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VNCoercion: Safely handle targets where pointers are larger than the largest legal integers. #118584

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VNCoercion: Safely handle targets where pointers are larger than the largest legal integers. #118584

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5 changes: 5 additions & 0 deletions llvm/lib/Transforms/Utils/VNCoercion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,11 @@ int analyzeLoadFromClobberingMemInst(Type *LoadTy, Value *LoadPtr,
ConstantInt *SizeCst = dyn_cast<ConstantInt>(MI->getLength());
if (!SizeCst)
return -1;
// If this is a pointer type that's larger than the largest integer that we
// support, then ignore it.
if (LoadTy->isPointerTy() &&
DL.getTypeSizeInBits(LoadTy) > DL.getLargestLegalIntTypeSizeInBits())
return -1;
uint64_t MemSizeInBits = SizeCst->getZExtValue() * 8;

// If this is memset, we just need to see if the offset is valid in the size
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