diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils/BasicBlockUtils.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/BasicBlockUtils.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp index 0557b7d7442..81031b1a61e 100644 --- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -186,7 +186,9 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DomTreeUpdater *DTU, Updates.push_back({DominatorTree::Delete, PredBB, BB}); for (auto I = succ_begin(BB), E = succ_end(BB); I != E; ++I) { Updates.push_back({DominatorTree::Delete, BB, *I}); - Updates.push_back({DominatorTree::Insert, PredBB, *I}); + // This successor of BB may already have PredBB as a predecessor. + if (llvm::find(successors(PredBB), *I) == succ_end(PredBB)) + Updates.push_back({DominatorTree::Insert, PredBB, *I}); } } |
