1 //===-- llvm/CodeGen/GlobalISel/IRTranslator.cpp - IRTranslator --*- C++ -*-==//
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 implements the IRTranslator class.
11 //===----------------------------------------------------------------------===//
13 #include "llvm/CodeGen/GlobalISel/IRTranslator.h"
15 #include "llvm/ADT/ScopeExit.h"
16 #include "llvm/ADT/SmallSet.h"
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/Analysis/OptimizationDiagnosticInfo.h"
19 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
20 #include "llvm/CodeGen/Analysis.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineModuleInfo.h"
24 #include "llvm/CodeGen/MachineRegisterInfo.h"
25 #include "llvm/CodeGen/TargetPassConfig.h"
26 #include "llvm/IR/Constant.h"
27 #include "llvm/IR/DebugInfo.h"
28 #include "llvm/IR/Function.h"
29 #include "llvm/IR/GetElementPtrTypeIterator.h"
30 #include "llvm/IR/IntrinsicInst.h"
31 #include "llvm/IR/Type.h"
32 #include "llvm/IR/Value.h"
33 #include "llvm/Target/TargetFrameLowering.h"
34 #include "llvm/Target/TargetIntrinsicInfo.h"
35 #include "llvm/Target/TargetLowering.h"
37 #define DEBUG_TYPE "irtranslator"
41 char IRTranslator::ID = 0;
42 INITIALIZE_PASS_BEGIN(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI",
44 INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
45 INITIALIZE_PASS_END(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI",
48 static void reportTranslationError(MachineFunction &MF,
49 const TargetPassConfig &TPC,
50 OptimizationRemarkEmitter &ORE,
51 OptimizationRemarkMissed &R) {
52 MF.getProperties().set(MachineFunctionProperties::Property::FailedISel);
54 // Print the function name explicitly if we don't have a debug location (which
55 // makes the diagnostic less useful) or if we're going to emit a raw error.
56 if (!R.getLocation().isValid() || TPC.isGlobalISelAbortEnabled())
57 R << (" (in function: " + MF.getName() + ")").str();
59 if (TPC.isGlobalISelAbortEnabled())
60 report_fatal_error(R.getMsg());
65 IRTranslator::IRTranslator() : MachineFunctionPass(ID), MRI(nullptr) {
66 initializeIRTranslatorPass(*PassRegistry::getPassRegistry());
69 void IRTranslator::getAnalysisUsage(AnalysisUsage &AU) const {
70 AU.addRequired<TargetPassConfig>();
71 MachineFunctionPass::getAnalysisUsage(AU);
75 unsigned IRTranslator::getOrCreateVReg(const Value &Val) {
76 unsigned &ValReg = ValToVReg[&Val];
81 // Fill ValRegsSequence with the sequence of registers
82 // we need to concat together to produce the value.
83 assert(Val.getType()->isSized() &&
84 "Don't know how to create an empty vreg");
86 MRI->createGenericVirtualRegister(getLLTForType(*Val.getType(), *DL));
89 if (auto CV = dyn_cast<Constant>(&Val)) {
90 bool Success = translate(*CV, VReg);
92 OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
93 MF->getFunction()->getSubprogram(),
94 &MF->getFunction()->getEntryBlock());
95 R << "unable to translate constant: " << ore::NV("Type", Val.getType());
96 reportTranslationError(*MF, *TPC, *ORE, R);
104 int IRTranslator::getOrCreateFrameIndex(const AllocaInst &AI) {
105 if (FrameIndices.find(&AI) != FrameIndices.end())
106 return FrameIndices[&AI];
108 unsigned ElementSize = DL->getTypeStoreSize(AI.getAllocatedType());
110 ElementSize * cast<ConstantInt>(AI.getArraySize())->getZExtValue();
112 // Always allocate at least one byte.
113 Size = std::max(Size, 1u);
115 unsigned Alignment = AI.getAlignment();
117 Alignment = DL->getABITypeAlignment(AI.getAllocatedType());
119 int &FI = FrameIndices[&AI];
120 FI = MF->getFrameInfo().CreateStackObject(Size, Alignment, false, &AI);
124 unsigned IRTranslator::getMemOpAlignment(const Instruction &I) {
125 unsigned Alignment = 0;
126 Type *ValTy = nullptr;
127 if (const StoreInst *SI = dyn_cast<StoreInst>(&I)) {
128 Alignment = SI->getAlignment();
129 ValTy = SI->getValueOperand()->getType();
130 } else if (const LoadInst *LI = dyn_cast<LoadInst>(&I)) {
131 Alignment = LI->getAlignment();
132 ValTy = LI->getType();
134 OptimizationRemarkMissed R("gisel-irtranslator", "", &I);
135 R << "unable to translate memop: " << ore::NV("Opcode", &I);
136 reportTranslationError(*MF, *TPC, *ORE, R);
140 return Alignment ? Alignment : DL->getABITypeAlignment(ValTy);
143 MachineBasicBlock &IRTranslator::getMBB(const BasicBlock &BB) {
144 MachineBasicBlock *&MBB = BBToMBB[&BB];
145 assert(MBB && "BasicBlock was not encountered before");
149 void IRTranslator::addMachineCFGPred(CFGEdge Edge, MachineBasicBlock *NewPred) {
150 assert(NewPred && "new predecessor must be a real MachineBasicBlock");
151 MachinePreds[Edge].push_back(NewPred);
154 bool IRTranslator::translateBinaryOp(unsigned Opcode, const User &U,
155 MachineIRBuilder &MIRBuilder) {
156 // FIXME: handle signed/unsigned wrapping flags.
158 // Get or create a virtual register for each value.
159 // Unless the value is a Constant => loadimm cst?
160 // or inline constant each time?
161 // Creation of a virtual register needs to have a size.
162 unsigned Op0 = getOrCreateVReg(*U.getOperand(0));
163 unsigned Op1 = getOrCreateVReg(*U.getOperand(1));
164 unsigned Res = getOrCreateVReg(U);
165 MIRBuilder.buildInstr(Opcode).addDef(Res).addUse(Op0).addUse(Op1);
169 bool IRTranslator::translateFSub(const User &U, MachineIRBuilder &MIRBuilder) {
170 // -0.0 - X --> G_FNEG
171 if (isa<Constant>(U.getOperand(0)) &&
172 U.getOperand(0) == ConstantFP::getZeroValueForNegation(U.getType())) {
173 MIRBuilder.buildInstr(TargetOpcode::G_FNEG)
174 .addDef(getOrCreateVReg(U))
175 .addUse(getOrCreateVReg(*U.getOperand(1)));
178 return translateBinaryOp(TargetOpcode::G_FSUB, U, MIRBuilder);
181 bool IRTranslator::translateCompare(const User &U,
182 MachineIRBuilder &MIRBuilder) {
183 const CmpInst *CI = dyn_cast<CmpInst>(&U);
184 unsigned Op0 = getOrCreateVReg(*U.getOperand(0));
185 unsigned Op1 = getOrCreateVReg(*U.getOperand(1));
186 unsigned Res = getOrCreateVReg(U);
187 CmpInst::Predicate Pred =
188 CI ? CI->getPredicate() : static_cast<CmpInst::Predicate>(
189 cast<ConstantExpr>(U).getPredicate());
190 if (CmpInst::isIntPredicate(Pred))
191 MIRBuilder.buildICmp(Pred, Res, Op0, Op1);
192 else if (Pred == CmpInst::FCMP_FALSE)
193 MIRBuilder.buildConstant(Res, 0);
194 else if (Pred == CmpInst::FCMP_TRUE)
195 MIRBuilder.buildConstant(Res, 1);
197 MIRBuilder.buildFCmp(Pred, Res, Op0, Op1);
202 bool IRTranslator::translateRet(const User &U, MachineIRBuilder &MIRBuilder) {
203 const ReturnInst &RI = cast<ReturnInst>(U);
204 const Value *Ret = RI.getReturnValue();
205 // The target may mess up with the insertion point, but
206 // this is not important as a return is the last instruction
207 // of the block anyway.
208 return CLI->lowerReturn(MIRBuilder, Ret, !Ret ? 0 : getOrCreateVReg(*Ret));
211 bool IRTranslator::translateBr(const User &U, MachineIRBuilder &MIRBuilder) {
212 const BranchInst &BrInst = cast<BranchInst>(U);
214 if (!BrInst.isUnconditional()) {
215 // We want a G_BRCOND to the true BB followed by an unconditional branch.
216 unsigned Tst = getOrCreateVReg(*BrInst.getCondition());
217 const BasicBlock &TrueTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ++));
218 MachineBasicBlock &TrueBB = getMBB(TrueTgt);
219 MIRBuilder.buildBrCond(Tst, TrueBB);
222 const BasicBlock &BrTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ));
223 MachineBasicBlock &TgtBB = getMBB(BrTgt);
224 MIRBuilder.buildBr(TgtBB);
227 MachineBasicBlock &CurBB = MIRBuilder.getMBB();
228 for (const BasicBlock *Succ : BrInst.successors())
229 CurBB.addSuccessor(&getMBB(*Succ));
233 bool IRTranslator::translateSwitch(const User &U,
234 MachineIRBuilder &MIRBuilder) {
235 // For now, just translate as a chain of conditional branches.
236 // FIXME: could we share most of the logic/code in
237 // SelectionDAGBuilder::visitSwitch between SelectionDAG and GlobalISel?
238 // At first sight, it seems most of the logic in there is independent of
239 // SelectionDAG-specifics and a lot of work went in to optimize switch
240 // lowering in there.
242 const SwitchInst &SwInst = cast<SwitchInst>(U);
243 const unsigned SwCondValue = getOrCreateVReg(*SwInst.getCondition());
244 const BasicBlock *OrigBB = SwInst.getParent();
246 LLT LLTi1 = getLLTForType(*Type::getInt1Ty(U.getContext()), *DL);
247 for (auto &CaseIt : SwInst.cases()) {
248 const unsigned CaseValueReg = getOrCreateVReg(*CaseIt.getCaseValue());
249 const unsigned Tst = MRI->createGenericVirtualRegister(LLTi1);
250 MIRBuilder.buildICmp(CmpInst::ICMP_EQ, Tst, CaseValueReg, SwCondValue);
251 MachineBasicBlock &CurMBB = MIRBuilder.getMBB();
252 const BasicBlock *TrueBB = CaseIt.getCaseSuccessor();
253 MachineBasicBlock &TrueMBB = getMBB(*TrueBB);
255 MIRBuilder.buildBrCond(Tst, TrueMBB);
256 CurMBB.addSuccessor(&TrueMBB);
257 addMachineCFGPred({OrigBB, TrueBB}, &CurMBB);
259 MachineBasicBlock *FalseMBB =
260 MF->CreateMachineBasicBlock(SwInst.getParent());
261 MF->push_back(FalseMBB);
262 MIRBuilder.buildBr(*FalseMBB);
263 CurMBB.addSuccessor(FalseMBB);
265 MIRBuilder.setMBB(*FalseMBB);
267 // handle default case
268 const BasicBlock *DefaultBB = SwInst.getDefaultDest();
269 MachineBasicBlock &DefaultMBB = getMBB(*DefaultBB);
270 MIRBuilder.buildBr(DefaultMBB);
271 MachineBasicBlock &CurMBB = MIRBuilder.getMBB();
272 CurMBB.addSuccessor(&DefaultMBB);
273 addMachineCFGPred({OrigBB, DefaultBB}, &CurMBB);
278 bool IRTranslator::translateIndirectBr(const User &U,
279 MachineIRBuilder &MIRBuilder) {
280 const IndirectBrInst &BrInst = cast<IndirectBrInst>(U);
282 const unsigned Tgt = getOrCreateVReg(*BrInst.getAddress());
283 MIRBuilder.buildBrIndirect(Tgt);
286 MachineBasicBlock &CurBB = MIRBuilder.getMBB();
287 for (const BasicBlock *Succ : BrInst.successors())
288 CurBB.addSuccessor(&getMBB(*Succ));
293 bool IRTranslator::translateLoad(const User &U, MachineIRBuilder &MIRBuilder) {
294 const LoadInst &LI = cast<LoadInst>(U);
296 auto Flags = LI.isVolatile() ? MachineMemOperand::MOVolatile
297 : MachineMemOperand::MONone;
298 Flags |= MachineMemOperand::MOLoad;
300 unsigned Res = getOrCreateVReg(LI);
301 unsigned Addr = getOrCreateVReg(*LI.getPointerOperand());
303 MIRBuilder.buildLoad(
305 *MF->getMachineMemOperand(MachinePointerInfo(LI.getPointerOperand()),
306 Flags, DL->getTypeStoreSize(LI.getType()),
307 getMemOpAlignment(LI), AAMDNodes(), nullptr,
308 LI.getSynchScope(), LI.getOrdering()));
312 bool IRTranslator::translateStore(const User &U, MachineIRBuilder &MIRBuilder) {
313 const StoreInst &SI = cast<StoreInst>(U);
314 auto Flags = SI.isVolatile() ? MachineMemOperand::MOVolatile
315 : MachineMemOperand::MONone;
316 Flags |= MachineMemOperand::MOStore;
318 unsigned Val = getOrCreateVReg(*SI.getValueOperand());
319 unsigned Addr = getOrCreateVReg(*SI.getPointerOperand());
321 MIRBuilder.buildStore(
323 *MF->getMachineMemOperand(
324 MachinePointerInfo(SI.getPointerOperand()), Flags,
325 DL->getTypeStoreSize(SI.getValueOperand()->getType()),
326 getMemOpAlignment(SI), AAMDNodes(), nullptr, SI.getSynchScope(),
331 bool IRTranslator::translateExtractValue(const User &U,
332 MachineIRBuilder &MIRBuilder) {
333 const Value *Src = U.getOperand(0);
334 Type *Int32Ty = Type::getInt32Ty(U.getContext());
335 SmallVector<Value *, 1> Indices;
337 // getIndexedOffsetInType is designed for GEPs, so the first index is the
338 // usual array element rather than looking into the actual aggregate.
339 Indices.push_back(ConstantInt::get(Int32Ty, 0));
341 if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(&U)) {
342 for (auto Idx : EVI->indices())
343 Indices.push_back(ConstantInt::get(Int32Ty, Idx));
345 for (unsigned i = 1; i < U.getNumOperands(); ++i)
346 Indices.push_back(U.getOperand(i));
349 uint64_t Offset = 8 * DL->getIndexedOffsetInType(Src->getType(), Indices);
351 unsigned Res = getOrCreateVReg(U);
352 MIRBuilder.buildExtract(Res, getOrCreateVReg(*Src), Offset);
357 bool IRTranslator::translateInsertValue(const User &U,
358 MachineIRBuilder &MIRBuilder) {
359 const Value *Src = U.getOperand(0);
360 Type *Int32Ty = Type::getInt32Ty(U.getContext());
361 SmallVector<Value *, 1> Indices;
363 // getIndexedOffsetInType is designed for GEPs, so the first index is the
364 // usual array element rather than looking into the actual aggregate.
365 Indices.push_back(ConstantInt::get(Int32Ty, 0));
367 if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(&U)) {
368 for (auto Idx : IVI->indices())
369 Indices.push_back(ConstantInt::get(Int32Ty, Idx));
371 for (unsigned i = 2; i < U.getNumOperands(); ++i)
372 Indices.push_back(U.getOperand(i));
375 uint64_t Offset = 8 * DL->getIndexedOffsetInType(Src->getType(), Indices);
377 unsigned Res = getOrCreateVReg(U);
378 const Value &Inserted = *U.getOperand(1);
379 MIRBuilder.buildInsert(Res, getOrCreateVReg(*Src), getOrCreateVReg(Inserted),
385 bool IRTranslator::translateSelect(const User &U,
386 MachineIRBuilder &MIRBuilder) {
387 MIRBuilder.buildSelect(getOrCreateVReg(U), getOrCreateVReg(*U.getOperand(0)),
388 getOrCreateVReg(*U.getOperand(1)),
389 getOrCreateVReg(*U.getOperand(2)));
393 bool IRTranslator::translateBitCast(const User &U,
394 MachineIRBuilder &MIRBuilder) {
395 // If we're bitcasting to the source type, we can reuse the source vreg.
396 if (getLLTForType(*U.getOperand(0)->getType(), *DL) ==
397 getLLTForType(*U.getType(), *DL)) {
398 // Get the source vreg now, to avoid invalidating ValToVReg.
399 unsigned SrcReg = getOrCreateVReg(*U.getOperand(0));
400 unsigned &Reg = ValToVReg[&U];
401 // If we already assigned a vreg for this bitcast, we can't change that.
402 // Emit a copy to satisfy the users we already emitted.
404 MIRBuilder.buildCopy(Reg, SrcReg);
409 return translateCast(TargetOpcode::G_BITCAST, U, MIRBuilder);
412 bool IRTranslator::translateCast(unsigned Opcode, const User &U,
413 MachineIRBuilder &MIRBuilder) {
414 unsigned Op = getOrCreateVReg(*U.getOperand(0));
415 unsigned Res = getOrCreateVReg(U);
416 MIRBuilder.buildInstr(Opcode).addDef(Res).addUse(Op);
420 bool IRTranslator::translateGetElementPtr(const User &U,
421 MachineIRBuilder &MIRBuilder) {
422 // FIXME: support vector GEPs.
423 if (U.getType()->isVectorTy())
426 Value &Op0 = *U.getOperand(0);
427 unsigned BaseReg = getOrCreateVReg(Op0);
428 LLT PtrTy = getLLTForType(*Op0.getType(), *DL);
429 unsigned PtrSize = DL->getPointerSizeInBits(PtrTy.getAddressSpace());
430 LLT OffsetTy = LLT::scalar(PtrSize);
433 for (gep_type_iterator GTI = gep_type_begin(&U), E = gep_type_end(&U);
435 const Value *Idx = GTI.getOperand();
436 if (StructType *StTy = GTI.getStructTypeOrNull()) {
437 unsigned Field = cast<Constant>(Idx)->getUniqueInteger().getZExtValue();
438 Offset += DL->getStructLayout(StTy)->getElementOffset(Field);
441 uint64_t ElementSize = DL->getTypeAllocSize(GTI.getIndexedType());
443 // If this is a scalar constant or a splat vector of constants,
444 // handle it quickly.
445 if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {
446 Offset += ElementSize * CI->getSExtValue();
451 unsigned NewBaseReg = MRI->createGenericVirtualRegister(PtrTy);
452 unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy);
453 MIRBuilder.buildConstant(OffsetReg, Offset);
454 MIRBuilder.buildGEP(NewBaseReg, BaseReg, OffsetReg);
456 BaseReg = NewBaseReg;
460 // N = N + Idx * ElementSize;
461 unsigned ElementSizeReg = MRI->createGenericVirtualRegister(OffsetTy);
462 MIRBuilder.buildConstant(ElementSizeReg, ElementSize);
464 unsigned IdxReg = getOrCreateVReg(*Idx);
465 if (MRI->getType(IdxReg) != OffsetTy) {
466 unsigned NewIdxReg = MRI->createGenericVirtualRegister(OffsetTy);
467 MIRBuilder.buildSExtOrTrunc(NewIdxReg, IdxReg);
471 unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy);
472 MIRBuilder.buildMul(OffsetReg, ElementSizeReg, IdxReg);
474 unsigned NewBaseReg = MRI->createGenericVirtualRegister(PtrTy);
475 MIRBuilder.buildGEP(NewBaseReg, BaseReg, OffsetReg);
476 BaseReg = NewBaseReg;
481 unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy);
482 MIRBuilder.buildConstant(OffsetReg, Offset);
483 MIRBuilder.buildGEP(getOrCreateVReg(U), BaseReg, OffsetReg);
487 MIRBuilder.buildCopy(getOrCreateVReg(U), BaseReg);
491 bool IRTranslator::translateMemfunc(const CallInst &CI,
492 MachineIRBuilder &MIRBuilder,
494 LLT SizeTy = getLLTForType(*CI.getArgOperand(2)->getType(), *DL);
495 Type *DstTy = CI.getArgOperand(0)->getType();
496 if (cast<PointerType>(DstTy)->getAddressSpace() != 0 ||
497 SizeTy.getSizeInBits() != DL->getPointerSizeInBits(0))
500 SmallVector<CallLowering::ArgInfo, 8> Args;
501 for (int i = 0; i < 3; ++i) {
502 const auto &Arg = CI.getArgOperand(i);
503 Args.emplace_back(getOrCreateVReg(*Arg), Arg->getType());
508 case Intrinsic::memmove:
509 case Intrinsic::memcpy: {
510 Type *SrcTy = CI.getArgOperand(1)->getType();
511 if(cast<PointerType>(SrcTy)->getAddressSpace() != 0)
513 Callee = ID == Intrinsic::memcpy ? "memcpy" : "memmove";
516 case Intrinsic::memset:
523 return CLI->lowerCall(MIRBuilder, MachineOperand::CreateES(Callee),
524 CallLowering::ArgInfo(0, CI.getType()), Args);
527 void IRTranslator::getStackGuard(unsigned DstReg,
528 MachineIRBuilder &MIRBuilder) {
529 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
530 MRI->setRegClass(DstReg, TRI->getPointerRegClass(*MF));
531 auto MIB = MIRBuilder.buildInstr(TargetOpcode::LOAD_STACK_GUARD);
534 auto &TLI = *MF->getSubtarget().getTargetLowering();
535 Value *Global = TLI.getSDagStackGuard(*MF->getFunction()->getParent());
539 MachinePointerInfo MPInfo(Global);
540 MachineInstr::mmo_iterator MemRefs = MF->allocateMemRefsArray(1);
541 auto Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant |
542 MachineMemOperand::MODereferenceable;
544 MF->getMachineMemOperand(MPInfo, Flags, DL->getPointerSizeInBits() / 8,
545 DL->getPointerABIAlignment());
546 MIB.setMemRefs(MemRefs, MemRefs + 1);
549 bool IRTranslator::translateOverflowIntrinsic(const CallInst &CI, unsigned Op,
550 MachineIRBuilder &MIRBuilder) {
551 LLT Ty = getLLTForType(*CI.getOperand(0)->getType(), *DL);
552 LLT s1 = LLT::scalar(1);
553 unsigned Width = Ty.getSizeInBits();
554 unsigned Res = MRI->createGenericVirtualRegister(Ty);
555 unsigned Overflow = MRI->createGenericVirtualRegister(s1);
556 auto MIB = MIRBuilder.buildInstr(Op)
559 .addUse(getOrCreateVReg(*CI.getOperand(0)))
560 .addUse(getOrCreateVReg(*CI.getOperand(1)));
562 if (Op == TargetOpcode::G_UADDE || Op == TargetOpcode::G_USUBE) {
563 unsigned Zero = MRI->createGenericVirtualRegister(s1);
564 EntryBuilder.buildConstant(Zero, 0);
568 MIRBuilder.buildSequence(getOrCreateVReg(CI), Res, 0, Overflow, Width);
572 bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
573 MachineIRBuilder &MIRBuilder) {
577 case Intrinsic::lifetime_start:
578 case Intrinsic::lifetime_end:
579 // Stack coloring is not enabled in O0 (which we care about now) so we can
580 // drop these. Make sure someone notices when we start compiling at higher
582 if (MF->getTarget().getOptLevel() != CodeGenOpt::None)
585 case Intrinsic::dbg_declare: {
586 const DbgDeclareInst &DI = cast<DbgDeclareInst>(CI);
587 assert(DI.getVariable() && "Missing variable");
589 const Value *Address = DI.getAddress();
590 if (!Address || isa<UndefValue>(Address)) {
591 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n");
595 assert(DI.getVariable()->isValidLocationForIntrinsic(
596 MIRBuilder.getDebugLoc()) &&
597 "Expected inlined-at fields to agree");
598 auto AI = dyn_cast<AllocaInst>(Address);
599 if (AI && AI->isStaticAlloca()) {
600 // Static allocas are tracked at the MF level, no need for DBG_VALUE
601 // instructions (in fact, they get ignored if they *do* exist).
602 MF->setVariableDbgInfo(DI.getVariable(), DI.getExpression(),
603 getOrCreateFrameIndex(*AI), DI.getDebugLoc());
605 MIRBuilder.buildDirectDbgValue(getOrCreateVReg(*Address),
606 DI.getVariable(), DI.getExpression());
609 case Intrinsic::vaend:
610 // No target I know of cares about va_end. Certainly no in-tree target
611 // does. Simplest intrinsic ever!
613 case Intrinsic::vastart: {
614 auto &TLI = *MF->getSubtarget().getTargetLowering();
615 Value *Ptr = CI.getArgOperand(0);
616 unsigned ListSize = TLI.getVaListSizeInBits(*DL) / 8;
618 MIRBuilder.buildInstr(TargetOpcode::G_VASTART)
619 .addUse(getOrCreateVReg(*Ptr))
620 .addMemOperand(MF->getMachineMemOperand(
621 MachinePointerInfo(Ptr), MachineMemOperand::MOStore, ListSize, 0));
624 case Intrinsic::dbg_value: {
625 // This form of DBG_VALUE is target-independent.
626 const DbgValueInst &DI = cast<DbgValueInst>(CI);
627 const Value *V = DI.getValue();
628 assert(DI.getVariable()->isValidLocationForIntrinsic(
629 MIRBuilder.getDebugLoc()) &&
630 "Expected inlined-at fields to agree");
632 // Currently the optimizer can produce this; insert an undef to
633 // help debugging. Probably the optimizer should not do this.
634 MIRBuilder.buildIndirectDbgValue(0, DI.getOffset(), DI.getVariable(),
636 } else if (const auto *CI = dyn_cast<Constant>(V)) {
637 MIRBuilder.buildConstDbgValue(*CI, DI.getOffset(), DI.getVariable(),
640 unsigned Reg = getOrCreateVReg(*V);
641 // FIXME: This does not handle register-indirect values at offset 0. The
642 // direct/indirect thing shouldn't really be handled by something as
643 // implicit as reg+noreg vs reg+imm in the first palce, but it seems
644 // pretty baked in right now.
645 if (DI.getOffset() != 0)
646 MIRBuilder.buildIndirectDbgValue(Reg, DI.getOffset(), DI.getVariable(),
649 MIRBuilder.buildDirectDbgValue(Reg, DI.getVariable(),
654 case Intrinsic::uadd_with_overflow:
655 return translateOverflowIntrinsic(CI, TargetOpcode::G_UADDE, MIRBuilder);
656 case Intrinsic::sadd_with_overflow:
657 return translateOverflowIntrinsic(CI, TargetOpcode::G_SADDO, MIRBuilder);
658 case Intrinsic::usub_with_overflow:
659 return translateOverflowIntrinsic(CI, TargetOpcode::G_USUBE, MIRBuilder);
660 case Intrinsic::ssub_with_overflow:
661 return translateOverflowIntrinsic(CI, TargetOpcode::G_SSUBO, MIRBuilder);
662 case Intrinsic::umul_with_overflow:
663 return translateOverflowIntrinsic(CI, TargetOpcode::G_UMULO, MIRBuilder);
664 case Intrinsic::smul_with_overflow:
665 return translateOverflowIntrinsic(CI, TargetOpcode::G_SMULO, MIRBuilder);
667 MIRBuilder.buildInstr(TargetOpcode::G_FPOW)
668 .addDef(getOrCreateVReg(CI))
669 .addUse(getOrCreateVReg(*CI.getArgOperand(0)))
670 .addUse(getOrCreateVReg(*CI.getArgOperand(1)));
672 case Intrinsic::memcpy:
673 case Intrinsic::memmove:
674 case Intrinsic::memset:
675 return translateMemfunc(CI, MIRBuilder, ID);
676 case Intrinsic::eh_typeid_for: {
677 GlobalValue *GV = ExtractTypeInfo(CI.getArgOperand(0));
678 unsigned Reg = getOrCreateVReg(CI);
679 unsigned TypeID = MF->getTypeIDFor(GV);
680 MIRBuilder.buildConstant(Reg, TypeID);
683 case Intrinsic::objectsize: {
684 // If we don't know by now, we're never going to know.
685 const ConstantInt *Min = cast<ConstantInt>(CI.getArgOperand(1));
687 MIRBuilder.buildConstant(getOrCreateVReg(CI), Min->isZero() ? -1ULL : 0);
690 case Intrinsic::stackguard:
691 getStackGuard(getOrCreateVReg(CI), MIRBuilder);
693 case Intrinsic::stackprotector: {
694 LLT PtrTy = getLLTForType(*CI.getArgOperand(0)->getType(), *DL);
695 unsigned GuardVal = MRI->createGenericVirtualRegister(PtrTy);
696 getStackGuard(GuardVal, MIRBuilder);
698 AllocaInst *Slot = cast<AllocaInst>(CI.getArgOperand(1));
699 MIRBuilder.buildStore(
700 GuardVal, getOrCreateVReg(*Slot),
701 *MF->getMachineMemOperand(
702 MachinePointerInfo::getFixedStack(*MF,
703 getOrCreateFrameIndex(*Slot)),
704 MachineMemOperand::MOStore | MachineMemOperand::MOVolatile,
705 PtrTy.getSizeInBits() / 8, 8));
712 bool IRTranslator::translateInlineAsm(const CallInst &CI,
713 MachineIRBuilder &MIRBuilder) {
714 const InlineAsm &IA = cast<InlineAsm>(*CI.getCalledValue());
715 if (!IA.getConstraintString().empty())
718 unsigned ExtraInfo = 0;
719 if (IA.hasSideEffects())
720 ExtraInfo |= InlineAsm::Extra_HasSideEffects;
721 if (IA.getDialect() == InlineAsm::AD_Intel)
722 ExtraInfo |= InlineAsm::Extra_AsmDialect;
724 MIRBuilder.buildInstr(TargetOpcode::INLINEASM)
725 .addExternalSymbol(IA.getAsmString().c_str())
731 bool IRTranslator::translateCall(const User &U, MachineIRBuilder &MIRBuilder) {
732 const CallInst &CI = cast<CallInst>(U);
733 auto TII = MF->getTarget().getIntrinsicInfo();
734 const Function *F = CI.getCalledFunction();
736 if (CI.isInlineAsm())
737 return translateInlineAsm(CI, MIRBuilder);
739 if (!F || !F->isIntrinsic()) {
740 unsigned Res = CI.getType()->isVoidTy() ? 0 : getOrCreateVReg(CI);
741 SmallVector<unsigned, 8> Args;
742 for (auto &Arg: CI.arg_operands())
743 Args.push_back(getOrCreateVReg(*Arg));
745 MF->getFrameInfo().setHasCalls(true);
746 return CLI->lowerCall(MIRBuilder, &CI, Res, Args, [&]() {
747 return getOrCreateVReg(*CI.getCalledValue());
751 Intrinsic::ID ID = F->getIntrinsicID();
752 if (TII && ID == Intrinsic::not_intrinsic)
753 ID = static_cast<Intrinsic::ID>(TII->getIntrinsicID(F));
755 assert(ID != Intrinsic::not_intrinsic && "unknown intrinsic");
757 if (translateKnownIntrinsic(CI, ID, MIRBuilder))
760 unsigned Res = CI.getType()->isVoidTy() ? 0 : getOrCreateVReg(CI);
761 MachineInstrBuilder MIB =
762 MIRBuilder.buildIntrinsic(ID, Res, !CI.doesNotAccessMemory());
764 for (auto &Arg : CI.arg_operands()) {
765 // Some intrinsics take metadata parameters. Reject them.
766 if (isa<MetadataAsValue>(Arg))
768 if (ConstantInt *CI = dyn_cast<ConstantInt>(Arg))
769 MIB.addImm(CI->getSExtValue());
771 MIB.addUse(getOrCreateVReg(*Arg));
776 bool IRTranslator::translateInvoke(const User &U,
777 MachineIRBuilder &MIRBuilder) {
778 const InvokeInst &I = cast<InvokeInst>(U);
779 MCContext &Context = MF->getContext();
781 const BasicBlock *ReturnBB = I.getSuccessor(0);
782 const BasicBlock *EHPadBB = I.getSuccessor(1);
784 const Value *Callee = I.getCalledValue();
785 const Function *Fn = dyn_cast<Function>(Callee);
786 if (isa<InlineAsm>(Callee))
789 // FIXME: support invoking patchpoint and statepoint intrinsics.
790 if (Fn && Fn->isIntrinsic())
793 // FIXME: support whatever these are.
794 if (I.countOperandBundlesOfType(LLVMContext::OB_deopt))
797 // FIXME: support Windows exception handling.
798 if (!isa<LandingPadInst>(EHPadBB->front()))
802 // Emit the actual call, bracketed by EH_LABELs so that the MF knows about
803 // the region covered by the try.
804 MCSymbol *BeginSymbol = Context.createTempSymbol();
805 MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(BeginSymbol);
807 unsigned Res = I.getType()->isVoidTy() ? 0 : getOrCreateVReg(I);
808 SmallVector<unsigned, 8> Args;
809 for (auto &Arg: I.arg_operands())
810 Args.push_back(getOrCreateVReg(*Arg));
812 if (!CLI->lowerCall(MIRBuilder, &I, Res, Args,
813 [&]() { return getOrCreateVReg(*I.getCalledValue()); }))
816 MCSymbol *EndSymbol = Context.createTempSymbol();
817 MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(EndSymbol);
819 // FIXME: track probabilities.
820 MachineBasicBlock &EHPadMBB = getMBB(*EHPadBB),
821 &ReturnMBB = getMBB(*ReturnBB);
822 MF->addInvoke(&EHPadMBB, BeginSymbol, EndSymbol);
823 MIRBuilder.getMBB().addSuccessor(&ReturnMBB);
824 MIRBuilder.getMBB().addSuccessor(&EHPadMBB);
825 MIRBuilder.buildBr(ReturnMBB);
830 bool IRTranslator::translateLandingPad(const User &U,
831 MachineIRBuilder &MIRBuilder) {
832 const LandingPadInst &LP = cast<LandingPadInst>(U);
834 MachineBasicBlock &MBB = MIRBuilder.getMBB();
835 addLandingPadInfo(LP, MBB);
839 // If there aren't registers to copy the values into (e.g., during SjLj
840 // exceptions), then don't bother.
841 auto &TLI = *MF->getSubtarget().getTargetLowering();
842 const Constant *PersonalityFn = MF->getFunction()->getPersonalityFn();
843 if (TLI.getExceptionPointerRegister(PersonalityFn) == 0 &&
844 TLI.getExceptionSelectorRegister(PersonalityFn) == 0)
847 // If landingpad's return type is token type, we don't create DAG nodes
848 // for its exception pointer and selector value. The extraction of exception
849 // pointer or selector value from token type landingpads is not currently
851 if (LP.getType()->isTokenTy())
854 // Add a label to mark the beginning of the landing pad. Deletion of the
855 // landing pad can thus be detected via the MachineModuleInfo.
856 MIRBuilder.buildInstr(TargetOpcode::EH_LABEL)
857 .addSym(MF->addLandingPad(&MBB));
859 LLT Ty = getLLTForType(*LP.getType(), *DL);
860 unsigned Undef = MRI->createGenericVirtualRegister(Ty);
861 MIRBuilder.buildUndef(Undef);
863 SmallVector<LLT, 2> Tys;
864 for (Type *Ty : cast<StructType>(LP.getType())->elements())
865 Tys.push_back(getLLTForType(*Ty, *DL));
866 assert(Tys.size() == 2 && "Only two-valued landingpads are supported");
868 // Mark exception register as live in.
869 unsigned ExceptionReg = TLI.getExceptionPointerRegister(PersonalityFn);
873 MBB.addLiveIn(ExceptionReg);
874 unsigned VReg = MRI->createGenericVirtualRegister(Tys[0]),
875 Tmp = MRI->createGenericVirtualRegister(Ty);
876 MIRBuilder.buildCopy(VReg, ExceptionReg);
877 MIRBuilder.buildInsert(Tmp, Undef, VReg, 0);
879 unsigned SelectorReg = TLI.getExceptionSelectorRegister(PersonalityFn);
883 MBB.addLiveIn(SelectorReg);
885 // N.b. the exception selector register always has pointer type and may not
886 // match the actual IR-level type in the landingpad so an extra cast is
888 unsigned PtrVReg = MRI->createGenericVirtualRegister(Tys[0]);
889 MIRBuilder.buildCopy(PtrVReg, SelectorReg);
891 VReg = MRI->createGenericVirtualRegister(Tys[1]);
892 MIRBuilder.buildInstr(TargetOpcode::G_PTRTOINT).addDef(VReg).addUse(PtrVReg);
893 MIRBuilder.buildInsert(getOrCreateVReg(LP), Tmp, VReg,
894 Tys[0].getSizeInBits());
898 bool IRTranslator::translateAlloca(const User &U,
899 MachineIRBuilder &MIRBuilder) {
900 auto &AI = cast<AllocaInst>(U);
902 if (AI.isStaticAlloca()) {
903 unsigned Res = getOrCreateVReg(AI);
904 int FI = getOrCreateFrameIndex(AI);
905 MIRBuilder.buildFrameIndex(Res, FI);
909 // Now we're in the harder dynamic case.
910 Type *Ty = AI.getAllocatedType();
912 std::max((unsigned)DL->getPrefTypeAlignment(Ty), AI.getAlignment());
914 unsigned NumElts = getOrCreateVReg(*AI.getArraySize());
916 LLT IntPtrTy = LLT::scalar(DL->getPointerSizeInBits());
917 if (MRI->getType(NumElts) != IntPtrTy) {
918 unsigned ExtElts = MRI->createGenericVirtualRegister(IntPtrTy);
919 MIRBuilder.buildZExtOrTrunc(ExtElts, NumElts);
923 unsigned AllocSize = MRI->createGenericVirtualRegister(IntPtrTy);
924 unsigned TySize = MRI->createGenericVirtualRegister(IntPtrTy);
925 MIRBuilder.buildConstant(TySize, -DL->getTypeAllocSize(Ty));
926 MIRBuilder.buildMul(AllocSize, NumElts, TySize);
928 LLT PtrTy = getLLTForType(*AI.getType(), *DL);
929 auto &TLI = *MF->getSubtarget().getTargetLowering();
930 unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
932 unsigned SPTmp = MRI->createGenericVirtualRegister(PtrTy);
933 MIRBuilder.buildCopy(SPTmp, SPReg);
935 unsigned AllocTmp = MRI->createGenericVirtualRegister(PtrTy);
936 MIRBuilder.buildGEP(AllocTmp, SPTmp, AllocSize);
938 // Handle alignment. We have to realign if the allocation granule was smaller
939 // than stack alignment, or the specific alloca requires more than stack
941 unsigned StackAlign =
942 MF->getSubtarget().getFrameLowering()->getStackAlignment();
943 Align = std::max(Align, StackAlign);
944 if (Align > StackAlign || DL->getTypeAllocSize(Ty) % StackAlign != 0) {
945 // Round the size of the allocation up to the stack alignment size
946 // by add SA-1 to the size. This doesn't overflow because we're computing
947 // an address inside an alloca.
948 unsigned AlignedAlloc = MRI->createGenericVirtualRegister(PtrTy);
949 MIRBuilder.buildPtrMask(AlignedAlloc, AllocTmp, Log2_32(Align));
950 AllocTmp = AlignedAlloc;
953 MIRBuilder.buildCopy(SPReg, AllocTmp);
954 MIRBuilder.buildCopy(getOrCreateVReg(AI), AllocTmp);
956 MF->getFrameInfo().CreateVariableSizedObject(Align ? Align : 1, &AI);
957 assert(MF->getFrameInfo().hasVarSizedObjects());
961 bool IRTranslator::translateVAArg(const User &U, MachineIRBuilder &MIRBuilder) {
962 // FIXME: We may need more info about the type. Because of how LLT works,
963 // we're completely discarding the i64/double distinction here (amongst
964 // others). Fortunately the ABIs I know of where that matters don't use va_arg
965 // anyway but that's not guaranteed.
966 MIRBuilder.buildInstr(TargetOpcode::G_VAARG)
967 .addDef(getOrCreateVReg(U))
968 .addUse(getOrCreateVReg(*U.getOperand(0)))
969 .addImm(DL->getABITypeAlignment(U.getType()));
973 bool IRTranslator::translateInsertElement(const User &U,
974 MachineIRBuilder &MIRBuilder) {
975 // If it is a <1 x Ty> vector, use the scalar as it is
976 // not a legal vector type in LLT.
977 if (U.getType()->getVectorNumElements() == 1) {
978 unsigned Elt = getOrCreateVReg(*U.getOperand(1));
982 MIRBuilder.buildInsertVectorElement(
983 getOrCreateVReg(U), getOrCreateVReg(*U.getOperand(0)),
984 getOrCreateVReg(*U.getOperand(1)), getOrCreateVReg(*U.getOperand(2)));
988 bool IRTranslator::translateExtractElement(const User &U,
989 MachineIRBuilder &MIRBuilder) {
990 // If it is a <1 x Ty> vector, use the scalar as it is
991 // not a legal vector type in LLT.
992 if (U.getOperand(0)->getType()->getVectorNumElements() == 1) {
993 unsigned Elt = getOrCreateVReg(*U.getOperand(0));
997 MIRBuilder.buildExtractVectorElement(getOrCreateVReg(U),
998 getOrCreateVReg(*U.getOperand(0)),
999 getOrCreateVReg(*U.getOperand(1)));
1003 bool IRTranslator::translatePHI(const User &U, MachineIRBuilder &MIRBuilder) {
1004 const PHINode &PI = cast<PHINode>(U);
1005 auto MIB = MIRBuilder.buildInstr(TargetOpcode::PHI);
1006 MIB.addDef(getOrCreateVReg(PI));
1008 PendingPHIs.emplace_back(&PI, MIB.getInstr());
1012 void IRTranslator::finishPendingPhis() {
1013 for (std::pair<const PHINode *, MachineInstr *> &Phi : PendingPHIs) {
1014 const PHINode *PI = Phi.first;
1015 MachineInstrBuilder MIB(*MF, Phi.second);
1017 // All MachineBasicBlocks exist, add them to the PHI. We assume IRTranslator
1018 // won't create extra control flow here, otherwise we need to find the
1019 // dominating predecessor here (or perhaps force the weirder IRTranslators
1020 // to provide a simple boundary).
1021 SmallSet<const BasicBlock *, 4> HandledPreds;
1023 for (unsigned i = 0; i < PI->getNumIncomingValues(); ++i) {
1024 auto IRPred = PI->getIncomingBlock(i);
1025 if (HandledPreds.count(IRPred))
1028 HandledPreds.insert(IRPred);
1029 unsigned ValReg = getOrCreateVReg(*PI->getIncomingValue(i));
1030 for (auto Pred : getMachinePredBBs({IRPred, PI->getParent()})) {
1031 assert(Pred->isSuccessor(MIB->getParent()) &&
1032 "incorrect CFG at MachineBasicBlock level");
1040 bool IRTranslator::translate(const Instruction &Inst) {
1041 CurBuilder.setDebugLoc(Inst.getDebugLoc());
1042 switch(Inst.getOpcode()) {
1043 #define HANDLE_INST(NUM, OPCODE, CLASS) \
1044 case Instruction::OPCODE: return translate##OPCODE(Inst, CurBuilder);
1045 #include "llvm/IR/Instruction.def"
1051 bool IRTranslator::translate(const Constant &C, unsigned Reg) {
1052 if (auto CI = dyn_cast<ConstantInt>(&C))
1053 EntryBuilder.buildConstant(Reg, *CI);
1054 else if (auto CF = dyn_cast<ConstantFP>(&C))
1055 EntryBuilder.buildFConstant(Reg, *CF);
1056 else if (isa<UndefValue>(C))
1057 EntryBuilder.buildUndef(Reg);
1058 else if (isa<ConstantPointerNull>(C))
1059 EntryBuilder.buildConstant(Reg, 0);
1060 else if (auto GV = dyn_cast<GlobalValue>(&C))
1061 EntryBuilder.buildGlobalValue(Reg, GV);
1062 else if (auto CAZ = dyn_cast<ConstantAggregateZero>(&C)) {
1063 if (!CAZ->getType()->isVectorTy())
1065 // Return the scalar if it is a <1 x Ty> vector.
1066 if (CAZ->getNumElements() == 1)
1067 return translate(*CAZ->getElementValue(0u), Reg);
1068 std::vector<unsigned> Ops;
1069 for (unsigned i = 0; i < CAZ->getNumElements(); ++i) {
1070 Constant &Elt = *CAZ->getElementValue(i);
1071 Ops.push_back(getOrCreateVReg(Elt));
1073 EntryBuilder.buildMerge(Reg, Ops);
1074 } else if (auto CV = dyn_cast<ConstantDataVector>(&C)) {
1075 // Return the scalar if it is a <1 x Ty> vector.
1076 if (CV->getNumElements() == 1)
1077 return translate(*CV->getElementAsConstant(0), Reg);
1078 std::vector<unsigned> Ops;
1079 for (unsigned i = 0; i < CV->getNumElements(); ++i) {
1080 Constant &Elt = *CV->getElementAsConstant(i);
1081 Ops.push_back(getOrCreateVReg(Elt));
1083 EntryBuilder.buildMerge(Reg, Ops);
1084 } else if (auto CE = dyn_cast<ConstantExpr>(&C)) {
1085 switch(CE->getOpcode()) {
1086 #define HANDLE_INST(NUM, OPCODE, CLASS) \
1087 case Instruction::OPCODE: return translate##OPCODE(*CE, EntryBuilder);
1088 #include "llvm/IR/Instruction.def"
1098 void IRTranslator::finalizeFunction() {
1099 // Release the memory used by the different maps we
1100 // needed during the translation.
1101 PendingPHIs.clear();
1103 FrameIndices.clear();
1104 MachinePreds.clear();
1107 bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
1109 const Function &F = *MF->getFunction();
1112 CLI = MF->getSubtarget().getCallLowering();
1113 CurBuilder.setMF(*MF);
1114 EntryBuilder.setMF(*MF);
1115 MRI = &MF->getRegInfo();
1116 DL = &F.getParent()->getDataLayout();
1117 TPC = &getAnalysis<TargetPassConfig>();
1118 ORE = make_unique<OptimizationRemarkEmitter>(&F);
1120 assert(PendingPHIs.empty() && "stale PHIs");
1122 // Release the per-function state when we return, whether we succeeded or not.
1123 auto FinalizeOnReturn = make_scope_exit([this]() { finalizeFunction(); });
1125 // Setup a separate basic-block for the arguments and constants
1126 MachineBasicBlock *EntryBB = MF->CreateMachineBasicBlock();
1127 MF->push_back(EntryBB);
1128 EntryBuilder.setMBB(*EntryBB);
1130 // Create all blocks, in IR order, to preserve the layout.
1131 for (const BasicBlock &BB: F) {
1132 auto *&MBB = BBToMBB[&BB];
1134 MBB = MF->CreateMachineBasicBlock(&BB);
1137 if (BB.hasAddressTaken())
1138 MBB->setHasAddressTaken();
1141 // Make our arguments/constants entry block fallthrough to the IR entry block.
1142 EntryBB->addSuccessor(&getMBB(F.front()));
1144 // Lower the actual args into this basic block.
1145 SmallVector<unsigned, 8> VRegArgs;
1146 for (const Argument &Arg: F.args())
1147 VRegArgs.push_back(getOrCreateVReg(Arg));
1148 if (!CLI->lowerFormalArguments(EntryBuilder, F, VRegArgs)) {
1149 OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
1150 MF->getFunction()->getSubprogram(),
1151 &MF->getFunction()->getEntryBlock());
1152 R << "unable to lower arguments: " << ore::NV("Prototype", F.getType());
1153 reportTranslationError(*MF, *TPC, *ORE, R);
1157 // And translate the function!
1158 for (const BasicBlock &BB: F) {
1159 MachineBasicBlock &MBB = getMBB(BB);
1160 // Set the insertion point of all the following translations to
1161 // the end of this basic block.
1162 CurBuilder.setMBB(MBB);
1164 for (const Instruction &Inst: BB) {
1165 if (translate(Inst))
1168 std::string InstStrStorage;
1169 raw_string_ostream InstStr(InstStrStorage);
1172 OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
1173 Inst.getDebugLoc(), &BB);
1174 R << "unable to translate instruction: " << ore::NV("Opcode", &Inst)
1175 << ": '" << InstStr.str() << "'";
1176 reportTranslationError(*MF, *TPC, *ORE, R);
1181 finishPendingPhis();
1183 // Now that the MachineFrameInfo has been configured, no further changes to
1184 // the reserved registers are possible.
1185 MRI->freezeReservedRegs(*MF);
1187 // Merge the argument lowering and constants block with its single
1188 // successor, the LLVM-IR entry block. We want the basic block to
1190 assert(EntryBB->succ_size() == 1 &&
1191 "Custom BB used for lowering should have only one successor");
1192 // Get the successor of the current entry block.
1193 MachineBasicBlock &NewEntryBB = **EntryBB->succ_begin();
1194 assert(NewEntryBB.pred_size() == 1 &&
1195 "LLVM-IR entry block has a predecessor!?");
1196 // Move all the instruction from the current entry block to the
1198 NewEntryBB.splice(NewEntryBB.begin(), EntryBB, EntryBB->begin(),
1201 // Update the live-in information for the new entry block.
1202 for (const MachineBasicBlock::RegisterMaskPair &LiveIn : EntryBB->liveins())
1203 NewEntryBB.addLiveIn(LiveIn);
1204 NewEntryBB.sortUniqueLiveIns();
1206 // Get rid of the now empty basic block.
1207 EntryBB->removeSuccessor(&NewEntryBB);
1208 MF->remove(EntryBB);
1209 MF->DeleteMachineBasicBlock(EntryBB);
1211 assert(&MF->front() == &NewEntryBB &&
1212 "New entry wasn't next in the list of basic block!");