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Eliminate a virtual method call

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llvm-svn: 18964
This commit is contained in:
Chris Lattner 2004-12-15 18:14:04 +00:00
parent 7b834c3f16
commit be18a7e20a
1 changed files with 5 additions and 2 deletions
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7
lib/Analysis/LoadValueNumbering.cpp
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@ -144,7 +144,10 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
Function *CF = CI->getCalledFunction();
if (CF == 0) return; // Indirect call.
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
if (!AA.onlyReadsMemory(CF)) return; // Nothing we can do.
AliasAnalysis::ModRefBehavior MRB = AA.getModRefBehavior(CF, CI);
if (MRB != AliasAnalysis::DoesNotAccessMemory &&
MRB != AliasAnalysis::OnlyReadsMemory)
return; // Nothing we can do for now.
// Scan all of the arguments of the function, looking for one that is not
// global. In particular, we would prefer to have an argument or instruction
@ -193,7 +196,7 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
// whether an intervening instruction could modify memory that is read, not
// ANY memory.
//
if (!AA.doesNotAccessMemory(CF)) {
if (MRB == AliasAnalysis::OnlyReadsMemory) {
DominatorSet &DomSetInfo = getAnalysis<DominatorSet>();
BasicBlock *CIBB = CI->getParent();
for (unsigned i = 0; i != IdenticalCalls.size(); ++i) {