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Implement getModRefBehavior for TypeBasedAliasAnalysis.

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llvm-svn: 118416
This commit is contained in:
Dan Gohman 2010-11-08 17:10:22 +00:00
parent c43f11132e
commit 46cb7cd7d8
1 changed files with 23 additions and 0 deletions
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23
lib/Analysis/TypeBasedAliasAnalysis.cpp
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@ -139,6 +139,8 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual AliasResult alias(const Location &LocA, const Location &LocB);
virtual bool pointsToConstantMemory(const Location &Loc, bool OrLocal);
virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS);
virtual ModRefBehavior getModRefBehavior(const Function *F);
virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
const Location &Loc);
virtual ModRefResult getModRefInfo(ImmutableCallSite CS1,
@ -241,6 +243,27 @@ bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc,
return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
}
AliasAnalysis::ModRefBehavior
TypeBasedAliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
if (!EnableTBAA)
return AliasAnalysis::getModRefBehavior(CS);
ModRefBehavior Min = UnknownModRefBehavior;
// If this is an "immutable" type, we can assume the call doesn't write
// to memory.
if (const MDNode *M = CS.getInstruction()->getMetadata(LLVMContext::MD_tbaa))
if (TBAANode(M).TypeIsImmutable())
Min = OnlyReadsMemory;
return std::min(AliasAnalysis::getModRefBehavior(CS), Min);
}
AliasAnalysis::ModRefBehavior
TypeBasedAliasAnalysis::getModRefBehavior(const Function *F) {
return AliasAnalysis::getModRefBehavior(F);
}
AliasAnalysis::ModRefResult
TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS,
const Location &Loc) {