if (lhs && lhs.isSplat()) {
    APFloat lhs_value = lhs.getSplatValue<APFloat>();
    lhs_value.changeSign();
    if (lhs_value.isLargest()) return getRhs();
  }
  if (rhs && rhs.isSplat()) {
    APFloat rhs_value = rhs.getSplatValue<APFloat>();
    rhs_value.changeSign();
    if (rhs_value.isLargest()) return getLhs();
  }
  return nullptr;
}

      // transformation:
      // w * (x + c) + b => w * x + (w * c + b)
      // so we have to update the bias.
      if (llvm::isa<SubOp>(binary_op)) cst_value.changeSign();

      auto bias_and_slice =
          GetBiasDimAndSliceSize(filter_type.getShape(), fc_op);
      int64_t bias_size = bias_and_slice.first;
      int64_t slice_size = bias_and_slice.second;