// Copyright (c) 2018-2019 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// THE SOFTWARE.

#ifndef ROCPRIM_DEVICE_DEVICE_REDUCE_CONFIG_HPP_
#define ROCPRIM_DEVICE_DEVICE_REDUCE_CONFIG_HPP_

#include <type_traits>

#include "../config.hpp"
#include "../detail/various.hpp"

#include "../block/block_reduce.hpp"

#include "config_types.hpp"
#include "detail/device_config_helper.hpp"

/// \addtogroup primitivesmodule_deviceconfigs
/// @{

BEGIN_ROCPRIM_NAMESPACE


namespace detail
{

template<class Value>
struct reduce_config_803
{
    static constexpr unsigned int item_scale =
        ::rocprim::detail::ceiling_div<unsigned int>(sizeof(Value), sizeof(int));

    using type = reduce_config<
        limit_block_size<256U, sizeof(Value), ROCPRIM_WARP_SIZE_64>::value,
        ::rocprim::max(1u, 16u / item_scale),
        ::rocprim::block_reduce_algorithm::using_warp_reduce
    >;
};

template<class Value>
struct reduce_config_900
{
    static constexpr unsigned int item_scale =
        ::rocprim::detail::ceiling_div<unsigned int>(sizeof(Value), sizeof(int));

    using type = reduce_config<
        limit_block_size<256U, sizeof(Value), ROCPRIM_WARP_SIZE_64>::value,
        ::rocprim::max(1u, 16u / item_scale),
        ::rocprim::block_reduce_algorithm::using_warp_reduce
    >;
};

// TODO: We need to update these parameters
template<class Value>
struct reduce_config_90a
{
    static constexpr unsigned int item_scale =
        ::rocprim::detail::ceiling_div<unsigned int>(sizeof(Value), sizeof(int));

    using type = reduce_config<
        limit_block_size<256U, sizeof(Value), ROCPRIM_WARP_SIZE_64>::value,
        ::rocprim::max(1u, 16u / item_scale),
        ::rocprim::block_reduce_algorithm::using_warp_reduce
    >;
};

// TODO: We need to update these parameters
template<class Value>
struct reduce_config_1030
{
    static constexpr unsigned int item_scale =
        ::rocprim::detail::ceiling_div<unsigned int>(sizeof(Value), sizeof(int));

    using type = reduce_config<
        limit_block_size<256U, sizeof(Value), ROCPRIM_WARP_SIZE_32>::value,
        ::rocprim::max(1u, 16u / item_scale),
        ::rocprim::block_reduce_algorithm::using_warp_reduce
    >;
};

template<unsigned int TargetArch, class Value>
struct default_reduce_config
    : select_arch<
        TargetArch,
        select_arch_case<803, reduce_config_803<Value>>,
        select_arch_case<900, reduce_config_900<Value>>,
        select_arch_case<ROCPRIM_ARCH_90a, reduce_config_90a<Value>>,
        select_arch_case<1030, reduce_config_1030<Value>>,
        reduce_config_900<Value>
    > { };

} // end namespace detail

END_ROCPRIM_NAMESPACE

/// @}
// end of group primitivesmodule_deviceconfigs

#endif // ROCPRIM_DEVICE_DEVICE_REDUCE_CONFIG_HPP_
