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Fix bug: SimplifyCFG/2002-09-24-PHIAssertion.ll

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llvm-svn: 3913
This commit is contained in:
Chris Lattner 2002-09-24 16:09:17 +00:00
parent 5323e8ef58
commit 54cf78c786
1 changed files with 4 additions and 3 deletions
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7
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -167,15 +167,16 @@ bool SimplifyCFG(BasicBlock *BB) {
TerminatorInst *Term = OnlyPred->getTerminator();
// Resolve any PHI nodes at the start of the block. They are all
// guaranteed to have exactly one entry if they exist.
// guaranteed to have exactly one entry if they exist, unless there are
// multiple duplicate (but guaranteed to be equal) entries for the
// incoming edges. This occurs when there are multiple edges from
// OnlyPred to OnlySucc.
//
while (PHINode *PN = dyn_cast<PHINode>(&BB->front())) {
assert(PN->getNumIncomingValues() == 1 && "Only one pred!");
PN->replaceAllUsesWith(PN->getIncomingValue(0));
BB->getInstList().pop_front(); // Delete the phi node...
}
// Delete the unconditional branch from the predecessor...
OnlyPred->getInstList().pop_back();