1 //===-- X86FastISel.cpp - X86 FastISel 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 X86-specific support for the FastISel class. Much
11 // of the target-specific code is generated by tablegen in the file
12 // X86GenFastISel.inc, which is #included here.
14 //===----------------------------------------------------------------------===//
17 #include "X86CallingConv.h"
18 #include "X86InstrBuilder.h"
19 #include "X86InstrInfo.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86RegisterInfo.h"
22 #include "X86Subtarget.h"
23 #include "X86TargetMachine.h"
24 #include "llvm/Analysis/BranchProbabilityInfo.h"
25 #include "llvm/CodeGen/Analysis.h"
26 #include "llvm/CodeGen/FastISel.h"
27 #include "llvm/CodeGen/FunctionLoweringInfo.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/IR/CallSite.h"
32 #include "llvm/IR/CallingConv.h"
33 #include "llvm/IR/DerivedTypes.h"
34 #include "llvm/IR/GetElementPtrTypeIterator.h"
35 #include "llvm/IR/GlobalAlias.h"
36 #include "llvm/IR/GlobalVariable.h"
37 #include "llvm/IR/Instructions.h"
38 #include "llvm/IR/IntrinsicInst.h"
39 #include "llvm/IR/Operator.h"
40 #include "llvm/Support/ErrorHandling.h"
41 #include "llvm/Target/TargetOptions.h"
46 class X86FastISel final : public FastISel {
47 /// Subtarget - Keep a pointer to the X86Subtarget around so that we can
48 /// make the right decision when generating code for different targets.
49 const X86Subtarget *Subtarget;
51 /// X86ScalarSSEf32, X86ScalarSSEf64 - Select between SSE or x87
52 /// floating point ops.
53 /// When SSE is available, use it for f32 operations.
54 /// When SSE2 is available, use it for f64 operations.
59 explicit X86FastISel(FunctionLoweringInfo &funcInfo,
60 const TargetLibraryInfo *libInfo)
61 : FastISel(funcInfo, libInfo) {
62 Subtarget = &TM.getSubtarget<X86Subtarget>();
63 X86ScalarSSEf64 = Subtarget->hasSSE2();
64 X86ScalarSSEf32 = Subtarget->hasSSE1();
67 bool TargetSelectInstruction(const Instruction *I) override;
69 /// \brief The specified machine instr operand is a vreg, and that
70 /// vreg is being provided by the specified load instruction. If possible,
71 /// try to fold the load as an operand to the instruction, returning true if
73 bool tryToFoldLoadIntoMI(MachineInstr *MI, unsigned OpNo,
74 const LoadInst *LI) override;
76 bool FastLowerArguments() override;
77 bool FastLowerCall(CallLoweringInfo &CLI) override;
78 bool FastLowerIntrinsicCall(const IntrinsicInst *II) override;
80 #include "X86GenFastISel.inc"
83 bool X86FastEmitCompare(const Value *LHS, const Value *RHS, EVT VT);
85 bool X86FastEmitLoad(EVT VT, const X86AddressMode &AM, MachineMemOperand *MMO,
88 bool X86FastEmitStore(EVT VT, const Value *Val, const X86AddressMode &AM,
89 MachineMemOperand *MMO = nullptr, bool Aligned = false);
90 bool X86FastEmitStore(EVT VT, unsigned ValReg, bool ValIsKill,
91 const X86AddressMode &AM,
92 MachineMemOperand *MMO = nullptr, bool Aligned = false);
94 bool X86FastEmitExtend(ISD::NodeType Opc, EVT DstVT, unsigned Src, EVT SrcVT,
97 bool X86SelectAddress(const Value *V, X86AddressMode &AM);
98 bool X86SelectCallAddress(const Value *V, X86AddressMode &AM);
100 bool X86SelectLoad(const Instruction *I);
102 bool X86SelectStore(const Instruction *I);
104 bool X86SelectRet(const Instruction *I);
106 bool X86SelectCmp(const Instruction *I);
108 bool X86SelectZExt(const Instruction *I);
110 bool X86SelectBranch(const Instruction *I);
112 bool X86SelectShift(const Instruction *I);
114 bool X86SelectDivRem(const Instruction *I);
116 bool X86FastEmitCMoveSelect(MVT RetVT, const Instruction *I);
118 bool X86FastEmitSSESelect(MVT RetVT, const Instruction *I);
120 bool X86FastEmitPseudoSelect(MVT RetVT, const Instruction *I);
122 bool X86SelectSelect(const Instruction *I);
124 bool X86SelectTrunc(const Instruction *I);
126 bool X86SelectFPExt(const Instruction *I);
127 bool X86SelectFPTrunc(const Instruction *I);
129 const X86InstrInfo *getInstrInfo() const {
130 return getTargetMachine()->getInstrInfo();
132 const X86TargetMachine *getTargetMachine() const {
133 return static_cast<const X86TargetMachine *>(&TM);
136 bool handleConstantAddresses(const Value *V, X86AddressMode &AM);
138 unsigned TargetMaterializeConstant(const Constant *C) override;
140 unsigned TargetMaterializeAlloca(const AllocaInst *C) override;
142 unsigned TargetMaterializeFloatZero(const ConstantFP *CF) override;
144 /// isScalarFPTypeInSSEReg - Return true if the specified scalar FP type is
145 /// computed in an SSE register, not on the X87 floating point stack.
146 bool isScalarFPTypeInSSEReg(EVT VT) const {
147 return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
148 (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
151 bool isTypeLegal(Type *Ty, MVT &VT, bool AllowI1 = false);
153 bool IsMemcpySmall(uint64_t Len);
155 bool TryEmitSmallMemcpy(X86AddressMode DestAM,
156 X86AddressMode SrcAM, uint64_t Len);
158 bool foldX86XALUIntrinsic(X86::CondCode &CC, const Instruction *I,
162 } // end anonymous namespace.
164 static CmpInst::Predicate optimizeCmpPredicate(const CmpInst *CI) {
165 // If both operands are the same, then try to optimize or fold the cmp.
166 CmpInst::Predicate Predicate = CI->getPredicate();
167 if (CI->getOperand(0) != CI->getOperand(1))
171 default: llvm_unreachable("Invalid predicate!");
172 case CmpInst::FCMP_FALSE: Predicate = CmpInst::FCMP_FALSE; break;
173 case CmpInst::FCMP_OEQ: Predicate = CmpInst::FCMP_ORD; break;
174 case CmpInst::FCMP_OGT: Predicate = CmpInst::FCMP_FALSE; break;
175 case CmpInst::FCMP_OGE: Predicate = CmpInst::FCMP_ORD; break;
176 case CmpInst::FCMP_OLT: Predicate = CmpInst::FCMP_FALSE; break;
177 case CmpInst::FCMP_OLE: Predicate = CmpInst::FCMP_ORD; break;
178 case CmpInst::FCMP_ONE: Predicate = CmpInst::FCMP_FALSE; break;
179 case CmpInst::FCMP_ORD: Predicate = CmpInst::FCMP_ORD; break;
180 case CmpInst::FCMP_UNO: Predicate = CmpInst::FCMP_UNO; break;
181 case CmpInst::FCMP_UEQ: Predicate = CmpInst::FCMP_TRUE; break;
182 case CmpInst::FCMP_UGT: Predicate = CmpInst::FCMP_UNO; break;
183 case CmpInst::FCMP_UGE: Predicate = CmpInst::FCMP_TRUE; break;
184 case CmpInst::FCMP_ULT: Predicate = CmpInst::FCMP_UNO; break;
185 case CmpInst::FCMP_ULE: Predicate = CmpInst::FCMP_TRUE; break;
186 case CmpInst::FCMP_UNE: Predicate = CmpInst::FCMP_UNO; break;
187 case CmpInst::FCMP_TRUE: Predicate = CmpInst::FCMP_TRUE; break;
189 case CmpInst::ICMP_EQ: Predicate = CmpInst::FCMP_TRUE; break;
190 case CmpInst::ICMP_NE: Predicate = CmpInst::FCMP_FALSE; break;
191 case CmpInst::ICMP_UGT: Predicate = CmpInst::FCMP_FALSE; break;
192 case CmpInst::ICMP_UGE: Predicate = CmpInst::FCMP_TRUE; break;
193 case CmpInst::ICMP_ULT: Predicate = CmpInst::FCMP_FALSE; break;
194 case CmpInst::ICMP_ULE: Predicate = CmpInst::FCMP_TRUE; break;
195 case CmpInst::ICMP_SGT: Predicate = CmpInst::FCMP_FALSE; break;
196 case CmpInst::ICMP_SGE: Predicate = CmpInst::FCMP_TRUE; break;
197 case CmpInst::ICMP_SLT: Predicate = CmpInst::FCMP_FALSE; break;
198 case CmpInst::ICMP_SLE: Predicate = CmpInst::FCMP_TRUE; break;
204 static std::pair<X86::CondCode, bool>
205 getX86ConditionCode(CmpInst::Predicate Predicate) {
206 X86::CondCode CC = X86::COND_INVALID;
207 bool NeedSwap = false;
210 // Floating-point Predicates
211 case CmpInst::FCMP_UEQ: CC = X86::COND_E; break;
212 case CmpInst::FCMP_OLT: NeedSwap = true; // fall-through
213 case CmpInst::FCMP_OGT: CC = X86::COND_A; break;
214 case CmpInst::FCMP_OLE: NeedSwap = true; // fall-through
215 case CmpInst::FCMP_OGE: CC = X86::COND_AE; break;
216 case CmpInst::FCMP_UGT: NeedSwap = true; // fall-through
217 case CmpInst::FCMP_ULT: CC = X86::COND_B; break;
218 case CmpInst::FCMP_UGE: NeedSwap = true; // fall-through
219 case CmpInst::FCMP_ULE: CC = X86::COND_BE; break;
220 case CmpInst::FCMP_ONE: CC = X86::COND_NE; break;
221 case CmpInst::FCMP_UNO: CC = X86::COND_P; break;
222 case CmpInst::FCMP_ORD: CC = X86::COND_NP; break;
223 case CmpInst::FCMP_OEQ: // fall-through
224 case CmpInst::FCMP_UNE: CC = X86::COND_INVALID; break;
226 // Integer Predicates
227 case CmpInst::ICMP_EQ: CC = X86::COND_E; break;
228 case CmpInst::ICMP_NE: CC = X86::COND_NE; break;
229 case CmpInst::ICMP_UGT: CC = X86::COND_A; break;
230 case CmpInst::ICMP_UGE: CC = X86::COND_AE; break;
231 case CmpInst::ICMP_ULT: CC = X86::COND_B; break;
232 case CmpInst::ICMP_ULE: CC = X86::COND_BE; break;
233 case CmpInst::ICMP_SGT: CC = X86::COND_G; break;
234 case CmpInst::ICMP_SGE: CC = X86::COND_GE; break;
235 case CmpInst::ICMP_SLT: CC = X86::COND_L; break;
236 case CmpInst::ICMP_SLE: CC = X86::COND_LE; break;
239 return std::make_pair(CC, NeedSwap);
242 static std::pair<unsigned, bool>
243 getX86SSEConditionCode(CmpInst::Predicate Predicate) {
245 bool NeedSwap = false;
247 // SSE Condition code mapping:
257 default: llvm_unreachable("Unexpected predicate");
258 case CmpInst::FCMP_OEQ: CC = 0; break;
259 case CmpInst::FCMP_OGT: NeedSwap = true; // fall-through
260 case CmpInst::FCMP_OLT: CC = 1; break;
261 case CmpInst::FCMP_OGE: NeedSwap = true; // fall-through
262 case CmpInst::FCMP_OLE: CC = 2; break;
263 case CmpInst::FCMP_UNO: CC = 3; break;
264 case CmpInst::FCMP_UNE: CC = 4; break;
265 case CmpInst::FCMP_ULE: NeedSwap = true; // fall-through
266 case CmpInst::FCMP_UGE: CC = 5; break;
267 case CmpInst::FCMP_ULT: NeedSwap = true; // fall-through
268 case CmpInst::FCMP_UGT: CC = 6; break;
269 case CmpInst::FCMP_ORD: CC = 7; break;
270 case CmpInst::FCMP_UEQ:
271 case CmpInst::FCMP_ONE: CC = 8; break;
274 return std::make_pair(CC, NeedSwap);
277 /// \brief Check if it is possible to fold the condition from the XALU intrinsic
278 /// into the user. The condition code will only be updated on success.
279 bool X86FastISel::foldX86XALUIntrinsic(X86::CondCode &CC, const Instruction *I,
281 if (!isa<ExtractValueInst>(Cond))
284 const auto *EV = cast<ExtractValueInst>(Cond);
285 if (!isa<IntrinsicInst>(EV->getAggregateOperand()))
288 const auto *II = cast<IntrinsicInst>(EV->getAggregateOperand());
290 const Function *Callee = II->getCalledFunction();
292 cast<StructType>(Callee->getReturnType())->getTypeAtIndex(0U);
293 if (!isTypeLegal(RetTy, RetVT))
296 if (RetVT != MVT::i32 && RetVT != MVT::i64)
300 switch (II->getIntrinsicID()) {
301 default: return false;
302 case Intrinsic::sadd_with_overflow:
303 case Intrinsic::ssub_with_overflow:
304 case Intrinsic::smul_with_overflow:
305 case Intrinsic::umul_with_overflow: TmpCC = X86::COND_O; break;
306 case Intrinsic::uadd_with_overflow:
307 case Intrinsic::usub_with_overflow: TmpCC = X86::COND_B; break;
310 // Check if both instructions are in the same basic block.
311 if (II->getParent() != I->getParent())
314 // Make sure nothing is in the way
315 BasicBlock::const_iterator Start = I;
316 BasicBlock::const_iterator End = II;
317 for (auto Itr = std::prev(Start); Itr != End; --Itr) {
318 // We only expect extractvalue instructions between the intrinsic and the
319 // instruction to be selected.
320 if (!isa<ExtractValueInst>(Itr))
323 // Check that the extractvalue operand comes from the intrinsic.
324 const auto *EVI = cast<ExtractValueInst>(Itr);
325 if (EVI->getAggregateOperand() != II)
333 bool X86FastISel::isTypeLegal(Type *Ty, MVT &VT, bool AllowI1) {
334 EVT evt = TLI.getValueType(Ty, /*HandleUnknown=*/true);
335 if (evt == MVT::Other || !evt.isSimple())
336 // Unhandled type. Halt "fast" selection and bail.
339 VT = evt.getSimpleVT();
340 // For now, require SSE/SSE2 for performing floating-point operations,
341 // since x87 requires additional work.
342 if (VT == MVT::f64 && !X86ScalarSSEf64)
344 if (VT == MVT::f32 && !X86ScalarSSEf32)
346 // Similarly, no f80 support yet.
349 // We only handle legal types. For example, on x86-32 the instruction
350 // selector contains all of the 64-bit instructions from x86-64,
351 // under the assumption that i64 won't be used if the target doesn't
353 return (AllowI1 && VT == MVT::i1) || TLI.isTypeLegal(VT);
356 #include "X86GenCallingConv.inc"
358 /// X86FastEmitLoad - Emit a machine instruction to load a value of type VT.
359 /// The address is either pre-computed, i.e. Ptr, or a GlobalAddress, i.e. GV.
360 /// Return true and the result register by reference if it is possible.
361 bool X86FastISel::X86FastEmitLoad(EVT VT, const X86AddressMode &AM,
362 MachineMemOperand *MMO, unsigned &ResultReg) {
363 // Get opcode and regclass of the output for the given load instruction.
365 const TargetRegisterClass *RC = nullptr;
366 switch (VT.getSimpleVT().SimpleTy) {
367 default: return false;
371 RC = &X86::GR8RegClass;
375 RC = &X86::GR16RegClass;
379 RC = &X86::GR32RegClass;
382 // Must be in x86-64 mode.
384 RC = &X86::GR64RegClass;
387 if (X86ScalarSSEf32) {
388 Opc = Subtarget->hasAVX() ? X86::VMOVSSrm : X86::MOVSSrm;
389 RC = &X86::FR32RegClass;
392 RC = &X86::RFP32RegClass;
396 if (X86ScalarSSEf64) {
397 Opc = Subtarget->hasAVX() ? X86::VMOVSDrm : X86::MOVSDrm;
398 RC = &X86::FR64RegClass;
401 RC = &X86::RFP64RegClass;
405 // No f80 support yet.
409 ResultReg = createResultReg(RC);
410 MachineInstrBuilder MIB =
411 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg);
412 addFullAddress(MIB, AM);
414 MIB->addMemOperand(*FuncInfo.MF, MMO);
418 /// X86FastEmitStore - Emit a machine instruction to store a value Val of
419 /// type VT. The address is either pre-computed, consisted of a base ptr, Ptr
420 /// and a displacement offset, or a GlobalAddress,
421 /// i.e. V. Return true if it is possible.
422 bool X86FastISel::X86FastEmitStore(EVT VT, unsigned ValReg, bool ValIsKill,
423 const X86AddressMode &AM,
424 MachineMemOperand *MMO, bool Aligned) {
425 // Get opcode and regclass of the output for the given store instruction.
427 switch (VT.getSimpleVT().SimpleTy) {
428 case MVT::f80: // No f80 support yet.
429 default: return false;
431 // Mask out all but lowest bit.
432 unsigned AndResult = createResultReg(&X86::GR8RegClass);
433 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
434 TII.get(X86::AND8ri), AndResult)
435 .addReg(ValReg, getKillRegState(ValIsKill)).addImm(1);
438 // FALLTHROUGH, handling i1 as i8.
439 case MVT::i8: Opc = X86::MOV8mr; break;
440 case MVT::i16: Opc = X86::MOV16mr; break;
441 case MVT::i32: Opc = X86::MOV32mr; break;
442 case MVT::i64: Opc = X86::MOV64mr; break; // Must be in x86-64 mode.
444 Opc = X86ScalarSSEf32 ?
445 (Subtarget->hasAVX() ? X86::VMOVSSmr : X86::MOVSSmr) : X86::ST_Fp32m;
448 Opc = X86ScalarSSEf64 ?
449 (Subtarget->hasAVX() ? X86::VMOVSDmr : X86::MOVSDmr) : X86::ST_Fp64m;
453 Opc = Subtarget->hasAVX() ? X86::VMOVAPSmr : X86::MOVAPSmr;
455 Opc = Subtarget->hasAVX() ? X86::VMOVUPSmr : X86::MOVUPSmr;
459 Opc = Subtarget->hasAVX() ? X86::VMOVAPDmr : X86::MOVAPDmr;
461 Opc = Subtarget->hasAVX() ? X86::VMOVUPDmr : X86::MOVUPDmr;
468 Opc = Subtarget->hasAVX() ? X86::VMOVDQAmr : X86::MOVDQAmr;
470 Opc = Subtarget->hasAVX() ? X86::VMOVDQUmr : X86::MOVDQUmr;
474 MachineInstrBuilder MIB =
475 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc));
476 addFullAddress(MIB, AM).addReg(ValReg, getKillRegState(ValIsKill));
478 MIB->addMemOperand(*FuncInfo.MF, MMO);
483 bool X86FastISel::X86FastEmitStore(EVT VT, const Value *Val,
484 const X86AddressMode &AM,
485 MachineMemOperand *MMO, bool Aligned) {
486 // Handle 'null' like i32/i64 0.
487 if (isa<ConstantPointerNull>(Val))
488 Val = Constant::getNullValue(DL.getIntPtrType(Val->getContext()));
490 // If this is a store of a simple constant, fold the constant into the store.
491 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Val)) {
494 switch (VT.getSimpleVT().SimpleTy) {
496 case MVT::i1: Signed = false; // FALLTHROUGH to handle as i8.
497 case MVT::i8: Opc = X86::MOV8mi; break;
498 case MVT::i16: Opc = X86::MOV16mi; break;
499 case MVT::i32: Opc = X86::MOV32mi; break;
501 // Must be a 32-bit sign extended value.
502 if (isInt<32>(CI->getSExtValue()))
503 Opc = X86::MOV64mi32;
508 MachineInstrBuilder MIB =
509 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc));
510 addFullAddress(MIB, AM).addImm(Signed ? (uint64_t) CI->getSExtValue()
511 : CI->getZExtValue());
513 MIB->addMemOperand(*FuncInfo.MF, MMO);
518 unsigned ValReg = getRegForValue(Val);
522 bool ValKill = hasTrivialKill(Val);
523 return X86FastEmitStore(VT, ValReg, ValKill, AM, MMO, Aligned);
526 /// X86FastEmitExtend - Emit a machine instruction to extend a value Src of
527 /// type SrcVT to type DstVT using the specified extension opcode Opc (e.g.
528 /// ISD::SIGN_EXTEND).
529 bool X86FastISel::X86FastEmitExtend(ISD::NodeType Opc, EVT DstVT,
530 unsigned Src, EVT SrcVT,
531 unsigned &ResultReg) {
532 unsigned RR = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(), Opc,
533 Src, /*TODO: Kill=*/false);
541 bool X86FastISel::handleConstantAddresses(const Value *V, X86AddressMode &AM) {
542 // Handle constant address.
543 if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
544 // Can't handle alternate code models yet.
545 if (TM.getCodeModel() != CodeModel::Small)
548 // Can't handle TLS yet.
549 if (GV->isThreadLocal())
552 // RIP-relative addresses can't have additional register operands, so if
553 // we've already folded stuff into the addressing mode, just force the
554 // global value into its own register, which we can use as the basereg.
555 if (!Subtarget->isPICStyleRIPRel() ||
556 (AM.Base.Reg == 0 && AM.IndexReg == 0)) {
557 // Okay, we've committed to selecting this global. Set up the address.
560 // Allow the subtarget to classify the global.
561 unsigned char GVFlags = Subtarget->ClassifyGlobalReference(GV, TM);
563 // If this reference is relative to the pic base, set it now.
564 if (isGlobalRelativeToPICBase(GVFlags)) {
565 // FIXME: How do we know Base.Reg is free??
566 AM.Base.Reg = getInstrInfo()->getGlobalBaseReg(FuncInfo.MF);
569 // Unless the ABI requires an extra load, return a direct reference to
571 if (!isGlobalStubReference(GVFlags)) {
572 if (Subtarget->isPICStyleRIPRel()) {
573 // Use rip-relative addressing if we can. Above we verified that the
574 // base and index registers are unused.
575 assert(AM.Base.Reg == 0 && AM.IndexReg == 0);
576 AM.Base.Reg = X86::RIP;
578 AM.GVOpFlags = GVFlags;
582 // Ok, we need to do a load from a stub. If we've already loaded from
583 // this stub, reuse the loaded pointer, otherwise emit the load now.
584 DenseMap<const Value*, unsigned>::iterator I = LocalValueMap.find(V);
586 if (I != LocalValueMap.end() && I->second != 0) {
589 // Issue load from stub.
591 const TargetRegisterClass *RC = nullptr;
592 X86AddressMode StubAM;
593 StubAM.Base.Reg = AM.Base.Reg;
595 StubAM.GVOpFlags = GVFlags;
597 // Prepare for inserting code in the local-value area.
598 SavePoint SaveInsertPt = enterLocalValueArea();
600 if (TLI.getPointerTy() == MVT::i64) {
602 RC = &X86::GR64RegClass;
604 if (Subtarget->isPICStyleRIPRel())
605 StubAM.Base.Reg = X86::RIP;
608 RC = &X86::GR32RegClass;
611 LoadReg = createResultReg(RC);
612 MachineInstrBuilder LoadMI =
613 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), LoadReg);
614 addFullAddress(LoadMI, StubAM);
616 // Ok, back to normal mode.
617 leaveLocalValueArea(SaveInsertPt);
619 // Prevent loading GV stub multiple times in same MBB.
620 LocalValueMap[V] = LoadReg;
623 // Now construct the final address. Note that the Disp, Scale,
624 // and Index values may already be set here.
625 AM.Base.Reg = LoadReg;
631 // If all else fails, try to materialize the value in a register.
632 if (!AM.GV || !Subtarget->isPICStyleRIPRel()) {
633 if (AM.Base.Reg == 0) {
634 AM.Base.Reg = getRegForValue(V);
635 return AM.Base.Reg != 0;
637 if (AM.IndexReg == 0) {
638 assert(AM.Scale == 1 && "Scale with no index!");
639 AM.IndexReg = getRegForValue(V);
640 return AM.IndexReg != 0;
647 /// X86SelectAddress - Attempt to fill in an address from the given value.
649 bool X86FastISel::X86SelectAddress(const Value *V, X86AddressMode &AM) {
650 SmallVector<const Value *, 32> GEPs;
652 const User *U = nullptr;
653 unsigned Opcode = Instruction::UserOp1;
654 if (const Instruction *I = dyn_cast<Instruction>(V)) {
655 // Don't walk into other basic blocks; it's possible we haven't
656 // visited them yet, so the instructions may not yet be assigned
657 // virtual registers.
658 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(V)) ||
659 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
660 Opcode = I->getOpcode();
663 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(V)) {
664 Opcode = C->getOpcode();
668 if (PointerType *Ty = dyn_cast<PointerType>(V->getType()))
669 if (Ty->getAddressSpace() > 255)
670 // Fast instruction selection doesn't support the special
676 case Instruction::BitCast:
677 // Look past bitcasts.
678 return X86SelectAddress(U->getOperand(0), AM);
680 case Instruction::IntToPtr:
681 // Look past no-op inttoptrs.
682 if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
683 return X86SelectAddress(U->getOperand(0), AM);
686 case Instruction::PtrToInt:
687 // Look past no-op ptrtoints.
688 if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
689 return X86SelectAddress(U->getOperand(0), AM);
692 case Instruction::Alloca: {
693 // Do static allocas.
694 const AllocaInst *A = cast<AllocaInst>(V);
695 DenseMap<const AllocaInst*, int>::iterator SI =
696 FuncInfo.StaticAllocaMap.find(A);
697 if (SI != FuncInfo.StaticAllocaMap.end()) {
698 AM.BaseType = X86AddressMode::FrameIndexBase;
699 AM.Base.FrameIndex = SI->second;
705 case Instruction::Add: {
706 // Adds of constants are common and easy enough.
707 if (const ConstantInt *CI = dyn_cast<ConstantInt>(U->getOperand(1))) {
708 uint64_t Disp = (int32_t)AM.Disp + (uint64_t)CI->getSExtValue();
709 // They have to fit in the 32-bit signed displacement field though.
710 if (isInt<32>(Disp)) {
711 AM.Disp = (uint32_t)Disp;
712 return X86SelectAddress(U->getOperand(0), AM);
718 case Instruction::GetElementPtr: {
719 X86AddressMode SavedAM = AM;
721 // Pattern-match simple GEPs.
722 uint64_t Disp = (int32_t)AM.Disp;
723 unsigned IndexReg = AM.IndexReg;
724 unsigned Scale = AM.Scale;
725 gep_type_iterator GTI = gep_type_begin(U);
726 // Iterate through the indices, folding what we can. Constants can be
727 // folded, and one dynamic index can be handled, if the scale is supported.
728 for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end();
729 i != e; ++i, ++GTI) {
730 const Value *Op = *i;
731 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
732 const StructLayout *SL = DL.getStructLayout(STy);
733 Disp += SL->getElementOffset(cast<ConstantInt>(Op)->getZExtValue());
737 // A array/variable index is always of the form i*S where S is the
738 // constant scale size. See if we can push the scale into immediates.
739 uint64_t S = DL.getTypeAllocSize(GTI.getIndexedType());
741 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
742 // Constant-offset addressing.
743 Disp += CI->getSExtValue() * S;
746 if (canFoldAddIntoGEP(U, Op)) {
747 // A compatible add with a constant operand. Fold the constant.
749 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
750 Disp += CI->getSExtValue() * S;
751 // Iterate on the other operand.
752 Op = cast<AddOperator>(Op)->getOperand(0);
756 (!AM.GV || !Subtarget->isPICStyleRIPRel()) &&
757 (S == 1 || S == 2 || S == 4 || S == 8)) {
758 // Scaled-index addressing.
760 IndexReg = getRegForGEPIndex(Op).first;
766 goto unsupported_gep;
770 // Check for displacement overflow.
771 if (!isInt<32>(Disp))
774 AM.IndexReg = IndexReg;
776 AM.Disp = (uint32_t)Disp;
779 if (const GetElementPtrInst *GEP =
780 dyn_cast<GetElementPtrInst>(U->getOperand(0))) {
781 // Ok, the GEP indices were covered by constant-offset and scaled-index
782 // addressing. Update the address state and move on to examining the base.
785 } else if (X86SelectAddress(U->getOperand(0), AM)) {
789 // If we couldn't merge the gep value into this addr mode, revert back to
790 // our address and just match the value instead of completely failing.
793 for (SmallVectorImpl<const Value *>::reverse_iterator
794 I = GEPs.rbegin(), E = GEPs.rend(); I != E; ++I)
795 if (handleConstantAddresses(*I, AM))
800 // Ok, the GEP indices weren't all covered.
805 return handleConstantAddresses(V, AM);
808 /// X86SelectCallAddress - Attempt to fill in an address from the given value.
810 bool X86FastISel::X86SelectCallAddress(const Value *V, X86AddressMode &AM) {
811 const User *U = nullptr;
812 unsigned Opcode = Instruction::UserOp1;
813 const Instruction *I = dyn_cast<Instruction>(V);
814 // Record if the value is defined in the same basic block.
816 // This information is crucial to know whether or not folding an
818 // Indeed, FastISel generates or reuses a virtual register for all
819 // operands of all instructions it selects. Obviously, the definition and
820 // its uses must use the same virtual register otherwise the produced
821 // code is incorrect.
822 // Before instruction selection, FunctionLoweringInfo::set sets the virtual
823 // registers for values that are alive across basic blocks. This ensures
824 // that the values are consistently set between across basic block, even
825 // if different instruction selection mechanisms are used (e.g., a mix of
826 // SDISel and FastISel).
827 // For values local to a basic block, the instruction selection process
828 // generates these virtual registers with whatever method is appropriate
829 // for its needs. In particular, FastISel and SDISel do not share the way
830 // local virtual registers are set.
831 // Therefore, this is impossible (or at least unsafe) to share values
832 // between basic blocks unless they use the same instruction selection
833 // method, which is not guarantee for X86.
834 // Moreover, things like hasOneUse could not be used accurately, if we
835 // allow to reference values across basic blocks whereas they are not
836 // alive across basic blocks initially.
839 Opcode = I->getOpcode();
841 InMBB = I->getParent() == FuncInfo.MBB->getBasicBlock();
842 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(V)) {
843 Opcode = C->getOpcode();
849 case Instruction::BitCast:
850 // Look past bitcasts if its operand is in the same BB.
852 return X86SelectCallAddress(U->getOperand(0), AM);
855 case Instruction::IntToPtr:
856 // Look past no-op inttoptrs if its operand is in the same BB.
858 TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
859 return X86SelectCallAddress(U->getOperand(0), AM);
862 case Instruction::PtrToInt:
863 // Look past no-op ptrtoints if its operand is in the same BB.
865 TLI.getValueType(U->getType()) == TLI.getPointerTy())
866 return X86SelectCallAddress(U->getOperand(0), AM);
870 // Handle constant address.
871 if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
872 // Can't handle alternate code models yet.
873 if (TM.getCodeModel() != CodeModel::Small)
876 // RIP-relative addresses can't have additional register operands.
877 if (Subtarget->isPICStyleRIPRel() &&
878 (AM.Base.Reg != 0 || AM.IndexReg != 0))
881 // Can't handle DLL Import.
882 if (GV->hasDLLImportStorageClass())
886 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
887 if (GVar->isThreadLocal())
890 // Okay, we've committed to selecting this global. Set up the basic address.
893 // No ABI requires an extra load for anything other than DLLImport, which
894 // we rejected above. Return a direct reference to the global.
895 if (Subtarget->isPICStyleRIPRel()) {
896 // Use rip-relative addressing if we can. Above we verified that the
897 // base and index registers are unused.
898 assert(AM.Base.Reg == 0 && AM.IndexReg == 0);
899 AM.Base.Reg = X86::RIP;
900 } else if (Subtarget->isPICStyleStubPIC()) {
901 AM.GVOpFlags = X86II::MO_PIC_BASE_OFFSET;
902 } else if (Subtarget->isPICStyleGOT()) {
903 AM.GVOpFlags = X86II::MO_GOTOFF;
909 // If all else fails, try to materialize the value in a register.
910 if (!AM.GV || !Subtarget->isPICStyleRIPRel()) {
911 if (AM.Base.Reg == 0) {
912 AM.Base.Reg = getRegForValue(V);
913 return AM.Base.Reg != 0;
915 if (AM.IndexReg == 0) {
916 assert(AM.Scale == 1 && "Scale with no index!");
917 AM.IndexReg = getRegForValue(V);
918 return AM.IndexReg != 0;
926 /// X86SelectStore - Select and emit code to implement store instructions.
927 bool X86FastISel::X86SelectStore(const Instruction *I) {
928 // Atomic stores need special handling.
929 const StoreInst *S = cast<StoreInst>(I);
934 const Value *Val = S->getValueOperand();
935 const Value *Ptr = S->getPointerOperand();
938 if (!isTypeLegal(Val->getType(), VT, /*AllowI1=*/true))
941 unsigned Alignment = S->getAlignment();
942 unsigned ABIAlignment = DL.getABITypeAlignment(Val->getType());
943 if (Alignment == 0) // Ensure that codegen never sees alignment 0
944 Alignment = ABIAlignment;
945 bool Aligned = Alignment >= ABIAlignment;
948 if (!X86SelectAddress(Ptr, AM))
951 return X86FastEmitStore(VT, Val, AM, createMachineMemOperandFor(I), Aligned);
954 /// X86SelectRet - Select and emit code to implement ret instructions.
955 bool X86FastISel::X86SelectRet(const Instruction *I) {
956 const ReturnInst *Ret = cast<ReturnInst>(I);
957 const Function &F = *I->getParent()->getParent();
958 const X86MachineFunctionInfo *X86MFInfo =
959 FuncInfo.MF->getInfo<X86MachineFunctionInfo>();
961 if (!FuncInfo.CanLowerReturn)
964 CallingConv::ID CC = F.getCallingConv();
965 if (CC != CallingConv::C &&
966 CC != CallingConv::Fast &&
967 CC != CallingConv::X86_FastCall &&
968 CC != CallingConv::X86_64_SysV)
971 if (Subtarget->isCallingConvWin64(CC))
974 // Don't handle popping bytes on return for now.
975 if (X86MFInfo->getBytesToPopOnReturn() != 0)
978 // fastcc with -tailcallopt is intended to provide a guaranteed
979 // tail call optimization. Fastisel doesn't know how to do that.
980 if (CC == CallingConv::Fast && TM.Options.GuaranteedTailCallOpt)
983 // Let SDISel handle vararg functions.
987 // Build a list of return value registers.
988 SmallVector<unsigned, 4> RetRegs;
990 if (Ret->getNumOperands() > 0) {
991 SmallVector<ISD::OutputArg, 4> Outs;
992 GetReturnInfo(F.getReturnType(), F.getAttributes(), Outs, TLI);
994 // Analyze operands of the call, assigning locations to each operand.
995 SmallVector<CCValAssign, 16> ValLocs;
996 CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, TM, ValLocs,
998 CCInfo.AnalyzeReturn(Outs, RetCC_X86);
1000 const Value *RV = Ret->getOperand(0);
1001 unsigned Reg = getRegForValue(RV);
1005 // Only handle a single return value for now.
1006 if (ValLocs.size() != 1)
1009 CCValAssign &VA = ValLocs[0];
1011 // Don't bother handling odd stuff for now.
1012 if (VA.getLocInfo() != CCValAssign::Full)
1014 // Only handle register returns for now.
1018 // The calling-convention tables for x87 returns don't tell
1020 if (VA.getLocReg() == X86::ST0 || VA.getLocReg() == X86::ST1)
1023 unsigned SrcReg = Reg + VA.getValNo();
1024 EVT SrcVT = TLI.getValueType(RV->getType());
1025 EVT DstVT = VA.getValVT();
1026 // Special handling for extended integers.
1027 if (SrcVT != DstVT) {
1028 if (SrcVT != MVT::i1 && SrcVT != MVT::i8 && SrcVT != MVT::i16)
1031 if (!Outs[0].Flags.isZExt() && !Outs[0].Flags.isSExt())
1034 assert(DstVT == MVT::i32 && "X86 should always ext to i32");
1036 if (SrcVT == MVT::i1) {
1037 if (Outs[0].Flags.isSExt())
1039 SrcReg = FastEmitZExtFromI1(MVT::i8, SrcReg, /*TODO: Kill=*/false);
1042 unsigned Op = Outs[0].Flags.isZExt() ? ISD::ZERO_EXTEND :
1044 SrcReg = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(), Op,
1045 SrcReg, /*TODO: Kill=*/false);
1049 unsigned DstReg = VA.getLocReg();
1050 const TargetRegisterClass* SrcRC = MRI.getRegClass(SrcReg);
1051 // Avoid a cross-class copy. This is very unlikely.
1052 if (!SrcRC->contains(DstReg))
1054 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
1055 DstReg).addReg(SrcReg);
1057 // Add register to return instruction.
1058 RetRegs.push_back(VA.getLocReg());
1061 // The x86-64 ABI for returning structs by value requires that we copy
1062 // the sret argument into %rax for the return. We saved the argument into
1063 // a virtual register in the entry block, so now we copy the value out
1064 // and into %rax. We also do the same with %eax for Win32.
1065 if (F.hasStructRetAttr() &&
1066 (Subtarget->is64Bit() || Subtarget->isTargetKnownWindowsMSVC())) {
1067 unsigned Reg = X86MFInfo->getSRetReturnReg();
1069 "SRetReturnReg should have been set in LowerFormalArguments()!");
1070 unsigned RetReg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
1071 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
1072 RetReg).addReg(Reg);
1073 RetRegs.push_back(RetReg);
1076 // Now emit the RET.
1077 MachineInstrBuilder MIB =
1078 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Subtarget->is64Bit() ? X86::RETQ : X86::RETL));
1079 for (unsigned i = 0, e = RetRegs.size(); i != e; ++i)
1080 MIB.addReg(RetRegs[i], RegState::Implicit);
1084 /// X86SelectLoad - Select and emit code to implement load instructions.
1086 bool X86FastISel::X86SelectLoad(const Instruction *I) {
1087 const LoadInst *LI = cast<LoadInst>(I);
1089 // Atomic loads need special handling.
1094 if (!isTypeLegal(LI->getType(), VT, /*AllowI1=*/true))
1097 const Value *Ptr = LI->getPointerOperand();
1100 if (!X86SelectAddress(Ptr, AM))
1103 unsigned ResultReg = 0;
1104 if (!X86FastEmitLoad(VT, AM, createMachineMemOperandFor(LI), ResultReg))
1107 UpdateValueMap(I, ResultReg);
1111 static unsigned X86ChooseCmpOpcode(EVT VT, const X86Subtarget *Subtarget) {
1112 bool HasAVX = Subtarget->hasAVX();
1113 bool X86ScalarSSEf32 = Subtarget->hasSSE1();
1114 bool X86ScalarSSEf64 = Subtarget->hasSSE2();
1116 switch (VT.getSimpleVT().SimpleTy) {
1118 case MVT::i8: return X86::CMP8rr;
1119 case MVT::i16: return X86::CMP16rr;
1120 case MVT::i32: return X86::CMP32rr;
1121 case MVT::i64: return X86::CMP64rr;
1123 return X86ScalarSSEf32 ? (HasAVX ? X86::VUCOMISSrr : X86::UCOMISSrr) : 0;
1125 return X86ScalarSSEf64 ? (HasAVX ? X86::VUCOMISDrr : X86::UCOMISDrr) : 0;
1129 /// X86ChooseCmpImmediateOpcode - If we have a comparison with RHS as the RHS
1130 /// of the comparison, return an opcode that works for the compare (e.g.
1131 /// CMP32ri) otherwise return 0.
1132 static unsigned X86ChooseCmpImmediateOpcode(EVT VT, const ConstantInt *RHSC) {
1133 switch (VT.getSimpleVT().SimpleTy) {
1134 // Otherwise, we can't fold the immediate into this comparison.
1136 case MVT::i8: return X86::CMP8ri;
1137 case MVT::i16: return X86::CMP16ri;
1138 case MVT::i32: return X86::CMP32ri;
1140 // 64-bit comparisons are only valid if the immediate fits in a 32-bit sext
1142 if ((int)RHSC->getSExtValue() == RHSC->getSExtValue())
1143 return X86::CMP64ri32;
1148 bool X86FastISel::X86FastEmitCompare(const Value *Op0, const Value *Op1,
1150 unsigned Op0Reg = getRegForValue(Op0);
1151 if (Op0Reg == 0) return false;
1153 // Handle 'null' like i32/i64 0.
1154 if (isa<ConstantPointerNull>(Op1))
1155 Op1 = Constant::getNullValue(DL.getIntPtrType(Op0->getContext()));
1157 // We have two options: compare with register or immediate. If the RHS of
1158 // the compare is an immediate that we can fold into this compare, use
1159 // CMPri, otherwise use CMPrr.
1160 if (const ConstantInt *Op1C = dyn_cast<ConstantInt>(Op1)) {
1161 if (unsigned CompareImmOpc = X86ChooseCmpImmediateOpcode(VT, Op1C)) {
1162 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CompareImmOpc))
1164 .addImm(Op1C->getSExtValue());
1169 unsigned CompareOpc = X86ChooseCmpOpcode(VT, Subtarget);
1170 if (CompareOpc == 0) return false;
1172 unsigned Op1Reg = getRegForValue(Op1);
1173 if (Op1Reg == 0) return false;
1174 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CompareOpc))
1181 bool X86FastISel::X86SelectCmp(const Instruction *I) {
1182 const CmpInst *CI = cast<CmpInst>(I);
1185 if (!isTypeLegal(I->getOperand(0)->getType(), VT))
1188 // Try to optimize or fold the cmp.
1189 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
1190 unsigned ResultReg = 0;
1191 switch (Predicate) {
1193 case CmpInst::FCMP_FALSE: {
1194 ResultReg = createResultReg(&X86::GR32RegClass);
1195 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::MOV32r0),
1197 ResultReg = FastEmitInst_extractsubreg(MVT::i8, ResultReg, /*Kill=*/true,
1203 case CmpInst::FCMP_TRUE: {
1204 ResultReg = createResultReg(&X86::GR8RegClass);
1205 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::MOV8ri),
1206 ResultReg).addImm(1);
1212 UpdateValueMap(I, ResultReg);
1216 const Value *LHS = CI->getOperand(0);
1217 const Value *RHS = CI->getOperand(1);
1219 // The optimizer might have replaced fcmp oeq %x, %x with fcmp ord %x, 0.0.
1220 // We don't have to materialize a zero constant for this case and can just use
1221 // %x again on the RHS.
1222 if (Predicate == CmpInst::FCMP_ORD || Predicate == CmpInst::FCMP_UNO) {
1223 const auto *RHSC = dyn_cast<ConstantFP>(RHS);
1224 if (RHSC && RHSC->isNullValue())
1228 // FCMP_OEQ and FCMP_UNE cannot be checked with a single instruction.
1229 static unsigned SETFOpcTable[2][3] = {
1230 { X86::SETEr, X86::SETNPr, X86::AND8rr },
1231 { X86::SETNEr, X86::SETPr, X86::OR8rr }
1233 unsigned *SETFOpc = nullptr;
1234 switch (Predicate) {
1236 case CmpInst::FCMP_OEQ: SETFOpc = &SETFOpcTable[0][0]; break;
1237 case CmpInst::FCMP_UNE: SETFOpc = &SETFOpcTable[1][0]; break;
1240 ResultReg = createResultReg(&X86::GR8RegClass);
1242 if (!X86FastEmitCompare(LHS, RHS, VT))
1245 unsigned FlagReg1 = createResultReg(&X86::GR8RegClass);
1246 unsigned FlagReg2 = createResultReg(&X86::GR8RegClass);
1247 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(SETFOpc[0]),
1249 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(SETFOpc[1]),
1251 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(SETFOpc[2]),
1252 ResultReg).addReg(FlagReg1).addReg(FlagReg2);
1253 UpdateValueMap(I, ResultReg);
1259 std::tie(CC, SwapArgs) = getX86ConditionCode(Predicate);
1260 assert(CC <= X86::LAST_VALID_COND && "Unexpected condition code.");
1261 unsigned Opc = X86::getSETFromCond(CC);
1264 std::swap(LHS, RHS);
1266 // Emit a compare of LHS/RHS.
1267 if (!X86FastEmitCompare(LHS, RHS, VT))
1270 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg);
1271 UpdateValueMap(I, ResultReg);
1275 bool X86FastISel::X86SelectZExt(const Instruction *I) {
1276 EVT DstVT = TLI.getValueType(I->getType());
1277 if (!TLI.isTypeLegal(DstVT))
1280 unsigned ResultReg = getRegForValue(I->getOperand(0));
1284 // Handle zero-extension from i1 to i8, which is common.
1285 MVT SrcVT = TLI.getSimpleValueType(I->getOperand(0)->getType());
1286 if (SrcVT.SimpleTy == MVT::i1) {
1287 // Set the high bits to zero.
1288 ResultReg = FastEmitZExtFromI1(MVT::i8, ResultReg, /*TODO: Kill=*/false);
1295 if (DstVT == MVT::i64) {
1296 // Handle extension to 64-bits via sub-register shenanigans.
1299 switch (SrcVT.SimpleTy) {
1300 case MVT::i8: MovInst = X86::MOVZX32rr8; break;
1301 case MVT::i16: MovInst = X86::MOVZX32rr16; break;
1302 case MVT::i32: MovInst = X86::MOV32rr; break;
1303 default: llvm_unreachable("Unexpected zext to i64 source type");
1306 unsigned Result32 = createResultReg(&X86::GR32RegClass);
1307 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(MovInst), Result32)
1310 ResultReg = createResultReg(&X86::GR64RegClass);
1311 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::SUBREG_TO_REG),
1313 .addImm(0).addReg(Result32).addImm(X86::sub_32bit);
1314 } else if (DstVT != MVT::i8) {
1315 ResultReg = FastEmit_r(MVT::i8, DstVT.getSimpleVT(), ISD::ZERO_EXTEND,
1316 ResultReg, /*Kill=*/true);
1321 UpdateValueMap(I, ResultReg);
1326 bool X86FastISel::X86SelectBranch(const Instruction *I) {
1327 // Unconditional branches are selected by tablegen-generated code.
1328 // Handle a conditional branch.
1329 const BranchInst *BI = cast<BranchInst>(I);
1330 MachineBasicBlock *TrueMBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
1331 MachineBasicBlock *FalseMBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
1333 // Fold the common case of a conditional branch with a comparison
1334 // in the same block (values defined on other blocks may not have
1335 // initialized registers).
1337 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
1338 if (CI->hasOneUse() && CI->getParent() == I->getParent()) {
1339 EVT VT = TLI.getValueType(CI->getOperand(0)->getType());
1341 // Try to optimize or fold the cmp.
1342 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
1343 switch (Predicate) {
1345 case CmpInst::FCMP_FALSE: FastEmitBranch(FalseMBB, DbgLoc); return true;
1346 case CmpInst::FCMP_TRUE: FastEmitBranch(TrueMBB, DbgLoc); return true;
1349 const Value *CmpLHS = CI->getOperand(0);
1350 const Value *CmpRHS = CI->getOperand(1);
1352 // The optimizer might have replaced fcmp oeq %x, %x with fcmp ord %x,
1354 // We don't have to materialize a zero constant for this case and can just
1355 // use %x again on the RHS.
1356 if (Predicate == CmpInst::FCMP_ORD || Predicate == CmpInst::FCMP_UNO) {
1357 const auto *CmpRHSC = dyn_cast<ConstantFP>(CmpRHS);
1358 if (CmpRHSC && CmpRHSC->isNullValue())
1362 // Try to take advantage of fallthrough opportunities.
1363 if (FuncInfo.MBB->isLayoutSuccessor(TrueMBB)) {
1364 std::swap(TrueMBB, FalseMBB);
1365 Predicate = CmpInst::getInversePredicate(Predicate);
1368 // FCMP_OEQ and FCMP_UNE cannot be expressed with a single flag/condition
1369 // code check. Instead two branch instructions are required to check all
1370 // the flags. First we change the predicate to a supported condition code,
1371 // which will be the first branch. Later one we will emit the second
1373 bool NeedExtraBranch = false;
1374 switch (Predicate) {
1376 case CmpInst::FCMP_OEQ:
1377 std::swap(TrueMBB, FalseMBB); // fall-through
1378 case CmpInst::FCMP_UNE:
1379 NeedExtraBranch = true;
1380 Predicate = CmpInst::FCMP_ONE;
1386 std::tie(CC, SwapArgs) = getX86ConditionCode(Predicate);
1387 assert(CC <= X86::LAST_VALID_COND && "Unexpected condition code.");
1389 BranchOpc = X86::GetCondBranchFromCond(CC);
1391 std::swap(CmpLHS, CmpRHS);
1393 // Emit a compare of the LHS and RHS, setting the flags.
1394 if (!X86FastEmitCompare(CmpLHS, CmpRHS, VT))
1397 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(BranchOpc))
1400 // X86 requires a second branch to handle UNE (and OEQ, which is mapped
1402 if (NeedExtraBranch) {
1403 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::JP_4))
1407 // Obtain the branch weight and add the TrueBB to the successor list.
1408 uint32_t BranchWeight = 0;
1410 BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
1411 TrueMBB->getBasicBlock());
1412 FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
1414 // Emits an unconditional branch to the FalseBB, obtains the branch
1415 // weight, and adds it to the successor list.
1416 FastEmitBranch(FalseMBB, DbgLoc);
1420 } else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
1421 // Handle things like "%cond = trunc i32 %X to i1 / br i1 %cond", which
1422 // typically happen for _Bool and C++ bools.
1424 if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
1425 isTypeLegal(TI->getOperand(0)->getType(), SourceVT)) {
1426 unsigned TestOpc = 0;
1427 switch (SourceVT.SimpleTy) {
1429 case MVT::i8: TestOpc = X86::TEST8ri; break;
1430 case MVT::i16: TestOpc = X86::TEST16ri; break;
1431 case MVT::i32: TestOpc = X86::TEST32ri; break;
1432 case MVT::i64: TestOpc = X86::TEST64ri32; break;
1435 unsigned OpReg = getRegForValue(TI->getOperand(0));
1436 if (OpReg == 0) return false;
1437 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TestOpc))
1438 .addReg(OpReg).addImm(1);
1440 unsigned JmpOpc = X86::JNE_4;
1441 if (FuncInfo.MBB->isLayoutSuccessor(TrueMBB)) {
1442 std::swap(TrueMBB, FalseMBB);
1446 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(JmpOpc))
1448 FastEmitBranch(FalseMBB, DbgLoc);
1449 uint32_t BranchWeight = 0;
1451 BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
1452 TrueMBB->getBasicBlock());
1453 FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
1457 } else if (foldX86XALUIntrinsic(CC, BI, BI->getCondition())) {
1458 // Fake request the condition, otherwise the intrinsic might be completely
1460 unsigned TmpReg = getRegForValue(BI->getCondition());
1464 unsigned BranchOpc = X86::GetCondBranchFromCond(CC);
1466 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(BranchOpc))
1468 FastEmitBranch(FalseMBB, DbgLoc);
1469 uint32_t BranchWeight = 0;
1471 BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
1472 TrueMBB->getBasicBlock());
1473 FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
1477 // Otherwise do a clumsy setcc and re-test it.
1478 // Note that i1 essentially gets ANY_EXTEND'ed to i8 where it isn't used
1479 // in an explicit cast, so make sure to handle that correctly.
1480 unsigned OpReg = getRegForValue(BI->getCondition());
1481 if (OpReg == 0) return false;
1483 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::TEST8ri))
1484 .addReg(OpReg).addImm(1);
1485 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::JNE_4))
1487 FastEmitBranch(FalseMBB, DbgLoc);
1488 uint32_t BranchWeight = 0;
1490 BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
1491 TrueMBB->getBasicBlock());
1492 FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
1496 bool X86FastISel::X86SelectShift(const Instruction *I) {
1497 unsigned CReg = 0, OpReg = 0;
1498 const TargetRegisterClass *RC = nullptr;
1499 if (I->getType()->isIntegerTy(8)) {
1501 RC = &X86::GR8RegClass;
1502 switch (I->getOpcode()) {
1503 case Instruction::LShr: OpReg = X86::SHR8rCL; break;
1504 case Instruction::AShr: OpReg = X86::SAR8rCL; break;
1505 case Instruction::Shl: OpReg = X86::SHL8rCL; break;
1506 default: return false;
1508 } else if (I->getType()->isIntegerTy(16)) {
1510 RC = &X86::GR16RegClass;
1511 switch (I->getOpcode()) {
1512 case Instruction::LShr: OpReg = X86::SHR16rCL; break;
1513 case Instruction::AShr: OpReg = X86::SAR16rCL; break;
1514 case Instruction::Shl: OpReg = X86::SHL16rCL; break;
1515 default: return false;
1517 } else if (I->getType()->isIntegerTy(32)) {
1519 RC = &X86::GR32RegClass;
1520 switch (I->getOpcode()) {
1521 case Instruction::LShr: OpReg = X86::SHR32rCL; break;
1522 case Instruction::AShr: OpReg = X86::SAR32rCL; break;
1523 case Instruction::Shl: OpReg = X86::SHL32rCL; break;
1524 default: return false;
1526 } else if (I->getType()->isIntegerTy(64)) {
1528 RC = &X86::GR64RegClass;
1529 switch (I->getOpcode()) {
1530 case Instruction::LShr: OpReg = X86::SHR64rCL; break;
1531 case Instruction::AShr: OpReg = X86::SAR64rCL; break;
1532 case Instruction::Shl: OpReg = X86::SHL64rCL; break;
1533 default: return false;
1540 if (!isTypeLegal(I->getType(), VT))
1543 unsigned Op0Reg = getRegForValue(I->getOperand(0));
1544 if (Op0Reg == 0) return false;
1546 unsigned Op1Reg = getRegForValue(I->getOperand(1));
1547 if (Op1Reg == 0) return false;
1548 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
1549 CReg).addReg(Op1Reg);
1551 // The shift instruction uses X86::CL. If we defined a super-register
1552 // of X86::CL, emit a subreg KILL to precisely describe what we're doing here.
1553 if (CReg != X86::CL)
1554 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1555 TII.get(TargetOpcode::KILL), X86::CL)
1556 .addReg(CReg, RegState::Kill);
1558 unsigned ResultReg = createResultReg(RC);
1559 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(OpReg), ResultReg)
1561 UpdateValueMap(I, ResultReg);
1565 bool X86FastISel::X86SelectDivRem(const Instruction *I) {
1566 const static unsigned NumTypes = 4; // i8, i16, i32, i64
1567 const static unsigned NumOps = 4; // SDiv, SRem, UDiv, URem
1568 const static bool S = true; // IsSigned
1569 const static bool U = false; // !IsSigned
1570 const static unsigned Copy = TargetOpcode::COPY;
1571 // For the X86 DIV/IDIV instruction, in most cases the dividend
1572 // (numerator) must be in a specific register pair highreg:lowreg,
1573 // producing the quotient in lowreg and the remainder in highreg.
1574 // For most data types, to set up the instruction, the dividend is
1575 // copied into lowreg, and lowreg is sign-extended or zero-extended
1576 // into highreg. The exception is i8, where the dividend is defined
1577 // as a single register rather than a register pair, and we
1578 // therefore directly sign-extend or zero-extend the dividend into
1579 // lowreg, instead of copying, and ignore the highreg.
1580 const static struct DivRemEntry {
1581 // The following portion depends only on the data type.
1582 const TargetRegisterClass *RC;
1583 unsigned LowInReg; // low part of the register pair
1584 unsigned HighInReg; // high part of the register pair
1585 // The following portion depends on both the data type and the operation.
1586 struct DivRemResult {
1587 unsigned OpDivRem; // The specific DIV/IDIV opcode to use.
1588 unsigned OpSignExtend; // Opcode for sign-extending lowreg into
1589 // highreg, or copying a zero into highreg.
1590 unsigned OpCopy; // Opcode for copying dividend into lowreg, or
1591 // zero/sign-extending into lowreg for i8.
1592 unsigned DivRemResultReg; // Register containing the desired result.
1593 bool IsOpSigned; // Whether to use signed or unsigned form.
1594 } ResultTable[NumOps];
1595 } OpTable[NumTypes] = {
1596 { &X86::GR8RegClass, X86::AX, 0, {
1597 { X86::IDIV8r, 0, X86::MOVSX16rr8, X86::AL, S }, // SDiv
1598 { X86::IDIV8r, 0, X86::MOVSX16rr8, X86::AH, S }, // SRem
1599 { X86::DIV8r, 0, X86::MOVZX16rr8, X86::AL, U }, // UDiv
1600 { X86::DIV8r, 0, X86::MOVZX16rr8, X86::AH, U }, // URem
1603 { &X86::GR16RegClass, X86::AX, X86::DX, {
1604 { X86::IDIV16r, X86::CWD, Copy, X86::AX, S }, // SDiv
1605 { X86::IDIV16r, X86::CWD, Copy, X86::DX, S }, // SRem
1606 { X86::DIV16r, X86::MOV32r0, Copy, X86::AX, U }, // UDiv
1607 { X86::DIV16r, X86::MOV32r0, Copy, X86::DX, U }, // URem
1610 { &X86::GR32RegClass, X86::EAX, X86::EDX, {
1611 { X86::IDIV32r, X86::CDQ, Copy, X86::EAX, S }, // SDiv
1612 { X86::IDIV32r, X86::CDQ, Copy, X86::EDX, S }, // SRem
1613 { X86::DIV32r, X86::MOV32r0, Copy, X86::EAX, U }, // UDiv
1614 { X86::DIV32r, X86::MOV32r0, Copy, X86::EDX, U }, // URem
1617 { &X86::GR64RegClass, X86::RAX, X86::RDX, {
1618 { X86::IDIV64r, X86::CQO, Copy, X86::RAX, S }, // SDiv
1619 { X86::IDIV64r, X86::CQO, Copy, X86::RDX, S }, // SRem
1620 { X86::DIV64r, X86::MOV32r0, Copy, X86::RAX, U }, // UDiv
1621 { X86::DIV64r, X86::MOV32r0, Copy, X86::RDX, U }, // URem
1627 if (!isTypeLegal(I->getType(), VT))
1630 unsigned TypeIndex, OpIndex;
1631 switch (VT.SimpleTy) {
1632 default: return false;
1633 case MVT::i8: TypeIndex = 0; break;
1634 case MVT::i16: TypeIndex = 1; break;
1635 case MVT::i32: TypeIndex = 2; break;
1636 case MVT::i64: TypeIndex = 3;
1637 if (!Subtarget->is64Bit())
1642 switch (I->getOpcode()) {
1643 default: llvm_unreachable("Unexpected div/rem opcode");
1644 case Instruction::SDiv: OpIndex = 0; break;
1645 case Instruction::SRem: OpIndex = 1; break;
1646 case Instruction::UDiv: OpIndex = 2; break;
1647 case Instruction::URem: OpIndex = 3; break;
1650 const DivRemEntry &TypeEntry = OpTable[TypeIndex];
1651 const DivRemEntry::DivRemResult &OpEntry = TypeEntry.ResultTable[OpIndex];
1652 unsigned Op0Reg = getRegForValue(I->getOperand(0));
1655 unsigned Op1Reg = getRegForValue(I->getOperand(1));
1659 // Move op0 into low-order input register.
1660 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1661 TII.get(OpEntry.OpCopy), TypeEntry.LowInReg).addReg(Op0Reg);
1662 // Zero-extend or sign-extend into high-order input register.
1663 if (OpEntry.OpSignExtend) {
1664 if (OpEntry.IsOpSigned)
1665 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1666 TII.get(OpEntry.OpSignExtend));
1668 unsigned Zero32 = createResultReg(&X86::GR32RegClass);
1669 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1670 TII.get(X86::MOV32r0), Zero32);
1672 // Copy the zero into the appropriate sub/super/identical physical
1673 // register. Unfortunately the operations needed are not uniform enough to
1674 // fit neatly into the table above.
1675 if (VT.SimpleTy == MVT::i16) {
1676 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1677 TII.get(Copy), TypeEntry.HighInReg)
1678 .addReg(Zero32, 0, X86::sub_16bit);
1679 } else if (VT.SimpleTy == MVT::i32) {
1680 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1681 TII.get(Copy), TypeEntry.HighInReg)
1683 } else if (VT.SimpleTy == MVT::i64) {
1684 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1685 TII.get(TargetOpcode::SUBREG_TO_REG), TypeEntry.HighInReg)
1686 .addImm(0).addReg(Zero32).addImm(X86::sub_32bit);
1690 // Generate the DIV/IDIV instruction.
1691 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1692 TII.get(OpEntry.OpDivRem)).addReg(Op1Reg);
1693 // For i8 remainder, we can't reference AH directly, as we'll end
1694 // up with bogus copies like %R9B = COPY %AH. Reference AX
1695 // instead to prevent AH references in a REX instruction.
1697 // The current assumption of the fast register allocator is that isel
1698 // won't generate explicit references to the GPR8_NOREX registers. If
1699 // the allocator and/or the backend get enhanced to be more robust in
1700 // that regard, this can be, and should be, removed.
1701 unsigned ResultReg = 0;
1702 if ((I->getOpcode() == Instruction::SRem ||
1703 I->getOpcode() == Instruction::URem) &&
1704 OpEntry.DivRemResultReg == X86::AH && Subtarget->is64Bit()) {
1705 unsigned SourceSuperReg = createResultReg(&X86::GR16RegClass);
1706 unsigned ResultSuperReg = createResultReg(&X86::GR16RegClass);
1707 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1708 TII.get(Copy), SourceSuperReg).addReg(X86::AX);
1710 // Shift AX right by 8 bits instead of using AH.
1711 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::SHR16ri),
1712 ResultSuperReg).addReg(SourceSuperReg).addImm(8);
1714 // Now reference the 8-bit subreg of the result.
1715 ResultReg = FastEmitInst_extractsubreg(MVT::i8, ResultSuperReg,
1716 /*Kill=*/true, X86::sub_8bit);
1718 // Copy the result out of the physreg if we haven't already.
1720 ResultReg = createResultReg(TypeEntry.RC);
1721 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Copy), ResultReg)
1722 .addReg(OpEntry.DivRemResultReg);
1724 UpdateValueMap(I, ResultReg);
1729 /// \brief Emit a conditional move instruction (if the are supported) to lower
1731 bool X86FastISel::X86FastEmitCMoveSelect(MVT RetVT, const Instruction *I) {
1732 // Check if the subtarget supports these instructions.
1733 if (!Subtarget->hasCMov())
1736 // FIXME: Add support for i8.
1737 if (RetVT < MVT::i16 || RetVT > MVT::i64)
1740 const Value *Cond = I->getOperand(0);
1741 const TargetRegisterClass *RC = TLI.getRegClassFor(RetVT);
1742 bool NeedTest = true;
1743 X86::CondCode CC = X86::COND_NE;
1745 // Optimize conditions coming from a compare if both instructions are in the
1746 // same basic block (values defined in other basic blocks may not have
1747 // initialized registers).
1748 const auto *CI = dyn_cast<CmpInst>(Cond);
1749 if (CI && (CI->getParent() == I->getParent())) {
1750 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
1752 // FCMP_OEQ and FCMP_UNE cannot be checked with a single instruction.
1753 static unsigned SETFOpcTable[2][3] = {
1754 { X86::SETNPr, X86::SETEr , X86::TEST8rr },
1755 { X86::SETPr, X86::SETNEr, X86::OR8rr }
1757 unsigned *SETFOpc = nullptr;
1758 switch (Predicate) {
1760 case CmpInst::FCMP_OEQ:
1761 SETFOpc = &SETFOpcTable[0][0];
1762 Predicate = CmpInst::ICMP_NE;
1764 case CmpInst::FCMP_UNE:
1765 SETFOpc = &SETFOpcTable[1][0];
1766 Predicate = CmpInst::ICMP_NE;
1771 std::tie(CC, NeedSwap) = getX86ConditionCode(Predicate);
1772 assert(CC <= X86::LAST_VALID_COND && "Unexpected condition code.");
1774 const Value *CmpLHS = CI->getOperand(0);
1775 const Value *CmpRHS = CI->getOperand(1);
1777 std::swap(CmpLHS, CmpRHS);
1779 EVT CmpVT = TLI.getValueType(CmpLHS->getType());
1780 // Emit a compare of the LHS and RHS, setting the flags.
1781 if (!X86FastEmitCompare(CmpLHS, CmpRHS, CmpVT))
1785 unsigned FlagReg1 = createResultReg(&X86::GR8RegClass);
1786 unsigned FlagReg2 = createResultReg(&X86::GR8RegClass);
1787 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(SETFOpc[0]),
1789 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(SETFOpc[1]),
1791 auto const &II = TII.get(SETFOpc[2]);
1792 if (II.getNumDefs()) {
1793 unsigned TmpReg = createResultReg(&X86::GR8RegClass);
1794 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, TmpReg)
1795 .addReg(FlagReg2).addReg(FlagReg1);
1797 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II)
1798 .addReg(FlagReg2).addReg(FlagReg1);
1802 } else if (foldX86XALUIntrinsic(CC, I, Cond)) {
1803 // Fake request the condition, otherwise the intrinsic might be completely
1805 unsigned TmpReg = getRegForValue(Cond);
1813 // Selects operate on i1, however, CondReg is 8 bits width and may contain
1814 // garbage. Indeed, only the less significant bit is supposed to be
1815 // accurate. If we read more than the lsb, we may see non-zero values
1816 // whereas lsb is zero. Therefore, we have to truncate Op0Reg to i1 for
1817 // the select. This is achieved by performing TEST against 1.
1818 unsigned CondReg = getRegForValue(Cond);
1821 bool CondIsKill = hasTrivialKill(Cond);
1823 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::TEST8ri))
1824 .addReg(CondReg, getKillRegState(CondIsKill)).addImm(1);
1827 const Value *LHS = I->getOperand(1);
1828 const Value *RHS = I->getOperand(2);
1830 unsigned RHSReg = getRegForValue(RHS);
1831 bool RHSIsKill = hasTrivialKill(RHS);
1833 unsigned LHSReg = getRegForValue(LHS);
1834 bool LHSIsKill = hasTrivialKill(LHS);
1836 if (!LHSReg || !RHSReg)
1839 unsigned Opc = X86::getCMovFromCond(CC, RC->getSize());
1840 unsigned ResultReg = FastEmitInst_rr(Opc, RC, RHSReg, RHSIsKill,
1842 UpdateValueMap(I, ResultReg);
1846 /// \brief Emit SSE instructions to lower the select.
1848 /// Try to use SSE1/SSE2 instructions to simulate a select without branches.
1849 /// This lowers fp selects into a CMP/AND/ANDN/OR sequence when the necessary
1850 /// SSE instructions are available.
1851 bool X86FastISel::X86FastEmitSSESelect(MVT RetVT, const Instruction *I) {
1852 // Optimize conditions coming from a compare if both instructions are in the
1853 // same basic block (values defined in other basic blocks may not have
1854 // initialized registers).
1855 const auto *CI = dyn_cast<FCmpInst>(I->getOperand(0));
1856 if (!CI || (CI->getParent() != I->getParent()))
1859 if (I->getType() != CI->getOperand(0)->getType() ||
1860 !((Subtarget->hasSSE1() && RetVT == MVT::f32) ||
1861 (Subtarget->hasSSE2() && RetVT == MVT::f64) ))
1864 const Value *CmpLHS = CI->getOperand(0);
1865 const Value *CmpRHS = CI->getOperand(1);
1866 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
1868 // The optimizer might have replaced fcmp oeq %x, %x with fcmp ord %x, 0.0.
1869 // We don't have to materialize a zero constant for this case and can just use
1870 // %x again on the RHS.
1871 if (Predicate == CmpInst::FCMP_ORD || Predicate == CmpInst::FCMP_UNO) {
1872 const auto *CmpRHSC = dyn_cast<ConstantFP>(CmpRHS);
1873 if (CmpRHSC && CmpRHSC->isNullValue())
1879 std::tie(CC, NeedSwap) = getX86SSEConditionCode(Predicate);
1884 std::swap(CmpLHS, CmpRHS);
1886 static unsigned OpcTable[2][2][4] = {
1887 { { X86::CMPSSrr, X86::FsANDPSrr, X86::FsANDNPSrr, X86::FsORPSrr },
1888 { X86::VCMPSSrr, X86::VFsANDPSrr, X86::VFsANDNPSrr, X86::VFsORPSrr } },
1889 { { X86::CMPSDrr, X86::FsANDPDrr, X86::FsANDNPDrr, X86::FsORPDrr },
1890 { X86::VCMPSDrr, X86::VFsANDPDrr, X86::VFsANDNPDrr, X86::VFsORPDrr } }
1893 bool HasAVX = Subtarget->hasAVX();
1894 unsigned *Opc = nullptr;
1895 switch (RetVT.SimpleTy) {
1896 default: return false;
1897 case MVT::f32: Opc = &OpcTable[0][HasAVX][0]; break;
1898 case MVT::f64: Opc = &OpcTable[1][HasAVX][0]; break;
1901 const Value *LHS = I->getOperand(1);
1902 const Value *RHS = I->getOperand(2);
1904 unsigned LHSReg = getRegForValue(LHS);
1905 bool LHSIsKill = hasTrivialKill(LHS);
1907 unsigned RHSReg = getRegForValue(RHS);
1908 bool RHSIsKill = hasTrivialKill(RHS);
1910 unsigned CmpLHSReg = getRegForValue(CmpLHS);
1911 bool CmpLHSIsKill = hasTrivialKill(CmpLHS);
1913 unsigned CmpRHSReg = getRegForValue(CmpRHS);
1914 bool CmpRHSIsKill = hasTrivialKill(CmpRHS);
1916 if (!LHSReg || !RHSReg || !CmpLHS || !CmpRHS)
1919 const TargetRegisterClass *RC = TLI.getRegClassFor(RetVT);
1920 unsigned CmpReg = FastEmitInst_rri(Opc[0], RC, CmpLHSReg, CmpLHSIsKill,
1921 CmpRHSReg, CmpRHSIsKill, CC);
1922 unsigned AndReg = FastEmitInst_rr(Opc[1], RC, CmpReg, /*IsKill=*/false,
1924 unsigned AndNReg = FastEmitInst_rr(Opc[2], RC, CmpReg, /*IsKill=*/true,
1926 unsigned ResultReg = FastEmitInst_rr(Opc[3], RC, AndNReg, /*IsKill=*/true,
1927 AndReg, /*IsKill=*/true);
1928 UpdateValueMap(I, ResultReg);
1932 bool X86FastISel::X86FastEmitPseudoSelect(MVT RetVT, const Instruction *I) {
1933 // These are pseudo CMOV instructions and will be later expanded into control-
1936 switch (RetVT.SimpleTy) {
1937 default: return false;
1938 case MVT::i8: Opc = X86::CMOV_GR8; break;
1939 case MVT::i16: Opc = X86::CMOV_GR16; break;
1940 case MVT::i32: Opc = X86::CMOV_GR32; break;
1941 case MVT::f32: Opc = X86::CMOV_FR32; break;
1942 case MVT::f64: Opc = X86::CMOV_FR64; break;
1945 const Value *Cond = I->getOperand(0);
1946 X86::CondCode CC = X86::COND_NE;
1948 // Optimize conditions coming from a compare if both instructions are in the
1949 // same basic block (values defined in other basic blocks may not have
1950 // initialized registers).
1951 const auto *CI = dyn_cast<CmpInst>(Cond);
1952 if (CI && (CI->getParent() == I->getParent())) {
1954 std::tie(CC, NeedSwap) = getX86ConditionCode(CI->getPredicate());
1955 if (CC > X86::LAST_VALID_COND)
1958 const Value *CmpLHS = CI->getOperand(0);
1959 const Value *CmpRHS = CI->getOperand(1);
1962 std::swap(CmpLHS, CmpRHS);
1964 EVT CmpVT = TLI.getValueType(CmpLHS->getType());
1965 if (!X86FastEmitCompare(CmpLHS, CmpRHS, CmpVT))
1968 unsigned CondReg = getRegForValue(Cond);
1971 bool CondIsKill = hasTrivialKill(Cond);
1972 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::TEST8ri))
1973 .addReg(CondReg, getKillRegState(CondIsKill)).addImm(1);
1976 const Value *LHS = I->getOperand(1);
1977 const Value *RHS = I->getOperand(2);
1979 unsigned LHSReg = getRegForValue(LHS);
1980 bool LHSIsKill = hasTrivialKill(LHS);
1982 unsigned RHSReg = getRegForValue(RHS);
1983 bool RHSIsKill = hasTrivialKill(RHS);
1985 if (!LHSReg || !RHSReg)
1988 const TargetRegisterClass *RC = TLI.getRegClassFor(RetVT);
1990 unsigned ResultReg =
1991 FastEmitInst_rri(Opc, RC, RHSReg, RHSIsKill, LHSReg, LHSIsKill, CC);
1992 UpdateValueMap(I, ResultReg);
1996 bool X86FastISel::X86SelectSelect(const Instruction *I) {
1998 if (!isTypeLegal(I->getType(), RetVT))
2001 // Check if we can fold the select.
2002 if (const auto *CI = dyn_cast<CmpInst>(I->getOperand(0))) {
2003 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2004 const Value *Opnd = nullptr;
2005 switch (Predicate) {
2007 case CmpInst::FCMP_FALSE: Opnd = I->getOperand(2); break;
2008 case CmpInst::FCMP_TRUE: Opnd = I->getOperand(1); break;
2010 // No need for a select anymore - this is an unconditional move.
2012 unsigned OpReg = getRegForValue(Opnd);
2015 bool OpIsKill = hasTrivialKill(Opnd);
2016 const TargetRegisterClass *RC = TLI.getRegClassFor(RetVT);
2017 unsigned ResultReg = createResultReg(RC);
2018 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2019 TII.get(TargetOpcode::COPY), ResultReg)
2020 .addReg(OpReg, getKillRegState(OpIsKill));
2021 UpdateValueMap(I, ResultReg);
2026 // First try to use real conditional move instructions.
2027 if (X86FastEmitCMoveSelect(RetVT, I))
2030 // Try to use a sequence of SSE instructions to simulate a conditional move.
2031 if (X86FastEmitSSESelect(RetVT, I))
2034 // Fall-back to pseudo conditional move instructions, which will be later
2035 // converted to control-flow.
2036 if (X86FastEmitPseudoSelect(RetVT, I))
2042 bool X86FastISel::X86SelectFPExt(const Instruction *I) {
2043 // fpext from float to double.
2044 if (X86ScalarSSEf64 &&
2045 I->getType()->isDoubleTy()) {
2046 const Value *V = I->getOperand(0);
2047 if (V->getType()->isFloatTy()) {
2048 unsigned OpReg = getRegForValue(V);
2049 if (OpReg == 0) return false;
2050 unsigned ResultReg = createResultReg(&X86::FR64RegClass);
2051 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2052 TII.get(X86::CVTSS2SDrr), ResultReg)
2054 UpdateValueMap(I, ResultReg);
2062 bool X86FastISel::X86SelectFPTrunc(const Instruction *I) {
2063 if (X86ScalarSSEf64) {
2064 if (I->getType()->isFloatTy()) {
2065 const Value *V = I->getOperand(0);
2066 if (V->getType()->isDoubleTy()) {
2067 unsigned OpReg = getRegForValue(V);
2068 if (OpReg == 0) return false;
2069 unsigned ResultReg = createResultReg(&X86::FR32RegClass);
2070 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2071 TII.get(X86::CVTSD2SSrr), ResultReg)
2073 UpdateValueMap(I, ResultReg);
2082 bool X86FastISel::X86SelectTrunc(const Instruction *I) {
2083 EVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
2084 EVT DstVT = TLI.getValueType(I->getType());
2086 // This code only handles truncation to byte.
2087 if (DstVT != MVT::i8 && DstVT != MVT::i1)
2089 if (!TLI.isTypeLegal(SrcVT))
2092 unsigned InputReg = getRegForValue(I->getOperand(0));
2094 // Unhandled operand. Halt "fast" selection and bail.
2097 if (SrcVT == MVT::i8) {
2098 // Truncate from i8 to i1; no code needed.
2099 UpdateValueMap(I, InputReg);
2103 if (!Subtarget->is64Bit()) {
2104 // If we're on x86-32; we can't extract an i8 from a general register.
2105 // First issue a copy to GR16_ABCD or GR32_ABCD.
2106 const TargetRegisterClass *CopyRC = (SrcVT == MVT::i16) ?
2107 (const TargetRegisterClass*)&X86::GR16_ABCDRegClass :
2108 (const TargetRegisterClass*)&X86::GR32_ABCDRegClass;
2109 unsigned CopyReg = createResultReg(CopyRC);
2110 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
2111 CopyReg).addReg(InputReg);
2115 // Issue an extract_subreg.
2116 unsigned ResultReg = FastEmitInst_extractsubreg(MVT::i8,
2117 InputReg, /*Kill=*/true,
2122 UpdateValueMap(I, ResultReg);
2126 bool X86FastISel::IsMemcpySmall(uint64_t Len) {
2127 return Len <= (Subtarget->is64Bit() ? 32 : 16);
2130 bool X86FastISel::TryEmitSmallMemcpy(X86AddressMode DestAM,
2131 X86AddressMode SrcAM, uint64_t Len) {
2133 // Make sure we don't bloat code by inlining very large memcpy's.
2134 if (!IsMemcpySmall(Len))
2137 bool i64Legal = Subtarget->is64Bit();
2139 // We don't care about alignment here since we just emit integer accesses.
2142 if (Len >= 8 && i64Legal)
2153 bool RV = X86FastEmitLoad(VT, SrcAM, nullptr, Reg);
2154 RV &= X86FastEmitStore(VT, Reg, /*Kill=*/true, DestAM);
2155 assert(RV && "Failed to emit load or store??");
2157 unsigned Size = VT.getSizeInBits()/8;
2159 DestAM.Disp += Size;
2166 bool X86FastISel::FastLowerIntrinsicCall(const IntrinsicInst *II) {
2167 // FIXME: Handle more intrinsics.
2168 switch (II->getIntrinsicID()) {
2169 default: return false;
2170 case Intrinsic::frameaddress: {
2171 Type *RetTy = II->getCalledFunction()->getReturnType();
2174 if (!isTypeLegal(RetTy, VT))
2178 const TargetRegisterClass *RC = nullptr;
2180 switch (VT.SimpleTy) {
2181 default: llvm_unreachable("Invalid result type for frameaddress.");
2182 case MVT::i32: Opc = X86::MOV32rm; RC = &X86::GR32RegClass; break;
2183 case MVT::i64: Opc = X86::MOV64rm; RC = &X86::GR64RegClass; break;
2186 // This needs to be set before we call getFrameRegister, otherwise we get
2187 // the wrong frame register.
2188 MachineFrameInfo *MFI = FuncInfo.MF->getFrameInfo();
2189 MFI->setFrameAddressIsTaken(true);
2191 const X86RegisterInfo *RegInfo =
2192 static_cast<const X86RegisterInfo*>(TM.getRegisterInfo());
2193 unsigned FrameReg = RegInfo->getFrameRegister(*(FuncInfo.MF));
2194 assert(((FrameReg == X86::RBP && VT == MVT::i64) ||
2195 (FrameReg == X86::EBP && VT == MVT::i32)) &&
2196 "Invalid Frame Register!");
2198 // Always make a copy of the frame register to to a vreg first, so that we
2199 // never directly reference the frame register (the TwoAddressInstruction-
2200 // Pass doesn't like that).
2201 unsigned SrcReg = createResultReg(RC);
2202 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2203 TII.get(TargetOpcode::COPY), SrcReg).addReg(FrameReg);
2205 // Now recursively load from the frame address.
2206 // movq (%rbp), %rax
2207 // movq (%rax), %rax
2208 // movq (%rax), %rax
2211 unsigned Depth = cast<ConstantInt>(II->getOperand(0))->getZExtValue();
2213 DestReg = createResultReg(RC);
2214 addDirectMem(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2215 TII.get(Opc), DestReg), SrcReg);
2219 UpdateValueMap(II, SrcReg);
2222 case Intrinsic::memcpy: {
2223 const MemCpyInst *MCI = cast<MemCpyInst>(II);
2224 // Don't handle volatile or variable length memcpys.
2225 if (MCI->isVolatile())
2228 if (isa<ConstantInt>(MCI->getLength())) {
2229 // Small memcpy's are common enough that we want to do them
2230 // without a call if possible.
2231 uint64_t Len = cast<ConstantInt>(MCI->getLength())->getZExtValue();
2232 if (IsMemcpySmall(Len)) {
2233 X86AddressMode DestAM, SrcAM;
2234 if (!X86SelectAddress(MCI->getRawDest(), DestAM) ||
2235 !X86SelectAddress(MCI->getRawSource(), SrcAM))
2237 TryEmitSmallMemcpy(DestAM, SrcAM, Len);
2242 unsigned SizeWidth = Subtarget->is64Bit() ? 64 : 32;
2243 if (!MCI->getLength()->getType()->isIntegerTy(SizeWidth))
2246 if (MCI->getSourceAddressSpace() > 255 || MCI->getDestAddressSpace() > 255)
2249 return LowerCallTo(II, "memcpy", II->getNumArgOperands() - 2);
2251 case Intrinsic::memset: {
2252 const MemSetInst *MSI = cast<MemSetInst>(II);
2254 if (MSI->isVolatile())
2257 unsigned SizeWidth = Subtarget->is64Bit() ? 64 : 32;
2258 if (!MSI->getLength()->getType()->isIntegerTy(SizeWidth))
2261 if (MSI->getDestAddressSpace() > 255)
2264 return LowerCallTo(II, "memset", II->getNumArgOperands() - 2);
2266 case Intrinsic::stackprotector: {
2267 // Emit code to store the stack guard onto the stack.
2268 EVT PtrTy = TLI.getPointerTy();
2270 const Value *Op1 = II->getArgOperand(0); // The guard's value.
2271 const AllocaInst *Slot = cast<AllocaInst>(II->getArgOperand(1));
2273 MFI.setStackProtectorIndex(FuncInfo.StaticAllocaMap[Slot]);
2275 // Grab the frame index.
2277 if (!X86SelectAddress(Slot, AM)) return false;
2278 if (!X86FastEmitStore(PtrTy, Op1, AM)) return false;
2281 case Intrinsic::dbg_declare: {
2282 const DbgDeclareInst *DI = cast<DbgDeclareInst>(II);
2284 assert(DI->getAddress() && "Null address should be checked earlier!");
2285 if (!X86SelectAddress(DI->getAddress(), AM))
2287 const MCInstrDesc &II = TII.get(TargetOpcode::DBG_VALUE);
2288 // FIXME may need to add RegState::Debug to any registers produced,
2289 // although ESP/EBP should be the only ones at the moment.
2290 addFullAddress(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II), AM).
2291 addImm(0).addMetadata(DI->getVariable());
2294 case Intrinsic::trap: {
2295 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::TRAP));
2298 case Intrinsic::sqrt: {
2299 if (!Subtarget->hasSSE1())
2302 Type *RetTy = II->getCalledFunction()->getReturnType();
2305 if (!isTypeLegal(RetTy, VT))
2308 // Unfortunately we can't use FastEmit_r, because the AVX version of FSQRT
2309 // is not generated by FastISel yet.
2310 // FIXME: Update this code once tablegen can handle it.
2311 static const unsigned SqrtOpc[2][2] = {
2312 {X86::SQRTSSr, X86::VSQRTSSr},
2313 {X86::SQRTSDr, X86::VSQRTSDr}
2315 bool HasAVX = Subtarget->hasAVX();
2317 const TargetRegisterClass *RC;
2318 switch (VT.SimpleTy) {
2319 default: return false;
2320 case MVT::f32: Opc = SqrtOpc[0][HasAVX]; RC = &X86::FR32RegClass; break;
2321 case MVT::f64: Opc = SqrtOpc[1][HasAVX]; RC = &X86::FR64RegClass; break;
2324 const Value *SrcVal = II->getArgOperand(0);
2325 unsigned SrcReg = getRegForValue(SrcVal);
2330 unsigned ImplicitDefReg = 0;
2332 ImplicitDefReg = createResultReg(RC);
2333 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2334 TII.get(TargetOpcode::IMPLICIT_DEF), ImplicitDefReg);
2337 unsigned ResultReg = createResultReg(RC);
2338 MachineInstrBuilder MIB;
2339 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc),
2343 MIB.addReg(ImplicitDefReg);
2347 UpdateValueMap(II, ResultReg);
2350 case Intrinsic::sadd_with_overflow:
2351 case Intrinsic::uadd_with_overflow:
2352 case Intrinsic::ssub_with_overflow:
2353 case Intrinsic::usub_with_overflow:
2354 case Intrinsic::smul_with_overflow:
2355 case Intrinsic::umul_with_overflow: {
2356 // This implements the basic lowering of the xalu with overflow intrinsics
2357 // into add/sub/mul followed by either seto or setb.
2358 const Function *Callee = II->getCalledFunction();
2359 auto *Ty = cast<StructType>(Callee->getReturnType());
2360 Type *RetTy = Ty->getTypeAtIndex(0U);
2361 Type *CondTy = Ty->getTypeAtIndex(1);
2364 if (!isTypeLegal(RetTy, VT))
2367 if (VT < MVT::i8 || VT > MVT::i64)
2370 const Value *LHS = II->getArgOperand(0);
2371 const Value *RHS = II->getArgOperand(1);
2373 // Canonicalize immediate to the RHS.
2374 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS) &&
2375 isCommutativeIntrinsic(II))
2376 std::swap(LHS, RHS);
2378 unsigned BaseOpc, CondOpc;
2379 switch (II->getIntrinsicID()) {
2380 default: llvm_unreachable("Unexpected intrinsic!");
2381 case Intrinsic::sadd_with_overflow:
2382 BaseOpc = ISD::ADD; CondOpc = X86::SETOr; break;
2383 case Intrinsic::uadd_with_overflow:
2384 BaseOpc = ISD::ADD; CondOpc = X86::SETBr; break;
2385 case Intrinsic::ssub_with_overflow:
2386 BaseOpc = ISD::SUB; CondOpc = X86::SETOr; break;
2387 case Intrinsic::usub_with_overflow:
2388 BaseOpc = ISD::SUB; CondOpc = X86::SETBr; break;
2389 case Intrinsic::smul_with_overflow:
2390 BaseOpc = X86ISD::SMUL; CondOpc = X86::SETOr; break;
2391 case Intrinsic::umul_with_overflow:
2392 BaseOpc = X86ISD::UMUL; CondOpc = X86::SETOr; break;
2395 unsigned LHSReg = getRegForValue(LHS);
2398 bool LHSIsKill = hasTrivialKill(LHS);
2400 unsigned ResultReg = 0;
2401 // Check if we have an immediate version.
2402 if (auto const *C = dyn_cast<ConstantInt>(RHS)) {
2403 ResultReg = FastEmit_ri(VT, VT, BaseOpc, LHSReg, LHSIsKill,
2410 RHSReg = getRegForValue(RHS);
2413 RHSIsKill = hasTrivialKill(RHS);
2414 ResultReg = FastEmit_rr(VT, VT, BaseOpc, LHSReg, LHSIsKill, RHSReg,
2418 // FastISel doesn't have a pattern for all X86::MUL*r and X86::IMUL*r. Emit
2420 if (BaseOpc == X86ISD::UMUL && !ResultReg) {
2421 static const unsigned MULOpc[] =
2422 { X86::MUL8r, X86::MUL16r, X86::MUL32r, X86::MUL64r };
2423 static const unsigned Reg[] = { X86::AL, X86::AX, X86::EAX, X86::RAX };
2424 // First copy the first operand into RAX, which is an implicit input to
2425 // the X86::MUL*r instruction.
2426 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2427 TII.get(TargetOpcode::COPY), Reg[VT.SimpleTy-MVT::i8])
2428 .addReg(LHSReg, getKillRegState(LHSIsKill));
2429 ResultReg = FastEmitInst_r(MULOpc[VT.SimpleTy-MVT::i8],
2430 TLI.getRegClassFor(VT), RHSReg, RHSIsKill);
2431 } else if (BaseOpc == X86ISD::SMUL && !ResultReg) {
2432 static const unsigned MULOpc[] =
2433 { X86::IMUL8r, X86::IMUL16rr, X86::IMUL32rr, X86::IMUL64rr };
2434 if (VT == MVT::i8) {
2435 // Copy the first operand into AL, which is an implicit input to the
2436 // X86::IMUL8r instruction.
2437 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2438 TII.get(TargetOpcode::COPY), X86::AL)
2439 .addReg(LHSReg, getKillRegState(LHSIsKill));
2440 ResultReg = FastEmitInst_r(MULOpc[0], TLI.getRegClassFor(VT), RHSReg,
2443 ResultReg = FastEmitInst_rr(MULOpc[VT.SimpleTy-MVT::i8],
2444 TLI.getRegClassFor(VT), LHSReg, LHSIsKill,
2451 unsigned ResultReg2 = FuncInfo.CreateRegs(CondTy);
2452 assert((ResultReg+1) == ResultReg2 && "Nonconsecutive result registers.");
2453 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CondOpc),
2456 UpdateValueMap(II, ResultReg, 2);
2459 case Intrinsic::x86_sse_cvttss2si:
2460 case Intrinsic::x86_sse_cvttss2si64:
2461 case Intrinsic::x86_sse2_cvttsd2si:
2462 case Intrinsic::x86_sse2_cvttsd2si64: {
2464 switch (II->getIntrinsicID()) {
2465 default: llvm_unreachable("Unexpected intrinsic.");
2466 case Intrinsic::x86_sse_cvttss2si:
2467 case Intrinsic::x86_sse_cvttss2si64:
2468 if (!Subtarget->hasSSE1())
2470 IsInputDouble = false;
2472 case Intrinsic::x86_sse2_cvttsd2si:
2473 case Intrinsic::x86_sse2_cvttsd2si64:
2474 if (!Subtarget->hasSSE2())
2476 IsInputDouble = true;
2480 Type *RetTy = II->getCalledFunction()->getReturnType();
2482 if (!isTypeLegal(RetTy, VT))
2485 static const unsigned CvtOpc[2][2][2] = {
2486 { { X86::CVTTSS2SIrr, X86::VCVTTSS2SIrr },
2487 { X86::CVTTSS2SI64rr, X86::VCVTTSS2SI64rr } },
2488 { { X86::CVTTSD2SIrr, X86::VCVTTSD2SIrr },
2489 { X86::CVTTSD2SI64rr, X86::VCVTTSD2SI64rr } }
2491 bool HasAVX = Subtarget->hasAVX();
2493 switch (VT.SimpleTy) {
2494 default: llvm_unreachable("Unexpected result type.");
2495 case MVT::i32: Opc = CvtOpc[IsInputDouble][0][HasAVX]; break;
2496 case MVT::i64: Opc = CvtOpc[IsInputDouble][1][HasAVX]; break;
2499 // Check if we can fold insertelement instructions into the convert.
2500 const Value *Op = II->getArgOperand(0);
2501 while (auto *IE = dyn_cast<InsertElementInst>(Op)) {
2502 const Value *Index = IE->getOperand(2);
2503 if (!isa<ConstantInt>(Index))
2505 unsigned Idx = cast<ConstantInt>(Index)->getZExtValue();
2508 Op = IE->getOperand(1);
2511 Op = IE->getOperand(0);
2514 unsigned Reg = getRegForValue(Op);
2518 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
2519 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
2522 UpdateValueMap(II, ResultReg);
2528 bool X86FastISel::FastLowerArguments() {
2529 if (!FuncInfo.CanLowerReturn)
2532 const Function *F = FuncInfo.Fn;
2536 CallingConv::ID CC = F->getCallingConv();
2537 if (CC != CallingConv::C)
2540 if (Subtarget->isCallingConvWin64(CC))
2543 if (!Subtarget->is64Bit())
2546 // Only handle simple cases. i.e. Up to 6 i32/i64 scalar arguments.
2547 unsigned GPRCnt = 0;
2548 unsigned FPRCnt = 0;
2550 for (auto const &Arg : F->args()) {
2551 // The first argument is at index 1.
2553 if (F->getAttributes().hasAttribute(Idx, Attribute::ByVal) ||
2554 F->getAttributes().hasAttribute(Idx, Attribute::InReg) ||
2555 F->getAttributes().hasAttribute(Idx, Attribute::StructRet) ||
2556 F->getAttributes().hasAttribute(Idx, Attribute::Nest))
2559 Type *ArgTy = Arg.getType();
2560 if (ArgTy->isStructTy() || ArgTy->isArrayTy() || ArgTy->isVectorTy())
2563 EVT ArgVT = TLI.getValueType(ArgTy);
2564 if (!ArgVT.isSimple()) return false;
2565 switch (ArgVT.getSimpleVT().SimpleTy) {
2566 default: return false;
2573 if (!Subtarget->hasSSE1())
2586 static const MCPhysReg GPR32ArgRegs[] = {
2587 X86::EDI, X86::ESI, X86::EDX, X86::ECX, X86::R8D, X86::R9D
2589 static const MCPhysReg GPR64ArgRegs[] = {
2590 X86::RDI, X86::RSI, X86::RDX, X86::RCX, X86::R8 , X86::R9
2592 static const MCPhysReg XMMArgRegs[] = {
2593 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
2594 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
2597 unsigned GPRIdx = 0;
2598 unsigned FPRIdx = 0;
2599 for (auto const &Arg : F->args()) {
2600 MVT VT = TLI.getSimpleValueType(Arg.getType());
2601 const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
2603 switch (VT.SimpleTy) {
2604 default: llvm_unreachable("Unexpected value type.");
2605 case MVT::i32: SrcReg = GPR32ArgRegs[GPRIdx++]; break;
2606 case MVT::i64: SrcReg = GPR64ArgRegs[GPRIdx++]; break;
2607 case MVT::f32: // fall-through
2608 case MVT::f64: SrcReg = XMMArgRegs[FPRIdx++]; break;
2610 unsigned DstReg = FuncInfo.MF->addLiveIn(SrcReg, RC);
2611 // FIXME: Unfortunately it's necessary to emit a copy from the livein copy.
2612 // Without this, EmitLiveInCopies may eliminate the livein if its only
2613 // use is a bitcast (which isn't turned into an instruction).
2614 unsigned ResultReg = createResultReg(RC);
2615 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2616 TII.get(TargetOpcode::COPY), ResultReg)
2617 .addReg(DstReg, getKillRegState(true));
2618 UpdateValueMap(&Arg, ResultReg);
2623 static unsigned computeBytesPoppedByCallee(const X86Subtarget *Subtarget,
2625 ImmutableCallSite *CS) {
2626 if (Subtarget->is64Bit())
2628 if (Subtarget->getTargetTriple().isOSMSVCRT())
2630 if (CC == CallingConv::Fast || CC == CallingConv::GHC ||
2631 CC == CallingConv::HiPE)
2633 if (CS && !CS->paramHasAttr(1, Attribute::StructRet))
2635 if (CS && CS->paramHasAttr(1, Attribute::InReg))
2640 bool X86FastISel::FastLowerCall(CallLoweringInfo &CLI) {
2641 auto &OutVals = CLI.OutVals;
2642 auto &OutFlags = CLI.OutFlags;
2643 auto &OutRegs = CLI.OutRegs;
2644 auto &Ins = CLI.Ins;
2645 auto &InRegs = CLI.InRegs;
2646 CallingConv::ID CC = CLI.CallConv;
2647 bool &IsTailCall = CLI.IsTailCall;
2648 bool IsVarArg = CLI.IsVarArg;
2649 const Value *Callee = CLI.Callee;
2650 const char *SymName = CLI.SymName;
2652 bool Is64Bit = Subtarget->is64Bit();
2653 bool IsWin64 = Subtarget->isCallingConvWin64(CC);
2655 // Handle only C, fastcc, and webkit_js calling conventions for now.
2657 default: return false;
2658 case CallingConv::C:
2659 case CallingConv::Fast:
2660 case CallingConv::WebKit_JS:
2661 case CallingConv::X86_FastCall:
2662 case CallingConv::X86_64_Win64:
2663 case CallingConv::X86_64_SysV:
2667 // Allow SelectionDAG isel to handle tail calls.
2671 // fastcc with -tailcallopt is intended to provide a guaranteed
2672 // tail call optimization. Fastisel doesn't know how to do that.
2673 if (CC == CallingConv::Fast && TM.Options.GuaranteedTailCallOpt)
2676 // Don't know how to handle Win64 varargs yet. Nothing special needed for
2677 // x86-32. Special handling for x86-64 is implemented.
2678 if (IsVarArg && IsWin64)
2681 // Don't know about inalloca yet.
2682 if (CLI.CS && CLI.CS->hasInAllocaArgument())
2685 // Fast-isel doesn't know about callee-pop yet.
2686 if (X86::isCalleePop(CC, Subtarget->is64Bit(), IsVarArg,
2687 TM.Options.GuaranteedTailCallOpt))
2690 // If this is a constant i1/i8/i16 argument, promote to i32 to avoid an extra
2691 // instruction. This is safe because it is common to all FastISel supported
2692 // calling conventions on x86.
2693 for (int i = 0, e = OutVals.size(); i != e; ++i) {
2694 Value *&Val = OutVals[i];
2695 ISD::ArgFlagsTy Flags = OutFlags[i];
2696 if (auto *CI = dyn_cast<ConstantInt>(Val)) {
2697 if (CI->getBitWidth() < 32) {
2699 Val = ConstantExpr::getSExt(CI, Type::getInt32Ty(CI->getContext()));
2701 Val = ConstantExpr::getZExt(CI, Type::getInt32Ty(CI->getContext()));
2705 // Passing bools around ends up doing a trunc to i1 and passing it.
2706 // Codegen this as an argument + "and 1".
2707 if (auto *TI = dyn_cast<TruncInst>(Val)) {
2708 if (TI->getType()->isIntegerTy(1) && CLI.CS &&
2709 (TI->getParent() == CLI.CS->getInstruction()->getParent()) &&
2711 Val = cast<TruncInst>(Val)->getOperand(0);
2712 unsigned ResultReg = getRegForValue(Val);
2718 if (!isTypeLegal(Val->getType(), ArgVT))
2722 FastEmit_ri(ArgVT, ArgVT, ISD::AND, ResultReg, Val->hasOneUse(), 1);
2726 UpdateValueMap(Val, ResultReg);
2731 // Analyze operands of the call, assigning locations to each operand.
2732 SmallVector<CCValAssign, 16> ArgLocs;
2733 CCState CCInfo(CC, IsVarArg, *FuncInfo.MF, TM, ArgLocs,
2734 CLI.RetTy->getContext());
2736 // Allocate shadow area for Win64
2738 CCInfo.AllocateStack(32, 8);
2740 SmallVector<MVT, 16> OutVTs;
2741 for (auto *Val : OutVals) {
2743 if (!isTypeLegal(Val->getType(), VT))
2745 OutVTs.push_back(VT);
2747 CCInfo.AnalyzeCallOperands(OutVTs, OutFlags, CC_X86);
2749 // Get a count of how many bytes are to be pushed on the stack.
2750 unsigned NumBytes = CCInfo.getNextStackOffset();
2752 // Issue CALLSEQ_START
2753 unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
2754 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackDown))
2757 // Walk the register/memloc assignments, inserting copies/loads.
2758 const X86RegisterInfo *RegInfo =
2759 static_cast<const X86RegisterInfo *>(TM.getRegisterInfo());
2760 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2761 CCValAssign const &VA = ArgLocs[i];
2762 const Value *ArgVal = OutVals[VA.getValNo()];
2763 MVT ArgVT = OutVTs[VA.getValNo()];
2765 if (ArgVT == MVT::x86mmx)
2768 unsigned ArgReg = getRegForValue(ArgVal);
2772 // Promote the value if needed.
2773 switch (VA.getLocInfo()) {
2774 case CCValAssign::Full: break;
2775 case CCValAssign::SExt: {
2776 assert(VA.getLocVT().isInteger() && !VA.getLocVT().isVector() &&
2777 "Unexpected extend");
2778 bool Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(), ArgReg,
2780 assert(Emitted && "Failed to emit a sext!"); (void)Emitted;
2781 ArgVT = VA.getLocVT();
2784 case CCValAssign::ZExt: {
2785 assert(VA.getLocVT().isInteger() && !VA.getLocVT().isVector() &&
2786 "Unexpected extend");
2787 bool Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(), ArgReg,
2789 assert(Emitted && "Failed to emit a zext!"); (void)Emitted;
2790 ArgVT = VA.getLocVT();
2793 case CCValAssign::AExt: {
2794 assert(VA.getLocVT().isInteger() && !VA.getLocVT().isVector() &&
2795 "Unexpected extend");
2796 bool Emitted = X86FastEmitExtend(ISD::ANY_EXTEND, VA.getLocVT(), ArgReg,
2799 Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(), ArgReg,
2802 Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(), ArgReg,
2805 assert(Emitted && "Failed to emit a aext!"); (void)Emitted;
2806 ArgVT = VA.getLocVT();
2809 case CCValAssign::BCvt: {
2810 ArgReg = FastEmit_r(ArgVT, VA.getLocVT(), ISD::BITCAST, ArgReg,
2811 /*TODO: Kill=*/false);
2812 assert(ArgReg && "Failed to emit a bitcast!");
2813 ArgVT = VA.getLocVT();
2816 case CCValAssign::VExt:
2817 // VExt has not been implemented, so this should be impossible to reach
2818 // for now. However, fallback to Selection DAG isel once implemented.
2820 case CCValAssign::FPExt:
2821 llvm_unreachable("Unexpected loc info!");
2822 case CCValAssign::Indirect:
2823 // FIXME: Indirect doesn't need extending, but fast-isel doesn't fully
2828 if (VA.isRegLoc()) {
2829 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2830 TII.get(TargetOpcode::COPY), VA.getLocReg()).addReg(ArgReg);
2831 OutRegs.push_back(VA.getLocReg());
2833 assert(VA.isMemLoc());
2835 // Don't emit stores for undef values.
2836 if (isa<UndefValue>(ArgVal))
2839 unsigned LocMemOffset = VA.getLocMemOffset();
2841 AM.Base.Reg = RegInfo->getStackRegister();
2842 AM.Disp = LocMemOffset;
2843 ISD::ArgFlagsTy Flags = OutFlags[VA.getValNo()];
2844 unsigned Alignment = DL.getABITypeAlignment(ArgVal->getType());
2845 MachineMemOperand *MMO = FuncInfo.MF->getMachineMemOperand(
2846 MachinePointerInfo::getStack(LocMemOffset), MachineMemOperand::MOStore,
2847 ArgVT.getStoreSize(), Alignment);
2848 if (Flags.isByVal()) {
2849 X86AddressMode SrcAM;
2850 SrcAM.Base.Reg = ArgReg;
2851 if (!TryEmitSmallMemcpy(AM, SrcAM, Flags.getByValSize()))
2853 } else if (isa<ConstantInt>(ArgVal) || isa<ConstantPointerNull>(ArgVal)) {
2854 // If this is a really simple value, emit this with the Value* version
2855 // of X86FastEmitStore. If it isn't simple, we don't want to do this,
2856 // as it can cause us to reevaluate the argument.
2857 if (!X86FastEmitStore(ArgVT, ArgVal, AM, MMO))
2860 bool ValIsKill = hasTrivialKill(ArgVal);
2861 if (!X86FastEmitStore(ArgVT, ArgReg, ValIsKill, AM, MMO))
2867 // ELF / PIC requires GOT in the EBX register before function calls via PLT
2869 if (Subtarget->isPICStyleGOT()) {
2870 unsigned Base = getInstrInfo()->getGlobalBaseReg(FuncInfo.MF);
2871 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2872 TII.get(TargetOpcode::COPY), X86::EBX).addReg(Base);
2875 if (Is64Bit && IsVarArg && !IsWin64) {
2876 // From AMD64 ABI document:
2877 // For calls that may call functions that use varargs or stdargs
2878 // (prototype-less calls or calls to functions containing ellipsis (...) in
2879 // the declaration) %al is used as hidden argument to specify the number
2880 // of SSE registers used. The contents of %al do not need to match exactly
2881 // the number of registers, but must be an ubound on the number of SSE
2882 // registers used and is in the range 0 - 8 inclusive.
2884 // Count the number of XMM registers allocated.
2885 static const MCPhysReg XMMArgRegs[] = {
2886 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
2887 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
2889 unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs, 8);
2890 assert((Subtarget->hasSSE1() || !NumXMMRegs)
2891 && "SSE registers cannot be used when SSE is disabled");
2892 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::MOV8ri),
2893 X86::AL).addImm(NumXMMRegs);
2896 // Materialize callee address in a register. FIXME: GV address can be
2897 // handled with a CALLpcrel32 instead.
2898 X86AddressMode CalleeAM;
2899 if (!X86SelectCallAddress(Callee, CalleeAM))
2902 unsigned CalleeOp = 0;
2903 const GlobalValue *GV = nullptr;
2904 if (CalleeAM.GV != nullptr) {
2906 } else if (CalleeAM.Base.Reg != 0) {
2907 CalleeOp = CalleeAM.Base.Reg;
2912 MachineInstrBuilder MIB;
2914 // Register-indirect call.
2915 unsigned CallOpc = Is64Bit ? X86::CALL64r : X86::CALL32r;
2916 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CallOpc))
2920 assert(GV && "Not a direct call");
2921 unsigned CallOpc = Is64Bit ? X86::CALL64pcrel32 : X86::CALLpcrel32;
2923 // See if we need any target-specific flags on the GV operand.
2924 unsigned char OpFlags = 0;
2926 // On ELF targets, in both X86-64 and X86-32 mode, direct calls to
2927 // external symbols most go through the PLT in PIC mode. If the symbol
2928 // has hidden or protected visibility, or if it is static or local, then
2929 // we don't need to use the PLT - we can directly call it.
2930 if (Subtarget->isTargetELF() &&
2931 TM.getRelocationModel() == Reloc::PIC_ &&
2932 GV->hasDefaultVisibility() && !GV->hasLocalLinkage()) {
2933 OpFlags = X86II::MO_PLT;
2934 } else if (Subtarget->isPICStyleStubAny() &&
2935 (GV->isDeclaration() || GV->isWeakForLinker()) &&
2936 (!Subtarget->getTargetTriple().isMacOSX() ||
2937 Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
2938 // PC-relative references to external symbols should go through $stub,
2939 // unless we're building with the leopard linker or later, which
2940 // automatically synthesizes these stubs.
2941 OpFlags = X86II::MO_DARWIN_STUB;
2944 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CallOpc));
2946 MIB.addExternalSymbol(SymName, OpFlags);
2948 MIB.addGlobalAddress(GV, 0, OpFlags);
2951 // Add a register mask operand representing the call-preserved registers.
2952 // Proper defs for return values will be added by setPhysRegsDeadExcept().
2953 MIB.addRegMask(TRI.getCallPreservedMask(CC));
2955 // Add an implicit use GOT pointer in EBX.
2956 if (Subtarget->isPICStyleGOT())
2957 MIB.addReg(X86::EBX, RegState::Implicit);
2959 if (Is64Bit && IsVarArg && !IsWin64)
2960 MIB.addReg(X86::AL, RegState::Implicit);
2962 // Add implicit physical register uses to the call.
2963 for (auto Reg : OutRegs)
2964 MIB.addReg(Reg, RegState::Implicit);
2966 // Issue CALLSEQ_END
2967 unsigned NumBytesForCalleeToPop =
2968 computeBytesPoppedByCallee(Subtarget, CC, CLI.CS);
2969 unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
2970 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackUp))
2971 .addImm(NumBytes).addImm(NumBytesForCalleeToPop);
2973 // Now handle call return values.
2974 SmallVector<CCValAssign, 16> RVLocs;
2975 CCState CCRetInfo(CC, IsVarArg, *FuncInfo.MF, TM, RVLocs,
2976 CLI.RetTy->getContext());
2977 CCRetInfo.AnalyzeCallResult(Ins, RetCC_X86);
2979 // Copy all of the result registers out of their specified physreg.
2980 unsigned ResultReg = FuncInfo.CreateRegs(CLI.RetTy);
2981 for (unsigned i = 0; i != RVLocs.size(); ++i) {
2982 CCValAssign &VA = RVLocs[i];
2983 EVT CopyVT = VA.getValVT();
2984 unsigned CopyReg = ResultReg + i;
2986 // If this is x86-64, and we disabled SSE, we can't return FP values
2987 if ((CopyVT == MVT::f32 || CopyVT == MVT::f64) &&
2988 ((Is64Bit || Ins[i].Flags.isInReg()) && !Subtarget->hasSSE1())) {
2989 report_fatal_error("SSE register return with SSE disabled");
2992 // If this is a call to a function that returns an fp value on the floating
2993 // point stack, we must guarantee the value is popped from the stack, so
2994 // a COPY is not good enough - the copy instruction may be eliminated if the
2995 // return value is not used. We use the FpPOP_RETVAL instruction instead.
2996 if (VA.getLocReg() == X86::ST0 || VA.getLocReg() == X86::ST1) {
2997 // If we prefer to use the value in xmm registers, copy it out as f80 and
2998 // use a truncate to move it from fp stack reg to xmm reg.
2999 if (isScalarFPTypeInSSEReg(VA.getValVT())) {
3001 CopyReg = createResultReg(&X86::RFP80RegClass);
3003 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3004 TII.get(X86::FpPOP_RETVAL), CopyReg);
3006 // Round the f80 to the right size, which also moves it to the appropriate
3007 // xmm register. This is accomplished by storing the f80 value in memory
3008 // and then loading it back.
3009 if (CopyVT != VA.getValVT()) {
3010 EVT ResVT = VA.getValVT();
3011 unsigned Opc = ResVT == MVT::f32 ? X86::ST_Fp80m32 : X86::ST_Fp80m64;
3012 unsigned MemSize = ResVT.getSizeInBits()/8;
3013 int FI = MFI.CreateStackObject(MemSize, MemSize, false);
3014 addFrameReference(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3017 Opc = ResVT == MVT::f32 ? X86::MOVSSrm : X86::MOVSDrm;
3018 addFrameReference(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3019 TII.get(Opc), ResultReg + i), FI);
3022 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3023 TII.get(TargetOpcode::COPY), CopyReg).addReg(VA.getLocReg());
3024 InRegs.push_back(VA.getLocReg());
3028 CLI.ResultReg = ResultReg;
3029 CLI.NumResultRegs = RVLocs.size();
3036 X86FastISel::TargetSelectInstruction(const Instruction *I) {
3037 switch (I->getOpcode()) {
3039 case Instruction::Load:
3040 return X86SelectLoad(I);
3041 case Instruction::Store:
3042 return X86SelectStore(I);
3043 case Instruction::Ret:
3044 return X86SelectRet(I);
3045 case Instruction::ICmp:
3046 case Instruction::FCmp:
3047 return X86SelectCmp(I);
3048 case Instruction::ZExt:
3049 return X86SelectZExt(I);
3050 case Instruction::Br:
3051 return X86SelectBranch(I);
3052 case Instruction::LShr:
3053 case Instruction::AShr:
3054 case Instruction::Shl:
3055 return X86SelectShift(I);
3056 case Instruction::SDiv:
3057 case Instruction::UDiv:
3058 case Instruction::SRem:
3059 case Instruction::URem:
3060 return X86SelectDivRem(I);
3061 case Instruction::Select:
3062 return X86SelectSelect(I);
3063 case Instruction::Trunc:
3064 return X86SelectTrunc(I);
3065 case Instruction::FPExt:
3066 return X86SelectFPExt(I);
3067 case Instruction::FPTrunc:
3068 return X86SelectFPTrunc(I);
3069 case Instruction::IntToPtr: // Deliberate fall-through.
3070 case Instruction::PtrToInt: {
3071 EVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
3072 EVT DstVT = TLI.getValueType(I->getType());
3073 if (DstVT.bitsGT(SrcVT))
3074 return X86SelectZExt(I);
3075 if (DstVT.bitsLT(SrcVT))
3076 return X86SelectTrunc(I);
3077 unsigned Reg = getRegForValue(I->getOperand(0));
3078 if (Reg == 0) return false;
3079 UpdateValueMap(I, Reg);
3087 unsigned X86FastISel::TargetMaterializeConstant(const Constant *C) {
3089 if (!isTypeLegal(C->getType(), VT))
3092 // Can't handle alternate code models yet.
3093 if (TM.getCodeModel() != CodeModel::Small)
3096 // Get opcode and regclass of the output for the given load instruction.
3098 const TargetRegisterClass *RC = nullptr;
3099 switch (VT.SimpleTy) {
3103 RC = &X86::GR8RegClass;
3107 RC = &X86::GR16RegClass;
3111 RC = &X86::GR32RegClass;
3114 // Must be in x86-64 mode.
3116 RC = &X86::GR64RegClass;
3119 if (X86ScalarSSEf32) {
3120 Opc = Subtarget->hasAVX() ? X86::VMOVSSrm : X86::MOVSSrm;
3121 RC = &X86::FR32RegClass;
3123 Opc = X86::LD_Fp32m;
3124 RC = &X86::RFP32RegClass;
3128 if (X86ScalarSSEf64) {
3129 Opc = Subtarget->hasAVX() ? X86::VMOVSDrm : X86::MOVSDrm;
3130 RC = &X86::FR64RegClass;
3132 Opc = X86::LD_Fp64m;
3133 RC = &X86::RFP64RegClass;
3137 // No f80 support yet.
3141 // Materialize addresses with LEA/MOV instructions.
3142 if (isa<GlobalValue>(C)) {
3144 if (X86SelectAddress(C, AM)) {
3145 // If the expression is just a basereg, then we're done, otherwise we need
3147 if (AM.BaseType == X86AddressMode::RegBase &&
3148 AM.IndexReg == 0 && AM.Disp == 0 && AM.GV == nullptr)
3151 unsigned ResultReg = createResultReg(RC);
3152 if (TM.getRelocationModel() == Reloc::Static &&
3153 TLI.getPointerTy() == MVT::i64) {
3154 // The displacement code be more than 32 bits away so we need to use
3155 // an instruction with a 64 bit immediate
3157 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3158 TII.get(Opc), ResultReg).addGlobalAddress(cast<GlobalValue>(C));
3160 Opc = TLI.getPointerTy() == MVT::i32 ? X86::LEA32r : X86::LEA64r;
3161 addFullAddress(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3162 TII.get(Opc), ResultReg), AM);
3169 // MachineConstantPool wants an explicit alignment.
3170 unsigned Align = DL.getPrefTypeAlignment(C->getType());
3172 // Alignment of vector types. FIXME!
3173 Align = DL.getTypeAllocSize(C->getType());
3176 // x86-32 PIC requires a PIC base register for constant pools.
3177 unsigned PICBase = 0;
3178 unsigned char OpFlag = 0;
3179 if (Subtarget->isPICStyleStubPIC()) { // Not dynamic-no-pic
3180 OpFlag = X86II::MO_PIC_BASE_OFFSET;
3181 PICBase = getInstrInfo()->getGlobalBaseReg(FuncInfo.MF);
3182 } else if (Subtarget->isPICStyleGOT()) {
3183 OpFlag = X86II::MO_GOTOFF;
3184 PICBase = getInstrInfo()->getGlobalBaseReg(FuncInfo.MF);
3185 } else if (Subtarget->isPICStyleRIPRel() &&
3186 TM.getCodeModel() == CodeModel::Small) {
3190 // Create the load from the constant pool.
3191 unsigned MCPOffset = MCP.getConstantPoolIndex(C, Align);
3192 unsigned ResultReg = createResultReg(RC);
3193 addConstantPoolReference(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3194 TII.get(Opc), ResultReg),
3195 MCPOffset, PICBase, OpFlag);
3200 unsigned X86FastISel::TargetMaterializeAlloca(const AllocaInst *C) {
3201 // Fail on dynamic allocas. At this point, getRegForValue has already
3202 // checked its CSE maps, so if we're here trying to handle a dynamic
3203 // alloca, we're not going to succeed. X86SelectAddress has a
3204 // check for dynamic allocas, because it's called directly from
3205 // various places, but TargetMaterializeAlloca also needs a check
3206 // in order to avoid recursion between getRegForValue,
3207 // X86SelectAddrss, and TargetMaterializeAlloca.
3208 if (!FuncInfo.StaticAllocaMap.count(C))
3210 assert(C->isStaticAlloca() && "dynamic alloca in the static alloca map?");
3213 if (!X86SelectAddress(C, AM))
3215 unsigned Opc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
3216 const TargetRegisterClass* RC = TLI.getRegClassFor(TLI.getPointerTy());
3217 unsigned ResultReg = createResultReg(RC);
3218 addFullAddress(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3219 TII.get(Opc), ResultReg), AM);
3223 unsigned X86FastISel::TargetMaterializeFloatZero(const ConstantFP *CF) {
3225 if (!isTypeLegal(CF->getType(), VT))
3228 // Get opcode and regclass for the given zero.
3230 const TargetRegisterClass *RC = nullptr;
3231 switch (VT.SimpleTy) {
3234 if (X86ScalarSSEf32) {
3235 Opc = X86::FsFLD0SS;
3236 RC = &X86::FR32RegClass;
3238 Opc = X86::LD_Fp032;
3239 RC = &X86::RFP32RegClass;
3243 if (X86ScalarSSEf64) {
3244 Opc = X86::FsFLD0SD;
3245 RC = &X86::FR64RegClass;
3247 Opc = X86::LD_Fp064;
3248 RC = &X86::RFP64RegClass;
3252 // No f80 support yet.
3256 unsigned ResultReg = createResultReg(RC);
3257 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg);
3262 bool X86FastISel::tryToFoldLoadIntoMI(MachineInstr *MI, unsigned OpNo,
3263 const LoadInst *LI) {
3264 const Value *Ptr = LI->getPointerOperand();
3266 if (!X86SelectAddress(Ptr, AM))
3269 const X86InstrInfo &XII = (const X86InstrInfo&)TII;
3271 unsigned Size = DL.getTypeAllocSize(LI->getType());
3272 unsigned Alignment = LI->getAlignment();
3274 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3275 Alignment = DL.getABITypeAlignment(LI->getType());
3277 SmallVector<MachineOperand, 8> AddrOps;
3278 AM.getFullAddress(AddrOps);
3280 MachineInstr *Result =
3281 XII.foldMemoryOperandImpl(*FuncInfo.MF, MI, OpNo, AddrOps, Size, Alignment);
3285 Result->addMemOperand(*FuncInfo.MF, createMachineMemOperandFor(LI));
3286 FuncInfo.MBB->insert(FuncInfo.InsertPt, Result);
3287 MI->eraseFromParent();
3293 FastISel *X86::createFastISel(FunctionLoweringInfo &funcInfo,
3294 const TargetLibraryInfo *libInfo) {
3295 return new X86FastISel(funcInfo, libInfo);