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Improve mod/ref information based on the pointsToConstantMemory method.

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llvm-svn: 11021
This commit is contained in:
Chris Lattner 2004-01-30 22:16:42 +00:00
parent bb4d6f00f9
commit 71d05cef5e
1 changed files with 9 additions and 2 deletions
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11
lib/Analysis/AliasAnalysis.cpp
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@ -44,8 +44,15 @@ AliasAnalysis::getModRefInfo(LoadInst *L, Value *P, unsigned Size) {
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(StoreInst *S, Value *P, unsigned Size) {
return alias(S->getOperand(1), TD->getTypeSize(S->getOperand(0)->getType()),
P, Size) ? Mod : NoModRef;
// If the stored address cannot alias the pointer in question, then the
// pointer cannot be modified by the store.
if (!alias(S->getOperand(1), TD->getTypeSize(S->getOperand(0)->getType()),
P, Size))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been
// modified by this store.
return pointsToConstantMemory(P) ? NoModRef : Mod;
}