// Match Add.
    DenseElementsAttr added_value;
    Value constant_val = add_op.getRhs();
    if (!matchPattern(constant_val, m_Constant(&added_value))) {
      // The constant may be preceded by QDQs in models with QDQ format, so we
      // should set it to the real constant.
      auto dq = dyn_cast_or_null<DequantizeOp>(constant_val.getDefiningOp());
      if (!dq) return failure();