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 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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#pragma once

#include <cub/config.cuh>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <cub/agent/agent_select_if.cuh>
#include <cub/agent/single_pass_scan_operators.cuh>
#include <cub/block/block_load.cuh>
#include <cub/block/block_scan.cuh>
#include <cub/util_device.cuh>
#include <cub/util_type.cuh>

CUB_NAMESPACE_BEGIN

namespace detail
{

namespace select
{

enum class flagged
{
  no,
  yes
};
enum class keep_rejects
{
  no,
  yes
};
enum class primitive
{
  no,
  yes
};
enum class offset_size
{
  _4,
  _8,
  unknown
};
enum class input_size
{
  _1,
  _2,
  _4,
  _8,
  _16,
  unknown
};

template <class InputT>
constexpr primitive is_primitive()
{
  return Traits<InputT>::PRIMITIVE ? primitive::yes : primitive::no;
}

template <class FlagT>
constexpr flagged is_flagged()
{
  return std::is_same<FlagT, NullType>::value ? flagged::no : flagged::yes;
}

template <bool KeepRejects>
constexpr keep_rejects are_rejects_kept()
{
  return KeepRejects ? keep_rejects::yes : keep_rejects::no;
}

template <class InputT>
constexpr input_size classify_input_size()
{
  return sizeof(InputT) == 1 ? input_size::_1
       : sizeof(InputT) == 2 ? input_size::_2
       : sizeof(InputT) == 4 ? input_size::_4
       : sizeof(InputT) == 8 ? input_size::_8
       : sizeof(InputT) == 16
         ? input_size::_16
         : input_size::unknown;
}

template <class OffsetT>
constexpr offset_size classify_offset_size()
{
  return sizeof(OffsetT) == 4 ? offset_size::_4 : sizeof(OffsetT) == 8 ? offset_size::_8 : offset_size::unknown;
}

template <class InputT,
          flagged,
          keep_rejects,
          offset_size OffsetSize,
          primitive            = is_primitive<InputT>(),
          input_size InputSize = classify_input_size<InputT>()>
struct sm90_tuning
{
  static constexpr int threads = 128;

  static constexpr int nominal_4b_items_per_thread = 10;

  static constexpr int items =
    CUB_MIN(nominal_4b_items_per_thread, CUB_MAX(1, (nominal_4b_items_per_thread * 4 / sizeof(InputT))));

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<350, 450>;
};

// select::if
template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 256;
  static constexpr int items   = 22;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<580>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 256;
  static constexpr int items   = 22;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<320, 605>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 384;
  static constexpr int items   = 17;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<76, 1150>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 384;
  static constexpr int items   = 11;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<380, 1140>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm90_tuning<__int128_t, flagged::no, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 512;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<460, 1145>;
};

template <>
struct sm90_tuning<__uint128_t, flagged::no, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 512;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<460, 1145>;
};
#endif

// select::flagged
template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 448;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<715>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 448;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<504, 765>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 384;
  static constexpr int items   = 15;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<415, 1125>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 384;
  static constexpr int items   = 11;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<360, 1170>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm90_tuning<__int128_t, flagged::yes, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 512;
  static constexpr int items   = 3;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<284, 1130>;
};

template <>
struct sm90_tuning<__uint128_t, flagged::yes, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 512;
  static constexpr int items   = 3;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<284, 1130>;
};
#endif

// partition::if
template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 384;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<908, 995>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 320;
  static constexpr int items   = 14;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<500, 560>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 256;
  static constexpr int items   = 14;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<536, 1055>;
};

template <class Input>
struct sm90_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 128;
  static constexpr int items   = 12;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<512, 1075>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm90_tuning<__int128_t, flagged::no, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 192;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<1616, 1115>;
};

template <>
struct sm90_tuning<__uint128_t, flagged::no, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 192;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<1616, 1115>;
};
#endif

// partition::flagged
template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 256;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<580, 850>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 512;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<388, 1055>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 256;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<72, 1165>;
};

template <class Input>
struct sm90_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 224;
  static constexpr int items   = 6;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<532, 1180>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm90_tuning<__int128_t, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 160;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<720, 1105>;
};

template <>
struct sm90_tuning<__uint128_t, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 160;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<720, 1105>;
};
#endif

template <class InputT,
          flagged,
          keep_rejects,
          offset_size OffsetSize,
          primitive            = is_primitive<InputT>(),
          input_size InputSize = classify_input_size<InputT>()>
struct sm80_tuning
{
  static constexpr int threads = 128;

  static constexpr int nominal_4b_items_per_thread = 10;

  static constexpr int items =
    CUB_MIN(nominal_4b_items_per_thread, CUB_MAX(1, (nominal_4b_items_per_thread * 4 / sizeof(InputT))));

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<350, 450>;
};

// select::if
template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 992;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<395>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 576;
  static constexpr int items   = 14;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<870>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 256;
  static constexpr int items   = 18;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::no_delay_constructor_t<1130>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 192;
  static constexpr int items   = 10;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<832, 1165>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm80_tuning<__int128_t, flagged::no, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 384;
  static constexpr int items   = 4;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<1140>;
};

template <>
struct sm80_tuning<__uint128_t, flagged::no, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 384;
  static constexpr int items   = 4;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<1140>;
};
#endif

// select::flagged
template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 224;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<735>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 256;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::no_delay_constructor_t<1155>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 320;
  static constexpr int items   = 10;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<124, 1115>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::no, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 384;
  static constexpr int items   = 6;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<1130>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm80_tuning<__int128_t, flagged::yes, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<464, 1025>;
};

template <>
struct sm80_tuning<__uint128_t, flagged::yes, keep_rejects::no, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<464, 1025>;
};
#endif

// partition::if
template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 512;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<510>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 224;
  static constexpr int items   = 18;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::no_delay_constructor_t<1045>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 192;
  static constexpr int items   = 15;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<1040>;
};

template <class Input>
struct sm80_tuning<Input, flagged::no, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 192;
  static constexpr int items   = 10;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<68, 1160>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm80_tuning<__int128_t, flagged::no, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<400, 1090>;
};

template <>
struct sm80_tuning<__uint128_t, flagged::no, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<400, 1090>;
};
#endif

// partition::flagged
template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_1>
{
  static constexpr int threads = 512;
  static constexpr int items   = 20;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::no_delay_constructor_t<595>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_2>
{
  static constexpr int threads = 224;
  static constexpr int items   = 18;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::no_delay_constructor_t<1105>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_4>
{
  static constexpr int threads = 192;
  static constexpr int items   = 12;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_DIRECT;

  using delay_constructor = detail::fixed_delay_constructor_t<912, 1025>;
};

template <class Input>
struct sm80_tuning<Input, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::yes, input_size::_8>
{
  static constexpr int threads = 192;
  static constexpr int items   = 12;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<884, 1130>;
};

#if CUB_IS_INT128_ENABLED
template <>
struct sm80_tuning<__int128_t, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<400, 1090>;
};

template <>
struct sm80_tuning<__uint128_t, flagged::yes, keep_rejects::yes, offset_size::_4, primitive::no, input_size::_16>
{
  static constexpr int threads = 256;
  static constexpr int items   = 5;

  static constexpr BlockLoadAlgorithm load_algorithm = BLOCK_LOAD_WARP_TRANSPOSE;

  using delay_constructor = detail::fixed_delay_constructor_t<400, 1090>;
};
#endif

} // namespace select

template <class InputT, class FlagT, class OffsetT, bool MayAlias, bool KeepRejects>
struct device_select_policy_hub
{
  struct DefaultTuning
  {
    static constexpr int NOMINAL_4B_ITEMS_PER_THREAD = 10;

    static constexpr int ITEMS_PER_THREAD =
      CUB_MIN(NOMINAL_4B_ITEMS_PER_THREAD, CUB_MAX(1, (NOMINAL_4B_ITEMS_PER_THREAD * 4 / sizeof(InputT))));

    using SelectIfPolicyT =
      AgentSelectIfPolicy<128,
                          ITEMS_PER_THREAD,
                          BLOCK_LOAD_DIRECT,
                          MayAlias ? LOAD_CA : LOAD_LDG,
                          BLOCK_SCAN_WARP_SCANS,
                          detail::fixed_delay_constructor_t<350, 450>>;
  };

  struct Policy350
      : DefaultTuning
      , ChainedPolicy<350, Policy350, Policy350>
  {};

  struct Policy800 : ChainedPolicy<800, Policy800, Policy350>
  {
    using tuning =
      detail::select::sm80_tuning<InputT,
                                  select::is_flagged<FlagT>(),
                                  select::are_rejects_kept<KeepRejects>(),
                                  select::classify_offset_size<OffsetT>()>;

    using SelectIfPolicyT =
      AgentSelectIfPolicy<tuning::threads,
                          tuning::items,
                          tuning::load_algorithm,
                          LOAD_DEFAULT,
                          BLOCK_SCAN_WARP_SCANS,
                          typename tuning::delay_constructor>;
  };

  struct Policy860
      : DefaultTuning
      , ChainedPolicy<860, Policy860, Policy800>
  {};

  struct Policy900 : ChainedPolicy<900, Policy900, Policy860>
  {
    using tuning =
      detail::select::sm90_tuning<InputT,
                                  select::is_flagged<FlagT>(),
                                  select::are_rejects_kept<KeepRejects>(),
                                  select::classify_offset_size<OffsetT>()>;

    using SelectIfPolicyT =
      AgentSelectIfPolicy<tuning::threads,
                          tuning::items,
                          tuning::load_algorithm,
                          LOAD_DEFAULT,
                          BLOCK_SCAN_WARP_SCANS,
                          typename tuning::delay_constructor>;
  };

  using MaxPolicy = Policy900;
};

} // namespace detail

CUB_NAMESPACE_END