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Undo the last patch until 253.perlbmk passes with these changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-11-28 20:23:51 +00:00
parent ead1b801e2
commit d4d9ab80b7
1 changed files with 46 additions and 3 deletions
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49
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -5739,6 +5739,13 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
// FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
// because codegen cannot accurately perform a truncate to bool operation.
// Something goes wrong in promotion to a larger type. When CodeGen can
// handle a proper truncation to bool, this should be removed.
if (DestTy == Type::BoolTy)
return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
// See if we can simplify any instructions used by the LHS whose sole
// purpose is to compute bits we don't care about.
uint64_t KnownZero = 0, KnownOne = 0;
@ -6014,11 +6021,35 @@ Instruction *InstCombiner::visitFPExt(CastInst &CI) {
}
Instruction *InstCombiner::visitFPToUI(CastInst &CI) {
return commonCastTransforms(CI);
if (Instruction *I = commonCastTransforms(CI))
return I;
// FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
// because codegen cannot accurately perform a truncate to bool operation.
// Something goes wrong in promotion to a larger type. When CodeGen can
// handle a proper truncation to bool, this should be removed.
Value *Src = CI.getOperand(0);
const Type *SrcTy = Src->getType();
const Type *DestTy = CI.getType();
if (DestTy == Type::BoolTy)
return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
return 0;
}
Instruction *InstCombiner::visitFPToSI(CastInst &CI) {
return commonCastTransforms(CI);
if (Instruction *I = commonCastTransforms(CI))
return I;
// FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
// because codegen cannot accurately perform a truncate to bool operation.
// Something goes wrong in promotion to a larger type. When CodeGen can
// handle a proper truncation to bool, this should be removed.
Value *Src = CI.getOperand(0);
const Type *SrcTy = Src->getType();
const Type *DestTy = CI.getType();
if (DestTy == Type::BoolTy)
return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
return 0;
}
Instruction *InstCombiner::visitUIToFP(CastInst &CI) {
@ -6030,7 +6061,19 @@ Instruction *InstCombiner::visitSIToFP(CastInst &CI) {
}
Instruction *InstCombiner::visitPtrToInt(CastInst &CI) {
return commonCastTransforms(CI);
if (Instruction *I = commonCastTransforms(CI))
return I;
// FIXME. We currently implement cast-to-bool as a setne %X, 0. This is
// because codegen cannot accurately perform a truncate to bool operation.
// Something goes wrong in promotion to a larger type. When CodeGen can
// handle a proper truncation to bool, this should be removed.
Value *Src = CI.getOperand(0);
const Type *SrcTy = Src->getType();
const Type *DestTy = CI.getType();
if (DestTy == Type::BoolTy)
return BinaryOperator::createSetNE(Src, Constant::getNullValue(SrcTy));
return 0;
}
Instruction *InstCombiner::visitIntToPtr(CastInst &CI) {