--- old/src/share/vm/opto/graphKit.cpp	2013-10-07 16:51:29.857387145 +0200
+++ new/src/share/vm/opto/graphKit.cpp	2013-10-07 16:51:29.765387149 +0200
@@ -3772,6 +3772,7 @@
 
         __ if_then(card_val, BoolTest::ne, young_card); {
           sync_kit(ideal);
+          // Use Op_MemBarVolatile to achieve the effect of a StoreLoad barrier.
           insert_mem_bar(Op_MemBarVolatile, oop_store);
           __ sync_kit(this);