return UNCHANGED;
return DefUseEffect.UNCHANGED;
  private static byte int2Double(OPT_Instruction s) {   if (CF_DOUBLE) {      OPT_Operand op = Unary.getVal(s);      if (op.isIntConstant()) {        // CONSTANT: FOLD        int val = op.asIntConstant().value;        Move.mutate(s, DOUBLE_MOVE, Unary.getClearResult(s),                     DC((double)val));        return MOVE_FOLDED;      }    }    return UNCHANGED;  }