Index: llvm/lib/Transforms/Scalar/LoopDataPrefetch.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopDataPrefetch.cpp
+++ llvm/lib/Transforms/Scalar/LoopDataPrefetch.cpp
@@ -213,10 +213,9 @@
 bool LoopDataPrefetch::run() {
   // If PrefetchDistance is not set, don't run the pass.  This gives an
   // opportunity for targets to run this pass for selected subtargets only
-  // (whose TTI sets PrefetchDistance).
-  if (getPrefetchDistance() == 0)
+  // (whose TTI sets PrefetchDistance and CacheLineSize).
+  if (getPrefetchDistance() == 0 || TTI->getCacheLineSize() == 0)
     return false;
-  assert(TTI->getCacheLineSize() && "Cache line size is not set for target");
 
   bool MadeChange = false;