1 files changed, 6 insertions, 1 deletions
diff --git a/contrib/llvm-project/llvm/lib/Transforms/Scalar/SCCP.cpp b/contrib/llvm-project/llvm/lib/Transforms/Scalar/SCCP.cpp
index de6be52adf21..8feed9e9ebfe 100644
--- a/contrib/llvm-project/llvm/lib/Transforms/Scalar/SCCP.cpp
+++ b/contrib/llvm-project/llvm/lib/Transforms/Scalar/SCCP.cpp
@@ -542,9 +542,14 @@ private:
 
     auto Iter = AdditionalUsers.find(I);
     if (Iter != AdditionalUsers.end()) {
+      // Copy additional users before notifying them of changes, because new
+      // users may be added, potentially invalidating the iterator.
+      SmallVector<Instruction *, 2> ToNotify;
       for (User *U : Iter->second)
         if (auto *UI = dyn_cast<Instruction>(U))
-          OperandChangedState(UI);
+          ToNotify.push_back(UI);
+      for (Instruction *UI : ToNotify)
+        OperandChangedState(UI);
     }
   }
   void handleCallOverdefined(CallBase &CB);