commit f8a8129513b9e2f2fd23c9a27e2b0e7a985fe1c4
author Jakub Staszak <kubastaszak@gmail.com> Wed Oct 03 23:59:47 2012 +0000
committer Jakub Staszak <kubastaszak@gmail.com> Wed Oct 03 23:59:47 2012 +0000
tree 337035be433d79fc266b9ea73bd1f4ed9e485101
parent f175ad152c187e76260fb562bc99febcabd77a45

Fix PR13967.

llvm-svn: 165187

llvm/lib/Transforms/Scalar/IndVarSimplify.cpp

diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
index c933a17..23d0bb5 100644
--- a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -1262,7 +1262,10 @@
     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);
 }