vendor/llvm/llvm-release_371-r255217

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 50ca6234d0b7..ba8af47b54e1 100644
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -869,6 +869,11 @@ bool llvm::EliminateDuplicatePHINodes(BasicBlock *BB) {
       PN->replaceAllUsesWith(*Inserted.first);
       PN->eraseFromParent();
       Changed = true;
+
+      // The RAUW can change PHIs that we already visited. Start over from the
+      // beginning.
+      PHISet.clear();
+      I = BB->begin();
     }
   }