src/share/vm/opto/parse3.cpp

@@ -231,11 +231,12 @@
     insert_mem_bar(Op_MemBarVolatile);   // StoreLoad barrier
   }
   // Build the load.
   //
   MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered;
-  Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, is_vol);
+  bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
+  Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, needs_atomic_access);
 
   // Adjust Java stack
   if (type2size[bt] == 1)
     push(ld);
   else

@@ -312,11 +313,12 @@
     } else {
       field_type = TypeOopPtr::make_from_klass(field->type()->as_klass());
     }
     store = store_oop_to_object(control(), obj, adr, adr_type, val, field_type, bt, mo);
   } else {
-    store = store_to_memory(control(), adr, val, bt, adr_type, mo, is_vol);
+    bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
+    store = store_to_memory(control(), adr, val, bt, adr_type, mo, needs_atomic_access);
   }
 
   // If reference is volatile, prevent following volatiles ops from
   // floating up before the volatile write.
   if (is_vol) {