diff --git a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
--- a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
@@ -385,7 +385,7 @@
   if (BasicBlock *UniquePred = RI->getParent()->getUniquePredecessor())
     if (SwitchInst *SI = dyn_cast<SwitchInst>(UniquePred->getTerminator()))
       if (SI->getCondition() == V)
-        return SI->getDefaultDest() != RI->getParent();
+        return SI->findCaseDest(RI->getParent()) != nullptr;
 
   // Not a constant or immutable argument, we can't safely transform.
   return false;