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 "X86InstrBuilder.h"
18 #include "X86ISelLowering.h"
19 #include "X86RegisterInfo.h"
20 #include "X86Subtarget.h"
21 #include "X86TargetMachine.h"
22 #include "llvm/CallingConv.h"
23 #include "llvm/DerivedTypes.h"
24 #include "llvm/GlobalVariable.h"
25 #include "llvm/Instructions.h"
26 #include "llvm/Intrinsics.h"
27 #include "llvm/CodeGen/FastISel.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/Support/CallSite.h"
32 #include "llvm/Support/GetElementPtrTypeIterator.h"
37 class X86FastISel : public FastISel {
38 /// Subtarget - Keep a pointer to the X86Subtarget around so that we can
39 /// make the right decision when generating code for different targets.
40 const X86Subtarget *Subtarget;
42 /// StackPtr - Register used as the stack pointer.
46 /// X86ScalarSSEf32, X86ScalarSSEf64 - Select between SSE or x87
47 /// floating point ops.
48 /// When SSE is available, use it for f32 operations.
49 /// When SSE2 is available, use it for f64 operations.
54 explicit X86FastISel(MachineFunction &mf,
55 MachineModuleInfo *mmi,
57 DenseMap<const Value *, unsigned> &vm,
58 DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
59 DenseMap<const AllocaInst *, int> &am
61 , SmallSet<Instruction*, 8> &cil
64 : FastISel(mf, mmi, dw, vm, bm, am
69 Subtarget = &TM.getSubtarget<X86Subtarget>();
70 StackPtr = Subtarget->is64Bit() ? X86::RSP : X86::ESP;
71 X86ScalarSSEf64 = Subtarget->hasSSE2();
72 X86ScalarSSEf32 = Subtarget->hasSSE1();
75 virtual bool TargetSelectInstruction(Instruction *I);
77 #include "X86GenFastISel.inc"
80 bool X86FastEmitCompare(Value *LHS, Value *RHS, MVT VT);
82 bool X86FastEmitLoad(MVT VT, const X86AddressMode &AM, unsigned &RR);
84 bool X86FastEmitStore(MVT VT, Value *Val,
85 const X86AddressMode &AM);
86 bool X86FastEmitStore(MVT VT, unsigned Val,
87 const X86AddressMode &AM);
89 bool X86FastEmitExtend(ISD::NodeType Opc, MVT DstVT, unsigned Src, MVT SrcVT,
92 bool X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall);
94 bool X86SelectLoad(Instruction *I);
96 bool X86SelectStore(Instruction *I);
98 bool X86SelectCmp(Instruction *I);
100 bool X86SelectZExt(Instruction *I);
102 bool X86SelectBranch(Instruction *I);
104 bool X86SelectShift(Instruction *I);
106 bool X86SelectSelect(Instruction *I);
108 bool X86SelectTrunc(Instruction *I);
110 bool X86SelectFPExt(Instruction *I);
111 bool X86SelectFPTrunc(Instruction *I);
113 bool X86SelectExtractValue(Instruction *I);
115 bool X86VisitIntrinsicCall(CallInst &I, unsigned Intrinsic);
116 bool X86SelectCall(Instruction *I);
118 CCAssignFn *CCAssignFnForCall(unsigned CC, bool isTailCall = false);
120 const X86InstrInfo *getInstrInfo() const {
121 return getTargetMachine()->getInstrInfo();
123 const X86TargetMachine *getTargetMachine() const {
124 return static_cast<const X86TargetMachine *>(&TM);
127 unsigned TargetMaterializeConstant(Constant *C);
129 unsigned TargetMaterializeAlloca(AllocaInst *C);
131 /// isScalarFPTypeInSSEReg - Return true if the specified scalar FP type is
132 /// computed in an SSE register, not on the X87 floating point stack.
133 bool isScalarFPTypeInSSEReg(MVT VT) const {
134 return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
135 (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
138 bool isTypeLegal(const Type *Ty, MVT &VT, bool AllowI1 = false);
141 } // end anonymous namespace.
143 bool X86FastISel::isTypeLegal(const Type *Ty, MVT &VT, bool AllowI1) {
144 VT = TLI.getValueType(Ty, /*HandleUnknown=*/true);
145 if (VT == MVT::Other || !VT.isSimple())
146 // Unhandled type. Halt "fast" selection and bail.
149 // For now, require SSE/SSE2 for performing floating-point operations,
150 // since x87 requires additional work.
151 if (VT == MVT::f64 && !X86ScalarSSEf64)
153 if (VT == MVT::f32 && !X86ScalarSSEf32)
155 // Similarly, no f80 support yet.
158 // We only handle legal types. For example, on x86-32 the instruction
159 // selector contains all of the 64-bit instructions from x86-64,
160 // under the assumption that i64 won't be used if the target doesn't
162 return (AllowI1 && VT == MVT::i1) || TLI.isTypeLegal(VT);
165 #include "X86GenCallingConv.inc"
167 /// CCAssignFnForCall - Selects the correct CCAssignFn for a given calling
169 CCAssignFn *X86FastISel::CCAssignFnForCall(unsigned CC, bool isTaillCall) {
170 if (Subtarget->is64Bit()) {
171 if (Subtarget->isTargetWin64())
172 return CC_X86_Win64_C;
173 else if (CC == CallingConv::Fast && isTaillCall)
174 return CC_X86_64_TailCall;
179 if (CC == CallingConv::X86_FastCall)
180 return CC_X86_32_FastCall;
181 else if (CC == CallingConv::Fast)
182 return CC_X86_32_FastCC;
187 /// X86FastEmitLoad - Emit a machine instruction to load a value of type VT.
188 /// The address is either pre-computed, i.e. Ptr, or a GlobalAddress, i.e. GV.
189 /// Return true and the result register by reference if it is possible.
190 bool X86FastISel::X86FastEmitLoad(MVT VT, const X86AddressMode &AM,
191 unsigned &ResultReg) {
192 // Get opcode and regclass of the output for the given load instruction.
194 const TargetRegisterClass *RC = NULL;
195 switch (VT.getSimpleVT()) {
196 default: return false;
199 RC = X86::GR8RegisterClass;
203 RC = X86::GR16RegisterClass;
207 RC = X86::GR32RegisterClass;
210 // Must be in x86-64 mode.
212 RC = X86::GR64RegisterClass;
215 if (Subtarget->hasSSE1()) {
217 RC = X86::FR32RegisterClass;
220 RC = X86::RFP32RegisterClass;
224 if (Subtarget->hasSSE2()) {
226 RC = X86::FR64RegisterClass;
229 RC = X86::RFP64RegisterClass;
233 // No f80 support yet.
237 ResultReg = createResultReg(RC);
238 addFullAddress(BuildMI(MBB, DL, TII.get(Opc), ResultReg), AM);
242 /// X86FastEmitStore - Emit a machine instruction to store a value Val of
243 /// type VT. The address is either pre-computed, consisted of a base ptr, Ptr
244 /// and a displacement offset, or a GlobalAddress,
245 /// i.e. V. Return true if it is possible.
247 X86FastISel::X86FastEmitStore(MVT VT, unsigned Val,
248 const X86AddressMode &AM) {
249 // Get opcode and regclass of the output for the given store instruction.
251 switch (VT.getSimpleVT()) {
252 case MVT::f80: // No f80 support yet.
253 default: return false;
254 case MVT::i8: Opc = X86::MOV8mr; break;
255 case MVT::i16: Opc = X86::MOV16mr; break;
256 case MVT::i32: Opc = X86::MOV32mr; break;
257 case MVT::i64: Opc = X86::MOV64mr; break; // Must be in x86-64 mode.
259 Opc = Subtarget->hasSSE1() ? X86::MOVSSmr : X86::ST_Fp32m;
262 Opc = Subtarget->hasSSE2() ? X86::MOVSDmr : X86::ST_Fp64m;
266 addFullAddress(BuildMI(MBB, DL, TII.get(Opc)), AM).addReg(Val);
270 bool X86FastISel::X86FastEmitStore(MVT VT, Value *Val,
271 const X86AddressMode &AM) {
272 // Handle 'null' like i32/i64 0.
273 if (isa<ConstantPointerNull>(Val))
274 Val = Constant::getNullValue(TD.getIntPtrType());
276 // If this is a store of a simple constant, fold the constant into the store.
277 if (ConstantInt *CI = dyn_cast<ConstantInt>(Val)) {
279 switch (VT.getSimpleVT()) {
281 case MVT::i8: Opc = X86::MOV8mi; break;
282 case MVT::i16: Opc = X86::MOV16mi; break;
283 case MVT::i32: Opc = X86::MOV32mi; break;
285 // Must be a 32-bit sign extended value.
286 if ((int)CI->getSExtValue() == CI->getSExtValue())
287 Opc = X86::MOV64mi32;
292 addFullAddress(BuildMI(MBB, DL, TII.get(Opc)), AM)
293 .addImm(CI->getSExtValue());
298 unsigned ValReg = getRegForValue(Val);
302 return X86FastEmitStore(VT, ValReg, AM);
305 /// X86FastEmitExtend - Emit a machine instruction to extend a value Src of
306 /// type SrcVT to type DstVT using the specified extension opcode Opc (e.g.
307 /// ISD::SIGN_EXTEND).
308 bool X86FastISel::X86FastEmitExtend(ISD::NodeType Opc, MVT DstVT,
309 unsigned Src, MVT SrcVT,
310 unsigned &ResultReg) {
311 unsigned RR = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(), Opc, Src);
320 /// X86SelectAddress - Attempt to fill in an address from the given value.
322 bool X86FastISel::X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall) {
324 unsigned Opcode = Instruction::UserOp1;
325 if (Instruction *I = dyn_cast<Instruction>(V)) {
326 Opcode = I->getOpcode();
328 } else if (ConstantExpr *C = dyn_cast<ConstantExpr>(V)) {
329 Opcode = C->getOpcode();
335 case Instruction::BitCast:
336 // Look past bitcasts.
337 return X86SelectAddress(U->getOperand(0), AM, isCall);
339 case Instruction::IntToPtr:
340 // Look past no-op inttoptrs.
341 if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
342 return X86SelectAddress(U->getOperand(0), AM, isCall);
345 case Instruction::PtrToInt:
346 // Look past no-op ptrtoints.
347 if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
348 return X86SelectAddress(U->getOperand(0), AM, isCall);
351 case Instruction::Alloca: {
353 // Do static allocas.
354 const AllocaInst *A = cast<AllocaInst>(V);
355 DenseMap<const AllocaInst*, int>::iterator SI = StaticAllocaMap.find(A);
356 if (SI != StaticAllocaMap.end()) {
357 AM.BaseType = X86AddressMode::FrameIndexBase;
358 AM.Base.FrameIndex = SI->second;
364 case Instruction::Add: {
366 // Adds of constants are common and easy enough.
367 if (ConstantInt *CI = dyn_cast<ConstantInt>(U->getOperand(1))) {
368 uint64_t Disp = (int32_t)AM.Disp + (uint64_t)CI->getSExtValue();
369 // They have to fit in the 32-bit signed displacement field though.
371 AM.Disp = (uint32_t)Disp;
372 return X86SelectAddress(U->getOperand(0), AM, isCall);
378 case Instruction::GetElementPtr: {
380 // Pattern-match simple GEPs.
381 uint64_t Disp = (int32_t)AM.Disp;
382 unsigned IndexReg = AM.IndexReg;
383 unsigned Scale = AM.Scale;
384 gep_type_iterator GTI = gep_type_begin(U);
385 // Iterate through the indices, folding what we can. Constants can be
386 // folded, and one dynamic index can be handled, if the scale is supported.
387 for (User::op_iterator i = U->op_begin() + 1, e = U->op_end();
388 i != e; ++i, ++GTI) {
390 if (const StructType *STy = dyn_cast<StructType>(*GTI)) {
391 const StructLayout *SL = TD.getStructLayout(STy);
392 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
393 Disp += SL->getElementOffset(Idx);
395 uint64_t S = TD.getTypePaddedSize(GTI.getIndexedType());
396 if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
397 // Constant-offset addressing.
398 Disp += CI->getSExtValue() * S;
399 } else if (IndexReg == 0 &&
401 !getTargetMachine()->symbolicAddressesAreRIPRel()) &&
402 (S == 1 || S == 2 || S == 4 || S == 8)) {
403 // Scaled-index addressing.
405 IndexReg = getRegForGEPIndex(Op);
410 goto unsupported_gep;
413 // Check for displacement overflow.
416 // Ok, the GEP indices were covered by constant-offset and scaled-index
417 // addressing. Update the address state and move on to examining the base.
418 AM.IndexReg = IndexReg;
420 AM.Disp = (uint32_t)Disp;
421 return X86SelectAddress(U->getOperand(0), AM, isCall);
423 // Ok, the GEP indices weren't all covered.
428 // Handle constant address.
429 if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
430 // Can't handle alternate code models yet.
431 if (TM.getCodeModel() != CodeModel::Default &&
432 TM.getCodeModel() != CodeModel::Small)
435 // RIP-relative addresses can't have additional register operands.
436 if (getTargetMachine()->symbolicAddressesAreRIPRel() &&
437 (AM.Base.Reg != 0 || AM.IndexReg != 0))
440 // Can't handle TLS yet.
441 if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
442 if (GVar->isThreadLocal())
445 // Set up the basic address.
448 TM.getRelocationModel() == Reloc::PIC_ &&
449 !Subtarget->is64Bit())
450 AM.Base.Reg = getInstrInfo()->getGlobalBaseReg(&MF);
452 // Emit an extra load if the ABI requires it.
453 if (Subtarget->GVRequiresExtraLoad(GV, TM, isCall)) {
454 // Check to see if we've already materialized this
455 // value in a register in this block.
456 if (unsigned Reg = LocalValueMap[V]) {
461 // Issue load from stub if necessary.
463 const TargetRegisterClass *RC = NULL;
464 if (TLI.getPointerTy() == MVT::i32) {
466 RC = X86::GR32RegisterClass;
469 RC = X86::GR64RegisterClass;
472 X86AddressMode StubAM;
473 StubAM.Base.Reg = AM.Base.Reg;
475 unsigned ResultReg = createResultReg(RC);
476 addFullAddress(BuildMI(MBB, DL, TII.get(Opc), ResultReg), StubAM);
478 // Now construct the final address. Note that the Disp, Scale,
479 // and Index values may already be set here.
480 AM.Base.Reg = ResultReg;
483 // Prevent loading GV stub multiple times in same MBB.
484 LocalValueMap[V] = AM.Base.Reg;
489 // If all else fails, try to materialize the value in a register.
490 if (!AM.GV || !getTargetMachine()->symbolicAddressesAreRIPRel()) {
491 if (AM.Base.Reg == 0) {
492 AM.Base.Reg = getRegForValue(V);
493 return AM.Base.Reg != 0;
495 if (AM.IndexReg == 0) {
496 assert(AM.Scale == 1 && "Scale with no index!");
497 AM.IndexReg = getRegForValue(V);
498 return AM.IndexReg != 0;
505 /// X86SelectStore - Select and emit code to implement store instructions.
506 bool X86FastISel::X86SelectStore(Instruction* I) {
508 if (!isTypeLegal(I->getOperand(0)->getType(), VT))
512 if (!X86SelectAddress(I->getOperand(1), AM, false))
515 return X86FastEmitStore(VT, I->getOperand(0), AM);
518 /// X86SelectLoad - Select and emit code to implement load instructions.
520 bool X86FastISel::X86SelectLoad(Instruction *I) {
522 if (!isTypeLegal(I->getType(), VT))
526 if (!X86SelectAddress(I->getOperand(0), AM, false))
529 unsigned ResultReg = 0;
530 if (X86FastEmitLoad(VT, AM, ResultReg)) {
531 UpdateValueMap(I, ResultReg);
537 static unsigned X86ChooseCmpOpcode(MVT VT) {
538 switch (VT.getSimpleVT()) {
540 case MVT::i8: return X86::CMP8rr;
541 case MVT::i16: return X86::CMP16rr;
542 case MVT::i32: return X86::CMP32rr;
543 case MVT::i64: return X86::CMP64rr;
544 case MVT::f32: return X86::UCOMISSrr;
545 case MVT::f64: return X86::UCOMISDrr;
549 /// X86ChooseCmpImmediateOpcode - If we have a comparison with RHS as the RHS
550 /// of the comparison, return an opcode that works for the compare (e.g.
551 /// CMP32ri) otherwise return 0.
552 static unsigned X86ChooseCmpImmediateOpcode(MVT VT, ConstantInt *RHSC) {
553 switch (VT.getSimpleVT()) {
554 // Otherwise, we can't fold the immediate into this comparison.
556 case MVT::i8: return X86::CMP8ri;
557 case MVT::i16: return X86::CMP16ri;
558 case MVT::i32: return X86::CMP32ri;
560 // 64-bit comparisons are only valid if the immediate fits in a 32-bit sext
562 if ((int)RHSC->getSExtValue() == RHSC->getSExtValue())
563 return X86::CMP64ri32;
568 bool X86FastISel::X86FastEmitCompare(Value *Op0, Value *Op1, MVT VT) {
569 unsigned Op0Reg = getRegForValue(Op0);
570 if (Op0Reg == 0) return false;
572 // Handle 'null' like i32/i64 0.
573 if (isa<ConstantPointerNull>(Op1))
574 Op1 = Constant::getNullValue(TD.getIntPtrType());
576 // We have two options: compare with register or immediate. If the RHS of
577 // the compare is an immediate that we can fold into this compare, use
578 // CMPri, otherwise use CMPrr.
579 if (ConstantInt *Op1C = dyn_cast<ConstantInt>(Op1)) {
580 if (unsigned CompareImmOpc = X86ChooseCmpImmediateOpcode(VT, Op1C)) {
581 BuildMI(MBB, DL, TII.get(CompareImmOpc)).addReg(Op0Reg)
582 .addImm(Op1C->getSExtValue());
587 unsigned CompareOpc = X86ChooseCmpOpcode(VT);
588 if (CompareOpc == 0) return false;
590 unsigned Op1Reg = getRegForValue(Op1);
591 if (Op1Reg == 0) return false;
592 BuildMI(MBB, DL, TII.get(CompareOpc)).addReg(Op0Reg).addReg(Op1Reg);
597 bool X86FastISel::X86SelectCmp(Instruction *I) {
598 CmpInst *CI = cast<CmpInst>(I);
601 if (!isTypeLegal(I->getOperand(0)->getType(), VT))
604 unsigned ResultReg = createResultReg(&X86::GR8RegClass);
606 bool SwapArgs; // false -> compare Op0, Op1. true -> compare Op1, Op0.
607 switch (CI->getPredicate()) {
608 case CmpInst::FCMP_OEQ: {
609 if (!X86FastEmitCompare(CI->getOperand(0), CI->getOperand(1), VT))
612 unsigned EReg = createResultReg(&X86::GR8RegClass);
613 unsigned NPReg = createResultReg(&X86::GR8RegClass);
614 BuildMI(MBB, DL, TII.get(X86::SETEr), EReg);
615 BuildMI(MBB, DL, TII.get(X86::SETNPr), NPReg);
617 TII.get(X86::AND8rr), ResultReg).addReg(NPReg).addReg(EReg);
618 UpdateValueMap(I, ResultReg);
621 case CmpInst::FCMP_UNE: {
622 if (!X86FastEmitCompare(CI->getOperand(0), CI->getOperand(1), VT))
625 unsigned NEReg = createResultReg(&X86::GR8RegClass);
626 unsigned PReg = createResultReg(&X86::GR8RegClass);
627 BuildMI(MBB, DL, TII.get(X86::SETNEr), NEReg);
628 BuildMI(MBB, DL, TII.get(X86::SETPr), PReg);
629 BuildMI(MBB, DL, TII.get(X86::OR8rr), ResultReg).addReg(PReg).addReg(NEReg);
630 UpdateValueMap(I, ResultReg);
633 case CmpInst::FCMP_OGT: SwapArgs = false; SetCCOpc = X86::SETAr; break;
634 case CmpInst::FCMP_OGE: SwapArgs = false; SetCCOpc = X86::SETAEr; break;
635 case CmpInst::FCMP_OLT: SwapArgs = true; SetCCOpc = X86::SETAr; break;
636 case CmpInst::FCMP_OLE: SwapArgs = true; SetCCOpc = X86::SETAEr; break;
637 case CmpInst::FCMP_ONE: SwapArgs = false; SetCCOpc = X86::SETNEr; break;
638 case CmpInst::FCMP_ORD: SwapArgs = false; SetCCOpc = X86::SETNPr; break;
639 case CmpInst::FCMP_UNO: SwapArgs = false; SetCCOpc = X86::SETPr; break;
640 case CmpInst::FCMP_UEQ: SwapArgs = false; SetCCOpc = X86::SETEr; break;
641 case CmpInst::FCMP_UGT: SwapArgs = true; SetCCOpc = X86::SETBr; break;
642 case CmpInst::FCMP_UGE: SwapArgs = true; SetCCOpc = X86::SETBEr; break;
643 case CmpInst::FCMP_ULT: SwapArgs = false; SetCCOpc = X86::SETBr; break;
644 case CmpInst::FCMP_ULE: SwapArgs = false; SetCCOpc = X86::SETBEr; break;
646 case CmpInst::ICMP_EQ: SwapArgs = false; SetCCOpc = X86::SETEr; break;
647 case CmpInst::ICMP_NE: SwapArgs = false; SetCCOpc = X86::SETNEr; break;
648 case CmpInst::ICMP_UGT: SwapArgs = false; SetCCOpc = X86::SETAr; break;
649 case CmpInst::ICMP_UGE: SwapArgs = false; SetCCOpc = X86::SETAEr; break;
650 case CmpInst::ICMP_ULT: SwapArgs = false; SetCCOpc = X86::SETBr; break;
651 case CmpInst::ICMP_ULE: SwapArgs = false; SetCCOpc = X86::SETBEr; break;
652 case CmpInst::ICMP_SGT: SwapArgs = false; SetCCOpc = X86::SETGr; break;
653 case CmpInst::ICMP_SGE: SwapArgs = false; SetCCOpc = X86::SETGEr; break;
654 case CmpInst::ICMP_SLT: SwapArgs = false; SetCCOpc = X86::SETLr; break;
655 case CmpInst::ICMP_SLE: SwapArgs = false; SetCCOpc = X86::SETLEr; break;
660 Value *Op0 = CI->getOperand(0), *Op1 = CI->getOperand(1);
664 // Emit a compare of Op0/Op1.
665 if (!X86FastEmitCompare(Op0, Op1, VT))
668 BuildMI(MBB, DL, TII.get(SetCCOpc), ResultReg);
669 UpdateValueMap(I, ResultReg);
673 bool X86FastISel::X86SelectZExt(Instruction *I) {
674 // Special-case hack: The only i1 values we know how to produce currently
675 // set the upper bits of an i8 value to zero.
676 if (I->getType() == Type::Int8Ty &&
677 I->getOperand(0)->getType() == Type::Int1Ty) {
678 unsigned ResultReg = getRegForValue(I->getOperand(0));
679 if (ResultReg == 0) return false;
680 UpdateValueMap(I, ResultReg);
688 bool X86FastISel::X86SelectBranch(Instruction *I) {
689 // Unconditional branches are selected by tablegen-generated code.
690 // Handle a conditional branch.
691 BranchInst *BI = cast<BranchInst>(I);
692 MachineBasicBlock *TrueMBB = MBBMap[BI->getSuccessor(0)];
693 MachineBasicBlock *FalseMBB = MBBMap[BI->getSuccessor(1)];
695 // Fold the common case of a conditional branch with a comparison.
696 if (CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
697 if (CI->hasOneUse()) {
698 MVT VT = TLI.getValueType(CI->getOperand(0)->getType());
700 // Try to take advantage of fallthrough opportunities.
701 CmpInst::Predicate Predicate = CI->getPredicate();
702 if (MBB->isLayoutSuccessor(TrueMBB)) {
703 std::swap(TrueMBB, FalseMBB);
704 Predicate = CmpInst::getInversePredicate(Predicate);
707 bool SwapArgs; // false -> compare Op0, Op1. true -> compare Op1, Op0.
708 unsigned BranchOpc; // Opcode to jump on, e.g. "X86::JA"
711 case CmpInst::FCMP_OEQ:
712 std::swap(TrueMBB, FalseMBB);
713 Predicate = CmpInst::FCMP_UNE;
715 case CmpInst::FCMP_UNE: SwapArgs = false; BranchOpc = X86::JNE; break;
716 case CmpInst::FCMP_OGT: SwapArgs = false; BranchOpc = X86::JA; break;
717 case CmpInst::FCMP_OGE: SwapArgs = false; BranchOpc = X86::JAE; break;
718 case CmpInst::FCMP_OLT: SwapArgs = true; BranchOpc = X86::JA; break;
719 case CmpInst::FCMP_OLE: SwapArgs = true; BranchOpc = X86::JAE; break;
720 case CmpInst::FCMP_ONE: SwapArgs = false; BranchOpc = X86::JNE; break;
721 case CmpInst::FCMP_ORD: SwapArgs = false; BranchOpc = X86::JNP; break;
722 case CmpInst::FCMP_UNO: SwapArgs = false; BranchOpc = X86::JP; break;
723 case CmpInst::FCMP_UEQ: SwapArgs = false; BranchOpc = X86::JE; break;
724 case CmpInst::FCMP_UGT: SwapArgs = true; BranchOpc = X86::JB; break;
725 case CmpInst::FCMP_UGE: SwapArgs = true; BranchOpc = X86::JBE; break;
726 case CmpInst::FCMP_ULT: SwapArgs = false; BranchOpc = X86::JB; break;
727 case CmpInst::FCMP_ULE: SwapArgs = false; BranchOpc = X86::JBE; break;
729 case CmpInst::ICMP_EQ: SwapArgs = false; BranchOpc = X86::JE; break;
730 case CmpInst::ICMP_NE: SwapArgs = false; BranchOpc = X86::JNE; break;
731 case CmpInst::ICMP_UGT: SwapArgs = false; BranchOpc = X86::JA; break;
732 case CmpInst::ICMP_UGE: SwapArgs = false; BranchOpc = X86::JAE; break;
733 case CmpInst::ICMP_ULT: SwapArgs = false; BranchOpc = X86::JB; break;
734 case CmpInst::ICMP_ULE: SwapArgs = false; BranchOpc = X86::JBE; break;
735 case CmpInst::ICMP_SGT: SwapArgs = false; BranchOpc = X86::JG; break;
736 case CmpInst::ICMP_SGE: SwapArgs = false; BranchOpc = X86::JGE; break;
737 case CmpInst::ICMP_SLT: SwapArgs = false; BranchOpc = X86::JL; break;
738 case CmpInst::ICMP_SLE: SwapArgs = false; BranchOpc = X86::JLE; break;
743 Value *Op0 = CI->getOperand(0), *Op1 = CI->getOperand(1);
747 // Emit a compare of the LHS and RHS, setting the flags.
748 if (!X86FastEmitCompare(Op0, Op1, VT))
751 BuildMI(MBB, DL, TII.get(BranchOpc)).addMBB(TrueMBB);
753 if (Predicate == CmpInst::FCMP_UNE) {
754 // X86 requires a second branch to handle UNE (and OEQ,
755 // which is mapped to UNE above).
756 BuildMI(MBB, DL, TII.get(X86::JP)).addMBB(TrueMBB);
759 FastEmitBranch(FalseMBB);
760 MBB->addSuccessor(TrueMBB);
763 } else if (ExtractValueInst *EI =
764 dyn_cast<ExtractValueInst>(BI->getCondition())) {
765 // Check to see if the branch instruction is from an "arithmetic with
766 // overflow" intrinsic. The main way these intrinsics are used is:
768 // %t = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %v1, i32 %v2)
769 // %sum = extractvalue { i32, i1 } %t, 0
770 // %obit = extractvalue { i32, i1 } %t, 1
771 // br i1 %obit, label %overflow, label %normal
773 // The %sum and %obit are converted in an ADD and a SETO/SETB before
774 // reaching the branch. Therefore, we search backwards through the MBB
775 // looking for the SETO/SETB instruction. If an instruction modifies the
776 // EFLAGS register before we reach the SETO/SETB instruction, then we can't
777 // convert the branch into a JO/JB instruction.
779 Value *Agg = EI->getAggregateOperand();
781 if (CallInst *CI = dyn_cast<CallInst>(Agg)) {
782 Function *F = CI->getCalledFunction();
784 if (F && F->isDeclaration()) {
785 switch (F->getIntrinsicID()) {
787 case Intrinsic::sadd_with_overflow:
788 case Intrinsic::uadd_with_overflow: {
789 const MachineInstr *SetMI = 0;
790 unsigned Reg = lookUpRegForValue(EI);
792 for (MachineBasicBlock::const_reverse_iterator
793 RI = MBB->rbegin(), RE = MBB->rend(); RI != RE; ++RI) {
794 const MachineInstr &MI = *RI;
796 if (MI.modifiesRegister(Reg)) {
797 unsigned Src, Dst, SrcSR, DstSR;
799 if (getInstrInfo()->isMoveInstr(MI, Src, Dst, SrcSR, DstSR)) {
808 const TargetInstrDesc &TID = MI.getDesc();
809 const unsigned *ImpDefs = TID.getImplicitDefs();
811 if (TID.hasUnmodeledSideEffects()) break;
813 bool ModifiesEFlags = false;
816 for (unsigned u = 0; ImpDefs[u]; ++u)
817 if (ImpDefs[u] == X86::EFLAGS) {
818 ModifiesEFlags = true;
823 if (ModifiesEFlags) break;
827 unsigned OpCode = SetMI->getOpcode();
829 if (OpCode == X86::SETOr || OpCode == X86::SETBr) {
830 BuildMI(MBB, DL, TII.get((OpCode == X86::SETOr) ?
831 X86::JO : X86::JB)).addMBB(TrueMBB);
832 FastEmitBranch(FalseMBB);
833 MBB->addSuccessor(TrueMBB);
843 // Otherwise do a clumsy setcc and re-test it.
844 unsigned OpReg = getRegForValue(BI->getCondition());
845 if (OpReg == 0) return false;
847 BuildMI(MBB, DL, TII.get(X86::TEST8rr)).addReg(OpReg).addReg(OpReg);
848 BuildMI(MBB, DL, TII.get(X86::JNE)).addMBB(TrueMBB);
849 FastEmitBranch(FalseMBB);
850 MBB->addSuccessor(TrueMBB);
854 bool X86FastISel::X86SelectShift(Instruction *I) {
855 unsigned CReg = 0, OpReg = 0, OpImm = 0;
856 const TargetRegisterClass *RC = NULL;
857 if (I->getType() == Type::Int8Ty) {
859 RC = &X86::GR8RegClass;
860 switch (I->getOpcode()) {
861 case Instruction::LShr: OpReg = X86::SHR8rCL; OpImm = X86::SHR8ri; break;
862 case Instruction::AShr: OpReg = X86::SAR8rCL; OpImm = X86::SAR8ri; break;
863 case Instruction::Shl: OpReg = X86::SHL8rCL; OpImm = X86::SHL8ri; break;
864 default: return false;
866 } else if (I->getType() == Type::Int16Ty) {
868 RC = &X86::GR16RegClass;
869 switch (I->getOpcode()) {
870 case Instruction::LShr: OpReg = X86::SHR16rCL; OpImm = X86::SHR16ri; break;
871 case Instruction::AShr: OpReg = X86::SAR16rCL; OpImm = X86::SAR16ri; break;
872 case Instruction::Shl: OpReg = X86::SHL16rCL; OpImm = X86::SHL16ri; break;
873 default: return false;
875 } else if (I->getType() == Type::Int32Ty) {
877 RC = &X86::GR32RegClass;
878 switch (I->getOpcode()) {
879 case Instruction::LShr: OpReg = X86::SHR32rCL; OpImm = X86::SHR32ri; break;
880 case Instruction::AShr: OpReg = X86::SAR32rCL; OpImm = X86::SAR32ri; break;
881 case Instruction::Shl: OpReg = X86::SHL32rCL; OpImm = X86::SHL32ri; break;
882 default: return false;
884 } else if (I->getType() == Type::Int64Ty) {
886 RC = &X86::GR64RegClass;
887 switch (I->getOpcode()) {
888 case Instruction::LShr: OpReg = X86::SHR64rCL; OpImm = X86::SHR64ri; break;
889 case Instruction::AShr: OpReg = X86::SAR64rCL; OpImm = X86::SAR64ri; break;
890 case Instruction::Shl: OpReg = X86::SHL64rCL; OpImm = X86::SHL64ri; break;
891 default: return false;
897 MVT VT = TLI.getValueType(I->getType(), /*HandleUnknown=*/true);
898 if (VT == MVT::Other || !isTypeLegal(I->getType(), VT))
901 unsigned Op0Reg = getRegForValue(I->getOperand(0));
902 if (Op0Reg == 0) return false;
904 // Fold immediate in shl(x,3).
905 if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
906 unsigned ResultReg = createResultReg(RC);
907 BuildMI(MBB, DL, TII.get(OpImm),
908 ResultReg).addReg(Op0Reg).addImm(CI->getZExtValue() & 0xff);
909 UpdateValueMap(I, ResultReg);
913 unsigned Op1Reg = getRegForValue(I->getOperand(1));
914 if (Op1Reg == 0) return false;
915 TII.copyRegToReg(*MBB, MBB->end(), CReg, Op1Reg, RC, RC);
917 // The shift instruction uses X86::CL. If we defined a super-register
918 // of X86::CL, emit an EXTRACT_SUBREG to precisely describe what
921 BuildMI(MBB, DL, TII.get(TargetInstrInfo::EXTRACT_SUBREG), X86::CL)
922 .addReg(CReg).addImm(X86::SUBREG_8BIT);
924 unsigned ResultReg = createResultReg(RC);
925 BuildMI(MBB, DL, TII.get(OpReg), ResultReg).addReg(Op0Reg);
926 UpdateValueMap(I, ResultReg);
930 bool X86FastISel::X86SelectSelect(Instruction *I) {
931 MVT VT = TLI.getValueType(I->getType(), /*HandleUnknown=*/true);
932 if (VT == MVT::Other || !isTypeLegal(I->getType(), VT))
936 const TargetRegisterClass *RC = NULL;
937 if (VT.getSimpleVT() == MVT::i16) {
938 Opc = X86::CMOVE16rr;
939 RC = &X86::GR16RegClass;
940 } else if (VT.getSimpleVT() == MVT::i32) {
941 Opc = X86::CMOVE32rr;
942 RC = &X86::GR32RegClass;
943 } else if (VT.getSimpleVT() == MVT::i64) {
944 Opc = X86::CMOVE64rr;
945 RC = &X86::GR64RegClass;
950 unsigned Op0Reg = getRegForValue(I->getOperand(0));
951 if (Op0Reg == 0) return false;
952 unsigned Op1Reg = getRegForValue(I->getOperand(1));
953 if (Op1Reg == 0) return false;
954 unsigned Op2Reg = getRegForValue(I->getOperand(2));
955 if (Op2Reg == 0) return false;
957 BuildMI(MBB, DL, TII.get(X86::TEST8rr)).addReg(Op0Reg).addReg(Op0Reg);
958 unsigned ResultReg = createResultReg(RC);
959 BuildMI(MBB, DL, TII.get(Opc), ResultReg).addReg(Op1Reg).addReg(Op2Reg);
960 UpdateValueMap(I, ResultReg);
964 bool X86FastISel::X86SelectFPExt(Instruction *I) {
965 // fpext from float to double.
966 if (Subtarget->hasSSE2() && I->getType() == Type::DoubleTy) {
967 Value *V = I->getOperand(0);
968 if (V->getType() == Type::FloatTy) {
969 unsigned OpReg = getRegForValue(V);
970 if (OpReg == 0) return false;
971 unsigned ResultReg = createResultReg(X86::FR64RegisterClass);
972 BuildMI(MBB, DL, TII.get(X86::CVTSS2SDrr), ResultReg).addReg(OpReg);
973 UpdateValueMap(I, ResultReg);
981 bool X86FastISel::X86SelectFPTrunc(Instruction *I) {
982 if (Subtarget->hasSSE2()) {
983 if (I->getType() == Type::FloatTy) {
984 Value *V = I->getOperand(0);
985 if (V->getType() == Type::DoubleTy) {
986 unsigned OpReg = getRegForValue(V);
987 if (OpReg == 0) return false;
988 unsigned ResultReg = createResultReg(X86::FR32RegisterClass);
989 BuildMI(MBB, DL, TII.get(X86::CVTSD2SSrr), ResultReg).addReg(OpReg);
990 UpdateValueMap(I, ResultReg);
999 bool X86FastISel::X86SelectTrunc(Instruction *I) {
1000 if (Subtarget->is64Bit())
1001 // All other cases should be handled by the tblgen generated code.
1003 MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
1004 MVT DstVT = TLI.getValueType(I->getType());
1006 // This code only handles truncation to byte right now.
1007 if (DstVT != MVT::i8 && DstVT != MVT::i1)
1008 // All other cases should be handled by the tblgen generated code.
1010 if (SrcVT != MVT::i16 && SrcVT != MVT::i32)
1011 // All other cases should be handled by the tblgen generated code.
1014 unsigned InputReg = getRegForValue(I->getOperand(0));
1016 // Unhandled operand. Halt "fast" selection and bail.
1019 // First issue a copy to GR16_ or GR32_.
1020 unsigned CopyOpc = (SrcVT == MVT::i16) ? X86::MOV16to16_ : X86::MOV32to32_;
1021 const TargetRegisterClass *CopyRC = (SrcVT == MVT::i16)
1022 ? X86::GR16_RegisterClass : X86::GR32_RegisterClass;
1023 unsigned CopyReg = createResultReg(CopyRC);
1024 BuildMI(MBB, DL, TII.get(CopyOpc), CopyReg).addReg(InputReg);
1026 // Then issue an extract_subreg.
1027 unsigned ResultReg = FastEmitInst_extractsubreg(MVT::i8,
1028 CopyReg, X86::SUBREG_8BIT);
1032 UpdateValueMap(I, ResultReg);
1036 bool X86FastISel::X86SelectExtractValue(Instruction *I) {
1037 ExtractValueInst *EI = cast<ExtractValueInst>(I);
1038 Value *Agg = EI->getAggregateOperand();
1040 if (CallInst *CI = dyn_cast<CallInst>(Agg)) {
1041 Function *F = CI->getCalledFunction();
1043 if (F && F->isDeclaration()) {
1044 switch (F->getIntrinsicID()) {
1046 case Intrinsic::sadd_with_overflow:
1047 case Intrinsic::uadd_with_overflow:
1048 // Cheat a little. We know that the registers for "add" and "seto" are
1049 // allocated sequentially. However, we only keep track of the register
1050 // for "add" in the value map. Use extractvalue's index to get the
1051 // correct register for "seto".
1052 UpdateValueMap(I, lookUpRegForValue(Agg) + *EI->idx_begin());
1061 bool X86FastISel::X86VisitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
1062 // FIXME: Handle more intrinsics.
1063 switch (Intrinsic) {
1064 default: return false;
1065 case Intrinsic::sadd_with_overflow:
1066 case Intrinsic::uadd_with_overflow: {
1067 // Replace "add with overflow" intrinsics with an "add" instruction followed
1068 // by a seto/setc instruction. Later on, when the "extractvalue"
1069 // instructions are encountered, we use the fact that two registers were
1070 // created sequentially to get the correct registers for the "sum" and the
1073 const Function *Callee = I.getCalledFunction();
1075 cast<StructType>(Callee->getReturnType())->getTypeAtIndex(unsigned(0));
1077 if (!isTypeLegal(RetTy, VT))
1080 Value *Op1 = I.getOperand(1);
1081 Value *Op2 = I.getOperand(2);
1082 unsigned Reg1 = getRegForValue(Op1);
1083 unsigned Reg2 = getRegForValue(Op2);
1085 if (Reg1 == 0 || Reg2 == 0)
1086 // FIXME: Handle values *not* in registers.
1093 else if (VT == MVT::i64)
1098 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
1099 BuildMI(MBB, DL, TII.get(OpC), ResultReg).addReg(Reg1).addReg(Reg2);
1100 UpdateValueMap(&I, ResultReg);
1102 ResultReg = createResultReg(TLI.getRegClassFor(MVT::i8));
1103 BuildMI(MBB, DL, TII.get((Intrinsic == Intrinsic::sadd_with_overflow) ?
1104 X86::SETOr : X86::SETBr), ResultReg);
1110 bool X86FastISel::X86SelectCall(Instruction *I) {
1111 CallInst *CI = cast<CallInst>(I);
1112 Value *Callee = I->getOperand(0);
1114 // Can't handle inline asm yet.
1115 if (isa<InlineAsm>(Callee))
1118 // Handle intrinsic calls.
1119 if (Function *F = CI->getCalledFunction())
1120 if (F->isDeclaration())
1121 if (unsigned IID = F->getIntrinsicID())
1122 return X86VisitIntrinsicCall(*CI, IID);
1124 // Handle only C and fastcc calling conventions for now.
1126 unsigned CC = CS.getCallingConv();
1127 if (CC != CallingConv::C &&
1128 CC != CallingConv::Fast &&
1129 CC != CallingConv::X86_FastCall)
1132 // Let SDISel handle vararg functions.
1133 const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
1134 const FunctionType *FTy = cast<FunctionType>(PT->getElementType());
1135 if (FTy->isVarArg())
1138 // Handle *simple* calls for now.
1139 const Type *RetTy = CS.getType();
1141 if (RetTy == Type::VoidTy)
1142 RetVT = MVT::isVoid;
1143 else if (!isTypeLegal(RetTy, RetVT, true))
1146 // Materialize callee address in a register. FIXME: GV address can be
1147 // handled with a CALLpcrel32 instead.
1148 X86AddressMode CalleeAM;
1149 if (!X86SelectAddress(Callee, CalleeAM, true))
1151 unsigned CalleeOp = 0;
1152 GlobalValue *GV = 0;
1153 if (CalleeAM.Base.Reg != 0) {
1154 assert(CalleeAM.GV == 0);
1155 CalleeOp = CalleeAM.Base.Reg;
1156 } else if (CalleeAM.GV != 0) {
1157 assert(CalleeAM.GV != 0);
1162 // Allow calls which produce i1 results.
1163 bool AndToI1 = false;
1164 if (RetVT == MVT::i1) {
1169 // Deal with call operands first.
1170 SmallVector<Value*, 8> ArgVals;
1171 SmallVector<unsigned, 8> Args;
1172 SmallVector<MVT, 8> ArgVTs;
1173 SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
1174 Args.reserve(CS.arg_size());
1175 ArgVals.reserve(CS.arg_size());
1176 ArgVTs.reserve(CS.arg_size());
1177 ArgFlags.reserve(CS.arg_size());
1178 for (CallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
1180 unsigned Arg = getRegForValue(*i);
1183 ISD::ArgFlagsTy Flags;
1184 unsigned AttrInd = i - CS.arg_begin() + 1;
1185 if (CS.paramHasAttr(AttrInd, Attribute::SExt))
1187 if (CS.paramHasAttr(AttrInd, Attribute::ZExt))
1190 // FIXME: Only handle *easy* calls for now.
1191 if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
1192 CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
1193 CS.paramHasAttr(AttrInd, Attribute::Nest) ||
1194 CS.paramHasAttr(AttrInd, Attribute::ByVal))
1197 const Type *ArgTy = (*i)->getType();
1199 if (!isTypeLegal(ArgTy, ArgVT))
1201 unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
1202 Flags.setOrigAlign(OriginalAlignment);
1204 Args.push_back(Arg);
1205 ArgVals.push_back(*i);
1206 ArgVTs.push_back(ArgVT);
1207 ArgFlags.push_back(Flags);
1210 // Analyze operands of the call, assigning locations to each operand.
1211 SmallVector<CCValAssign, 16> ArgLocs;
1212 CCState CCInfo(CC, false, TM, ArgLocs);
1213 CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CCAssignFnForCall(CC));
1215 // Get a count of how many bytes are to be pushed on the stack.
1216 unsigned NumBytes = CCInfo.getNextStackOffset();
1218 // Issue CALLSEQ_START
1219 unsigned AdjStackDown = TM.getRegisterInfo()->getCallFrameSetupOpcode();
1220 BuildMI(MBB, DL, TII.get(AdjStackDown)).addImm(NumBytes);
1222 // Process argument: walk the register/memloc assignments, inserting
1224 SmallVector<unsigned, 4> RegArgs;
1225 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1226 CCValAssign &VA = ArgLocs[i];
1227 unsigned Arg = Args[VA.getValNo()];
1228 MVT ArgVT = ArgVTs[VA.getValNo()];
1230 // Promote the value if needed.
1231 switch (VA.getLocInfo()) {
1232 default: assert(0 && "Unknown loc info!");
1233 case CCValAssign::Full: break;
1234 case CCValAssign::SExt: {
1235 bool Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
1237 assert(Emitted && "Failed to emit a sext!"); Emitted=Emitted;
1239 ArgVT = VA.getLocVT();
1242 case CCValAssign::ZExt: {
1243 bool Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
1245 assert(Emitted && "Failed to emit a zext!"); Emitted=Emitted;
1247 ArgVT = VA.getLocVT();
1250 case CCValAssign::AExt: {
1251 bool Emitted = X86FastEmitExtend(ISD::ANY_EXTEND, VA.getLocVT(),
1254 Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
1257 Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
1260 assert(Emitted && "Failed to emit a aext!"); Emitted=Emitted;
1261 ArgVT = VA.getLocVT();
1266 if (VA.isRegLoc()) {
1267 TargetRegisterClass* RC = TLI.getRegClassFor(ArgVT);
1268 bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), VA.getLocReg(),
1270 assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
1272 RegArgs.push_back(VA.getLocReg());
1274 unsigned LocMemOffset = VA.getLocMemOffset();
1276 AM.Base.Reg = StackPtr;
1277 AM.Disp = LocMemOffset;
1278 Value *ArgVal = ArgVals[VA.getValNo()];
1280 // If this is a really simple value, emit this with the Value* version of
1281 // X86FastEmitStore. If it isn't simple, we don't want to do this, as it
1282 // can cause us to reevaluate the argument.
1283 if (isa<ConstantInt>(ArgVal) || isa<ConstantPointerNull>(ArgVal))
1284 X86FastEmitStore(ArgVT, ArgVal, AM);
1286 X86FastEmitStore(ArgVT, Arg, AM);
1290 // ELF / PIC requires GOT in the EBX register before function calls via PLT
1292 if (!Subtarget->is64Bit() &&
1293 TM.getRelocationModel() == Reloc::PIC_ &&
1294 Subtarget->isPICStyleGOT()) {
1295 TargetRegisterClass *RC = X86::GR32RegisterClass;
1296 unsigned Base = getInstrInfo()->getGlobalBaseReg(&MF);
1297 bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), X86::EBX, Base, RC, RC);
1298 assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
1303 unsigned CallOpc = CalleeOp
1304 ? (Subtarget->is64Bit() ? X86::CALL64r : X86::CALL32r)
1305 : (Subtarget->is64Bit() ? X86::CALL64pcrel32 : X86::CALLpcrel32);
1306 MachineInstrBuilder MIB = CalleeOp
1307 ? BuildMI(MBB, DL, TII.get(CallOpc)).addReg(CalleeOp)
1308 : BuildMI(MBB, DL, TII.get(CallOpc)).addGlobalAddress(GV);
1310 // Add an implicit use GOT pointer in EBX.
1311 if (!Subtarget->is64Bit() &&
1312 TM.getRelocationModel() == Reloc::PIC_ &&
1313 Subtarget->isPICStyleGOT())
1314 MIB.addReg(X86::EBX);
1316 // Add implicit physical register uses to the call.
1317 for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
1318 MIB.addReg(RegArgs[i]);
1320 // Issue CALLSEQ_END
1321 unsigned AdjStackUp = TM.getRegisterInfo()->getCallFrameDestroyOpcode();
1322 BuildMI(MBB, DL, TII.get(AdjStackUp)).addImm(NumBytes).addImm(0);
1324 // Now handle call return value (if any).
1325 if (RetVT.getSimpleVT() != MVT::isVoid) {
1326 SmallVector<CCValAssign, 16> RVLocs;
1327 CCState CCInfo(CC, false, TM, RVLocs);
1328 CCInfo.AnalyzeCallResult(RetVT, RetCC_X86);
1330 // Copy all of the result registers out of their specified physreg.
1331 assert(RVLocs.size() == 1 && "Can't handle multi-value calls!");
1332 MVT CopyVT = RVLocs[0].getValVT();
1333 TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
1334 TargetRegisterClass *SrcRC = DstRC;
1336 // If this is a call to a function that returns an fp value on the x87 fp
1337 // stack, but where we prefer to use the value in xmm registers, copy it
1338 // out as F80 and use a truncate to move it from fp stack reg to xmm reg.
1339 if ((RVLocs[0].getLocReg() == X86::ST0 ||
1340 RVLocs[0].getLocReg() == X86::ST1) &&
1341 isScalarFPTypeInSSEReg(RVLocs[0].getValVT())) {
1343 SrcRC = X86::RSTRegisterClass;
1344 DstRC = X86::RFP80RegisterClass;
1347 unsigned ResultReg = createResultReg(DstRC);
1348 bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
1349 RVLocs[0].getLocReg(), DstRC, SrcRC);
1350 assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
1352 if (CopyVT != RVLocs[0].getValVT()) {
1353 // Round the F80 the right size, which also moves to the appropriate xmm
1354 // register. This is accomplished by storing the F80 value in memory and
1355 // then loading it back. Ewww...
1356 MVT ResVT = RVLocs[0].getValVT();
1357 unsigned Opc = ResVT == MVT::f32 ? X86::ST_Fp80m32 : X86::ST_Fp80m64;
1358 unsigned MemSize = ResVT.getSizeInBits()/8;
1359 int FI = MFI.CreateStackObject(MemSize, MemSize);
1360 addFrameReference(BuildMI(MBB, DL, TII.get(Opc)), FI).addReg(ResultReg);
1361 DstRC = ResVT == MVT::f32
1362 ? X86::FR32RegisterClass : X86::FR64RegisterClass;
1363 Opc = ResVT == MVT::f32 ? X86::MOVSSrm : X86::MOVSDrm;
1364 ResultReg = createResultReg(DstRC);
1365 addFrameReference(BuildMI(MBB, DL, TII.get(Opc), ResultReg), FI);
1369 // Mask out all but lowest bit for some call which produces an i1.
1370 unsigned AndResult = createResultReg(X86::GR8RegisterClass);
1372 TII.get(X86::AND8ri), AndResult).addReg(ResultReg).addImm(1);
1373 ResultReg = AndResult;
1376 UpdateValueMap(I, ResultReg);
1384 X86FastISel::TargetSelectInstruction(Instruction *I) {
1385 switch (I->getOpcode()) {
1387 case Instruction::Load:
1388 return X86SelectLoad(I);
1389 case Instruction::Store:
1390 return X86SelectStore(I);
1391 case Instruction::ICmp:
1392 case Instruction::FCmp:
1393 return X86SelectCmp(I);
1394 case Instruction::ZExt:
1395 return X86SelectZExt(I);
1396 case Instruction::Br:
1397 return X86SelectBranch(I);
1398 case Instruction::Call:
1399 return X86SelectCall(I);
1400 case Instruction::LShr:
1401 case Instruction::AShr:
1402 case Instruction::Shl:
1403 return X86SelectShift(I);
1404 case Instruction::Select:
1405 return X86SelectSelect(I);
1406 case Instruction::Trunc:
1407 return X86SelectTrunc(I);
1408 case Instruction::FPExt:
1409 return X86SelectFPExt(I);
1410 case Instruction::FPTrunc:
1411 return X86SelectFPTrunc(I);
1412 case Instruction::ExtractValue:
1413 return X86SelectExtractValue(I);
1419 unsigned X86FastISel::TargetMaterializeConstant(Constant *C) {
1421 if (!isTypeLegal(C->getType(), VT))
1424 // Get opcode and regclass of the output for the given load instruction.
1426 const TargetRegisterClass *RC = NULL;
1427 switch (VT.getSimpleVT()) {
1428 default: return false;
1431 RC = X86::GR8RegisterClass;
1435 RC = X86::GR16RegisterClass;
1439 RC = X86::GR32RegisterClass;
1442 // Must be in x86-64 mode.
1444 RC = X86::GR64RegisterClass;
1447 if (Subtarget->hasSSE1()) {
1449 RC = X86::FR32RegisterClass;
1451 Opc = X86::LD_Fp32m;
1452 RC = X86::RFP32RegisterClass;
1456 if (Subtarget->hasSSE2()) {
1458 RC = X86::FR64RegisterClass;
1460 Opc = X86::LD_Fp64m;
1461 RC = X86::RFP64RegisterClass;
1465 // No f80 support yet.
1469 // Materialize addresses with LEA instructions.
1470 if (isa<GlobalValue>(C)) {
1472 if (X86SelectAddress(C, AM, false)) {
1473 if (TLI.getPointerTy() == MVT::i32)
1477 unsigned ResultReg = createResultReg(RC);
1478 addFullAddress(BuildMI(MBB, DL, TII.get(Opc), ResultReg), AM);
1484 // MachineConstantPool wants an explicit alignment.
1485 unsigned Align = TD.getPrefTypeAlignment(C->getType());
1487 // Alignment of vector types. FIXME!
1488 Align = TD.getTypePaddedSize(C->getType());
1491 // x86-32 PIC requires a PIC base register for constant pools.
1492 unsigned PICBase = 0;
1493 if (TM.getRelocationModel() == Reloc::PIC_ &&
1494 !Subtarget->is64Bit())
1495 PICBase = getInstrInfo()->getGlobalBaseReg(&MF);
1497 // Create the load from the constant pool.
1498 unsigned MCPOffset = MCP.getConstantPoolIndex(C, Align);
1499 unsigned ResultReg = createResultReg(RC);
1500 addConstantPoolReference(BuildMI(MBB, DL, TII.get(Opc), ResultReg), MCPOffset,
1506 unsigned X86FastISel::TargetMaterializeAlloca(AllocaInst *C) {
1507 // Fail on dynamic allocas. At this point, getRegForValue has already
1508 // checked its CSE maps, so if we're here trying to handle a dynamic
1509 // alloca, we're not going to succeed. X86SelectAddress has a
1510 // check for dynamic allocas, because it's called directly from
1511 // various places, but TargetMaterializeAlloca also needs a check
1512 // in order to avoid recursion between getRegForValue,
1513 // X86SelectAddrss, and TargetMaterializeAlloca.
1514 if (!StaticAllocaMap.count(C))
1518 if (!X86SelectAddress(C, AM, false))
1520 unsigned Opc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
1521 TargetRegisterClass* RC = TLI.getRegClassFor(TLI.getPointerTy());
1522 unsigned ResultReg = createResultReg(RC);
1523 addFullAddress(BuildMI(MBB, DL, TII.get(Opc), ResultReg), AM);
1528 llvm::FastISel *X86::createFastISel(MachineFunction &mf,
1529 MachineModuleInfo *mmi,
1531 DenseMap<const Value *, unsigned> &vm,
1532 DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
1533 DenseMap<const AllocaInst *, int> &am
1535 , SmallSet<Instruction*, 8> &cil
1538 return new X86FastISel(mf, mmi, dw, vm, bm, am