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Fix a bug that occurred when removing the last predecessor INTO an

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infinite loop


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-04-25 23:14:19 +00:00
parent 619f825640
commit 02a78cf7ea
1 changed files with 5 additions and 1 deletions
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6
lib/VMCore/BasicBlock.cpp
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@ -186,7 +186,11 @@ void BasicBlock::removePredecessor(BasicBlock *Pred) {
// If the PHI _HAD_ two uses, replace PHI node with its now *single* value
if (max_idx == 2) {
PN->replaceAllUsesWith(PN->getOperand(0));
if (PN->getOperand(0) != PN)
PN->replaceAllUsesWith(PN->getOperand(0));
else
// We are left with an infinite loop with no entries: kill the PHI.
PN->replaceAllUsesWith(Constant::getNullValue(PN->getType()));
getInstList().pop_front(); // Remove the PHI node
}