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)), ARMPCLabelIndex(0) {
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 FMRRD, i64 -> f64 to FMDRR 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::FMRRD - 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::FMRRD: return "ARMISD::FMRRD";
497 case ARMISD::FMDRR: return "ARMISD::FMDRR";
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::FMDRR, 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::FMDRR, 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::FMRRD, 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 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1008 GlobalValue *GV = G->getGlobal();
1010 bool isExt = GV->isDeclaration() || GV->isWeakForLinker();
1011 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
1012 getTargetMachine().getRelocationModel() != Reloc::Static;
1013 isARMFunc = !Subtarget->isThumb() || isStub;
1014 // ARM call to a local ARM function is predicable.
1015 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
1016 // tBX takes a register source operand.
1017 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1018 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1021 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1022 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1023 Callee = DAG.getLoad(getPointerTy(), dl,
1024 DAG.getEntryNode(), CPAddr,
1025 PseudoSourceValue::getConstantPool(), 0);
1026 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1027 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1028 getPointerTy(), Callee, PICLabel);
1030 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
1031 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
1033 bool isStub = Subtarget->isTargetDarwin() &&
1034 getTargetMachine().getRelocationModel() != Reloc::Static;
1035 isARMFunc = !Subtarget->isThumb() || isStub;
1036 // tBX takes a register source operand.
1037 const char *Sym = S->getSymbol();
1038 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1039 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1040 Sym, ARMPCLabelIndex, 4);
1041 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1042 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1043 Callee = DAG.getLoad(getPointerTy(), dl,
1044 DAG.getEntryNode(), CPAddr,
1045 PseudoSourceValue::getConstantPool(), 0);
1046 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1047 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1048 getPointerTy(), Callee, PICLabel);
1050 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
1053 // FIXME: handle tail calls differently.
1055 if (Subtarget->isThumb()) {
1056 if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps())
1057 CallOpc = ARMISD::CALL_NOLINK;
1059 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
1061 CallOpc = (isDirect || Subtarget->hasV5TOps())
1062 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
1063 : ARMISD::CALL_NOLINK;
1065 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb1Only()) {
1066 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
1067 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
1068 InFlag = Chain.getValue(1);
1071 std::vector<SDValue> Ops;
1072 Ops.push_back(Chain);
1073 Ops.push_back(Callee);
1075 // Add argument registers to the end of the list so that they are known live
1077 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1078 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1079 RegsToPass[i].second.getValueType()));
1081 if (InFlag.getNode())
1082 Ops.push_back(InFlag);
1083 // Returns a chain and a flag for retval copy to use.
1084 Chain = DAG.getNode(CallOpc, dl, DAG.getVTList(MVT::Other, MVT::Flag),
1085 &Ops[0], Ops.size());
1086 InFlag = Chain.getValue(1);
1088 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1089 DAG.getIntPtrConstant(0, true), InFlag);
1091 InFlag = Chain.getValue(1);
1093 // Handle result values, copying them out of physregs into vregs that we
1095 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins,
1100 ARMTargetLowering::LowerReturn(SDValue Chain,
1101 CallingConv::ID CallConv, bool isVarArg,
1102 const SmallVectorImpl<ISD::OutputArg> &Outs,
1103 DebugLoc dl, SelectionDAG &DAG) {
1105 // CCValAssign - represent the assignment of the return value to a location.
1106 SmallVector<CCValAssign, 16> RVLocs;
1108 // CCState - Info about the registers and stack slots.
1109 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
1112 // Analyze outgoing return values.
1113 CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true,
1116 // If this is the first return lowered for this function, add
1117 // the regs to the liveout set for the function.
1118 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1119 for (unsigned i = 0; i != RVLocs.size(); ++i)
1120 if (RVLocs[i].isRegLoc())
1121 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1126 // Copy the result values into the output registers.
1127 for (unsigned i = 0, realRVLocIdx = 0;
1129 ++i, ++realRVLocIdx) {
1130 CCValAssign &VA = RVLocs[i];
1131 assert(VA.isRegLoc() && "Can only return in registers!");
1133 SDValue Arg = Outs[realRVLocIdx].Val;
1135 switch (VA.getLocInfo()) {
1136 default: llvm_unreachable("Unknown loc info!");
1137 case CCValAssign::Full: break;
1138 case CCValAssign::BCvt:
1139 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1143 if (VA.needsCustom()) {
1144 if (VA.getLocVT() == MVT::v2f64) {
1145 // Extract the first half and return it in two registers.
1146 SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1147 DAG.getConstant(0, MVT::i32));
1148 SDValue HalfGPRs = DAG.getNode(ARMISD::FMRRD, dl,
1149 DAG.getVTList(MVT::i32, MVT::i32), Half);
1151 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag);
1152 Flag = Chain.getValue(1);
1153 VA = RVLocs[++i]; // skip ahead to next loc
1154 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1155 HalfGPRs.getValue(1), Flag);
1156 Flag = Chain.getValue(1);
1157 VA = RVLocs[++i]; // skip ahead to next loc
1159 // Extract the 2nd half and fall through to handle it as an f64 value.
1160 Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1161 DAG.getConstant(1, MVT::i32));
1163 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
1165 SDValue fmrrd = DAG.getNode(ARMISD::FMRRD, dl,
1166 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
1167 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
1168 Flag = Chain.getValue(1);
1169 VA = RVLocs[++i]; // skip ahead to next loc
1170 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
1173 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
1175 // Guarantee that all emitted copies are
1176 // stuck together, avoiding something bad.
1177 Flag = Chain.getValue(1);
1182 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
1184 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
1189 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
1190 // their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
1191 // one of the above mentioned nodes. It has to be wrapped because otherwise
1192 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
1193 // be used to form addressing mode. These wrapped nodes will be selected
1195 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
1196 EVT PtrVT = Op.getValueType();
1197 // FIXME there is no actual debug info here
1198 DebugLoc dl = Op.getDebugLoc();
1199 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1201 if (CP->isMachineConstantPoolEntry())
1202 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
1203 CP->getAlignment());
1205 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
1206 CP->getAlignment());
1207 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
1210 SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) {
1211 DebugLoc DL = Op.getDebugLoc();
1212 EVT PtrVT = getPointerTy();
1213 BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1214 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1216 if (RelocM == Reloc::Static) {
1217 CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4);
1219 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1220 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex,
1221 ARMCP::CPBlockAddress,
1223 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1225 CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr);
1226 SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr,
1227 PseudoSourceValue::getConstantPool(), 0);
1228 if (RelocM == Reloc::Static)
1230 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1231 return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel);
1234 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
1236 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
1237 SelectionDAG &DAG) {
1238 DebugLoc dl = GA->getDebugLoc();
1239 EVT PtrVT = getPointerTy();
1240 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1241 ARMConstantPoolValue *CPV =
1242 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1243 ARMCP::CPValue, PCAdj, "tlsgd", true);
1244 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1245 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
1246 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument,
1247 PseudoSourceValue::getConstantPool(), 0);
1248 SDValue Chain = Argument.getValue(1);
1250 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1251 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
1253 // call __tls_get_addr.
1256 Entry.Node = Argument;
1257 Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext());
1258 Args.push_back(Entry);
1259 // FIXME: is there useful debug info available here?
1260 std::pair<SDValue, SDValue> CallResult =
1261 LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()),
1262 false, false, false, false,
1263 0, CallingConv::C, false, /*isReturnValueUsed=*/true,
1264 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
1265 return CallResult.first;
1268 // Lower ISD::GlobalTLSAddress using the "initial exec" or
1269 // "local exec" model.
1271 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
1272 SelectionDAG &DAG) {
1273 GlobalValue *GV = GA->getGlobal();
1274 DebugLoc dl = GA->getDebugLoc();
1276 SDValue Chain = DAG.getEntryNode();
1277 EVT PtrVT = getPointerTy();
1278 // Get the Thread Pointer
1279 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1281 if (GV->isDeclaration()) {
1282 // initial exec model
1283 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1284 ARMConstantPoolValue *CPV =
1285 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1286 ARMCP::CPValue, PCAdj, "gottpoff", true);
1287 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1288 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1289 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1290 PseudoSourceValue::getConstantPool(), 0);
1291 Chain = Offset.getValue(1);
1293 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1294 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
1296 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1297 PseudoSourceValue::getConstantPool(), 0);
1300 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, "tpoff");
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);
1307 // The address of the thread local variable is the add of the thread
1308 // pointer with the offset of the variable.
1309 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
1313 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) {
1314 // TODO: implement the "local dynamic" model
1315 assert(Subtarget->isTargetELF() &&
1316 "TLS not implemented for non-ELF targets");
1317 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
1318 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
1319 // otherwise use the "Local Exec" TLS Model
1320 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
1321 return LowerToTLSGeneralDynamicModel(GA, DAG);
1323 return LowerToTLSExecModels(GA, DAG);
1326 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
1327 SelectionDAG &DAG) {
1328 EVT PtrVT = getPointerTy();
1329 DebugLoc dl = Op.getDebugLoc();
1330 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1331 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1332 if (RelocM == Reloc::PIC_) {
1333 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
1334 ARMConstantPoolValue *CPV =
1335 new ARMConstantPoolValue(GV, UseGOTOFF ? "GOTOFF" : "GOT");
1336 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1337 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1338 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1340 PseudoSourceValue::getConstantPool(), 0);
1341 SDValue Chain = Result.getValue(1);
1342 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
1343 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
1345 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1346 PseudoSourceValue::getGOT(), 0);
1349 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1350 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1351 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1352 PseudoSourceValue::getConstantPool(), 0);
1356 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
1357 SelectionDAG &DAG) {
1358 EVT PtrVT = getPointerTy();
1359 DebugLoc dl = Op.getDebugLoc();
1360 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1361 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1363 if (RelocM == Reloc::Static)
1364 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1366 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8);
1367 ARMConstantPoolValue *CPV =
1368 new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj);
1369 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1371 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1373 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1374 PseudoSourceValue::getConstantPool(), 0);
1375 SDValue Chain = Result.getValue(1);
1377 if (RelocM == Reloc::PIC_) {
1378 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1379 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1382 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
1383 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1384 PseudoSourceValue::getGOT(), 0);
1389 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
1391 assert(Subtarget->isTargetELF() &&
1392 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
1393 EVT PtrVT = getPointerTy();
1394 DebugLoc dl = Op.getDebugLoc();
1395 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1396 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1397 "_GLOBAL_OFFSET_TABLE_",
1398 ARMPCLabelIndex, PCAdj);
1399 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1400 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1401 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1402 PseudoSourceValue::getConstantPool(), 0);
1403 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1404 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1408 ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
1409 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1410 DebugLoc dl = Op.getDebugLoc();
1412 default: return SDValue(); // Don't custom lower most intrinsics.
1413 case Intrinsic::arm_thread_pointer: {
1414 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1415 return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1417 case Intrinsic::eh_sjlj_lsda: {
1418 MachineFunction &MF = DAG.getMachineFunction();
1419 EVT PtrVT = getPointerTy();
1420 DebugLoc dl = Op.getDebugLoc();
1421 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1423 unsigned PCAdj = (RelocM != Reloc::PIC_)
1424 ? 0 : (Subtarget->isThumb() ? 4 : 8);
1425 ARMConstantPoolValue *CPV =
1426 new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex,
1427 ARMCP::CPLSDA, PCAdj);
1428 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1429 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1431 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1432 PseudoSourceValue::getConstantPool(), 0);
1433 SDValue Chain = Result.getValue(1);
1435 if (RelocM == Reloc::PIC_) {
1436 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1437 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1441 case Intrinsic::eh_sjlj_setjmp:
1442 return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(1));
1446 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
1447 unsigned VarArgsFrameIndex) {
1448 // vastart just stores the address of the VarArgsFrameIndex slot into the
1449 // memory location argument.
1450 DebugLoc dl = Op.getDebugLoc();
1451 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1452 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1453 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1454 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0);
1458 ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) {
1459 SDNode *Node = Op.getNode();
1460 DebugLoc dl = Node->getDebugLoc();
1461 EVT VT = Node->getValueType(0);
1462 SDValue Chain = Op.getOperand(0);
1463 SDValue Size = Op.getOperand(1);
1464 SDValue Align = Op.getOperand(2);
1466 // Chain the dynamic stack allocation so that it doesn't modify the stack
1467 // pointer when other instructions are using the stack.
1468 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1470 unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue();
1471 unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment();
1472 if (AlignVal > StackAlign)
1473 // Do this now since selection pass cannot introduce new target
1474 // independent node.
1475 Align = DAG.getConstant(-(uint64_t)AlignVal, VT);
1477 // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up
1478 // using a "add r, sp, r" instead. Negate the size now so we don't have to
1479 // do even more horrible hack later.
1480 MachineFunction &MF = DAG.getMachineFunction();
1481 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1482 if (AFI->isThumb1OnlyFunction()) {
1484 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size);
1486 uint32_t Val = C->getZExtValue();
1487 if (Val <= 508 && ((Val & 3) == 0))
1491 Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size);
1494 SDVTList VTList = DAG.getVTList(VT, MVT::Other);
1495 SDValue Ops1[] = { Chain, Size, Align };
1496 SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3);
1497 Chain = Res.getValue(1);
1498 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1499 DAG.getIntPtrConstant(0, true), SDValue());
1500 SDValue Ops2[] = { Res, Chain };
1501 return DAG.getMergeValues(Ops2, 2, dl);
1505 ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
1506 SDValue &Root, SelectionDAG &DAG,
1508 MachineFunction &MF = DAG.getMachineFunction();
1509 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1511 TargetRegisterClass *RC;
1512 if (AFI->isThumb1OnlyFunction())
1513 RC = ARM::tGPRRegisterClass;
1515 RC = ARM::GPRRegisterClass;
1517 // Transform the arguments stored in physical registers into virtual ones.
1518 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1519 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1522 if (NextVA.isMemLoc()) {
1523 unsigned ArgSize = NextVA.getLocVT().getSizeInBits()/8;
1524 MachineFrameInfo *MFI = MF.getFrameInfo();
1525 int FI = MFI->CreateFixedObject(ArgSize, NextVA.getLocMemOffset());
1527 // Create load node to retrieve arguments from the stack.
1528 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1529 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN,
1530 PseudoSourceValue::getFixedStack(FI), 0);
1532 Reg = MF.addLiveIn(NextVA.getLocReg(), RC);
1533 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1536 return DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, ArgValue, ArgValue2);
1540 ARMTargetLowering::LowerFormalArguments(SDValue Chain,
1541 CallingConv::ID CallConv, bool isVarArg,
1542 const SmallVectorImpl<ISD::InputArg>
1544 DebugLoc dl, SelectionDAG &DAG,
1545 SmallVectorImpl<SDValue> &InVals) {
1547 MachineFunction &MF = DAG.getMachineFunction();
1548 MachineFrameInfo *MFI = MF.getFrameInfo();
1550 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1552 // Assign locations to all of the incoming arguments.
1553 SmallVector<CCValAssign, 16> ArgLocs;
1554 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1556 CCInfo.AnalyzeFormalArguments(Ins,
1557 CCAssignFnForNode(CallConv, /* Return*/ false,
1560 SmallVector<SDValue, 16> ArgValues;
1562 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1563 CCValAssign &VA = ArgLocs[i];
1565 // Arguments stored in registers.
1566 if (VA.isRegLoc()) {
1567 EVT RegVT = VA.getLocVT();
1570 if (VA.needsCustom()) {
1571 // f64 and vector types are split up into multiple registers or
1572 // combinations of registers and stack slots.
1575 if (VA.getLocVT() == MVT::v2f64) {
1576 SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
1578 VA = ArgLocs[++i]; // skip ahead to next loc
1579 SDValue ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
1581 ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
1582 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
1583 ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
1584 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
1585 ArgValue, ArgValue2, DAG.getIntPtrConstant(1));
1587 ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl);
1590 TargetRegisterClass *RC;
1592 if (RegVT == MVT::f32)
1593 RC = ARM::SPRRegisterClass;
1594 else if (RegVT == MVT::f64)
1595 RC = ARM::DPRRegisterClass;
1596 else if (RegVT == MVT::v2f64)
1597 RC = ARM::QPRRegisterClass;
1598 else if (RegVT == MVT::i32)
1599 RC = (AFI->isThumb1OnlyFunction() ?
1600 ARM::tGPRRegisterClass : ARM::GPRRegisterClass);
1602 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
1604 // Transform the arguments in physical registers into virtual ones.
1605 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1606 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
1609 // If this is an 8 or 16-bit value, it is really passed promoted
1610 // to 32 bits. Insert an assert[sz]ext to capture this, then
1611 // truncate to the right size.
1612 switch (VA.getLocInfo()) {
1613 default: llvm_unreachable("Unknown loc info!");
1614 case CCValAssign::Full: break;
1615 case CCValAssign::BCvt:
1616 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue);
1618 case CCValAssign::SExt:
1619 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
1620 DAG.getValueType(VA.getValVT()));
1621 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1623 case CCValAssign::ZExt:
1624 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
1625 DAG.getValueType(VA.getValVT()));
1626 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1630 InVals.push_back(ArgValue);
1632 } else { // VA.isRegLoc()
1635 assert(VA.isMemLoc());
1636 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
1638 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1639 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset());
1641 // Create load nodes to retrieve arguments from the stack.
1642 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1643 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
1644 PseudoSourceValue::getFixedStack(FI), 0));
1650 static const unsigned GPRArgRegs[] = {
1651 ARM::R0, ARM::R1, ARM::R2, ARM::R3
1654 unsigned NumGPRs = CCInfo.getFirstUnallocated
1655 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
1657 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
1658 unsigned VARegSize = (4 - NumGPRs) * 4;
1659 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
1660 unsigned ArgOffset = CCInfo.getNextStackOffset();
1661 if (VARegSaveSize) {
1662 // If this function is vararg, store any remaining integer argument regs
1663 // to their spots on the stack so that they may be loaded by deferencing
1664 // the result of va_next.
1665 AFI->setVarArgsRegSaveSize(VARegSaveSize);
1666 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
1667 VARegSaveSize - VARegSize);
1668 SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
1670 SmallVector<SDValue, 4> MemOps;
1671 for (; NumGPRs < 4; ++NumGPRs) {
1672 TargetRegisterClass *RC;
1673 if (AFI->isThumb1OnlyFunction())
1674 RC = ARM::tGPRRegisterClass;
1676 RC = ARM::GPRRegisterClass;
1678 unsigned VReg = MF.addLiveIn(GPRArgRegs[NumGPRs], RC);
1679 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
1680 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1681 PseudoSourceValue::getFixedStack(VarArgsFrameIndex), 0);
1682 MemOps.push_back(Store);
1683 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
1684 DAG.getConstant(4, getPointerTy()));
1686 if (!MemOps.empty())
1687 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1688 &MemOps[0], MemOps.size());
1690 // This will point to the next argument passed via stack.
1691 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1697 /// isFloatingPointZero - Return true if this is +0.0.
1698 static bool isFloatingPointZero(SDValue Op) {
1699 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1700 return CFP->getValueAPF().isPosZero();
1701 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
1702 // Maybe this has already been legalized into the constant pool?
1703 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1704 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
1705 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1706 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1707 return CFP->getValueAPF().isPosZero();
1713 static bool isLegalCmpImmediate(unsigned C, bool isThumb1Only) {
1714 return ( isThumb1Only && (C & ~255U) == 0) ||
1715 (!isThumb1Only && ARM_AM::getSOImmVal(C) != -1);
1718 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1719 /// the given operands.
1720 static SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
1721 SDValue &ARMCC, SelectionDAG &DAG, bool isThumb1Only,
1723 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
1724 unsigned C = RHSC->getZExtValue();
1725 if (!isLegalCmpImmediate(C, isThumb1Only)) {
1726 // Constant does not fit, try adjusting it by one?
1731 if (isLegalCmpImmediate(C-1, isThumb1Only)) {
1732 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1733 RHS = DAG.getConstant(C-1, MVT::i32);
1738 if (C > 0 && isLegalCmpImmediate(C-1, isThumb1Only)) {
1739 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1740 RHS = DAG.getConstant(C-1, MVT::i32);
1745 if (isLegalCmpImmediate(C+1, isThumb1Only)) {
1746 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1747 RHS = DAG.getConstant(C+1, MVT::i32);
1752 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb1Only)) {
1753 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1754 RHS = DAG.getConstant(C+1, MVT::i32);
1761 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1762 ARMISD::NodeType CompareType;
1765 CompareType = ARMISD::CMP;
1770 CompareType = ARMISD::CMPZ;
1773 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1774 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
1777 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1778 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
1781 if (!isFloatingPointZero(RHS))
1782 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
1784 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
1785 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
1788 static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG,
1789 const ARMSubtarget *ST) {
1790 EVT VT = Op.getValueType();
1791 SDValue LHS = Op.getOperand(0);
1792 SDValue RHS = Op.getOperand(1);
1793 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1794 SDValue TrueVal = Op.getOperand(2);
1795 SDValue FalseVal = Op.getOperand(3);
1796 DebugLoc dl = Op.getDebugLoc();
1798 if (LHS.getValueType() == MVT::i32) {
1800 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1801 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb1Only(), dl);
1802 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
1805 ARMCC::CondCodes CondCode, CondCode2;
1806 FPCCToARMCC(CC, CondCode, CondCode2);
1808 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1809 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1810 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1811 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
1813 if (CondCode2 != ARMCC::AL) {
1814 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1815 // FIXME: Needs another CMP because flag can have but one use.
1816 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
1817 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
1818 Result, TrueVal, ARMCC2, CCR, Cmp2);
1823 static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG,
1824 const ARMSubtarget *ST) {
1825 SDValue Chain = Op.getOperand(0);
1826 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1827 SDValue LHS = Op.getOperand(2);
1828 SDValue RHS = Op.getOperand(3);
1829 SDValue Dest = Op.getOperand(4);
1830 DebugLoc dl = Op.getDebugLoc();
1832 if (LHS.getValueType() == MVT::i32) {
1834 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1835 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb1Only(), dl);
1836 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
1837 Chain, Dest, ARMCC, CCR,Cmp);
1840 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1841 ARMCC::CondCodes CondCode, CondCode2;
1842 FPCCToARMCC(CC, CondCode, CondCode2);
1844 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1845 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1846 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1847 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1848 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1849 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1850 if (CondCode2 != ARMCC::AL) {
1851 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1852 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1853 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1858 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
1859 SDValue Chain = Op.getOperand(0);
1860 SDValue Table = Op.getOperand(1);
1861 SDValue Index = Op.getOperand(2);
1862 DebugLoc dl = Op.getDebugLoc();
1864 EVT PTy = getPointerTy();
1865 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1866 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1867 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1868 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1869 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
1870 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
1871 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
1872 if (Subtarget->isThumb2()) {
1873 // Thumb2 uses a two-level jump. That is, it jumps into the jump table
1874 // which does another jump to the destination. This also makes it easier
1875 // to translate it to TBB / TBH later.
1876 // FIXME: This might not work if the function is extremely large.
1877 return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain,
1878 Addr, Op.getOperand(2), JTI, UId);
1880 if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
1881 Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr,
1882 PseudoSourceValue::getJumpTable(), 0);
1883 Chain = Addr.getValue(1);
1884 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
1885 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1887 Addr = DAG.getLoad(PTy, dl, Chain, Addr,
1888 PseudoSourceValue::getJumpTable(), 0);
1889 Chain = Addr.getValue(1);
1890 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1894 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
1895 DebugLoc dl = Op.getDebugLoc();
1897 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1898 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
1899 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
1902 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
1903 EVT VT = Op.getValueType();
1904 DebugLoc dl = Op.getDebugLoc();
1906 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1908 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
1909 return DAG.getNode(Opc, dl, VT, Op);
1912 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
1913 // Implement fcopysign with a fabs and a conditional fneg.
1914 SDValue Tmp0 = Op.getOperand(0);
1915 SDValue Tmp1 = Op.getOperand(1);
1916 DebugLoc dl = Op.getDebugLoc();
1917 EVT VT = Op.getValueType();
1918 EVT SrcVT = Tmp1.getValueType();
1919 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
1920 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
1921 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1922 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1923 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1926 SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
1927 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
1928 MFI->setFrameAddressIsTaken(true);
1929 EVT VT = Op.getValueType();
1930 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
1931 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1932 unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin())
1933 ? ARM::R7 : ARM::R11;
1934 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
1936 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0);
1941 ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
1943 SDValue Dst, SDValue Src,
1944 SDValue Size, unsigned Align,
1946 const Value *DstSV, uint64_t DstSVOff,
1947 const Value *SrcSV, uint64_t SrcSVOff){
1948 // Do repeated 4-byte loads and stores. To be improved.
1949 // This requires 4-byte alignment.
1950 if ((Align & 3) != 0)
1952 // This requires the copy size to be a constant, preferrably
1953 // within a subtarget-specific limit.
1954 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
1957 uint64_t SizeVal = ConstantSize->getZExtValue();
1958 if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
1961 unsigned BytesLeft = SizeVal & 3;
1962 unsigned NumMemOps = SizeVal >> 2;
1963 unsigned EmittedNumMemOps = 0;
1965 unsigned VTSize = 4;
1967 const unsigned MAX_LOADS_IN_LDM = 6;
1968 SDValue TFOps[MAX_LOADS_IN_LDM];
1969 SDValue Loads[MAX_LOADS_IN_LDM];
1970 uint64_t SrcOff = 0, DstOff = 0;
1972 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1973 // same number of stores. The loads and stores will get combined into
1974 // ldm/stm later on.
1975 while (EmittedNumMemOps < NumMemOps) {
1977 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1978 Loads[i] = DAG.getLoad(VT, dl, Chain,
1979 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1980 DAG.getConstant(SrcOff, MVT::i32)),
1981 SrcSV, SrcSVOff + SrcOff);
1982 TFOps[i] = Loads[i].getValue(1);
1985 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1988 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1989 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
1990 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
1991 DAG.getConstant(DstOff, MVT::i32)),
1992 DstSV, DstSVOff + DstOff);
1995 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1997 EmittedNumMemOps += i;
2003 // Issue loads / stores for the trailing (1 - 3) bytes.
2004 unsigned BytesLeftSave = BytesLeft;
2007 if (BytesLeft >= 2) {
2015 Loads[i] = DAG.getLoad(VT, dl, Chain,
2016 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
2017 DAG.getConstant(SrcOff, MVT::i32)),
2018 SrcSV, SrcSVOff + SrcOff);
2019 TFOps[i] = Loads[i].getValue(1);
2022 BytesLeft -= VTSize;
2024 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2027 BytesLeft = BytesLeftSave;
2029 if (BytesLeft >= 2) {
2037 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
2038 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
2039 DAG.getConstant(DstOff, MVT::i32)),
2040 DstSV, DstSVOff + DstOff);
2043 BytesLeft -= VTSize;
2045 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
2048 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
2049 SDValue Op = N->getOperand(0);
2050 DebugLoc dl = N->getDebugLoc();
2051 if (N->getValueType(0) == MVT::f64) {
2052 // Turn i64->f64 into FMDRR.
2053 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2054 DAG.getConstant(0, MVT::i32));
2055 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2056 DAG.getConstant(1, MVT::i32));
2057 return DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, Lo, Hi);
2060 // Turn f64->i64 into FMRRD.
2061 SDValue Cvt = DAG.getNode(ARMISD::FMRRD, dl,
2062 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
2064 // Merge the pieces into a single i64 value.
2065 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
2068 /// getZeroVector - Returns a vector of specified type with all zero elements.
2070 static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2071 assert(VT.isVector() && "Expected a vector type");
2073 // Zero vectors are used to represent vector negation and in those cases
2074 // will be implemented with the NEON VNEG instruction. However, VNEG does
2075 // not support i64 elements, so sometimes the zero vectors will need to be
2076 // explicitly constructed. For those cases, and potentially other uses in
2077 // the future, always build zero vectors as <16 x i8> or <8 x i8> bitcasted
2078 // to their dest type. This ensures they get CSE'd.
2080 SDValue Cst = DAG.getTargetConstant(0, MVT::i8);
2081 SmallVector<SDValue, 8> Ops;
2084 if (VT.getSizeInBits() == 64) {
2085 Ops.assign(8, Cst); TVT = MVT::v8i8;
2087 Ops.assign(16, Cst); TVT = MVT::v16i8;
2089 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2091 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2094 /// getOnesVector - Returns a vector of specified type with all bits set.
2096 static SDValue getOnesVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2097 assert(VT.isVector() && "Expected a vector type");
2099 // Always build ones vectors as <16 x i8> or <8 x i8> bitcasted to their
2100 // dest type. This ensures they get CSE'd.
2102 SDValue Cst = DAG.getTargetConstant(0xFF, MVT::i8);
2103 SmallVector<SDValue, 8> Ops;
2106 if (VT.getSizeInBits() == 64) {
2107 Ops.assign(8, Cst); TVT = MVT::v8i8;
2109 Ops.assign(16, Cst); TVT = MVT::v16i8;
2111 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2113 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2116 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
2117 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2118 static SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG,
2119 const ARMSubtarget *ST) {
2120 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2121 EVT VT = Op.getValueType();
2122 unsigned VTBits = VT.getSizeInBits();
2123 DebugLoc dl = Op.getDebugLoc();
2124 SDValue ShOpLo = Op.getOperand(0);
2125 SDValue ShOpHi = Op.getOperand(1);
2126 SDValue ShAmt = Op.getOperand(2);
2128 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
2130 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
2132 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2133 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2134 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
2135 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2136 DAG.getConstant(VTBits, MVT::i32));
2137 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
2138 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2139 SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
2141 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2142 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2143 ARMCC, DAG, ST->isThumb1Only(), dl);
2144 SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
2145 SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC,
2148 SDValue Ops[2] = { Lo, Hi };
2149 return DAG.getMergeValues(Ops, 2, dl);
2152 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
2153 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2154 static SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG,
2155 const ARMSubtarget *ST) {
2156 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2157 EVT VT = Op.getValueType();
2158 unsigned VTBits = VT.getSizeInBits();
2159 DebugLoc dl = Op.getDebugLoc();
2160 SDValue ShOpLo = Op.getOperand(0);
2161 SDValue ShOpHi = Op.getOperand(1);
2162 SDValue ShAmt = Op.getOperand(2);
2165 assert(Op.getOpcode() == ISD::SHL_PARTS);
2166 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2167 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2168 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
2169 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2170 DAG.getConstant(VTBits, MVT::i32));
2171 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
2172 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
2174 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2175 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2176 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2177 ARMCC, DAG, ST->isThumb1Only(), dl);
2178 SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
2179 SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMCC,
2182 SDValue Ops[2] = { Lo, Hi };
2183 return DAG.getMergeValues(Ops, 2, dl);
2186 static SDValue LowerShift(SDNode *N, SelectionDAG &DAG,
2187 const ARMSubtarget *ST) {
2188 EVT VT = N->getValueType(0);
2189 DebugLoc dl = N->getDebugLoc();
2191 // Lower vector shifts on NEON to use VSHL.
2192 if (VT.isVector()) {
2193 assert(ST->hasNEON() && "unexpected vector shift");
2195 // Left shifts translate directly to the vshiftu intrinsic.
2196 if (N->getOpcode() == ISD::SHL)
2197 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2198 DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32),
2199 N->getOperand(0), N->getOperand(1));
2201 assert((N->getOpcode() == ISD::SRA ||
2202 N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode");
2204 // NEON uses the same intrinsics for both left and right shifts. For
2205 // right shifts, the shift amounts are negative, so negate the vector of
2207 EVT ShiftVT = N->getOperand(1).getValueType();
2208 SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT,
2209 getZeroVector(ShiftVT, DAG, dl),
2211 Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ?
2212 Intrinsic::arm_neon_vshifts :
2213 Intrinsic::arm_neon_vshiftu);
2214 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2215 DAG.getConstant(vshiftInt, MVT::i32),
2216 N->getOperand(0), NegatedCount);
2219 // We can get here for a node like i32 = ISD::SHL i32, i64
2223 assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
2224 "Unknown shift to lower!");
2226 // We only lower SRA, SRL of 1 here, all others use generic lowering.
2227 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
2228 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
2231 // If we are in thumb mode, we don't have RRX.
2232 if (ST->isThumb1Only()) return SDValue();
2234 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
2235 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2236 DAG.getConstant(0, MVT::i32));
2237 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2238 DAG.getConstant(1, MVT::i32));
2240 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
2241 // captures the result into a carry flag.
2242 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
2243 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
2245 // The low part is an ARMISD::RRX operand, which shifts the carry in.
2246 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
2248 // Merge the pieces into a single i64 value.
2249 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
2252 static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
2253 SDValue TmpOp0, TmpOp1;
2254 bool Invert = false;
2258 SDValue Op0 = Op.getOperand(0);
2259 SDValue Op1 = Op.getOperand(1);
2260 SDValue CC = Op.getOperand(2);
2261 EVT VT = Op.getValueType();
2262 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
2263 DebugLoc dl = Op.getDebugLoc();
2265 if (Op.getOperand(1).getValueType().isFloatingPoint()) {
2266 switch (SetCCOpcode) {
2267 default: llvm_unreachable("Illegal FP comparison"); break;
2269 case ISD::SETNE: Invert = true; // Fallthrough
2271 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2273 case ISD::SETLT: Swap = true; // Fallthrough
2275 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2277 case ISD::SETLE: Swap = true; // Fallthrough
2279 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2280 case ISD::SETUGE: Swap = true; // Fallthrough
2281 case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break;
2282 case ISD::SETUGT: Swap = true; // Fallthrough
2283 case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break;
2284 case ISD::SETUEQ: Invert = true; // Fallthrough
2286 // Expand this to (OLT | OGT).
2290 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2291 Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1);
2293 case ISD::SETUO: Invert = true; // Fallthrough
2295 // Expand this to (OLT | OGE).
2299 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2300 Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1);
2304 // Integer comparisons.
2305 switch (SetCCOpcode) {
2306 default: llvm_unreachable("Illegal integer comparison"); break;
2307 case ISD::SETNE: Invert = true;
2308 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2309 case ISD::SETLT: Swap = true;
2310 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2311 case ISD::SETLE: Swap = true;
2312 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2313 case ISD::SETULT: Swap = true;
2314 case ISD::SETUGT: Opc = ARMISD::VCGTU; break;
2315 case ISD::SETULE: Swap = true;
2316 case ISD::SETUGE: Opc = ARMISD::VCGEU; break;
2319 // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero).
2320 if (Opc == ARMISD::VCEQ) {
2323 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
2325 else if (ISD::isBuildVectorAllZeros(Op0.getNode()))
2328 // Ignore bitconvert.
2329 if (AndOp.getNode() && AndOp.getOpcode() == ISD::BIT_CONVERT)
2330 AndOp = AndOp.getOperand(0);
2332 if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) {
2334 Op0 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(0));
2335 Op1 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(1));
2342 std::swap(Op0, Op1);
2344 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
2347 Result = DAG.getNOT(dl, Result, VT);
2352 /// isVMOVSplat - Check if the specified splat value corresponds to an immediate
2353 /// VMOV instruction, and if so, return the constant being splatted.
2354 static SDValue isVMOVSplat(uint64_t SplatBits, uint64_t SplatUndef,
2355 unsigned SplatBitSize, SelectionDAG &DAG) {
2356 switch (SplatBitSize) {
2358 // Any 1-byte value is OK.
2359 assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
2360 return DAG.getTargetConstant(SplatBits, MVT::i8);
2363 // NEON's 16-bit VMOV supports splat values where only one byte is nonzero.
2364 if ((SplatBits & ~0xff) == 0 ||
2365 (SplatBits & ~0xff00) == 0)
2366 return DAG.getTargetConstant(SplatBits, MVT::i16);
2370 // NEON's 32-bit VMOV supports splat values where:
2371 // * only one byte is nonzero, or
2372 // * the least significant byte is 0xff and the second byte is nonzero, or
2373 // * the least significant 2 bytes are 0xff and the third is nonzero.
2374 if ((SplatBits & ~0xff) == 0 ||
2375 (SplatBits & ~0xff00) == 0 ||
2376 (SplatBits & ~0xff0000) == 0 ||
2377 (SplatBits & ~0xff000000) == 0)
2378 return DAG.getTargetConstant(SplatBits, MVT::i32);
2380 if ((SplatBits & ~0xffff) == 0 &&
2381 ((SplatBits | SplatUndef) & 0xff) == 0xff)
2382 return DAG.getTargetConstant(SplatBits | 0xff, MVT::i32);
2384 if ((SplatBits & ~0xffffff) == 0 &&
2385 ((SplatBits | SplatUndef) & 0xffff) == 0xffff)
2386 return DAG.getTargetConstant(SplatBits | 0xffff, MVT::i32);
2388 // Note: there are a few 32-bit splat values (specifically: 00ffff00,
2389 // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not
2390 // VMOV.I32. A (very) minor optimization would be to replicate the value
2391 // and fall through here to test for a valid 64-bit splat. But, then the
2392 // caller would also need to check and handle the change in size.
2396 // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff.
2397 uint64_t BitMask = 0xff;
2399 for (int ByteNum = 0; ByteNum < 8; ++ByteNum) {
2400 if (((SplatBits | SplatUndef) & BitMask) == BitMask)
2402 else if ((SplatBits & BitMask) != 0)
2406 return DAG.getTargetConstant(Val, MVT::i64);
2410 llvm_unreachable("unexpected size for isVMOVSplat");
2417 /// getVMOVImm - If this is a build_vector of constants which can be
2418 /// formed by using a VMOV instruction of the specified element size,
2419 /// return the constant being splatted. The ByteSize field indicates the
2420 /// number of bytes of each element [1248].
2421 SDValue ARM::getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
2422 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N);
2423 APInt SplatBits, SplatUndef;
2424 unsigned SplatBitSize;
2426 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
2427 HasAnyUndefs, ByteSize * 8))
2430 if (SplatBitSize > ByteSize * 8)
2433 return isVMOVSplat(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
2437 static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
2438 bool &ReverseVEXT, unsigned &Imm) {
2439 unsigned NumElts = VT.getVectorNumElements();
2440 ReverseVEXT = false;
2443 // If this is a VEXT shuffle, the immediate value is the index of the first
2444 // element. The other shuffle indices must be the successive elements after
2446 unsigned ExpectedElt = Imm;
2447 for (unsigned i = 1; i < NumElts; ++i) {
2448 // Increment the expected index. If it wraps around, it may still be
2449 // a VEXT but the source vectors must be swapped.
2451 if (ExpectedElt == NumElts * 2) {
2456 if (ExpectedElt != static_cast<unsigned>(M[i]))
2460 // Adjust the index value if the source operands will be swapped.
2467 /// isVREVMask - Check if a vector shuffle corresponds to a VREV
2468 /// instruction with the specified blocksize. (The order of the elements
2469 /// within each block of the vector is reversed.)
2470 static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT,
2471 unsigned BlockSize) {
2472 assert((BlockSize==16 || BlockSize==32 || BlockSize==64) &&
2473 "Only possible block sizes for VREV are: 16, 32, 64");
2475 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2479 unsigned NumElts = VT.getVectorNumElements();
2480 unsigned BlockElts = M[0] + 1;
2482 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
2485 for (unsigned i = 0; i < NumElts; ++i) {
2486 if ((unsigned) M[i] !=
2487 (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts))
2494 static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT,
2495 unsigned &WhichResult) {
2496 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2500 unsigned NumElts = VT.getVectorNumElements();
2501 WhichResult = (M[0] == 0 ? 0 : 1);
2502 for (unsigned i = 0; i < NumElts; i += 2) {
2503 if ((unsigned) M[i] != i + WhichResult ||
2504 (unsigned) M[i+1] != i + NumElts + WhichResult)
2510 static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT,
2511 unsigned &WhichResult) {
2512 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2516 unsigned NumElts = VT.getVectorNumElements();
2517 WhichResult = (M[0] == 0 ? 0 : 1);
2518 for (unsigned i = 0; i != NumElts; ++i) {
2519 if ((unsigned) M[i] != 2 * i + WhichResult)
2523 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2524 if (VT.is64BitVector() && EltSz == 32)
2530 static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT,
2531 unsigned &WhichResult) {
2532 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2536 unsigned NumElts = VT.getVectorNumElements();
2537 WhichResult = (M[0] == 0 ? 0 : 1);
2538 unsigned Idx = WhichResult * NumElts / 2;
2539 for (unsigned i = 0; i != NumElts; i += 2) {
2540 if ((unsigned) M[i] != Idx ||
2541 (unsigned) M[i+1] != Idx + NumElts)
2546 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2547 if (VT.is64BitVector() && EltSz == 32)
2553 static SDValue BuildSplat(SDValue Val, EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2554 // Canonicalize all-zeros and all-ones vectors.
2555 ConstantSDNode *ConstVal = cast<ConstantSDNode>(Val.getNode());
2556 if (ConstVal->isNullValue())
2557 return getZeroVector(VT, DAG, dl);
2558 if (ConstVal->isAllOnesValue())
2559 return getOnesVector(VT, DAG, dl);
2562 if (VT.is64BitVector()) {
2563 switch (Val.getValueType().getSizeInBits()) {
2564 case 8: CanonicalVT = MVT::v8i8; break;
2565 case 16: CanonicalVT = MVT::v4i16; break;
2566 case 32: CanonicalVT = MVT::v2i32; break;
2567 case 64: CanonicalVT = MVT::v1i64; break;
2568 default: llvm_unreachable("unexpected splat element type"); break;
2571 assert(VT.is128BitVector() && "unknown splat vector size");
2572 switch (Val.getValueType().getSizeInBits()) {
2573 case 8: CanonicalVT = MVT::v16i8; break;
2574 case 16: CanonicalVT = MVT::v8i16; break;
2575 case 32: CanonicalVT = MVT::v4i32; break;
2576 case 64: CanonicalVT = MVT::v2i64; break;
2577 default: llvm_unreachable("unexpected splat element type"); break;
2581 // Build a canonical splat for this value.
2582 SmallVector<SDValue, 8> Ops;
2583 Ops.assign(CanonicalVT.getVectorNumElements(), Val);
2584 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT, &Ops[0],
2586 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Res);
2589 // If this is a case we can't handle, return null and let the default
2590 // expansion code take care of it.
2591 static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
2592 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
2593 DebugLoc dl = Op.getDebugLoc();
2594 EVT VT = Op.getValueType();
2596 APInt SplatBits, SplatUndef;
2597 unsigned SplatBitSize;
2599 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
2600 if (SplatBitSize <= 64) {
2601 SDValue Val = isVMOVSplat(SplatBits.getZExtValue(),
2602 SplatUndef.getZExtValue(), SplatBitSize, DAG);
2604 return BuildSplat(Val, VT, DAG, dl);
2608 // If there are only 2 elements in a 128-bit vector, insert them into an
2609 // undef vector. This handles the common case for 128-bit vector argument
2610 // passing, where the insertions should be translated to subreg accesses
2611 // with no real instructions.
2612 if (VT.is128BitVector() && Op.getNumOperands() == 2) {
2613 SDValue Val = DAG.getUNDEF(VT);
2614 SDValue Op0 = Op.getOperand(0);
2615 SDValue Op1 = Op.getOperand(1);
2616 if (Op0.getOpcode() != ISD::UNDEF)
2617 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, Op0,
2618 DAG.getIntPtrConstant(0));
2619 if (Op1.getOpcode() != ISD::UNDEF)
2620 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, Op1,
2621 DAG.getIntPtrConstant(1));
2628 /// isShuffleMaskLegal - Targets can use this to indicate that they only
2629 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
2630 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
2631 /// are assumed to be legal.
2633 ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
2635 if (VT.getVectorNumElements() == 4 &&
2636 (VT.is128BitVector() || VT.is64BitVector())) {
2637 unsigned PFIndexes[4];
2638 for (unsigned i = 0; i != 4; ++i) {
2642 PFIndexes[i] = M[i];
2645 // Compute the index in the perfect shuffle table.
2646 unsigned PFTableIndex =
2647 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
2648 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
2649 unsigned Cost = (PFEntry >> 30);
2656 unsigned Imm, WhichResult;
2658 return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
2659 isVREVMask(M, VT, 64) ||
2660 isVREVMask(M, VT, 32) ||
2661 isVREVMask(M, VT, 16) ||
2662 isVEXTMask(M, VT, ReverseVEXT, Imm) ||
2663 isVTRNMask(M, VT, WhichResult) ||
2664 isVUZPMask(M, VT, WhichResult) ||
2665 isVZIPMask(M, VT, WhichResult));
2668 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
2669 /// the specified operations to build the shuffle.
2670 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
2671 SDValue RHS, SelectionDAG &DAG,
2673 unsigned OpNum = (PFEntry >> 26) & 0x0F;
2674 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
2675 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
2678 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
2687 OP_VUZPL, // VUZP, left result
2688 OP_VUZPR, // VUZP, right result
2689 OP_VZIPL, // VZIP, left result
2690 OP_VZIPR, // VZIP, right result
2691 OP_VTRNL, // VTRN, left result
2692 OP_VTRNR // VTRN, right result
2695 if (OpNum == OP_COPY) {
2696 if (LHSID == (1*9+2)*9+3) return LHS;
2697 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
2701 SDValue OpLHS, OpRHS;
2702 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
2703 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
2704 EVT VT = OpLHS.getValueType();
2707 default: llvm_unreachable("Unknown shuffle opcode!");
2709 return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS);
2714 return DAG.getNode(ARMISD::VDUPLANE, dl, VT,
2715 OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32));
2719 return DAG.getNode(ARMISD::VEXT, dl, VT,
2721 DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32));
2724 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
2725 OpLHS, OpRHS).getValue(OpNum-OP_VUZPL);
2728 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
2729 OpLHS, OpRHS).getValue(OpNum-OP_VZIPL);
2732 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
2733 OpLHS, OpRHS).getValue(OpNum-OP_VTRNL);
2737 static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
2738 SDValue V1 = Op.getOperand(0);
2739 SDValue V2 = Op.getOperand(1);
2740 DebugLoc dl = Op.getDebugLoc();
2741 EVT VT = Op.getValueType();
2742 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
2743 SmallVector<int, 8> ShuffleMask;
2745 // Convert shuffles that are directly supported on NEON to target-specific
2746 // DAG nodes, instead of keeping them as shuffles and matching them again
2747 // during code selection. This is more efficient and avoids the possibility
2748 // of inconsistencies between legalization and selection.
2749 // FIXME: floating-point vectors should be canonicalized to integer vectors
2750 // of the same time so that they get CSEd properly.
2751 SVN->getMask(ShuffleMask);
2753 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
2754 int Lane = SVN->getSplatIndex();
2755 // If this is undef splat, generate it via "just" vdup, if possible.
2756 if (Lane == -1) Lane = 0;
2758 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
2759 return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
2761 return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1,
2762 DAG.getConstant(Lane, MVT::i32));
2767 if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) {
2770 return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2,
2771 DAG.getConstant(Imm, MVT::i32));
2774 if (isVREVMask(ShuffleMask, VT, 64))
2775 return DAG.getNode(ARMISD::VREV64, dl, VT, V1);
2776 if (isVREVMask(ShuffleMask, VT, 32))
2777 return DAG.getNode(ARMISD::VREV32, dl, VT, V1);
2778 if (isVREVMask(ShuffleMask, VT, 16))
2779 return DAG.getNode(ARMISD::VREV16, dl, VT, V1);
2781 // Check for Neon shuffles that modify both input vectors in place.
2782 // If both results are used, i.e., if there are two shuffles with the same
2783 // source operands and with masks corresponding to both results of one of
2784 // these operations, DAG memoization will ensure that a single node is
2785 // used for both shuffles.
2786 unsigned WhichResult;
2787 if (isVTRNMask(ShuffleMask, VT, WhichResult))
2788 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
2789 V1, V2).getValue(WhichResult);
2790 if (isVUZPMask(ShuffleMask, VT, WhichResult))
2791 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
2792 V1, V2).getValue(WhichResult);
2793 if (isVZIPMask(ShuffleMask, VT, WhichResult))
2794 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
2795 V1, V2).getValue(WhichResult);
2797 // If the shuffle is not directly supported and it has 4 elements, use
2798 // the PerfectShuffle-generated table to synthesize it from other shuffles.
2799 if (VT.getVectorNumElements() == 4 &&
2800 (VT.is128BitVector() || VT.is64BitVector())) {
2801 unsigned PFIndexes[4];
2802 for (unsigned i = 0; i != 4; ++i) {
2803 if (ShuffleMask[i] < 0)
2806 PFIndexes[i] = ShuffleMask[i];
2809 // Compute the index in the perfect shuffle table.
2810 unsigned PFTableIndex =
2811 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
2813 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
2814 unsigned Cost = (PFEntry >> 30);
2817 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
2823 static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) {
2824 EVT VT = Op.getValueType();
2825 DebugLoc dl = Op.getDebugLoc();
2826 SDValue Vec = Op.getOperand(0);
2827 SDValue Lane = Op.getOperand(1);
2828 assert(VT == MVT::i32 &&
2829 Vec.getValueType().getVectorElementType().getSizeInBits() < 32 &&
2830 "unexpected type for custom-lowering vector extract");
2831 return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane);
2834 static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
2835 // The only time a CONCAT_VECTORS operation can have legal types is when
2836 // two 64-bit vectors are concatenated to a 128-bit vector.
2837 assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 &&
2838 "unexpected CONCAT_VECTORS");
2839 DebugLoc dl = Op.getDebugLoc();
2840 SDValue Val = DAG.getUNDEF(MVT::v2f64);
2841 SDValue Op0 = Op.getOperand(0);
2842 SDValue Op1 = Op.getOperand(1);
2843 if (Op0.getOpcode() != ISD::UNDEF)
2844 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
2845 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op0),
2846 DAG.getIntPtrConstant(0));
2847 if (Op1.getOpcode() != ISD::UNDEF)
2848 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
2849 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op1),
2850 DAG.getIntPtrConstant(1));
2851 return DAG.getNode(ISD::BIT_CONVERT, dl, Op.getValueType(), Val);
2854 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
2855 switch (Op.getOpcode()) {
2856 default: llvm_unreachable("Don't know how to custom lower this!");
2857 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
2858 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
2859 case ISD::GlobalAddress:
2860 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
2861 LowerGlobalAddressELF(Op, DAG);
2862 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
2863 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
2864 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
2865 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
2866 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
2867 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
2868 case ISD::SINT_TO_FP:
2869 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
2870 case ISD::FP_TO_SINT:
2871 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
2872 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
2873 case ISD::RETURNADDR: break;
2874 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
2875 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
2876 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
2877 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
2880 case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget);
2881 case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG, Subtarget);
2882 case ISD::SRL_PARTS:
2883 case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG, Subtarget);
2884 case ISD::VSETCC: return LowerVSETCC(Op, DAG);
2885 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
2886 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
2887 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
2888 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
2893 /// ReplaceNodeResults - Replace the results of node with an illegal result
2894 /// type with new values built out of custom code.
2895 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
2896 SmallVectorImpl<SDValue>&Results,
2897 SelectionDAG &DAG) {
2898 switch (N->getOpcode()) {
2900 llvm_unreachable("Don't know how to custom expand this!");
2902 case ISD::BIT_CONVERT:
2903 Results.push_back(ExpandBIT_CONVERT(N, DAG));
2907 SDValue Res = LowerShift(N, DAG, Subtarget);
2909 Results.push_back(Res);
2915 //===----------------------------------------------------------------------===//
2916 // ARM Scheduler Hooks
2917 //===----------------------------------------------------------------------===//
2920 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
2921 MachineBasicBlock *BB,
2922 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
2923 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
2924 DebugLoc dl = MI->getDebugLoc();
2925 switch (MI->getOpcode()) {
2927 llvm_unreachable("Unexpected instr type to insert");
2928 case ARM::tMOVCCr_pseudo: {
2929 // To "insert" a SELECT_CC instruction, we actually have to insert the
2930 // diamond control-flow pattern. The incoming instruction knows the
2931 // destination vreg to set, the condition code register to branch on, the
2932 // true/false values to select between, and a branch opcode to use.
2933 const BasicBlock *LLVM_BB = BB->getBasicBlock();
2934 MachineFunction::iterator It = BB;
2940 // cmpTY ccX, r1, r2
2942 // fallthrough --> copy0MBB
2943 MachineBasicBlock *thisMBB = BB;
2944 MachineFunction *F = BB->getParent();
2945 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
2946 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
2947 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
2948 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
2949 F->insert(It, copy0MBB);
2950 F->insert(It, sinkMBB);
2951 // Update machine-CFG edges by first adding all successors of the current
2952 // block to the new block which will contain the Phi node for the select.
2953 // Also inform sdisel of the edge changes.
2954 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
2955 E = BB->succ_end(); I != E; ++I) {
2956 EM->insert(std::make_pair(*I, sinkMBB));
2957 sinkMBB->addSuccessor(*I);
2959 // Next, remove all successors of the current block, and add the true
2960 // and fallthrough blocks as its successors.
2961 while (!BB->succ_empty())
2962 BB->removeSuccessor(BB->succ_begin());
2963 BB->addSuccessor(copy0MBB);
2964 BB->addSuccessor(sinkMBB);
2967 // %FalseValue = ...
2968 // # fallthrough to sinkMBB
2971 // Update machine-CFG edges
2972 BB->addSuccessor(sinkMBB);
2975 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
2978 BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg())
2979 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
2980 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
2982 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
2989 case ARM::t2SUBrSPi_:
2990 case ARM::t2SUBrSPi12_:
2991 case ARM::t2SUBrSPs_: {
2992 MachineFunction *MF = BB->getParent();
2993 unsigned DstReg = MI->getOperand(0).getReg();
2994 unsigned SrcReg = MI->getOperand(1).getReg();
2995 bool DstIsDead = MI->getOperand(0).isDead();
2996 bool SrcIsKill = MI->getOperand(1).isKill();
2998 if (SrcReg != ARM::SP) {
2999 // Copy the source to SP from virtual register.
3000 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg);
3001 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3002 ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr;
3003 BuildMI(BB, dl, TII->get(CopyOpc), ARM::SP)
3004 .addReg(SrcReg, getKillRegState(SrcIsKill));
3008 bool NeedPred = false, NeedCC = false, NeedOp3 = false;
3009 switch (MI->getOpcode()) {
3011 llvm_unreachable("Unexpected pseudo instruction!");
3017 OpOpc = ARM::tADDspr;
3020 OpOpc = ARM::tSUBspi;
3022 case ARM::t2SUBrSPi_:
3023 OpOpc = ARM::t2SUBrSPi;
3024 NeedPred = true; NeedCC = true;
3026 case ARM::t2SUBrSPi12_:
3027 OpOpc = ARM::t2SUBrSPi12;
3030 case ARM::t2SUBrSPs_:
3031 OpOpc = ARM::t2SUBrSPs;
3032 NeedPred = true; NeedCC = true; NeedOp3 = true;
3035 MachineInstrBuilder MIB = BuildMI(BB, dl, TII->get(OpOpc), ARM::SP);
3036 if (OpOpc == ARM::tAND)
3037 AddDefaultT1CC(MIB);
3038 MIB.addReg(ARM::SP);
3039 MIB.addOperand(MI->getOperand(2));
3041 MIB.addOperand(MI->getOperand(3));
3043 AddDefaultPred(MIB);
3047 // Copy the result from SP to virtual register.
3048 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg);
3049 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3050 ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr;
3051 BuildMI(BB, dl, TII->get(CopyOpc))
3052 .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
3054 MF->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
3060 //===----------------------------------------------------------------------===//
3061 // ARM Optimization Hooks
3062 //===----------------------------------------------------------------------===//
3065 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
3066 TargetLowering::DAGCombinerInfo &DCI) {
3067 SelectionDAG &DAG = DCI.DAG;
3068 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3069 EVT VT = N->getValueType(0);
3070 unsigned Opc = N->getOpcode();
3071 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
3072 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
3073 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
3074 ISD::CondCode CC = ISD::SETCC_INVALID;
3077 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
3079 SDValue CCOp = Slct.getOperand(0);
3080 if (CCOp.getOpcode() == ISD::SETCC)
3081 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
3084 bool DoXform = false;
3086 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
3089 if (LHS.getOpcode() == ISD::Constant &&
3090 cast<ConstantSDNode>(LHS)->isNullValue()) {
3092 } else if (CC != ISD::SETCC_INVALID &&
3093 RHS.getOpcode() == ISD::Constant &&
3094 cast<ConstantSDNode>(RHS)->isNullValue()) {
3095 std::swap(LHS, RHS);
3096 SDValue Op0 = Slct.getOperand(0);
3097 EVT OpVT = isSlctCC ? Op0.getValueType() :
3098 Op0.getOperand(0).getValueType();
3099 bool isInt = OpVT.isInteger();
3100 CC = ISD::getSetCCInverse(CC, isInt);
3102 if (!TLI.isCondCodeLegal(CC, OpVT))
3103 return SDValue(); // Inverse operator isn't legal.
3110 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
3112 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
3113 Slct.getOperand(0), Slct.getOperand(1), CC);
3114 SDValue CCOp = Slct.getOperand(0);
3116 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
3117 CCOp.getOperand(0), CCOp.getOperand(1), CC);
3118 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
3119 CCOp, OtherOp, Result);
3124 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
3125 static SDValue PerformADDCombine(SDNode *N,
3126 TargetLowering::DAGCombinerInfo &DCI) {
3127 // added by evan in r37685 with no testcase.
3128 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3130 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
3131 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
3132 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
3133 if (Result.getNode()) return Result;
3135 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3136 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3137 if (Result.getNode()) return Result;
3143 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
3144 static SDValue PerformSUBCombine(SDNode *N,
3145 TargetLowering::DAGCombinerInfo &DCI) {
3146 // added by evan in r37685 with no testcase.
3147 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3149 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
3150 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3151 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3152 if (Result.getNode()) return Result;
3158 /// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
3159 static SDValue PerformFMRRDCombine(SDNode *N,
3160 TargetLowering::DAGCombinerInfo &DCI) {
3161 // fmrrd(fmdrr x, y) -> x,y
3162 SDValue InDouble = N->getOperand(0);
3163 if (InDouble.getOpcode() == ARMISD::FMDRR)
3164 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
3168 /// getVShiftImm - Check if this is a valid build_vector for the immediate
3169 /// operand of a vector shift operation, where all the elements of the
3170 /// build_vector must have the same constant integer value.
3171 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
3172 // Ignore bit_converts.
3173 while (Op.getOpcode() == ISD::BIT_CONVERT)
3174 Op = Op.getOperand(0);
3175 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
3176 APInt SplatBits, SplatUndef;
3177 unsigned SplatBitSize;
3179 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
3180 HasAnyUndefs, ElementBits) ||
3181 SplatBitSize > ElementBits)
3183 Cnt = SplatBits.getSExtValue();
3187 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
3188 /// operand of a vector shift left operation. That value must be in the range:
3189 /// 0 <= Value < ElementBits for a left shift; or
3190 /// 0 <= Value <= ElementBits for a long left shift.
3191 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
3192 assert(VT.isVector() && "vector shift count is not a vector type");
3193 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
3194 if (! getVShiftImm(Op, ElementBits, Cnt))
3196 return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits);
3199 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
3200 /// operand of a vector shift right operation. For a shift opcode, the value
3201 /// is positive, but for an intrinsic the value count must be negative. The
3202 /// absolute value must be in the range:
3203 /// 1 <= |Value| <= ElementBits for a right shift; or
3204 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
3205 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
3207 assert(VT.isVector() && "vector shift count is not a vector type");
3208 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
3209 if (! getVShiftImm(Op, ElementBits, Cnt))
3213 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits));
3216 /// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics.
3217 static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) {
3218 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
3221 // Don't do anything for most intrinsics.
3224 // Vector shifts: check for immediate versions and lower them.
3225 // Note: This is done during DAG combining instead of DAG legalizing because
3226 // the build_vectors for 64-bit vector element shift counts are generally
3227 // not legal, and it is hard to see their values after they get legalized to
3228 // loads from a constant pool.
3229 case Intrinsic::arm_neon_vshifts:
3230 case Intrinsic::arm_neon_vshiftu:
3231 case Intrinsic::arm_neon_vshiftls:
3232 case Intrinsic::arm_neon_vshiftlu:
3233 case Intrinsic::arm_neon_vshiftn:
3234 case Intrinsic::arm_neon_vrshifts:
3235 case Intrinsic::arm_neon_vrshiftu:
3236 case Intrinsic::arm_neon_vrshiftn:
3237 case Intrinsic::arm_neon_vqshifts:
3238 case Intrinsic::arm_neon_vqshiftu:
3239 case Intrinsic::arm_neon_vqshiftsu:
3240 case Intrinsic::arm_neon_vqshiftns:
3241 case Intrinsic::arm_neon_vqshiftnu:
3242 case Intrinsic::arm_neon_vqshiftnsu:
3243 case Intrinsic::arm_neon_vqrshiftns:
3244 case Intrinsic::arm_neon_vqrshiftnu:
3245 case Intrinsic::arm_neon_vqrshiftnsu: {
3246 EVT VT = N->getOperand(1).getValueType();
3248 unsigned VShiftOpc = 0;
3251 case Intrinsic::arm_neon_vshifts:
3252 case Intrinsic::arm_neon_vshiftu:
3253 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) {
3254 VShiftOpc = ARMISD::VSHL;
3257 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) {
3258 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ?
3259 ARMISD::VSHRs : ARMISD::VSHRu);
3264 case Intrinsic::arm_neon_vshiftls:
3265 case Intrinsic::arm_neon_vshiftlu:
3266 if (isVShiftLImm(N->getOperand(2), VT, true, Cnt))
3268 llvm_unreachable("invalid shift count for vshll intrinsic");
3270 case Intrinsic::arm_neon_vrshifts:
3271 case Intrinsic::arm_neon_vrshiftu:
3272 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt))
3276 case Intrinsic::arm_neon_vqshifts:
3277 case Intrinsic::arm_neon_vqshiftu:
3278 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
3282 case Intrinsic::arm_neon_vqshiftsu:
3283 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
3285 llvm_unreachable("invalid shift count for vqshlu intrinsic");
3287 case Intrinsic::arm_neon_vshiftn:
3288 case Intrinsic::arm_neon_vrshiftn:
3289 case Intrinsic::arm_neon_vqshiftns:
3290 case Intrinsic::arm_neon_vqshiftnu:
3291 case Intrinsic::arm_neon_vqshiftnsu:
3292 case Intrinsic::arm_neon_vqrshiftns:
3293 case Intrinsic::arm_neon_vqrshiftnu:
3294 case Intrinsic::arm_neon_vqrshiftnsu:
3295 // Narrowing shifts require an immediate right shift.
3296 if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt))
3298 llvm_unreachable("invalid shift count for narrowing vector shift intrinsic");
3301 llvm_unreachable("unhandled vector shift");
3305 case Intrinsic::arm_neon_vshifts:
3306 case Intrinsic::arm_neon_vshiftu:
3307 // Opcode already set above.
3309 case Intrinsic::arm_neon_vshiftls:
3310 case Intrinsic::arm_neon_vshiftlu:
3311 if (Cnt == VT.getVectorElementType().getSizeInBits())
3312 VShiftOpc = ARMISD::VSHLLi;
3314 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ?
3315 ARMISD::VSHLLs : ARMISD::VSHLLu);
3317 case Intrinsic::arm_neon_vshiftn:
3318 VShiftOpc = ARMISD::VSHRN; break;
3319 case Intrinsic::arm_neon_vrshifts:
3320 VShiftOpc = ARMISD::VRSHRs; break;
3321 case Intrinsic::arm_neon_vrshiftu:
3322 VShiftOpc = ARMISD::VRSHRu; break;
3323 case Intrinsic::arm_neon_vrshiftn:
3324 VShiftOpc = ARMISD::VRSHRN; break;
3325 case Intrinsic::arm_neon_vqshifts:
3326 VShiftOpc = ARMISD::VQSHLs; break;
3327 case Intrinsic::arm_neon_vqshiftu:
3328 VShiftOpc = ARMISD::VQSHLu; break;
3329 case Intrinsic::arm_neon_vqshiftsu:
3330 VShiftOpc = ARMISD::VQSHLsu; break;
3331 case Intrinsic::arm_neon_vqshiftns:
3332 VShiftOpc = ARMISD::VQSHRNs; break;
3333 case Intrinsic::arm_neon_vqshiftnu:
3334 VShiftOpc = ARMISD::VQSHRNu; break;
3335 case Intrinsic::arm_neon_vqshiftnsu:
3336 VShiftOpc = ARMISD::VQSHRNsu; break;
3337 case Intrinsic::arm_neon_vqrshiftns:
3338 VShiftOpc = ARMISD::VQRSHRNs; break;
3339 case Intrinsic::arm_neon_vqrshiftnu:
3340 VShiftOpc = ARMISD::VQRSHRNu; break;
3341 case Intrinsic::arm_neon_vqrshiftnsu:
3342 VShiftOpc = ARMISD::VQRSHRNsu; break;
3345 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
3346 N->getOperand(1), DAG.getConstant(Cnt, MVT::i32));
3349 case Intrinsic::arm_neon_vshiftins: {
3350 EVT VT = N->getOperand(1).getValueType();
3352 unsigned VShiftOpc = 0;
3354 if (isVShiftLImm(N->getOperand(3), VT, false, Cnt))
3355 VShiftOpc = ARMISD::VSLI;
3356 else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt))
3357 VShiftOpc = ARMISD::VSRI;
3359 llvm_unreachable("invalid shift count for vsli/vsri intrinsic");
3362 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
3363 N->getOperand(1), N->getOperand(2),
3364 DAG.getConstant(Cnt, MVT::i32));
3367 case Intrinsic::arm_neon_vqrshifts:
3368 case Intrinsic::arm_neon_vqrshiftu:
3369 // No immediate versions of these to check for.
3376 /// PerformShiftCombine - Checks for immediate versions of vector shifts and
3377 /// lowers them. As with the vector shift intrinsics, this is done during DAG
3378 /// combining instead of DAG legalizing because the build_vectors for 64-bit
3379 /// vector element shift counts are generally not legal, and it is hard to see
3380 /// their values after they get legalized to loads from a constant pool.
3381 static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG,
3382 const ARMSubtarget *ST) {
3383 EVT VT = N->getValueType(0);
3385 // Nothing to be done for scalar shifts.
3386 if (! VT.isVector())
3389 assert(ST->hasNEON() && "unexpected vector shift");
3392 switch (N->getOpcode()) {
3393 default: llvm_unreachable("unexpected shift opcode");
3396 if (isVShiftLImm(N->getOperand(1), VT, false, Cnt))
3397 return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0),
3398 DAG.getConstant(Cnt, MVT::i32));
3403 if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) {
3404 unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ?
3405 ARMISD::VSHRs : ARMISD::VSHRu);
3406 return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0),
3407 DAG.getConstant(Cnt, MVT::i32));
3413 /// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND,
3414 /// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND.
3415 static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG,
3416 const ARMSubtarget *ST) {
3417 SDValue N0 = N->getOperand(0);
3419 // Check for sign- and zero-extensions of vector extract operations of 8-
3420 // and 16-bit vector elements. NEON supports these directly. They are
3421 // handled during DAG combining because type legalization will promote them
3422 // to 32-bit types and it is messy to recognize the operations after that.
3423 if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
3424 SDValue Vec = N0.getOperand(0);
3425 SDValue Lane = N0.getOperand(1);
3426 EVT VT = N->getValueType(0);
3427 EVT EltVT = N0.getValueType();
3428 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3430 if (VT == MVT::i32 &&
3431 (EltVT == MVT::i8 || EltVT == MVT::i16) &&
3432 TLI.isTypeLegal(Vec.getValueType())) {
3435 switch (N->getOpcode()) {
3436 default: llvm_unreachable("unexpected opcode");
3437 case ISD::SIGN_EXTEND:
3438 Opc = ARMISD::VGETLANEs;
3440 case ISD::ZERO_EXTEND:
3441 case ISD::ANY_EXTEND:
3442 Opc = ARMISD::VGETLANEu;
3445 return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane);
3452 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
3453 DAGCombinerInfo &DCI) const {
3454 switch (N->getOpcode()) {
3456 case ISD::ADD: return PerformADDCombine(N, DCI);
3457 case ISD::SUB: return PerformSUBCombine(N, DCI);
3458 case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
3459 case ISD::INTRINSIC_WO_CHAIN:
3460 return PerformIntrinsicCombine(N, DCI.DAG);
3464 return PerformShiftCombine(N, DCI.DAG, Subtarget);
3465 case ISD::SIGN_EXTEND:
3466 case ISD::ZERO_EXTEND:
3467 case ISD::ANY_EXTEND:
3468 return PerformExtendCombine(N, DCI.DAG, Subtarget);
3473 bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
3474 if (!Subtarget->hasV6Ops())
3475 // Pre-v6 does not support unaligned mem access.
3477 else if (!Subtarget->hasV6Ops()) {
3478 // v6 may or may not support unaligned mem access.
3479 if (!Subtarget->isTargetDarwin())
3483 switch (VT.getSimpleVT().SimpleTy) {
3490 // FIXME: VLD1 etc with standard alignment is legal.
3494 static bool isLegalT1AddressImmediate(int64_t V, EVT VT) {
3499 switch (VT.getSimpleVT().SimpleTy) {
3500 default: return false;
3515 if ((V & (Scale - 1)) != 0)
3518 return V == (V & ((1LL << 5) - 1));
3521 static bool isLegalT2AddressImmediate(int64_t V, EVT VT,
3522 const ARMSubtarget *Subtarget) {
3529 switch (VT.getSimpleVT().SimpleTy) {
3530 default: return false;
3535 // + imm12 or - imm8
3537 return V == (V & ((1LL << 8) - 1));
3538 return V == (V & ((1LL << 12) - 1));
3541 // Same as ARM mode. FIXME: NEON?
3542 if (!Subtarget->hasVFP2())
3547 return V == (V & ((1LL << 8) - 1));
3551 /// isLegalAddressImmediate - Return true if the integer value can be used
3552 /// as the offset of the target addressing mode for load / store of the
3554 static bool isLegalAddressImmediate(int64_t V, EVT VT,
3555 const ARMSubtarget *Subtarget) {
3562 if (Subtarget->isThumb1Only())
3563 return isLegalT1AddressImmediate(V, VT);
3564 else if (Subtarget->isThumb2())
3565 return isLegalT2AddressImmediate(V, VT, Subtarget);
3570 switch (VT.getSimpleVT().SimpleTy) {
3571 default: return false;
3576 return V == (V & ((1LL << 12) - 1));
3579 return V == (V & ((1LL << 8) - 1));
3582 if (!Subtarget->hasVFP2()) // FIXME: NEON?
3587 return V == (V & ((1LL << 8) - 1));
3591 bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM,
3593 int Scale = AM.Scale;
3597 switch (VT.getSimpleVT().SimpleTy) {
3598 default: return false;
3607 return Scale == 2 || Scale == 4 || Scale == 8;
3610 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
3614 // Note, we allow "void" uses (basically, uses that aren't loads or
3615 // stores), because arm allows folding a scale into many arithmetic
3616 // operations. This should be made more precise and revisited later.
3618 // Allow r << imm, but the imm has to be a multiple of two.
3619 if (Scale & 1) return false;
3620 return isPowerOf2_32(Scale);
3624 /// isLegalAddressingMode - Return true if the addressing mode represented
3625 /// by AM is legal for this target, for a load/store of the specified type.
3626 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
3627 const Type *Ty) const {
3628 EVT VT = getValueType(Ty, true);
3629 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
3632 // Can never fold addr of global into load/store.
3637 case 0: // no scale reg, must be "r+i" or "r", or "i".
3640 if (Subtarget->isThumb1Only())
3644 // ARM doesn't support any R+R*scale+imm addr modes.
3651 if (Subtarget->isThumb2())
3652 return isLegalT2ScaledAddressingMode(AM, VT);
3654 int Scale = AM.Scale;
3655 switch (VT.getSimpleVT().SimpleTy) {
3656 default: return false;
3660 if (Scale < 0) Scale = -Scale;
3664 return isPowerOf2_32(Scale & ~1);
3668 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
3673 // Note, we allow "void" uses (basically, uses that aren't loads or
3674 // stores), because arm allows folding a scale into many arithmetic
3675 // operations. This should be made more precise and revisited later.
3677 // Allow r << imm, but the imm has to be a multiple of two.
3678 if (Scale & 1) return false;
3679 return isPowerOf2_32(Scale);
3686 static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT,
3687 bool isSEXTLoad, SDValue &Base,
3688 SDValue &Offset, bool &isInc,
3689 SelectionDAG &DAG) {
3690 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
3693 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
3695 Base = Ptr->getOperand(0);
3696 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3697 int RHSC = (int)RHS->getZExtValue();
3698 if (RHSC < 0 && RHSC > -256) {
3699 assert(Ptr->getOpcode() == ISD::ADD);
3701 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3705 isInc = (Ptr->getOpcode() == ISD::ADD);
3706 Offset = Ptr->getOperand(1);
3708 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
3710 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3711 int RHSC = (int)RHS->getZExtValue();
3712 if (RHSC < 0 && RHSC > -0x1000) {
3713 assert(Ptr->getOpcode() == ISD::ADD);
3715 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3716 Base = Ptr->getOperand(0);
3721 if (Ptr->getOpcode() == ISD::ADD) {
3723 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
3724 if (ShOpcVal != ARM_AM::no_shift) {
3725 Base = Ptr->getOperand(1);
3726 Offset = Ptr->getOperand(0);
3728 Base = Ptr->getOperand(0);
3729 Offset = Ptr->getOperand(1);
3734 isInc = (Ptr->getOpcode() == ISD::ADD);
3735 Base = Ptr->getOperand(0);
3736 Offset = Ptr->getOperand(1);
3740 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
3744 static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT,
3745 bool isSEXTLoad, SDValue &Base,
3746 SDValue &Offset, bool &isInc,
3747 SelectionDAG &DAG) {
3748 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
3751 Base = Ptr->getOperand(0);
3752 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
3753 int RHSC = (int)RHS->getZExtValue();
3754 if (RHSC < 0 && RHSC > -0x100) { // 8 bits.
3755 assert(Ptr->getOpcode() == ISD::ADD);
3757 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
3759 } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero.
3760 isInc = Ptr->getOpcode() == ISD::ADD;
3761 Offset = DAG.getConstant(RHSC, RHS->getValueType(0));
3769 /// getPreIndexedAddressParts - returns true by value, base pointer and
3770 /// offset pointer and addressing mode by reference if the node's address
3771 /// can be legally represented as pre-indexed load / store address.
3773 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
3775 ISD::MemIndexedMode &AM,
3776 SelectionDAG &DAG) const {
3777 if (Subtarget->isThumb1Only())
3782 bool isSEXTLoad = false;
3783 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
3784 Ptr = LD->getBasePtr();
3785 VT = LD->getMemoryVT();
3786 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
3787 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
3788 Ptr = ST->getBasePtr();
3789 VT = ST->getMemoryVT();
3794 bool isLegal = false;
3795 if (Subtarget->isThumb2())
3796 isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
3797 Offset, isInc, DAG);
3799 isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
3800 Offset, isInc, DAG);
3804 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
3808 /// getPostIndexedAddressParts - returns true by value, base pointer and
3809 /// offset pointer and addressing mode by reference if this node can be
3810 /// combined with a load / store to form a post-indexed load / store.
3811 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
3814 ISD::MemIndexedMode &AM,
3815 SelectionDAG &DAG) const {
3816 if (Subtarget->isThumb1Only())
3821 bool isSEXTLoad = false;
3822 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
3823 VT = LD->getMemoryVT();
3824 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
3825 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
3826 VT = ST->getMemoryVT();
3831 bool isLegal = false;
3832 if (Subtarget->isThumb2())
3833 isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
3836 isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
3841 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
3845 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
3849 const SelectionDAG &DAG,
3850 unsigned Depth) const {
3851 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
3852 switch (Op.getOpcode()) {
3854 case ARMISD::CMOV: {
3855 // Bits are known zero/one if known on the LHS and RHS.
3856 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
3857 if (KnownZero == 0 && KnownOne == 0) return;
3859 APInt KnownZeroRHS, KnownOneRHS;
3860 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
3861 KnownZeroRHS, KnownOneRHS, Depth+1);
3862 KnownZero &= KnownZeroRHS;
3863 KnownOne &= KnownOneRHS;
3869 //===----------------------------------------------------------------------===//
3870 // ARM Inline Assembly Support
3871 //===----------------------------------------------------------------------===//
3873 /// getConstraintType - Given a constraint letter, return the type of
3874 /// constraint it is for this target.
3875 ARMTargetLowering::ConstraintType
3876 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
3877 if (Constraint.size() == 1) {
3878 switch (Constraint[0]) {
3880 case 'l': return C_RegisterClass;
3881 case 'w': return C_RegisterClass;
3884 return TargetLowering::getConstraintType(Constraint);
3887 std::pair<unsigned, const TargetRegisterClass*>
3888 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
3890 if (Constraint.size() == 1) {
3891 // GCC RS6000 Constraint Letters
3892 switch (Constraint[0]) {
3894 if (Subtarget->isThumb1Only())
3895 return std::make_pair(0U, ARM::tGPRRegisterClass);
3897 return std::make_pair(0U, ARM::GPRRegisterClass);
3899 return std::make_pair(0U, ARM::GPRRegisterClass);
3902 return std::make_pair(0U, ARM::SPRRegisterClass);
3904 return std::make_pair(0U, ARM::DPRRegisterClass);
3908 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
3911 std::vector<unsigned> ARMTargetLowering::
3912 getRegClassForInlineAsmConstraint(const std::string &Constraint,
3914 if (Constraint.size() != 1)
3915 return std::vector<unsigned>();
3917 switch (Constraint[0]) { // GCC ARM Constraint Letters
3920 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
3921 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
3924 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
3925 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
3926 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
3927 ARM::R12, ARM::LR, 0);
3930 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
3931 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
3932 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
3933 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
3934 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
3935 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
3936 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
3937 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
3939 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
3940 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
3941 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
3942 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
3946 return std::vector<unsigned>();
3949 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
3950 /// vector. If it is invalid, don't add anything to Ops.
3951 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
3954 std::vector<SDValue>&Ops,
3955 SelectionDAG &DAG) const {
3956 SDValue Result(0, 0);
3958 switch (Constraint) {
3960 case 'I': case 'J': case 'K': case 'L':
3961 case 'M': case 'N': case 'O':
3962 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
3966 int64_t CVal64 = C->getSExtValue();
3967 int CVal = (int) CVal64;
3968 // None of these constraints allow values larger than 32 bits. Check
3969 // that the value fits in an int.
3973 switch (Constraint) {
3975 if (Subtarget->isThumb1Only()) {
3976 // This must be a constant between 0 and 255, for ADD
3978 if (CVal >= 0 && CVal <= 255)
3980 } else if (Subtarget->isThumb2()) {
3981 // A constant that can be used as an immediate value in a
3982 // data-processing instruction.
3983 if (ARM_AM::getT2SOImmVal(CVal) != -1)
3986 // A constant that can be used as an immediate value in a
3987 // data-processing instruction.
3988 if (ARM_AM::getSOImmVal(CVal) != -1)
3994 if (Subtarget->isThumb()) { // FIXME thumb2
3995 // This must be a constant between -255 and -1, for negated ADD
3996 // immediates. This can be used in GCC with an "n" modifier that
3997 // prints the negated value, for use with SUB instructions. It is
3998 // not useful otherwise but is implemented for compatibility.
3999 if (CVal >= -255 && CVal <= -1)
4002 // This must be a constant between -4095 and 4095. It is not clear
4003 // what this constraint is intended for. Implemented for
4004 // compatibility with GCC.
4005 if (CVal >= -4095 && CVal <= 4095)
4011 if (Subtarget->isThumb1Only()) {
4012 // A 32-bit value where only one byte has a nonzero value. Exclude
4013 // zero to match GCC. This constraint is used by GCC internally for
4014 // constants that can be loaded with a move/shift combination.
4015 // It is not useful otherwise but is implemented for compatibility.
4016 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
4018 } else if (Subtarget->isThumb2()) {
4019 // A constant whose bitwise inverse can be used as an immediate
4020 // value in a data-processing instruction. This can be used in GCC
4021 // with a "B" modifier that prints the inverted value, for use with
4022 // BIC and MVN instructions. It is not useful otherwise but is
4023 // implemented for compatibility.
4024 if (ARM_AM::getT2SOImmVal(~CVal) != -1)
4027 // A constant whose bitwise inverse can be used as an immediate
4028 // value in a data-processing instruction. This can be used in GCC
4029 // with a "B" modifier that prints the inverted value, for use with
4030 // BIC and MVN instructions. It is not useful otherwise but is
4031 // implemented for compatibility.
4032 if (ARM_AM::getSOImmVal(~CVal) != -1)
4038 if (Subtarget->isThumb1Only()) {
4039 // This must be a constant between -7 and 7,
4040 // for 3-operand ADD/SUB immediate instructions.
4041 if (CVal >= -7 && CVal < 7)
4043 } else if (Subtarget->isThumb2()) {
4044 // A constant whose negation can be used as an immediate value in a
4045 // data-processing instruction. This can be used in GCC with an "n"
4046 // modifier that prints the negated value, for use with SUB
4047 // instructions. It is not useful otherwise but is implemented for
4049 if (ARM_AM::getT2SOImmVal(-CVal) != -1)
4052 // A constant whose negation can be used as an immediate value in a
4053 // data-processing instruction. This can be used in GCC with an "n"
4054 // modifier that prints the negated value, for use with SUB
4055 // instructions. It is not useful otherwise but is implemented for
4057 if (ARM_AM::getSOImmVal(-CVal) != -1)
4063 if (Subtarget->isThumb()) { // FIXME thumb2
4064 // This must be a multiple of 4 between 0 and 1020, for
4065 // ADD sp + immediate.
4066 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
4069 // A power of two or a constant between 0 and 32. This is used in
4070 // GCC for the shift amount on shifted register operands, but it is
4071 // useful in general for any shift amounts.
4072 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
4078 if (Subtarget->isThumb()) { // FIXME thumb2
4079 // This must be a constant between 0 and 31, for shift amounts.
4080 if (CVal >= 0 && CVal <= 31)
4086 if (Subtarget->isThumb()) { // FIXME thumb2
4087 // This must be a multiple of 4 between -508 and 508, for
4088 // ADD/SUB sp = sp + immediate.
4089 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
4094 Result = DAG.getTargetConstant(CVal, Op.getValueType());
4098 if (Result.getNode()) {
4099 Ops.push_back(Result);
4102 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory,
4107 ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
4108 // The ARM target isn't yet aware of offsets.
4112 int ARM::getVFPf32Imm(const APFloat &FPImm) {
4113 APInt Imm = FPImm.bitcastToAPInt();
4114 uint32_t Sign = Imm.lshr(31).getZExtValue() & 1;
4115 int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127
4116 int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits
4118 // We can handle 4 bits of mantissa.
4119 // mantissa = (16+UInt(e:f:g:h))/16.
4120 if (Mantissa & 0x7ffff)
4123 if ((Mantissa & 0xf) != Mantissa)
4126 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
4127 if (Exp < -3 || Exp > 4)
4129 Exp = ((Exp+3) & 0x7) ^ 4;
4131 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
4134 int ARM::getVFPf64Imm(const APFloat &FPImm) {
4135 APInt Imm = FPImm.bitcastToAPInt();
4136 uint64_t Sign = Imm.lshr(63).getZExtValue() & 1;
4137 int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023
4138 uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL;
4140 // We can handle 4 bits of mantissa.
4141 // mantissa = (16+UInt(e:f:g:h))/16.
4142 if (Mantissa & 0xffffffffffffLL)
4145 if ((Mantissa & 0xf) != Mantissa)
4148 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
4149 if (Exp < -3 || Exp > 4)
4151 Exp = ((Exp+3) & 0x7) ^ 4;
4153 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
4156 /// isFPImmLegal - Returns true if the target can instruction select the
4157 /// specified FP immediate natively. If false, the legalizer will
4158 /// materialize the FP immediate as a load from a constant pool.
4159 bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
4160 if (!Subtarget->hasVFP3())
4163 return ARM::getVFPf32Imm(Imm) != -1;
4165 return ARM::getVFPf64Imm(Imm) != -1;