return MOVE_FOLDED;
return DefUseEffect.MOVE_FOLDED;
  private static byte longNot(OPT_Instruction s) {   if (CF_LONG) {      OPT_Operand op = Unary.getVal(s);      if (op.isLongConstant()) {        long val = op.asLongConstant().value;        // CONSTANT: FOLD        Move.mutate(s, LONG_MOVE, Binary.getClearResult(s), LC(~val));        return MOVE_FOLDED;      }    }    return UNCHANGED;  }