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Don't assume that two identical instructions that read from memory

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will always return the same value. This isn't currently necessary,
since this code doesn't currently ever get called under circumstances
where it would matter, but it may some day.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80017 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-25 17:56:57 +00:00
parent a123239a5f
commit 041de42d42
1 changed files with 1 additions and 1 deletions
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2
lib/Analysis/ScalarEvolution.cpp
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@ -4349,7 +4349,7 @@ static bool HasSameValue(const SCEV *A, const SCEV *B) {
if (const SCEVUnknown *BU = dyn_cast<SCEVUnknown>(B)) if (const SCEVUnknown *BU = dyn_cast<SCEVUnknown>(B))
if (const Instruction *AI = dyn_cast<Instruction>(AU->getValue())) if (const Instruction *AI = dyn_cast<Instruction>(AU->getValue()))
if (const Instruction *BI = dyn_cast<Instruction>(BU->getValue())) if (const Instruction *BI = dyn_cast<Instruction>(BU->getValue()))
if (AI->isIdenticalTo(BI)) if (AI->isIdenticalTo(BI) && !AI->mayReadFromMemory())
return true; return true;
// Otherwise assume they may have a different value. // Otherwise assume they may have a different value.