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Diffstat (limited to 'lib/Transforms/Utils/BasicBlockUtils.cpp')
| -rw-r--r-- | lib/Transforms/Utils/BasicBlockUtils.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/BasicBlockUtils.cpp b/lib/Transforms/Utils/BasicBlockUtils.cpp index d889422992..719bc8a34f 100644 --- a/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -39,6 +39,10 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock* BB, Pass* P) { // Can't merge if there are multiple predecessors. if (!PredBB) return false; + // Don't break self-loops. + if (PredBB == BB) return false; + // Don't break invokes. + if (isa<InvokeInst>(PredBB->getTerminator())) return false; succ_iterator SI(succ_begin(PredBB)), SE(succ_end(PredBB)); BasicBlock* OnlySucc = BB; |