// output ranges
  auto min = rop->getAttrOfType<FloatAttr>("min");
  auto max = rop->getAttrOfType<FloatAttr>("max");
  output_ranges->push_back(CalculateQuantizedRange(
      o_spec.getScale(), o_spec.getZeroPoint(),
      (min ? std::optional<double>(min.getValueAsDouble()) : std::nullopt),
      (max ? std::optional<double>(max.getValueAsDouble()) : std::nullopt),
      o_spec.getStorageTypeMin(), o_spec.getStorageTypeMax()));

    auto q_type = mlir::dyn_cast_or_null<quant::UniformQuantizedType>(
        input_type.getElementType());
    if (!q_type) return failure();

    const float scale = q_type.getScale();
    const float zp = q_type.getZeroPoint();

    auto input_values = input_dequant.getValue();

    // mapValues always takes a function returning APInt, even when the output
    // is actually float.