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Extend the AliasAnalysis::pointsToConstantMemory interface to allow it

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to optionally look for constant or local (alloca) memory.

Teach BasicAliasAnalysis::pointsToConstantMemory to look through Select
and Phi nodes, and to support looking for local memory.

Remove FunctionAttrs' PointsToLocalOrConstantMemory function, now that
AliasAnalysis knows all the tricks that it knew.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118412 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-11-08 16:45:26 +00:00
parent c80cbf2540
commit a25e5dbcc2
9 changed files with 85 additions and 83 deletions
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11
lib/Analysis/TypeBasedAliasAnalysis.cpp
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@ -138,7 +138,7 @@ namespace {
private:
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual AliasResult alias(const Location &LocA, const Location &LocB);
virtual bool pointsToConstantMemory(const Location &Loc);
virtual bool pointsToConstantMemory(const Location &Loc, bool OrLocal);
virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
const Location &Loc);
virtual ModRefResult getModRefInfo(ImmutableCallSite CS1,
@ -225,19 +225,20 @@ TypeBasedAliasAnalysis::alias(const Location &LocA,
return NoAlias;
}
bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc) {
bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc,
bool OrLocal) {
if (!EnableTBAA)
return AliasAnalysis::pointsToConstantMemory(Loc);
return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
const MDNode *M = Loc.TBAATag;
if (!M) return AliasAnalysis::pointsToConstantMemory(Loc);
if (!M) return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
// If this is an "immutable" type, we can assume the pointer is pointing
// to constant memory.
if (TBAANode(M).TypeIsImmutable())
return true;
return AliasAnalysis::pointsToConstantMemory(Loc);
return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
}
AliasAnalysis::ModRefResult