protected final boolean U16 (OPT_Operand a) { return  (IV(a) & 0xffff) == 0;
protected final boolean U16 (int value) { return  (value & 0xffff) == 0;
  protected final boolean U16 (OPT_Operand a) {    return  (IV(a) & 0xffff) == 0;  }