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LSR cleanup: potential bug caught by PVS-Studio.

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Thanks Andrey.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-03-26 18:03:16 +00:00
parent f64282145e
commit 81748bc320
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2497,13 +2497,14 @@ void LSRInstance::ChainInstruction(Instruction *UserInst, Instruction *IVOper,
for (Value::use_iterator UseIter = IVOper->use_begin(), for (Value::use_iterator UseIter = IVOper->use_begin(),
UseEnd = IVOper->use_end(); UseIter != UseEnd; ++UseIter) { UseEnd = IVOper->use_end(); UseIter != UseEnd; ++UseIter) {
Instruction *OtherUse = dyn_cast<Instruction>(*UseIter); Instruction *OtherUse = dyn_cast<Instruction>(*UseIter);
if (!OtherUse || OtherUse == UserInst)
continue;
if (SE.isSCEVable(OtherUse->getType()) if (SE.isSCEVable(OtherUse->getType())
&& !isa<SCEVUnknown>(SE.getSCEV(OtherUse)) && !isa<SCEVUnknown>(SE.getSCEV(OtherUse))
&& IU.isIVUserOrOperand(OtherUse)) { && IU.isIVUserOrOperand(OtherUse)) {
continue; continue;
} }
if (OtherUse && OtherUse != UserInst) NearUsers.insert(OtherUse);
NearUsers.insert(OtherUse);
} }
// Since this user is part of the chain, it's no longer considered a use // Since this user is part of the chain, it's no longer considered a use