DAG, dl);
2579 if (VT.is64BitVector()) {
2580 switch (Val.getValueType().getSizeInBits()) {
2581 case 8: CanonicalVT = MVT::v8i8; break;
2582 case 16: CanonicalVT = MVT::v4i16; break;
2583 case 32: CanonicalVT = MVT::v2i32; break;
2584 case 64: CanonicalVT = MVT::v1i64; break;
2585 default: llvm_unreachable("unexpected splat element type"); break;
2588 assert(VT.is128BitVector() && "unknown splat vector size");
2589 switch (Val.getValueType().getSizeInBits()) {
2590 case 8: CanonicalVT = MVT::v16i8; break;
2591 case 16: CanonicalVT = MVT::v8i16; break;
2592 case 32: CanonicalVT = MVT::v4i32; break;
2593 case 64: CanonicalVT = MVT::v2i64; break;
2594 default: llvm_unreachable("unexpected splat element type"); break;
2598 // Build a canonical splat for this value.
2599 SmallVector<SDValue, 8> Ops;
2600 Ops.assign(CanonicalVT.getVectorNumElements(), Val);
2601 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT, &Ops[0],
2603 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Res);
2606 // If this is a case we can't handle, return null and let the default
2607 // expansion code take care of it.
2608 static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
2609 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
2610 DebugLoc dl = Op.getDebugLoc();
2611 EVT VT = Op.getValueType();
2613 APInt SplatBits, SplatUndef;
2614 unsigned SplatBitSize;
2616 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
2617 if (SplatBitSize <= 64) {
2618 SDValue Val = isVMOVSplat(SplatBits.getZExtValue(),
2619 SplatUndef.getZExtValue(), SplatBitSize, DAG);
2621 return BuildSplat(Val, VT, DAG, dl);
2625 // If there are only 2 elements in a 128-bit vector, insert them into an
2626 // undef vector. This handles the common case for 128-bit vector argument
2627 // passing, where the insertions should be translated to subreg accesses
2628 // with no real instructions.
2629 if (VT.is128BitVector() && Op.getNumOperands() == 2) {
2630 SDValue Val = DAG.getUNDEF(VT);
2631 SDValue Op0 = Op.getOperand(0);
2632 SDValue Op1 = Op.getOperand(1);
2633 if (Op0.getOpcode() != ISD::UNDEF)
2634 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, Op0,
2635 DAG.getIntPtrConstant(0));
2636 if (Op1.getOpcode() != ISD::UNDEF)
2637 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, Op1,
2638 DAG.getIntPtrConstant(1));
2645 /// isShuffleMaskLegal - Targets can use this to indicate that they only
2646 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
2647 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
2648 /// are assumed to be legal.
2650 ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
2652 if (VT.getVectorNumElements() == 4 &&
2653 (VT.is128BitVector() || VT.is64BitVector())) {
2654 unsigned PFIndexes[4];
2655 for (unsigned i = 0; i != 4; ++i) {
2659 PFIndexes[i] = M[i];
2662 // Compute the index in the perfect shuffle table.
2663 unsigned PFTableIndex =
2664 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
2665 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
2666 unsigned Cost = (PFEntry >> 30);
2673 unsigned Imm, WhichResult;
2675 return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
2676 isVREVMask(M, VT, 64) ||
2677 isVREVMask(M, VT, 32) ||
2678 isVREVMask(M, VT, 16) ||
2679 isVEXTMask(M, VT, ReverseVEXT, Imm) ||
2680 isVTRNMask(M, VT, WhichResult) ||
2681 isVUZPMask(M, VT, WhichResult) ||
2682 isVZIPMask(M, VT, WhichResult));
2685 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
2686 /// the specified operations to build the shuffle.
2687 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
2688 SDValue RHS, SelectionDAG &DAG,
2690 unsigned OpNum = (PFEntry >> 26) & 0x0F;
2691 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
2692 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
2695 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
2704 OP_VUZPL, // VUZP, left result
2705 OP_VUZPR, // VUZP, right result
2706 OP_VZIPL, // VZIP, left result
2707 OP_VZIPR, // VZIP, right result
2708 OP_VTRNL, // VTRN, left result
2709 OP_VTRNR // VTRN, right result
2712 if (OpNum == OP_COPY) {
2713 if (LHSID == (1*9+2)*9+3) return LHS;
2714 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
2718 SDValue OpLHS, OpRHS;
2719 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
2720 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
2721 EVT VT = OpLHS.getValueType();
2724 default: llvm_unreachable("Unknown shuffle opcode!");
2726 return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS);
2731 return DAG.getNode(ARMISD::VDUPLANE, dl, VT,
2732 OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32));
2736 return DAG.getNode(ARMISD::VEXT, dl, VT,
2738 DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32));
2741 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
2742 OpLHS, OpRHS).getValue(OpNum-OP_VUZPL);
2745 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
2746 OpLHS, OpRHS).getValue(OpNum-OP_VZIPL);
2749 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
2750 OpLHS, OpRHS).getValue(OpNum-OP_VTRNL);
2754 static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
2755 SDValue V1 = Op.getOperand(0);
2756 SDValue V2 = Op.getOperand(1);
2757 DebugLoc dl = Op.getDebugLoc();
2758 EVT VT = Op.getValueType();
2759 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
2760 SmallVector<int, 8> ShuffleMask;
2762 // Convert shuffles that are directly supported on NEON to target-specific
2763 // DAG nodes, instead of keeping them as shuffles and matching them again
2764 // during code selection. This is more efficient and avoids the possibility
2765 // of inconsistencies between legalization and selection.
2766 // FIXME: floating-point vectors should be canonicalized to integer vectors
2767 // of the same time so that they get CSEd properly.
2768 SVN->getMask(ShuffleMask);
2770 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
2771 int Lane = SVN->getSplatIndex();
2772 // If this is undef splat, generate it via "just" vdup, if possible.
2773 if (Lane == -1) Lane = 0;
2775 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
2776 return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
2778 return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1,
2779 DAG.getConstant(Lane, MVT::i32));
2784 if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) {
2787 return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2,
2788 DAG.getConstant(Imm, MVT::i32));
2791 if (isVREVMask(ShuffleMask, VT, 64))
2792 return DAG.getNode(ARMISD::VREV64, dl, VT, V1);
2793 if (isVREVMask(ShuffleMask, VT, 32))
2794 return DAG.getNode(ARMISD::VREV32, dl, VT, V1);
2795 if (isVREVMask(ShuffleMask, VT, 16))
2796 return DAG.getNode(ARMISD::VREV16, dl, VT, V1);
2798 // Check for Neon shuffles that modify both input vectors in place.
2799 // If both results are used, i.e., if there are two shuffles with the same
2800 // source operands and with masks corresponding to both results of one of
2801 // these operations, DAG memoization will ensure that a single node is
2802 // used for both shuffles.
2803 unsigned WhichResult;
2804 if (isVTRNMask(ShuffleMask, VT, WhichResult))
2805 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
2806 V1, V2).getValue(WhichResult);
2807 if (isVUZPMask(ShuffleMask, VT, WhichResult))
2808 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
2809 V1, V2).getValue(WhichResult);
2810 if (isVZIPMask(ShuffleMask, VT, WhichResult))
2811 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
2812 V1, V2).getValue(WhichResult);
2814 // If the shuffle is not directly supported and it has 4 elements, use
2815 // the PerfectShuffle-generated table to synthesize it from other shuffles.
2816 if (VT.getVectorNumElements() == 4 &&
2817 (VT.is128BitVector() || VT.is64BitVector())) {
2818 unsigned PFIndexes[4];
2819 for (unsigned i = 0; i != 4; ++i) {
2820 if (ShuffleMask[i] < 0)
2823 PFIndexes[i] = ShuffleMask[i];
2826 // Compute the index in the perfect shuffle table.
2827 unsigned PFTableIndex =
2828 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
2830 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
2831 unsigned Cost = (PFEntry >> 30);
2834 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
2840 static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) {
2841 EVT VT = Op.getValueType();
2842 DebugLoc dl = Op.getDebugLoc();
2843 SDValue Vec = Op.getOperand(0);
2844 SDValue Lane = Op.getOperand(1);
2845 assert(VT == MVT::i32 &&
2846 Vec.getValueType().getVectorElementType().getSizeInBits() < 32 &&
2847 "unexpected type for custom-lowering vector extract");
2848 return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane);
2851 static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
2852 // The only time a CONCAT_VECTORS operation can have legal types is when
2853 // two 64-bit vectors are concatenated to a 128-bit vector.
2854 assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 &&
2855 "unexpected CONCAT_VECTORS");
2856 DebugLoc dl = Op.getDebugLoc();
2857 SDValue Val = DAG.getUNDEF(MVT::v2f64);
2858 SDValue Op0 = Op.getOperand(0);
2859 SDValue Op1 = Op.getOperand(1);
2860 if (Op0.getOpcode() != ISD::UNDEF)
2861 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
2862 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op0),
2863 DAG.getIntPtrConstant(0));
2864 if (Op1.getOpcode() != ISD::UNDEF)
2865 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
2866 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op1),
2867 DAG.getIntPtrConstant(1));
2868 return DAG.getNode(ISD::BIT_CONVERT, dl, Op.getValueType(), Val);
2871 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
2872 switch (Op.getOpcode()) {
2873 default: llvm_unreachable("Don't know how to custom lower this!");
2874 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
2875 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
2876 case ISD::GlobalAddress:
2877 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
2878 LowerGlobalAddressELF(Op, DAG);
2879 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
2880 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
2881 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
2882 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
2883 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
2884 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
2885 case ISD::SINT_TO_FP:
2886 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
2887 case ISD::FP_TO_SINT:
2888 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
2889 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
2890 case ISD::RETURNADDR: break;
2891 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
2892 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
2893 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
2894 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
2897 case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget);
2898 case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG);
2899 case ISD::SRL_PARTS:
2900 case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG);
2901 case ISD::VSETCC: return LowerVSETCC(Op, DAG);
2902 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
2903 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
2904 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
2905 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
2910 /// ReplaceNodeResults - Replace the results of node with an illegal result
2911 /// type with new values built out of custom code.
2912 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
2913 SmallVectorImpl<SDValue>&Results,
2914 SelectionDAG &DAG) {
2915 switch (N->getOpcode()) {
2917 llvm_unreachable("Don't know how to custom expand this!");
2919 case ISD::BIT_CONVERT:
2920 Results.push_back(ExpandBIT_CONVERT(N, DAG));
2924 SDValue Res = LowerShift(N, DAG, Subtarget);
2926 Results.push_back(Res);
2932 //===----------------------------------------------------------------------===//
2933 // ARM Scheduler Hooks
2934 //===----------------------------------------------------------------------===//
2937 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
2938 MachineBasicBlock *BB,
2939 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
2940 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
2941 DebugLoc dl = MI->getDebugLoc();
2942 switch (MI->getOpcode()) {
2944 llvm_unreachable("Unexpected instr type to insert");
2945 case ARM::tMOVCCr_pseudo: {
2946 // To "insert" a SELECT_CC instruction, we actually have to insert the
2947 // diamond control-flow pattern. The incoming instruction knows the
2948 // destination vreg to set, the condition code register to branch on, the
2949 // true/false values to select between, and a branch opcode to use.
2950 const BasicBlock *LLVM_BB = BB->getBasicBlock();
2951 MachineFunction::iterator It = BB;
2957 // cmpTY ccX, r1, r2
2959 // fallthrough --> copy0MBB
2960 MachineBasicBlock *thisMBB = BB;
2961 MachineFunction *F = BB->getParent();
2962 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
2963 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
2964 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
2965 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
2966 F->insert(It, copy0MBB);
2967 F->insert(It, sinkMBB);
2968 // Update machine-CFG edges by first adding all successors of the current
2969 // block to the new block which will contain the Phi node for the select.
2970 // Also inform sdisel of the edge changes.
2971 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
2972 E = BB->succ_end(); I != E; ++I) {
2973 EM->insert(std::make_pair(*I, sinkMBB));
2974 sinkMBB->addSuccessor(*I);
2976 // Next, remove all successors of the current block, and add the true
2977 // and fallthrough blocks as its successors.
2978 while (!BB->succ_empty())
2979 BB->removeSuccessor(BB->succ_begin());
2980 BB->addSuccessor(copy0MBB);
2981 BB->addSuccessor(sinkMBB);
2984 // %FalseValue = ...
2985 // # fallthrough to sinkMBB
2988 // Update machine-CFG edges
2989 BB->addSuccessor(sinkMBB);
2992 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
2995 BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg())
2996 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
2997 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
2999 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
3006 case ARM::t2SUBrSPi_:
3007 case ARM::t2SUBrSPi12_:
3008 case ARM::t2SUBrSPs_: {
3009 MachineFunction *MF = BB->getParent();
3010 unsigned DstReg = MI->getOperand(0).getReg();
3011 unsigned SrcReg = MI->getOperand(1).getReg();
3012 bool DstIsDead = MI->getOperand(0).isDead();
3013 bool SrcIsKill = MI->getOperand(1).isKill();
3015 if (SrcReg != ARM::SP) {
3016 // Copy the source to SP from virtual register.
3017 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg);
3018 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3019 ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr;
3020 BuildMI(BB, dl, TII->get(CopyOpc), ARM::SP)
3021 .addReg(SrcReg, getKillRegState(SrcIsKill));
3025 bool NeedPred = false, NeedCC = false, NeedOp3 = false;
3026 switch (MI->getOpcode()) {
3028 llvm_unreachable("Unexpected pseudo instruction!");
3034 OpOpc = ARM::tADDspr;
3037 OpOpc = ARM::tSUBspi;
3039 case ARM::t2SUBrSPi_:
3040 OpOpc = ARM::t2SUBrSPi;
3041 NeedPred = true; NeedCC = true;
3043 case ARM::t2SUBrSPi12_:
3044 OpOpc = ARM::t2SUBrSPi12;
3047 case ARM::t2SUBrSPs_:
3048 OpOpc = ARM::t2SUBrSPs;
3049 NeedPred = true; NeedCC = true; NeedOp3 = true;
3052 MachineInstrBuilder MIB = BuildMI(BB, dl, TII->get(OpOpc), ARM::SP);
3053 if (OpOpc == ARM::tAND)
3054 AddDefaultT1CC(MIB);
3055 MIB.addReg(ARM::SP);
3056 MIB.addOperand(MI->getOperand(2));
3058 MIB.addOperand(MI->getOperand(3));
3060 AddDefaultPred(MIB);
3064 // Copy the result from SP to virtual register.
3065 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg);
3066 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3067 ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr;
3068 BuildMI(BB, dl, TII->get(CopyOpc))
3069 .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
3071 MF->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
3077 //===----------------------------------------------------------------------===//
3078 // ARM Optimization Hooks
3079 //===----------------------------------------------------------------------===//
3082 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
3083 TargetLowering::DAGCombinerInfo &DCI) {
3084 SelectionDAG &DAG = DCI.DAG;
3085 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3086 EVT VT = N->getValueType(0);
3087 unsigned Opc = N->getOpcode();
3088 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
3089 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
3090 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
3091 ISD::CondCode CC = ISD::SETCC_INVALID;
3094 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
3096 SDValue CCOp = Slct.getOperand(0);
3097 if (CCOp.getOpcode() == ISD::SETCC)
3098 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
3101 bool DoXform = false;
3103 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
3106 if (LHS.getOpcode() == ISD::Constant &&
3107 cast<ConstantSDNode>(LHS)->isNullValue()) {
3109 } else if (CC != ISD::SETCC_INVALID &&
3110 RHS.getOpcode() == ISD::Constant &&
3111 cast<ConstantSDNode>(RHS)->isNullValue()) {
3112 std::swap(LHS, RHS);
3113 SDValue Op0 = Slct.getOperand(0);
3114 EVT OpVT = isSlctCC ? Op0.getValueType() :
3115 Op0.getOperand(0).getValueType();
3116 bool isInt = OpVT.isInteger();
3117 CC = ISD::getSetCCInverse(CC, isInt);
3119 if (!TLI.isCondCodeLegal(CC, OpVT))
3120 return SDValue(); // Inverse operator isn't legal.
3127 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
3129 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
3130 Slct.getOperand(0), Slct.getOperand(1), CC);
3131 SDValue CCOp = Slct.getOperand(0);
3133 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
3134 CCOp.getOperand(0), CCOp.getOperand(1), CC);
3135 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
3136 CCOp, OtherOp, Result);
3141 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
3142 static SDValue PerformADDCombine(SDNode *N,
3143 TargetLowering::DAGCombinerInfo &DCI) {
3144 // added by evan in r37685 with no testcase.
3145 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3147 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
3148 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
3149 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
3150 if (Result.getNode()) return Result;
3152 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3153 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3154 if (Result.getNode()) return Result;
3160 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
3161 static SDValue PerformSUBCombine(SDNode *N,
3162 TargetLowering::DAGCombinerInfo &DCI) {
3163 // added by evan in r37685 with no testcase.
3164 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3166 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
3167 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3168 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3169 if (Result.getNode()) return Result;
3175 /// PerformVMOVRRDCombine - Target-specific dag combine xforms for ARMISD::VMOVRRD.
3176 static SDValue PerformVMOVRRDCombine(SDNode *N,
3177 TargetLowering::DAGCombinerInfo &DCI) {
3178 // fmrrd(fmdrr x, y) -> x,y
3179 SDValue InDouble = N->getOperand(0);
3180 if (InDouble.getOpcode() == ARMISD::VMOVDRR)
3181 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
3185 /// getVShiftImm - Check if this is a valid build_vector for the immediate
3186 /// operand of a vector shift operation, where all the elements of the
3187 /// build_vector must have the same constant integer value.
3188 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
3189 // Ignore bit_converts.
3190 while (Op.getOpcode() == ISD::BIT_CONVERT)
3191 Op = Op.getOperand(0);
3192 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
3193 APInt SplatBits, SplatUndef;
3194 unsigned SplatBitSize;
3196 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
3197 HasAnyUndefs, ElementBits) ||
3198 SplatBitSize > ElementBits)
3200 Cnt = SplatBits.getSExtValue();
3204 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
3205 /// operand of a vector shift left operation. That value must be in the range:
3206 /// 0 <= Value < ElementBits for a left shift; or
3207 /// 0 <= Value <= ElementBits for a long left shift.
3208 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
3209 assert(VT.isVector() && "vector shift count is not a vector type");
3210 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
3211 if (! getVShiftImm(Op, ElementBits, Cnt))
3213 return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits);
3216 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
3217 /// operand of a vector shift right operation. For a shift opcode, the value
3218 /// is positive, but for an intrinsic the value count must be negative. The
3219 /// absolute value must be in the range:
3220 /// 1 <= |Value| <= ElementBits for a right shift; or
3221 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
3222 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
3224 assert(VT.isVector() && "vector shift count is not a vector type");
3225 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
3226 if (! getVShiftImm(Op, ElementBits, Cnt))
3230 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits));
3233 /// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics.
3234 static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) {
3235 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
3238 // Don't do anything for most intrinsics.
3241 // Vector shifts: check for immediate versions and lower them.
3242 // Note: This is done during DAG combining instead of DAG legalizing because
3243 // the build_vectors for 64-bit vector element shift counts are generally
3244 // not legal, and it is hard to see their values after they get legalized to
3245 // loads from a constant pool.
3246 case Intrinsic::arm_neon_vshifts:
3247 case Intrinsic::arm_neon_vshiftu:
3248 case Intrinsic::arm_neon_vshiftls:
3249 case Intrinsic::arm_neon_vshiftlu:
3250 case Intrinsic::arm_neon_vshiftn:
3251 case Intrinsic::arm_neon_vrshifts:
3252 case Intrinsic::arm_neon_vrshiftu:
3253 case Intrinsic::arm_neon_vrshiftn:
3254 case Intrinsic::arm_neon_vqshifts:
3255 case Intrinsic::arm_neon_vqshiftu:
3256 case Intrinsic::arm_neon_vqshiftsu:
3257 case Intrinsic::arm_neon_vqshiftns:
3258 case Intrinsic::arm_neon_vqshiftnu:
3259 case Intrinsic::arm_neon_vqshiftnsu:
3260 case Intrinsic::arm_neon_vqrshiftns:
3261 case Intrinsic::arm_neon_vqrshiftnu:
3262 case Intrinsic::arm_neon_vqrshiftnsu: {
3263 EVT VT = N->getOperand(1).getValueType();
3265 unsigned VShiftOpc = 0;
3268 case Intrinsic::arm_neon_vshifts:
3269 case Intrinsic::arm_neon_vshiftu:
3270 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) {
3271 VShiftOpc = ARMISD::VSHL;
3274 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) {
3275 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ?
3276 ARMISD::VSHRs : ARMISD::VSHRu);
3281 case Intrinsic::arm_neon_vshiftls:
3282 case Intrinsic::arm_neon_vshiftlu:
3283 if (isVShiftLImm(N->getOperand(2), VT, true, Cnt))
3285 llvm_unreachable("invalid shift count for vshll intrinsic");
3287 case Intrinsic::arm_neon_vrshifts:
3288 case Intrinsic::arm_neon_vrshiftu:
3289 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt))
3293 case Intrinsic::arm_neon_vqshifts:
3294 case Intrinsic::arm_neon_vqshiftu:
3295 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
3299 case Intrinsic::arm_neon_vqshiftsu:
3300 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
3302 llvm_unreachable("invalid shift count for vqshlu intrinsic");
3304 case Intrinsic::arm_neon_vshiftn:
3305 case Intrinsic::arm_neon_vrshiftn:
3306 case Intrinsic::arm_neon_vqshiftns:
3307 case Intrinsic::arm_neon_vqshiftnu:
3308 case Intrinsic::arm_neon_vqshiftnsu:
3309 case Intrinsic::arm_neon_vqrshiftns:
3310 case Intrinsic::arm_neon_vqrshiftnu:
3311 case Intrinsic::arm_neon_vqrshiftnsu:
3312 // Narrowing shifts require an immediate right shift.
3313 if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt))
3315 llvm_unreachable("invalid shift count for narrowing vector shift intrinsic");
3318 llvm_unreachable("unhandled vector shift");
3322 case Intrinsic::arm_neon_vshifts:
3323 case Intrinsic::arm_neon_vshiftu:
3324 // Opcode already set above.
3326 case Intrinsic::arm_neon_vshiftls:
3327 case Intrinsic::arm_neon_vshiftlu:
3328 if (Cnt == VT.getVectorElementType().getSizeInBits())
3329 VShiftOpc = ARMISD::VSHLLi;
3331 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ?
3332 ARMISD::VSHLLs : ARMISD::VSHLLu);
3334 case Intrinsic::arm_neon_vshiftn:
3335 VShiftOpc = ARMISD::VSHRN; break;
3336 case Intrinsic::arm_neon_vrshifts:
3337 VShiftOpc = ARMISD::VRSHRs; break;
3338 case Intrinsic::arm_neon_vrshiftu:
3339 VShiftOpc = ARMISD::VRSHRu; break;
3340 case Intrinsic::arm_neon_vrshiftn:
3341 VShiftOpc = ARMISD::VRSHRN; break;
3342 case Intrinsic::arm_neon_vqshifts:
3343 VShiftOpc = ARMISD::VQSHLs; break;
3344 case Intrinsic::arm_neon_vqshiftu:
3345 VShiftOpc = ARMISD::VQSHLu; break;
3346 case Intrinsic::arm_neon_vqshiftsu:
3347 VShiftOpc = ARMISD::VQSHLsu; break;
3348 case Intrinsic::arm_neon_vqshiftns:
3349 VShiftOpc = ARMISD::VQSHRNs; break;
3350 case Intrinsic::arm_neon_vqshiftnu:
3351 VShiftOpc = ARMISD::VQSHRNu; break;
3352 case Intrinsic::arm_neon_vqshiftnsu:
3353 VShiftOpc = ARMISD::VQSHRNsu; break;
3354 case Intrinsic::arm_neon_vqrshiftns:
3355 VShiftOpc = ARMISD::VQRSHRNs; break;
3356 case Intrinsic::arm_neon_vqrshiftnu:
3357 VShiftOpc = ARMISD::VQRSHRNu; break;
3358 case Intrinsic::arm_neon_vqrshiftnsu:
3359 VShiftOpc = ARMISD::VQRSHRNsu; break;
3362 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
3363 N->getOperand(1), DAG.getConstant(Cnt, MVT::i32));
3366 case Intrinsic::arm_neon_vshiftins: {
3367 EVT VT = N->getOperand(1).getValueType();
3369 unsigned VShiftOpc = 0;
3371 if (isVShiftLImm(N->getOperand(3), VT, false, Cnt))
3372 VShiftOpc = ARMISD::VSLI;
3373 else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt))
3374 VShiftOpc = ARMISD::VSRI;
3376 llvm_unreachable("invalid shift count for vsli/vsri intrinsic");
3379 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
3380 N->getOperand(1), N->getOperand(2),
3381 DAG.getConstant(Cnt, MVT::i32));
3384 case Intrinsic::arm_neon_vqrshifts:
3385 case Intrinsic::arm_neon_vqrshiftu:
3386 // No immediate versions of these to check for.
3393 /// PerformShiftCombine - Checks for immediate versions of vector shifts and
3394 /// lowers them. As with the vector shift intrinsics, this is done during DAG
3395 /// combining instead of DAG legalizing because the build_vectors for 64-bit
3396 /// vector element shift counts are generally not legal, and it is hard to see
3397 /// their values after they get legalized to loads from a constant pool.
3398 static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG,
3399 const ARMSubtarget *ST) {
3400 EVT VT = N->getValueType(0);
3402 // Nothing to be done for scalar shifts.
3403 if (! VT.isVector())
3406 assert(ST->hasNEON() && "unexpected vector shift");
3409 switch (N->getOpcode()) {
3410 default: llvm_unreachable("unexpected shift opcode");
3413 if (isVShiftLImm(N->getOperand(1), VT, false, Cnt))
3414 return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0),
3415 DAG.getConstant(Cnt, MVT::i32));
3420 if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) {
3421 unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ?
3422 ARMISD::VSHRs : ARMISD::VSHRu);
3423 return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0),
3424 DAG.getConstant(Cnt, MVT::i32));
3430 /// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND,
3431 /// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND.
3432 static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG,
3433 const ARMSubtarget *ST) {
3434 SDValue N0 = N->getOperand(0);
3436 // Check for sign- and zero-extensions of vector extract operations of 8-
3437 // and 16-bit vector elements. NEON supports these directly. They are
3438 // handled during DAG combining because type legalization will promote them
3439 // to 32-bit types and it is messy to recognize the operations after that.
3440 if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
3441 SDValue Vec = N0.getOperand(0);
3442 SDValue Lane = N0.getOperand(1);
3443 EVT VT = N->getValueType(0);
3444 EVT EltVT = N0.getValueType();
3445 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3447 if (VT == MVT::i32 &&
3448 (EltVT == MVT::i8 || EltVT == MVT::i16) &&
3449 TLI.isTypeLegal(Vec.getValueType())) {
3452 switch (N->getOpcode()) {
3453 default: llvm_unreachable("unexpected opcode");
3454 case ISD::SIGN_EXTEND:
3455 Opc = ARMISD::VGETLANEs;
3457 case ISD::ZERO_EXTEND:
3458 case ISD::ANY_EXTEND:
3459 Opc = ARMISD::VGETLANEu;
3462 return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane);
3469 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
3470 DAGCombinerInfo &DCI) const {
3471 switch (N->getOpcode()) {
3473 case ISD::ADD: return PerformADDCombine(N, DCI);
3474 case ISD::SUB: return PerformSUBCombine(N, DCI);
3475 case ARMISD::VMOVRRD: return PerformVMOVRRDCombine(N, DCI);
3476 case ISD::INTRINSIC_WO_CHAIN:
3477 return PerformIntrinsicCombine(N, DCI.DAG);
3481 return PerformShiftCombine(N, DCI.DAG, Subtarget);
3482 case ISD::SIGN_EXTEND:
3483 case ISD::ZERO_EXTEND:
3484 case ISD::ANY_EXTEND:
3485 return PerformExtendCombine(N, DCI.DAG, Subtarget);
3490 bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
3491 if (!Subtarget->hasV6Ops())
3492 // Pre-v6 does not support unaligned mem access.
3494 else if (!Subtarget->hasV6Ops()) {
3495 // v6 may or may not support unaligned mem access.
3496 if (!Subtarget->isTargetDarwin())
3500 switch (VT.getSimpleVT().SimpleTy) {
3507 // FIXME: VLD1 etc with standard alignment is legal.
3511 static bool isLegalT1AddressImmediate(int64_t V, EVT VT) {
3516 switch (VT.getSimpleVT().SimpleTy) {
3517 default: return false;
3532 if ((V & (Scale - 1)) != 0)
3535 return V == (V & ((1LL << 5) - 1));
3538 static bool isLegalT2AddressImmediate(int64_t V, EVT VT,
3539 const ARMSubtarget *Subtarget) {
3546 switch (VT.getSimpleVT().SimpleTy) {
3547 default: return false;
3552 // + imm12 or - imm8
3554 return V == (V & ((1LL << 8) - 1));
3555 return V == (V & ((1LL << 12) - 1));
3558 // Same as ARM mode. FIXME: NEON?
3559 if (!Subtarget->hasVFP2())
3564 return V == (V & ((1LL << 8) - 1));
3568 /// isLegalAddressImmediate - Return true if the integer value can be used
3569 /// as the offset of the target addressing mode for load / store of the
3571 static bool isLegalAddressImmediate(int64_t V, EVT VT,
3572 const ARMSubtarget *Subtarget) {
3579 if (Subtarget->isThumb1Only())
3580 return isLegalT1AddressImmediate(V, VT);
3581 else if (Subtarget->isThumb2())
3582 return isLegalT2AddressImmediate(V, VT, Subtarget);
3587 switch (VT.getSimpleVT().SimpleTy) {
3588 default: return false;
3593 return V == (V & ((1LL << 12) - 1));
3596 return V == (V & ((1LL << 8) - 1));
3599 if (!Subtarget->hasVFP2()) // FIXME: NEON?
3604 return V == (V & ((1LL << 8) - 1));
3608 bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM,
3610 int Scale = AM.Scale;
3614 switch (VT.getSimpleVT().SimpleTy) {
3615 default: return false;
3624 return Scale == 2 || Scale == 4 || Scale == 8;
3627 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
3631 // Note, we allow "void" uses (basically, uses that aren't loads or
3632 // stores), because arm allows folding a scale into many arithmetic
3633 // operations. This should be made more precise and revisited later.
3635 // Allow r << imm, but the imm has to be a multiple of two.
3636 if (Scale & 1) return false;
3637 return isPowerOf2_32(Scale);
3641 /// isLegalAddressingMode - Return true if the addressing mode represented
3642 /// by AM is legal for this target, for a load/store of the specified type.
3643 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
3644 const Type *Ty) const {
3645 EVT VT = getValueType(Ty, true);
3646 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
3649 // Can never fold addr of global into load/store.
3654 case 0: // no scale reg, must be "r+i" or "r", or "i".
3657 if (Subtarget->isThumb1Only())
3661 // ARM doesn't support any R+R*scale+imm addr modes.
3668 if (Subtarget->isThumb2())
3669 return isLegalT2ScaledAddressingMode(AM, VT);
3671 int Scale = AM.Scale;
3672 switch (VT.getSimpleVT().SimpleTy) {
3673 default: return false;
3677 if (Scale < 0) Scale = -Scale;
3681 return isPowerOf2_32(Scale & ~1);
3685 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
3690 // Note, we allow "void" uses (basically, uses that aren't loads or
3691 // stores), because arm allows folding a scale into many arithmetic
3692 // operations. This should be made more precise and revisited later.
3694 // Allow r << imm, but the imm has to be a multiple of two.
3695 if (Scale & 1) return false;
3696 return isPowerOf2_32(Scale);
3703 /// isLegalICmpImmediate - Return true if the specified immediate is legal
3704 /// icmp immediate, that is the target has icmp instructions which can compare
3705 /// a register against the immediate without having to materialize the
3706 /// immediate into a register.
3707 bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
3708 if (!Subtarget->isThumb())
3709 return ARM_AM::getSOImmVal(Imm) != -1;
3710 if (Subtarget->isThumb2())
3711 return ARM_AM::getT2SOImmVal(Imm) != -1;
3712 return Imm >= 0 && Imm <= 255;
3715 static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT,
3716 bool isSEXTLoad, SDValue &Base,
3717 SDValue &Offset, bool &isInc,
3718 SelectionDAG &DAG) {
3719 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
3722 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
3724 Base = Ptr->getOperand(0);
3725 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3726 int RHSC = (int)RHS->getZExtValue();
3727 if (RHSC < 0 && RHSC > -256) {
3728 assert(Ptr->getOpcode() == ISD::ADD);
3730 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3734 isInc = (Ptr->getOpcode() == ISD::ADD);
3735 Offset = Ptr->getOperand(1);
3737 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
3739 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3740 int RHSC = (int)RHS->getZExtValue();
3741 if (RHSC < 0 && RHSC > -0x1000) {
3742 assert(Ptr->getOpcode() == ISD::ADD);
3744 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3745 Base = Ptr->getOperand(0);
3750 if (Ptr->getOpcode() == ISD::ADD) {
3752 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
3753 if (ShOpcVal != ARM_AM::no_shift) {
3754 Base = Ptr->getOperand(1);
3755 Offset = Ptr->getOperand(0);
3757 Base = Ptr->getOperand(0);
3758 Offset = Ptr->getOperand(1);
3763 isInc = (Ptr->getOpcode() == ISD::ADD);
3764 Base = Ptr->getOperand(0);
3765 Offset = Ptr->getOperand(1);
3769 // FIXME: Use VLDM / VSTM to emulate indexed FP load / store.
3773 static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT,
3774 bool isSEXTLoad, SDValue &Base,
3775 SDValue &Offset, bool &isInc,
3776 SelectionDAG &DAG) {
3777 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
3780 Base = Ptr->getOperand(0);
3781 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3782 int RHSC = (int)RHS->getZExtValue();
3783 if (RHSC < 0 && RHSC > -0x100) { // 8 bits.
3784 assert(Ptr->getOpcode() == ISD::ADD);
3786 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3788 } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero.
3789 isInc = Ptr->getOpcode() == ISD::ADD;
3790 Offset = DAG.getConstant(RHSC, RHS->getValueType(0));
3798 /// getPreIndexedAddressParts - returns true by value, base pointer and
3799 /// offset pointer and addressing mode by reference if the node's address
3800 /// can be legally represented as pre-indexed load / store address.
3802 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
3804 ISD::MemIndexedMode &AM,
3805 SelectionDAG &DAG) const {
3806 if (Subtarget->isThumb1Only())
3811 bool isSEXTLoad = false;
3812 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
3813 Ptr = LD->getBasePtr();
3814 VT = LD->getMemoryVT();
3815 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
3816 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
3817 Ptr = ST->getBasePtr();
3818 VT = ST->getMemoryVT();
3823 bool isLegal = false;
3824 if (Subtarget->isThumb2())
3825 isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
3826 Offset, isInc, DAG);
3828 isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
3829 Offset, isInc, DAG);
3833 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
3837 /// getPostIndexedAddressParts - returns true by value, base pointer and
3838 /// offset pointer and addressing mode by reference if this node can be
3839 /// combined with a load / store to form a post-indexed load / store.
3840 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
3843 ISD::MemIndexedMode &AM,
3844 SelectionDAG &DAG) const {
3845 if (Subtarget->isThumb1Only())
3850 bool isSEXTLoad = false;
3851 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
3852 VT = LD->getMemoryVT();
3853 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
3854 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
3855 VT = ST->getMemoryVT();
3860 bool isLegal = false;
3861 if (Subtarget->isThumb2())
3862 isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
3865 isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
3870 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
3874 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
3878 const SelectionDAG &DAG,
3879 unsigned Depth) const {
3880 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
3881 switch (Op.getOpcode()) {
3883 case ARMISD::CMOV: {
3884 // Bits are known zero/one if known on the LHS and RHS.
3885 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
3886 if (KnownZero == 0 && KnownOne == 0) return;
3888 APInt KnownZeroRHS, KnownOneRHS;
3889 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
3890 KnownZeroRHS, KnownOneRHS, Depth+1);
3891 KnownZero &= KnownZeroRHS;
3892 KnownOne &= KnownOneRHS;
3898 //===----------------------------------------------------------------------===//
3899 // ARM Inline Assembly Support
3900 //===----------------------------------------------------------------------===//
3902 /// getConstraintType - Given a constraint letter, return the type of
3903 /// constraint it is for this target.
3904 ARMTargetLowering::ConstraintType
3905 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
3906 if (Constraint.size() == 1) {
3907 switch (Constraint[0]) {
3909 case 'l': return C_RegisterClass;
3910 case 'w': return C_RegisterClass;
3913 return TargetLowering::getConstraintType(Constraint);
3916 std::pair<unsigned, const TargetRegisterClass*>
3917 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
3919 if (Constraint.size() == 1) {
3920 // GCC RS6000 Constraint Letters
3921 switch (Constraint[0]) {
3923 if (Subtarget->isThumb1Only())
3924 return std::make_pair(0U, ARM::tGPRRegisterClass);
3926 return std::make_pair(0U, ARM::GPRRegisterClass);
3928 return std::make_pair(0U, ARM::GPRRegisterClass);
3931 return std::make_pair(0U, ARM::SPRRegisterClass);
3933 return std::make_pair(0U, ARM::DPRRegisterClass);
3937 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
3940 std::vector<unsigned> ARMTargetLowering::
3941 getRegClassForInlineAsmConstraint(const std::string &Constraint,
3943 if (Constraint.size() != 1)
3944 return std::vector<unsigned>();
3946 switch (Constraint[0]) { // GCC ARM Constraint Letters
3949 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
3950 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
3953 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
3954 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
3955 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
3956 ARM::R12, ARM::LR, 0);
3959 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
3960 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
3961 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
3962 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
3963 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
3964 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
3965 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
3966 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
3968 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
3969 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
3970 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
3971 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
3975 return std::vector<unsigned>();
3978 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
3979 /// vector. If it is invalid, don't add anything to Ops.
3980 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
3983 std::vector<SDValue>&Ops,
3984 SelectionDAG &DAG) const {
3985 SDValue Result(0, 0);
3987 switch (Constraint) {
3989 case 'I': case 'J': case 'K': case 'L':
3990 case 'M': case 'N': case 'O':
3991 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
3995 int64_t CVal64 = C->getSExtValue();
3996 int CVal = (int) CVal64;
3997 // None of these constraints allow values larger than 32 bits. Check
3998 // that the value fits in an int.
4002 switch (Constraint) {
4004 if (Subtarget->isThumb1Only()) {
4005 // This must be a constant between 0 and 255, for ADD
4007 if (CVal >= 0 && CVal <= 255)
4009 } else if (Subtarget->isThumb2()) {
4010 // A constant that can be used as an immediate value in a
4011 // data-processing instruction.
4012 if (ARM_AM::getT2SOImmVal(CVal) != -1)
4015 // A constant that can be used as an immediate value in a
4016 // data-processing instruction.
4017 if (ARM_AM::getSOImmVal(CVal) != -1)
4023 if (Subtarget->isThumb()) { // FIXME thumb2
4024 // This must be a constant between -255 and -1, for negated ADD
4025 // immediates. This can be used in GCC with an "n" modifier that
4026 // prints the negated value, for use with SUB instructions. It is
4027 // not useful otherwise but is implemented for compatibility.
4028 if (CVal >= -255 && CVal <= -1)
4031 // This must be a constant between -4095 and 4095. It is not clear
4032 // what this constraint is intended for. Implemented for
4033 // compatibility with GCC.
4034 if (CVal >= -4095 && CVal <= 4095)
4040 if (Subtarget->isThumb1Only()) {
4041 // A 32-bit value where only one byte has a nonzero value. Exclude
4042 // zero to match GCC. This constraint is used by GCC internally for
4043 // constants that can be loaded with a move/shift combination.
4044 // It is not useful otherwise but is implemented for compatibility.
4045 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
4047 } else if (Subtarget->isThumb2()) {
4048 // A constant whose bitwise inverse can be used as an immediate
4049 // value in a data-processing instruction. This can be used in GCC
4050 // with a "B" modifier that prints the inverted value, for use with
4051 // BIC and MVN instructions. It is not useful otherwise but is
4052 // implemented for compatibility.
4053 if (ARM_AM::getT2SOImmVal(~CVal) != -1)
4056 // A constant whose bitwise inverse can be used as an immediate
4057 // value in a data-processing instruction. This can be used in GCC
4058 // with a "B" modifier that prints the inverted value, for use with
4059 // BIC and MVN instructions. It is not useful otherwise but is
4060 // implemented for compatibility.
4061 if (ARM_AM::getSOImmVal(~CVal) != -1)
4067 if (Subtarget->isThumb1Only()) {
4068 // This must be a constant between -7 and 7,
4069 // for 3-operand ADD/SUB immediate instructions.
4070 if (CVal >= -7 && CVal < 7)
4072 } else if (Subtarget->isThumb2()) {
4073 // A constant whose negation can be used as an immediate value in a
4074 // data-processing instruction. This can be used in GCC with an "n"
4075 // modifier that prints the negated value, for use with SUB
4076 // instructions. It is not useful otherwise but is implemented for
4078 if (ARM_AM::getT2SOImmVal(-CVal) != -1)
4081 // A constant whose negation can be used as an immediate value in a
4082 // data-processing instruction. This can be used in GCC with an "n"
4083 // modifier that prints the negated value, for use with SUB
4084 // instructions. It is not useful otherwise but is implemented for
4086 if (ARM_AM::getSOImmVal(-CVal) != -1)
4092 if (Subtarget->isThumb()) { // FIXME thumb2
4093 // This must be a multiple of 4 between 0 and 1020, for
4094 // ADD sp + immediate.
4095 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
4098 // A power of two or a constant between 0 and 32. This is used in
4099 // GCC for the shift amount on shifted register operands, but it is
4100 // useful in general for any shift amounts.
4101 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
4107 if (Subtarget->isThumb()) { // FIXME thumb2
4108 // This must be a constant between 0 and 31, for shift amounts.
4109 if (CVal >= 0 && CVal <= 31)
4115 if (Subtarget->isThumb()) { // FIXME thumb2
4116 // This must be a multiple of 4 between -508 and 508, for
4117 // ADD/SUB sp = sp + immediate.
4118 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
4123 Result = DAG.getTargetConstant(CVal, Op.getValueType());
4127 if (Result.getNode()) {
4128 Ops.push_back(Result);
4131 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory,
4136 ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
4137 // The ARM target isn't yet aware of offsets.
4141 int ARM::getVFPf32Imm(const APFloat &FPImm) {
4142 APInt Imm = FPImm.bitcastToAPInt();
4143 uint32_t Sign = Imm.lshr(31).getZExtValue() & 1;
4144 int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127
4145 int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits
4147 // We can handle 4 bits of mantissa.
4148 // mantissa = (16+UInt(e:f:g:h))/16.
4149 if (Mantissa & 0x7ffff)
4152 if ((Mantissa & 0xf) != Mantissa)
4155 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
4156 if (Exp < -3 || Exp > 4)
4158 Exp = ((Exp+3) & 0x7) ^ 4;
4160 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
4163 int ARM::getVFPf64Imm(const APFloat &FPImm) {
4164 APInt Imm = FPImm.bitcastToAPInt();
4165 uint64_t Sign = Imm.lshr(63).getZExtValue() & 1;
4166 int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023
4167 uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL;
4169 // We can handle 4 bits of mantissa.
4170 // mantissa = (16+UInt(e:f:g:h))/16.
4171 if (Mantissa & 0xffffffffffffLL)
4174 if ((Mantissa & 0xf) != Mantissa)
4177 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
4178 if (Exp < -3 || Exp > 4)
4180 Exp = ((Exp+3) & 0x7) ^ 4;
4182 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
4185 /// isFPImmLegal - Returns true if the target can instruction select the
4186 /// specified FP immediate natively. If false, the legalizer will
4187 /// materialize the FP immediate as a load from a constant pool.
4188 bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
4189 if (!Subtarget->hasVFP3())
4192 return ARM::getVFPf32Imm(Imm) != -1;
4194 return ARM::getVFPf64Imm(Imm) != -1;