diff options
| -rw-r--r-- | lib/Transforms/Scalar/SCCP.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp index 4463a7fc44..df55037c52 100644 --- a/lib/Transforms/Scalar/SCCP.cpp +++ b/lib/Transforms/Scalar/SCCP.cpp @@ -420,12 +420,13 @@ void SCCP::visitPHINode(PHINode &PN) { for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { InstVal &IV = getValueState(PN.getIncomingValue(i)); 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 (IV.isOverdefined()) { // PHI node becomes overdefined! + markOverdefined(&PN); + return; + } + if (OperandVal == 0) { // Grab the first value... OperandVal = IV.getConstant(); } else { // Another value is being merged in! |