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Make ScalarEvolutionAliasAnalysis slightly more aggressive, by making an
underlying alias call even for non-identified-object values. llvm-svn: 85656
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25091aa227
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@ -38,7 +38,7 @@ namespace {
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virtual AliasResult alias(const Value *V1, unsigned V1Size,
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virtual AliasResult alias(const Value *V1, unsigned V1Size,
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const Value *V2, unsigned V2Size);
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const Value *V2, unsigned V2Size);
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Value *GetUnderlyingIdentifiedObject(const SCEV *S);
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Value *GetBaseValue(const SCEV *S);
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};
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};
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} // End of anonymous namespace
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} // End of anonymous namespace
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@ -68,25 +68,22 @@ ScalarEvolutionAliasAnalysis::runOnFunction(Function &F) {
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return false;
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return false;
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}
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}
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/// GetUnderlyingIdentifiedObject - Given an expression, try to find an
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/// GetBaseValue - Given an expression, try to find a
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/// "identified object" (see AliasAnalysis::isIdentifiedObject) base
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/// base value. Return null is none was found.
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/// value. Return null is none was found.
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Value *
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Value *
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ScalarEvolutionAliasAnalysis::GetUnderlyingIdentifiedObject(const SCEV *S) {
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ScalarEvolutionAliasAnalysis::GetBaseValue(const SCEV *S) {
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if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
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if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
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// In an addrec, assume that the base will be in the start, rather
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// In an addrec, assume that the base will be in the start, rather
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// than the step.
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// than the step.
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return GetUnderlyingIdentifiedObject(AR->getStart());
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return GetBaseValue(AR->getStart());
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} else if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {
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} else if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {
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// If there's a pointer operand, it'll be sorted at the end of the list.
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// If there's a pointer operand, it'll be sorted at the end of the list.
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const SCEV *Last = A->getOperand(A->getNumOperands()-1);
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const SCEV *Last = A->getOperand(A->getNumOperands()-1);
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if (isa<PointerType>(Last->getType()))
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if (isa<PointerType>(Last->getType()))
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return GetUnderlyingIdentifiedObject(Last);
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return GetBaseValue(Last);
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} else if (const SCEVUnknown *U = dyn_cast<SCEVUnknown>(S)) {
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} else if (const SCEVUnknown *U = dyn_cast<SCEVUnknown>(S)) {
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// Determine if we've found an Identified object.
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// This is a leaf node.
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Value *V = U->getValue();
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return U->getValue();
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if (isIdentifiedObject(V))
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return V;
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}
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}
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// No Identified object found.
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// No Identified object found.
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return 0;
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return 0;
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@ -120,8 +117,8 @@ ScalarEvolutionAliasAnalysis::alias(const Value *A, unsigned ASize,
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// If ScalarEvolution can find an underlying object, form a new query.
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// If ScalarEvolution can find an underlying object, form a new query.
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// The correctness of this depends on ScalarEvolution not recognizing
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// The correctness of this depends on ScalarEvolution not recognizing
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// inttoptr and ptrtoint operators.
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// inttoptr and ptrtoint operators.
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Value *AO = GetUnderlyingIdentifiedObject(AS);
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Value *AO = GetBaseValue(AS);
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Value *BO = GetUnderlyingIdentifiedObject(BS);
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Value *BO = GetBaseValue(BS);
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if ((AO && AO != A) || (BO && BO != B))
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if ((AO && AO != A) || (BO && BO != B))
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if (alias(AO ? AO : A, AO ? ~0u : ASize,
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if (alias(AO ? AO : A, AO ? ~0u : ASize,
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BO ? BO : B, BO ? ~0u : BSize) == NoAlias)
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BO ? BO : B, BO ? ~0u : BSize) == NoAlias)
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