--- a/src/hotspot/share/opto/superword.cpp	Mon Jul 09 11:15:55 2018 -0700
+++ b/src/hotspot/share/opto/superword.cpp	Mon Jul 09 13:25:08 2018 -0700
@@ -376,6 +376,7 @@
                 if (same_type) {
                   max_vector = cur_max_vector;
                   flag_small_bt = true;
+                  cl->mark_subword_loop();
                 }
               }
             }