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Fix PR1657

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42075 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2007-09-18 01:54:42 +00:00
parent 6e19896999
commit e3bfb88898
2 changed files with 34 additions and 0 deletions
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8
lib/Transforms/Scalar/LICM.cpp
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@ -791,6 +791,14 @@ void LICM::FindPromotableValuesInLoop(
break;
}
// If GEP base is NULL then the calculated address used by Store or
// Load instruction is invalid. Do not promote this value because
// it may expose load and store instruction that are covered by
// condition which may not yet folded.
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(V))
if (isa<ConstantPointerNull>(GEP->getOperand(0)))
PointerOk = false;
if (PointerOk) {
const Type *Ty = cast<PointerType>(V->getType())->getElementType();
AllocaInst *AI = new AllocaInst(Ty, 0, V->getName()+".tmp", FnStart);