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When checking aliases between phi sources and V2, we know the sources are not themselves phi nodes. However, V2 may be. Call aliasCheck with V2 first to potentially eliminate a std::swap call.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84226 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-10-16 00:33:09 +00:00
parent 934f98b536
commit a846a8a1dc
1 changed files with 3 additions and 3 deletions
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6
lib/Analysis/BasicAliasAnalysis.cpp
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@ -222,7 +222,7 @@ namespace {
private:
// VisitedPHIs - Track PHI nodes visited by a aliasCheck() call.
SmallSet<const PHINode*, 16> VisitedPHIs;
SmallPtrSet<const PHINode*, 16> VisitedPHIs;
// aliasGEP - Provide a bunch of ad-hoc rules to disambiguate a GEP instruction
// against another.
@ -533,7 +533,7 @@ BasicAliasAnalysis::aliasPHI(const PHINode *PN, unsigned PNSize,
if (!VisitedPHIs.insert(PN))
return MayAlias;
SmallSet<Value*, 4> UniqueSrc;
SmallPtrSet<Value*, 4> UniqueSrc;
SmallVector<Value*, 4> V1Srcs;
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
Value *PV1 = PN->getIncomingValue(i);
@ -557,7 +557,7 @@ BasicAliasAnalysis::aliasPHI(const PHINode *PN, unsigned PNSize,
// NoAlias / MustAlias. Otherwise, returns MayAlias.
for (unsigned i = 1, e = V1Srcs.size(); i != e; ++i) {
Value *V = V1Srcs[i];
AliasResult ThisAlias = aliasCheck(V, PNSize, V2, V2Size);
AliasResult ThisAlias = aliasCheck(V2, V2Size, V, PNSize);
if (ThisAlias != Alias || ThisAlias == MayAlias)
return MayAlias;
}