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Handle constants in phi nodes properly. This fixes test/Transforms/GVNPRE/2007-06-18-ConstantInPhi.ll

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llvm-svn: 37655
This commit is contained in:
Owen Anderson 2007-06-19 07:35:36 +00:00
parent efa46b445c
commit 0eafdcafe7
1 changed files with 10 additions and 1 deletions
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11
lib/Transforms/Scalar/GVNPRE.cpp
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@ -927,7 +927,16 @@ bool GVNPRE::runOnFunction(Function &F) {
for (std::set<Value*>::iterator I = S.begin(), E = S.end();
I != E; ++I) {
if (find_leader(anticIn, VN.lookup(*I)) == 0)
// For non-opaque values, we should already have a value numbering.
// However, for opaques, such as constants within PHI nodes, it is
// possible that they have not yet received a number. Make sure they do
// so now.
uint32_t valNum = 0;
if (isa<BinaryOperator>(*I) || isa<CmpInst>(*I))
valNum = VN.lookup(*I);
else
valNum = VN.lookup_or_add(*I);
if (find_leader(anticIn, valNum) == 0)
val_insert(anticIn, *I);
}