1 files changed, 4 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index c933a178d7..23d0bb51b3 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -1262,7 +1262,10 @@ static bool needsLFTR(Loop *L, DominatorTree *DT) {
     return true;
 
   // Do LFTR if the exit condition's IV is *not* a simple counter.
-  Value *IncV = Phi->getIncomingValueForBlock(L->getLoopLatch());
+  int Idx = Phi->getBasicBlockIndex(L->getLoopLatch());
+  if (Idx < 0)
+    return true;
+  Value *IncV = Phi->getIncomingValue(Idx);
   return Phi != getLoopPhiForCounter(IncV, L, DT);
 }