Index: lib/Transforms/IPO/PassManagerBuilder.cpp
===================================================================
--- lib/Transforms/IPO/PassManagerBuilder.cpp
+++ lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -570,6 +570,8 @@
   // More loops are countable; try to optimize them.
   PM.add(createIndVarSimplifyPass());
   PM.add(createLoopDeletionPass());
+  if (!DisableUnrollLoops)
+    PM.add(createSimpleLoopUnrollPass());   // Unroll small loops
   if (EnableLoopInterchange)
     PM.add(createLoopInterchangePass());