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Eliminate a virtual method call
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18964 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -144,7 +144,10 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
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Function *CF = CI->getCalledFunction();
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if (CF == 0) return; // Indirect call.
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AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
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if (!AA.onlyReadsMemory(CF)) return; // Nothing we can do.
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AliasAnalysis::ModRefBehavior MRB = AA.getModRefBehavior(CF, CI);
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if (MRB != AliasAnalysis::DoesNotAccessMemory &&
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MRB != AliasAnalysis::OnlyReadsMemory)
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return; // Nothing we can do for now.
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// Scan all of the arguments of the function, looking for one that is not
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// global. In particular, we would prefer to have an argument or instruction
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@ -193,7 +196,7 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
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// whether an intervening instruction could modify memory that is read, not
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// ANY memory.
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//
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if (!AA.doesNotAccessMemory(CF)) {
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if (MRB == AliasAnalysis::OnlyReadsMemory) {
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DominatorSet &DomSetInfo = getAnalysis<DominatorSet>();
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BasicBlock *CIBB = CI->getParent();
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for (unsigned i = 0; i != IdenticalCalls.size(); ++i) {
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