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| author | Chris Lattner <sabre@nondot.org> | 2003-04-25 23:14:19 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2003-04-25 23:14:19 +0000 |
| commit | 02a78cf7eacf97f2c9584e29d02f77612aead35f (patch) | |
| tree | 007b074d2b5f6ada1b0cb3edf0e4547b0ef60534 /lib | |
| parent | 619f825640a02cb1ff84837eb911138f170c48c3 (diff) | |
| download | external_llvm-02a78cf7eacf97f2c9584e29d02f77612aead35f.zip external_llvm-02a78cf7eacf97f2c9584e29d02f77612aead35f.tar.gz external_llvm-02a78cf7eacf97f2c9584e29d02f77612aead35f.tar.bz2 | |
Fix a bug that occurred when removing the last predecessor INTO an
infinite loop
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5953 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/VMCore/BasicBlock.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/VMCore/BasicBlock.cpp b/lib/VMCore/BasicBlock.cpp index 04f4e1c..d04e554 100644 --- a/lib/VMCore/BasicBlock.cpp +++ b/lib/VMCore/BasicBlock.cpp @@ -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 } |