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Fix a bug in EvaluateInDifferentType. The type of operand should not be
used to determine whether a ZExt or SExt cast is performed. Instead, pass an "isSigned" bool to the function and determine its value from the opcode of the cast involved. Also, clean up some cruft from previous patches. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32548 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -307,7 +307,7 @@ namespace {
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Instruction *PromoteCastOfAllocation(CastInst &CI, AllocationInst &AI);
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Instruction *MatchBSwap(BinaryOperator &I);
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Value *EvaluateInDifferentType(Value *V, const Type *Ty);
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Value *EvaluateInDifferentType(Value *V, const Type *Ty, bool isSigned);
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};
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RegisterPass<InstCombiner> X("instcombine", "Combine redundant instructions");
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@ -2171,14 +2171,12 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
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// See if we can simplify things based on how the boolean was originally
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// formed.
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CastInst *BoolCast = 0;
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if (CastInst *CI = dyn_cast<CastInst>(I.getOperand(0)))
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if (CI->getOperand(0)->getType() == Type::BoolTy &&
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CI->getOpcode() == Instruction::ZExt)
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if (ZExtInst *CI = dyn_cast<ZExtInst>(I.getOperand(0)))
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if (CI->getOperand(0)->getType() == Type::BoolTy)
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BoolCast = CI;
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if (!BoolCast)
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if (CastInst *CI = dyn_cast<CastInst>(I.getOperand(1)))
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if (CI->getOperand(0)->getType() == Type::BoolTy &&
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CI->getOpcode() == Instruction::ZExt)
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if (ZExtInst *CI = dyn_cast<ZExtInst>(I.getOperand(1)))
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if (CI->getOperand(0)->getType() == Type::BoolTy)
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BoolCast = CI;
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if (BoolCast) {
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if (SetCondInst *SCI = dyn_cast<SetCondInst>(BoolCast->getOperand(0))) {
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@ -4333,8 +4331,7 @@ Instruction *InstCombiner::visitSetCondInst(SetCondInst &I) {
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// Check to see if there is a noop-cast between the shift and the and.
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if (!Shift) {
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if (CastInst *CI = dyn_cast<CastInst>(LHSI->getOperand(0)))
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if (CI->getOpcode() == Instruction::BitCast &&
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CI->getType()->isIntegral())
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if (CI->getOpcode() == Instruction::BitCast)
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Shift = dyn_cast<ShiftInst>(CI->getOperand(0));
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}
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@ -5375,10 +5372,8 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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Amt = Op0->getType()->getPrimitiveSizeInBits();
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Value *Op = ShiftOp->getOperand(0);
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if (isShiftOfSignedShift != isSignedShift)
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Op = InsertNewInstBefore(new BitCastInst(Op, I.getType(), "tmp"), I);
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ShiftInst *ShiftResult = new ShiftInst(I.getOpcode(), Op,
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ConstantInt::get(Type::UByteTy, Amt));
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ConstantInt::get(Type::UByteTy, Amt));
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if (I.getType() == ShiftResult->getType())
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return ShiftResult;
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InsertNewInstBefore(ShiftResult, I);
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@ -5658,9 +5653,10 @@ static bool CanEvaluateInDifferentType(Value *V, const Type *Ty,
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/// EvaluateInDifferentType - Given an expression that
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/// CanEvaluateInDifferentType returns true for, actually insert the code to
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/// evaluate the expression.
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Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty) {
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Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty,
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bool isSigned ) {
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if (Constant *C = dyn_cast<Constant>(V))
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return ConstantExpr::getIntegerCast(C, Ty, C->getType()->isSigned());
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return ConstantExpr::getIntegerCast(C, Ty, isSigned /*Sext or ZExt*/);
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// Otherwise, it must be an instruction.
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Instruction *I = cast<Instruction>(V);
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@ -5669,8 +5665,8 @@ Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty) {
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor: {
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Value *LHS = EvaluateInDifferentType(I->getOperand(0), Ty);
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Value *RHS = EvaluateInDifferentType(I->getOperand(1), Ty);
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Value *LHS = EvaluateInDifferentType(I->getOperand(0), Ty, isSigned);
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Value *RHS = EvaluateInDifferentType(I->getOperand(1), Ty, isSigned);
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Res = BinaryOperator::create((Instruction::BinaryOps)I->getOpcode(),
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LHS, RHS, I->getName());
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break;
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@ -5678,7 +5674,7 @@ Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty) {
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case Instruction::AShr:
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case Instruction::LShr:
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case Instruction::Shl: {
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Value *LHS = EvaluateInDifferentType(I->getOperand(0), Ty);
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Value *LHS = EvaluateInDifferentType(I->getOperand(0), Ty, isSigned);
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Res = new ShiftInst((Instruction::OtherOps)I->getOpcode(), LHS,
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I->getOperand(1), I->getName());
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break;
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@ -5824,7 +5820,8 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
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}
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if (DoXForm) {
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Value *Res = EvaluateInDifferentType(SrcI, DestTy);
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Value *Res = EvaluateInDifferentType(SrcI, DestTy,
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CI.getOpcode() == Instruction::SExt);
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assert(Res->getType() == DestTy);
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switch (CI.getOpcode()) {
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default: assert(0 && "Unknown cast type!");
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@ -7920,11 +7917,11 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
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Value *NewCast;
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Instruction::CastOps opcode = Instruction::BitCast;
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Value *SIOp0 = SI.getOperand(0);
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if (SrcPTy->getTypeID() == Type::PointerTyID) {
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if (isa<PointerType>(SrcPTy)) {
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if (SIOp0->getType()->isIntegral())
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opcode = Instruction::IntToPtr;
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} else if (SrcPTy->isIntegral()) {
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if (SIOp0->getType()->getTypeID() == Type::PointerTyID)
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if (isa<PointerType>(SIOp0->getType()))
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opcode = Instruction::PtrToInt;
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}
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if (Constant *C = dyn_cast<Constant>(SIOp0))
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