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Fix bug: SCCP/2003-06-24-OverdefinedPHIValue.ll

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llvm-svn: 6883
This commit is contained in:
Chris Lattner 2003-06-24 20:29:52 +00:00
parent 30f1a88e0c
commit 867b7661cb
1 changed files with 5 additions and 4 deletions
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9
lib/Transforms/Scalar/SCCP.cpp
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@ -420,12 +420,13 @@ void SCCP::visitPHINode(PHINode &PN) {
for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
InstVal &IV = getValueState(PN.getIncomingValue(i)); InstVal &IV = getValueState(PN.getIncomingValue(i));
if (IV.isUndefined()) continue; // Doesn't influence PHI node. if (IV.isUndefined()) continue; // Doesn't influence PHI node.
if (IV.isOverdefined()) { // PHI node becomes overdefined!
markOverdefined(&PN);
return;
}
if (isEdgeFeasible(PN.getIncomingBlock(i), PN.getParent())) { if (isEdgeFeasible(PN.getIncomingBlock(i), PN.getParent())) {
if (IV.isOverdefined()) { // PHI node becomes overdefined!
markOverdefined(&PN);
return;
}
if (OperandVal == 0) { // Grab the first value... if (OperandVal == 0) { // Grab the first value...
OperandVal = IV.getConstant(); OperandVal = IV.getConstant();
} else { // Another value is being merged in! } else { // Another value is being merged in!