Index: lib/Transforms/InstCombine/InstCombineCasts.cpp
===================================================================
--- lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -904,7 +904,7 @@
   unsigned BitsToClear;
   if ((DestTy->isVectorTy() || shouldChangeType(SrcTy, DestTy)) &&
       canEvaluateZExtd(Src, DestTy, BitsToClear, *this, &CI)) {
-    assert(BitsToClear < SrcTy->getScalarSizeInBits() &&
+    assert(BitsToClear <= SrcTy->getScalarSizeInBits() &&
            "Unreasonable BitsToClear");
 
     // Okay, we can transform this!  Insert the new expression now.