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| author | Devang Patel <dpatel@apple.com> | 2008-09-09 01:06:56 +0000 |
|---|---|---|
| committer | Devang Patel <dpatel@apple.com> | 2008-09-09 01:06:56 +0000 |
| commit | e435a5d9374b61049b16ef69e6314542815fadb4 (patch) | |
| tree | 03335a3e76eed83ae027b32dc2dbfa272e0b7d7e /lib/Transforms | |
| parent | f72fb679eff7de84e3e18b75d63a18cb3510bcdd (diff) | |
| download | llvm-e435a5d9374b61049b16ef69e6314542815fadb4.tar.gz llvm-e435a5d9374b61049b16ef69e6314542815fadb4.tar.bz2 llvm-e435a5d9374b61049b16ef69e6314542815fadb4.tar.xz | |
Fix simplifycfg crash in handing block merge.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55971 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Utils/BasicBlockUtils.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/BasicBlockUtils.cpp b/lib/Transforms/Utils/BasicBlockUtils.cpp index 719bc8a34f..a98e1356ad 100644 --- a/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -54,7 +54,17 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock* BB, Pass* P) { // Can't merge if there are multiple successors. if (!OnlySucc) return false; - + + // Can't merge if there is PHI loop. + for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE; ++BI) { + if (PHINode *PN = dyn_cast<PHINode>(BI)) { + for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) + if (PN->getIncomingValue(i) == PN) + return false; + } else + break; + } + // Begin by getting rid of unneeded PHIs. while (PHINode *PN = dyn_cast<PHINode>(&BB->front())) { PN->replaceAllUsesWith(PN->getIncomingValue(0)); |