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Revise the store V, (cast P) -> store (cast V) -> P transform.

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We only want to do this if the src and destination types have the same
bit width. This patch uses TargetData::getTypeSizeInBits() instead of
making a special case for integer types and avoiding the transform if
they don't match.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33414 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-01-20 23:35:48 +00:00
parent 7c29243670
commit 67f827ce5b
1 changed files with 4 additions and 9 deletions
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13
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8192,10 +8192,9 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
SrcPTy = SrcTy->getElementType();
}
if (((SrcPTy->isInteger() && SrcPTy != Type::Int1Ty) ||
isa<PointerType>(SrcPTy)) &&
IC.getTargetData().getTypeSize(SrcPTy) ==
IC.getTargetData().getTypeSize(DestPTy)) {
if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy)) &&
IC.getTargetData().getTypeSizeInBits(SrcPTy) ==
IC.getTargetData().getTypeSizeInBits(DestPTy)) {
// Okay, we are casting from one integer or pointer type to another of
// the same size. Instead of casting the pointer before
@ -8208,13 +8207,9 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
if (isa<PointerType>(CastDstTy)) {
if (CastSrcTy->isInteger())
opcode = Instruction::IntToPtr;
} else if (const IntegerType* DITy = dyn_cast<IntegerType>(CastDstTy)) {
} else if (isa<IntegerType>(CastDstTy)) {
if (isa<PointerType>(SIOp0->getType()))
opcode = Instruction::PtrToInt;
else if (const IntegerType* SITy = dyn_cast<IntegerType>(CastSrcTy))
if (SITy->getBitWidth() != DITy->getBitWidth())
return 0; // Don't do this transform on unequal bit widths.
// else, BitCast is fine
}
if (Constant *C = dyn_cast<Constant>(SIOp0))
NewCast = ConstantExpr::getCast(opcode, C, CastDstTy);