src/share/vm/c1/c1_LIRAssembler.cpp

rev 3419 : 7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
Summary: use shorter instruction sequences for atomic add and atomic exchange when possible.
Reviewed-by:

*** 763,772 ****
--- 763,777 ----
  
      case lir_throw:
        throw_op(op->in_opr1(), op->in_opr2(), op->info());
        break;
  
+     case lir_xadd:
+     case lir_xchg:
+       atomic_op(op->code(), op->in_opr1(), op->in_opr2(), op->result_opr(), op->tmp1_opr());
+       break;
+ 
      default:
        Unimplemented();
        break;
    }
  }