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Handle constants in phi nodes properly. This fixes test/Transforms/GVNPRE/2007-06-18-ConstantInPhi.ll
llvm-svn: 37655
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@ -927,7 +927,16 @@ bool GVNPRE::runOnFunction(Function &F) {
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for (std::set<Value*>::iterator I = S.begin(), E = S.end();
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I != E; ++I) {
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if (find_leader(anticIn, VN.lookup(*I)) == 0)
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// For non-opaque values, we should already have a value numbering.
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// However, for opaques, such as constants within PHI nodes, it is
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// possible that they have not yet received a number. Make sure they do
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// so now.
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uint32_t valNum = 0;
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if (isa<BinaryOperator>(*I) || isa<CmpInst>(*I))
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valNum = VN.lookup(*I);
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else
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valNum = VN.lookup_or_add(*I);
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if (find_leader(anticIn, valNum) == 0)
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val_insert(anticIn, *I);
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}
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