}
char CodeGenPrepare::ID = 0;
-static void *initializeCodeGenPreparePassOnce(PassRegistry &Registry) {
- initializeTargetLibraryInfoPass(Registry);
- PassInfo *PI = new PassInfo(
- "Optimize for code generation", "codegenprepare", &CodeGenPrepare::ID,
- PassInfo::NormalCtor_t(callDefaultCtor<CodeGenPrepare>), false, false,
- PassInfo::TargetMachineCtor_t(callTargetMachineCtor<CodeGenPrepare>));
- Registry.registerPass(*PI, true);
- return PI;
-}
-
-void llvm::initializeCodeGenPreparePass(PassRegistry &Registry) {
- CALL_ONCE_INITIALIZATION(initializeCodeGenPreparePassOnce)
-}
+INITIALIZE_TM_PASS(CodeGenPrepare, "codegenprepare",
+ "Optimize for code generation", false, false)
FunctionPass *llvm::createCodeGenPreparePass(const TargetMachine *TM) {
return new CodeGenPrepare(TM);
PromotedInsts.clear();
ModifiedDT = false;
- if (TM) TLI = TM->getTargetLowering();
+ if (TM)
+ TLI = TM->getSubtargetImpl()->getTargetLowering();
TLInfo = &getAnalysis<TargetLibraryInfo>();
DominatorTreeWrapperPass *DTWP =
getAnalysisIfAvailable<DominatorTreeWrapperPass>();
if (!ISDOpcode)
continue;
- // If the use is actually a legal node, there will not be an implicit
- // truncate.
+ // If the use is actually a legal node, there will not be an
+ // implicit truncate.
+ // FIXME: always querying the result type is just an
+ // approximation; some nodes' legality is determined by the
+ // operand or other means. There's no good way to find out though.
if (TLI.isOperationLegalOrCustom(ISDOpcode,
- EVT::getEVT(TruncUser->getType())))
+ EVT::getEVT(TruncUser->getType(), true)))
continue;
// Don't bother for PHI nodes.
NeedPlus = true;
}
- if (BaseOffs)
- OS << (NeedPlus ? " + " : "") << BaseOffs, NeedPlus = true;
+ if (BaseOffs) {
+ OS << (NeedPlus ? " + " : "")
+ << BaseOffs;
+ NeedPlus = true;
+ }
if (BaseReg) {
OS << (NeedPlus ? " + " : "")
/// \brief Build a truncate instruction.
class TruncBuilder : public TypePromotionAction {
+ Value *Val;
public:
/// \brief Build a truncate instruction of \p Opnd producing a \p Ty
/// result.
/// trunc Opnd to Ty.
TruncBuilder(Instruction *Opnd, Type *Ty) : TypePromotionAction(Opnd) {
IRBuilder<> Builder(Opnd);
- Inst = cast<Instruction>(Builder.CreateTrunc(Opnd, Ty, "promoted"));
- DEBUG(dbgs() << "Do: TruncBuilder: " << *Inst << "\n");
+ Val = Builder.CreateTrunc(Opnd, Ty, "promoted");
+ DEBUG(dbgs() << "Do: TruncBuilder: " << *Val << "\n");
}
- /// \brief Get the built instruction.
- Instruction *getBuiltInstruction() { return Inst; }
+ /// \brief Get the built value.
+ Value *getBuiltValue() { return Val; }
/// \brief Remove the built instruction.
void undo() override {
- DEBUG(dbgs() << "Undo: TruncBuilder: " << *Inst << "\n");
- Inst->eraseFromParent();
+ DEBUG(dbgs() << "Undo: TruncBuilder: " << *Val << "\n");
+ if (Instruction *IVal = dyn_cast<Instruction>(Val))
+ IVal->eraseFromParent();
}
};
/// \brief Build a sign extension instruction.
class SExtBuilder : public TypePromotionAction {
+ Value *Val;
public:
/// \brief Build a sign extension instruction of \p Opnd producing a \p Ty
/// result.
/// sext Opnd to Ty.
SExtBuilder(Instruction *InsertPt, Value *Opnd, Type *Ty)
- : TypePromotionAction(Inst) {
+ : TypePromotionAction(InsertPt) {
IRBuilder<> Builder(InsertPt);
- Inst = cast<Instruction>(Builder.CreateSExt(Opnd, Ty, "promoted"));
- DEBUG(dbgs() << "Do: SExtBuilder: " << *Inst << "\n");
+ Val = Builder.CreateSExt(Opnd, Ty, "promoted");
+ DEBUG(dbgs() << "Do: SExtBuilder: " << *Val << "\n");
}
- /// \brief Get the built instruction.
- Instruction *getBuiltInstruction() { return Inst; }
+ /// \brief Get the built value.
+ Value *getBuiltValue() { return Val; }
/// \brief Remove the built instruction.
void undo() override {
- DEBUG(dbgs() << "Undo: SExtBuilder: " << *Inst << "\n");
- Inst->eraseFromParent();
+ DEBUG(dbgs() << "Undo: SExtBuilder: " << *Val << "\n");
+ if (Instruction *IVal = dyn_cast<Instruction>(Val))
+ IVal->eraseFromParent();
+ }
+ };
+
+ /// \brief Build a zero extension instruction.
+ class ZExtBuilder : public TypePromotionAction {
+ Value *Val;
+ public:
+ /// \brief Build a zero extension instruction of \p Opnd producing a \p Ty
+ /// result.
+ /// zext Opnd to Ty.
+ ZExtBuilder(Instruction *InsertPt, Value *Opnd, Type *Ty)
+ : TypePromotionAction(InsertPt) {
+ IRBuilder<> Builder(InsertPt);
+ Val = Builder.CreateZExt(Opnd, Ty, "promoted");
+ DEBUG(dbgs() << "Do: ZExtBuilder: " << *Val << "\n");
+ }
+
+ /// \brief Get the built value.
+ Value *getBuiltValue() { return Val; }
+
+ /// \brief Remove the built instruction.
+ void undo() override {
+ DEBUG(dbgs() << "Undo: ZExtBuilder: " << *Val << "\n");
+ if (Instruction *IVal = dyn_cast<Instruction>(Val))
+ IVal->eraseFromParent();
}
};
/// Same as Value::mutateType.
void mutateType(Instruction *Inst, Type *NewTy);
/// Same as IRBuilder::createTrunc.
- Instruction *createTrunc(Instruction *Opnd, Type *Ty);
+ Value *createTrunc(Instruction *Opnd, Type *Ty);
/// Same as IRBuilder::createSExt.
- Instruction *createSExt(Instruction *Inst, Value *Opnd, Type *Ty);
+ Value *createSExt(Instruction *Inst, Value *Opnd, Type *Ty);
+ /// Same as IRBuilder::createZExt.
+ Value *createZExt(Instruction *Inst, Value *Opnd, Type *Ty);
/// Same as Instruction::moveBefore.
void moveBefore(Instruction *Inst, Instruction *Before);
/// @}
Actions.push_back(make_unique<TypePromotionTransaction::TypeMutator>(Inst, NewTy));
}
-Instruction *TypePromotionTransaction::createTrunc(Instruction *Opnd,
- Type *Ty) {
+Value *TypePromotionTransaction::createTrunc(Instruction *Opnd,
+ Type *Ty) {
std::unique_ptr<TruncBuilder> Ptr(new TruncBuilder(Opnd, Ty));
- Instruction *I = Ptr->getBuiltInstruction();
+ Value *Val = Ptr->getBuiltValue();
Actions.push_back(std::move(Ptr));
- return I;
+ return Val;
}
-Instruction *TypePromotionTransaction::createSExt(Instruction *Inst,
- Value *Opnd, Type *Ty) {
+Value *TypePromotionTransaction::createSExt(Instruction *Inst,
+ Value *Opnd, Type *Ty) {
std::unique_ptr<SExtBuilder> Ptr(new SExtBuilder(Inst, Opnd, Ty));
- Instruction *I = Ptr->getBuiltInstruction();
+ Value *Val = Ptr->getBuiltValue();
Actions.push_back(std::move(Ptr));
- return I;
+ return Val;
+}
+
+Value *TypePromotionTransaction::createZExt(Instruction *Inst,
+ Value *Opnd, Type *Ty) {
+ std::unique_ptr<ZExtBuilder> Ptr(new ZExtBuilder(Inst, Opnd, Ty));
+ Value *Val = Ptr->getBuiltValue();
+ Actions.push_back(std::move(Ptr));
+ return Val;
}
void TypePromotionTransaction::moveBefore(Instruction *Inst,
}
/// \brief Utility function to promote the operand of \p SExt when this
- /// operand is a promotable trunc or sext.
+ /// operand is a promotable trunc or sext or zext.
/// \p PromotedInsts maps the instructions to their type before promotion.
/// \p CreatedInsts[out] contains how many non-free instructions have been
/// created to promote the operand of SExt.
/// Should never be called directly.
/// \return The promoted value which is used instead of SExt.
- static Value *promoteOperandForTruncAndSExt(Instruction *SExt,
- TypePromotionTransaction &TPT,
- InstrToOrigTy &PromotedInsts,
- unsigned &CreatedInsts);
+ static Value *promoteOperandForTruncAndAnyExt(Instruction *SExt,
+ TypePromotionTransaction &TPT,
+ InstrToOrigTy &PromotedInsts,
+ unsigned &CreatedInsts);
/// \brief Utility function to promote the operand of \p SExt when this
/// operand is promotable and is not a supported trunc or sext.
bool TypePromotionHelper::canGetThrough(const Instruction *Inst,
Type *ConsideredSExtType,
const InstrToOrigTy &PromotedInsts) {
- // We can always get through sext.
- if (isa<SExtInst>(Inst))
+ // We can always get through sext or zext.
+ if (isa<SExtInst>(Inst) || isa<ZExtInst>(Inst))
return true;
// We can get through binary operator, if it is legal. In other words, the
// SExt or Trunc instructions.
// Return the related handler.
- if (isa<SExtInst>(SExtOpnd) || isa<TruncInst>(SExtOpnd))
- return promoteOperandForTruncAndSExt;
+ if (isa<SExtInst>(SExtOpnd) || isa<TruncInst>(SExtOpnd) ||
+ isa<ZExtInst>(SExtOpnd))
+ return promoteOperandForTruncAndAnyExt;
// Regular instruction.
// Abort early if we will have to insert non-free instructions.
return promoteOperandForOther;
}
-Value *TypePromotionHelper::promoteOperandForTruncAndSExt(
+Value *TypePromotionHelper::promoteOperandForTruncAndAnyExt(
llvm::Instruction *SExt, TypePromotionTransaction &TPT,
InstrToOrigTy &PromotedInsts, unsigned &CreatedInsts) {
// By construction, the operand of SExt is an instruction. Otherwise we cannot
// get through it and this method should not be called.
Instruction *SExtOpnd = cast<Instruction>(SExt->getOperand(0));
- // Replace sext(trunc(opnd)) or sext(sext(opnd))
- // => sext(opnd).
- TPT.setOperand(SExt, 0, SExtOpnd->getOperand(0));
+ Value *ExtVal = SExt;
+ if (isa<ZExtInst>(SExtOpnd)) {
+ // Replace sext(zext(opnd))
+ // => zext(opnd).
+ Value *ZExt =
+ TPT.createZExt(SExt, SExtOpnd->getOperand(0), SExt->getType());
+ TPT.replaceAllUsesWith(SExt, ZExt);
+ TPT.eraseInstruction(SExt);
+ ExtVal = ZExt;
+ } else {
+ // Replace sext(trunc(opnd)) or sext(sext(opnd))
+ // => sext(opnd).
+ TPT.setOperand(SExt, 0, SExtOpnd->getOperand(0));
+ }
CreatedInsts = 0;
// Remove dead code.
if (SExtOpnd->use_empty())
TPT.eraseInstruction(SExtOpnd);
- // Check if the sext is still needed.
- if (SExt->getType() != SExt->getOperand(0)->getType())
- return SExt;
+ // Check if the extension is still needed.
+ Instruction *ExtInst = dyn_cast<Instruction>(ExtVal);
+ if (!ExtInst || ExtInst->getType() != ExtInst->getOperand(0)->getType())
+ return ExtVal;
- // At this point we have: sext ty opnd to ty.
- // Reassign the uses of SExt to the opnd and remove SExt.
- Value *NextVal = SExt->getOperand(0);
- TPT.eraseInstruction(SExt, NextVal);
+ // At this point we have: ext ty opnd to ty.
+ // Reassign the uses of ExtInst to the opnd and remove ExtInst.
+ Value *NextVal = ExtInst->getOperand(0);
+ TPT.eraseInstruction(ExtInst, NextVal);
return NextVal;
}
// All its uses, but SExt, will need to use a truncated value of the
// promoted version.
// Create the truncate now.
- Instruction *Trunc = TPT.createTrunc(SExt, SExtOpnd->getType());
- Trunc->removeFromParent();
- // Insert it just after the definition.
- Trunc->insertAfter(SExtOpnd);
+ Value *Trunc = TPT.createTrunc(SExt, SExtOpnd->getType());
+ if (Instruction *ITrunc = dyn_cast<Instruction>(Trunc)) {
+ ITrunc->removeFromParent();
+ // Insert it just after the definition.
+ ITrunc->insertAfter(SExtOpnd);
+ }
TPT.replaceAllUsesWith(SExtOpnd, Trunc);
// Restore the operand of SExt (which has been replace by the previous call
if (!SExtForOpnd) {
// If yes, create a new one.
DEBUG(dbgs() << "More operands to sext\n");
- SExtForOpnd = TPT.createSExt(SExt, Opnd, SExt->getType());
+ SExtForOpnd =
+ cast<Instruction>(TPT.createSExt(SExt, Opnd, SExt->getType()));
++CreatedInsts;
}
case Instruction::Shl: {
// Can only handle X*C and X << C.
ConstantInt *RHS = dyn_cast<ConstantInt>(AddrInst->getOperand(1));
- if (!RHS) return false;
+ if (!RHS)
+ return false;
int64_t Scale = RHS->getSExtValue();
if (Opcode == Instruction::Shl)
Scale = 1LL << Scale;
return true;
}
case Instruction::SExt: {
+ Instruction *SExt = dyn_cast<Instruction>(AddrInst);
+ if (!SExt)
+ return false;
+
// Try to move this sext out of the way of the addressing mode.
- Instruction *SExt = cast<Instruction>(AddrInst);
// Ask for a method for doing so.
TypePromotionHelper::Action TPH = TypePromotionHelper::getAction(
SExt, InsertedTruncs, TLI, PromotedInsts);
/// Add the ultimately found memory instructions to MemoryUses.
static bool FindAllMemoryUses(Instruction *I,
SmallVectorImpl<std::pair<Instruction*,unsigned> > &MemoryUses,
- SmallPtrSet<Instruction*, 16> &ConsideredInsts,
+ SmallPtrSetImpl<Instruction*> &ConsideredInsts,
const TargetLowering &TLI) {
// If we already considered this instruction, we're done.
if (!ConsideredInsts.insert(I))
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