1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 72fa468db6..09f4fb2e13 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -2168,7 +2168,9 @@ bool SimplifyCFGOpt::SimplifyUnreachable(UnreachableInst *UI) {
       if (LI->isVolatile())
         break;
     
-    // Delete this instruction
+    // Delete this instruction (any uses are guaranteed to be dead)
+    if (!BBI->use_empty())
+      BBI->replaceAllUsesWith(UndefValue::get(BBI->getType()));
     BBI->eraseFromParent();
     Changed = true;
   }