*** old/src/share/vm/opto/memnode.cpp	Thu Oct 23 22:11:38 2014
--- new/src/share/vm/opto/memnode.cpp	Thu Oct 23 22:11:38 2014

*** 1255,1264 ****
--- 1255,1274 ----
  #else
              if (bt == T_LONG) {
                result = new ConvI2LNode(phase->transform(result));
              }
  #endif
+             // Boxing/unboxing can be done from signed & unsigned loads (e.g. LoadUB -> ... -> LoadB pair).
+             // Need to preserve unboxing load type if it is unsigned.
+             switch(this->Opcode()) {
+               case Op_LoadUB:
+                 result = new AndINode(phase->transform(result), phase->intcon(0xFF));
+                 break;
+               case Op_LoadUS:
+                 result = new AndINode(phase->transform(result), phase->intcon(0xFFFF));
+                 break;
+             }
              return result;
            }
          }
        }
      }