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Reduce amount of work we do calculating mustaliases if the arg is a global

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-07-02 04:39:13 +00:00
parent 58f98d0bf0
commit 9cd0484251
1 changed files with 16 additions and 11 deletions
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27
lib/Analysis/DataStructure/DataStructureAA.cpp
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@ -146,17 +146,22 @@ AliasAnalysis::AliasResult DSAA::alias(const Value *V1, unsigned V1Size,
/// specified vector.
///
void DSAA::getMustAliases(Value *P, std::vector<Value*> &RetVals) {
DSGraph *G = getGraphForValue(P);
if (!G) G = &TD->getGlobalsGraph();
// The only must alias information we can currently determine occurs when the
// node for P is a global node with only one entry.
const DSGraph::ScalarMapTy &GSM = G->getScalarMap();
DSGraph::ScalarMapTy::const_iterator I = GSM.find(P);
if (I != GSM.end()) {
DSNode *N = I->second.getNode();
if (isSinglePhysicalObject(N))
RetVals.push_back(N->getGlobals()[0]);
// Currently the only must alias information we can provide is to say that
// something is equal to a global value. If we already have a global value,
// don't get worked up about it.
if (!isa<GlobalValue>(P)) {
DSGraph *G = getGraphForValue(P);
if (!G) G = &TD->getGlobalsGraph();
// The only must alias information we can currently determine occurs when
// the node for P is a global node with only one entry.
const DSGraph::ScalarMapTy &GSM = G->getScalarMap();
DSGraph::ScalarMapTy::const_iterator I = GSM.find(P);
if (I != GSM.end()) {
DSNode *N = I->second.getNode();
if (N->isComplete() && isSinglePhysicalObject(N))
RetVals.push_back(N->getGlobals()[0]);
}
}
return getAnalysis<AliasAnalysis>().getMustAliases(P, RetVals);