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

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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-10-24 06:26:18 +00:00
parent b53c2382a9
commit 18e78bb09e
1 changed files with 6 additions and 2 deletions
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8
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;