@Override
  public int getExprentUse() {
    if (funcType >= FUNCTION_IMM && funcType <= FUNCTION_PPI) {
      return 0;
    }
    else {
      int ret = Exprent.MULTIPLE_USES | Exprent.SIDE_EFFECTS_FREE;
      for (Exprent expr : lstOperands) {
        ret &= expr.getExprentUse();
      }
      return ret;
    }
  }
@Override
  public int getExprentUse()