diff -r eb178e97560c -r 2113136690bc src/share/vm/opto/stringopts.cpp
--- a/src/share/vm/opto/stringopts.cpp	Thu Nov 07 11:47:11 2013 +0100
+++ b/src/share/vm/opto/stringopts.cpp	Fri Nov 15 11:05:32 2013 -0800
@@ -1122,7 +1122,8 @@
 
   return kit.make_load(NULL, kit.basic_plus_adr(klass_node, field->offset_in_bytes()),
                        type, T_OBJECT,
-                       C->get_alias_index(mirror_type->add_offset(field->offset_in_bytes())));
+                       C->get_alias_index(mirror_type->add_offset(field->offset_in_bytes())),
+                       MemNode::unordered);
 }
 
 Node* PhaseStringOpts::int_stringSize(GraphKit& kit, Node* arg) {
@@ -1314,7 +1315,7 @@
     Node* ch = __ AddI(r, __ intcon('0'));
 
     Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR),
-                                  ch, T_CHAR, char_adr_idx);
+                                  ch, T_CHAR, char_adr_idx, MemNode::unordered);
 
 
     IfNode* iff = kit.create_and_map_if(head, __ Bool(__ CmpI(q, __ intcon(0)), BoolTest::ne),
@@ -1356,7 +1357,7 @@
     } else {
       Node* m1 = __ SubI(charPos, __ intcon(1));
       Node* st = __ store_to_memory(kit.control(), kit.array_element_address(char_array, m1, T_CHAR),
-                                    sign, T_CHAR, char_adr_idx);
+                                    sign, T_CHAR, char_adr_idx, MemNode::unordered);
 
       final_merge->init_req(1, kit.control());
       final_mem->init_req(1, st);
@@ -1387,7 +1388,8 @@
     ciTypeArray* value_array = t->const_oop()->as_type_array();
     for (int e = 0; e < c; e++) {
       __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR),
-                         __ intcon(value_array->char_at(o + e)), T_CHAR, char_adr_idx);
+                         __ intcon(value_array->char_at(o + e)), T_CHAR, char_adr_idx,
+                         MemNode::unordered);
       start = __ AddI(start, __ intcon(1));
     }
   } else {
@@ -1607,7 +1609,7 @@
         }
         case StringConcat::CharMode: {
           __ store_to_memory(kit.control(), kit.array_element_address(char_array, start, T_CHAR),
-                             arg, T_CHAR, char_adr_idx);
+                             arg, T_CHAR, char_adr_idx, MemNode::unordered);
           start = __ AddI(start, __ intcon(1));
           break;
         }