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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 | ef8c8332b1307c27491c1a783c1fe520fec94170 (patch) | |
| tree | 3f87036bf037750d593dca269f1673d8a1de2625 /llvm/lib/VMCore | |
| parent | b68a34eb3fe6817f9e1a745f1795a38fd48afb52 (diff) | |
| download | bcm5719-llvm-ef8c8332b1307c27491c1a783c1fe520fec94170.tar.gz bcm5719-llvm-ef8c8332b1307c27491c1a783c1fe520fec94170.zip | |
Fix a bug that occurred when removing the last predecessor INTO an
infinite loop
llvm-svn: 5953
Diffstat (limited to 'llvm/lib/VMCore')
| -rw-r--r-- | llvm/lib/VMCore/BasicBlock.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/VMCore/BasicBlock.cpp b/llvm/lib/VMCore/BasicBlock.cpp index 04f4e1cfc0d..d04e5546162 100644 --- a/llvm/lib/VMCore/BasicBlock.cpp +++ b/llvm/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 } |
