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Fix a bug where we would 'promote' an allocation from one type to another 

where the second has less alignment required.  If we had explicit alignment
support in the IR, we could handle this case, but we can't until we do.

llvm-svn: 23960
This commit is contained in:
Chris Lattner 2005-10-24 06:26:18 +00:00
parent ac87beb03a
commit 355ecc09f8
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3795,10 +3795,14 @@ Instruction *InstCombiner::PromoteCastOfAllocation(CastInst &CI,
const Type *AllocElTy = AI.getAllocatedType();
const Type *CastElTy = PTy->getElementType();
if (!AllocElTy->isSized() || !CastElTy->isSized()) return 0;
unsigned AllocElTyAlign = TD->getTypeSize(AllocElTy);
unsigned CastElTyAlign = TD->getTypeSize(CastElTy);
if (CastElTyAlign < AllocElTyAlign) return 0;
uint64_t AllocElTySize = TD->getTypeSize(AllocElTy);
uint64_t CastElTySize = TD->getTypeSize(CastElTy);
// If the allocation is for an even multiple of the cast type size
if (CastElTySize == 0 || AllocElTySize % CastElTySize != 0)
return 0;