// MIT License
//
// Copyright (c) 2017-2022 Advanced Micro Devices, Inc. All rights reserved.
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#ifndef TEST_DEVICE_SEGMENTED_RADIX_SORT_HPP_
#define TEST_DEVICE_SEGMENTED_RADIX_SORT_HPP_

#include "../common_test_header.hpp"

// required rocprim headers
#include <rocprim/device/device_segmented_radix_sort.hpp>

// required test headers
#include "test_utils_custom_float_type.hpp"
#include "test_utils_sort_comparator.hpp"
#include "test_utils_types.hpp"

template<class Key,
         class Value,
         bool         Descending,
         unsigned int StartBit,
         unsigned int EndBit,
         unsigned int MinSegmentLength,
         unsigned int MaxSegmentLength,
         class Config = rocprim::default_config>
struct params
{
    using key_type                                   = Key;
    using value_type                                 = Value;
    static constexpr bool         descending         = Descending;
    static constexpr unsigned int start_bit          = StartBit;
    static constexpr unsigned int end_bit            = EndBit;
    static constexpr unsigned int min_segment_length = MinSegmentLength;
    static constexpr unsigned int max_segment_length = MaxSegmentLength;
    using config                                     = Config;
};

using config_default = rocprim::segmented_radix_sort_config<
    4, //< long radix bits
    3, //< short radix bits
    rocprim::kernel_config<256, 4> //< sort block size, items per thread
    >;

using config_semi_custom = rocprim::segmented_radix_sort_config<
    3, //< long radix bits
    2, //< short radix bits
    rocprim::kernel_config<128, 4>, //< sort block size, items per thread
    rocprim::WarpSortConfig<16, //< logical warp size small
                            8 //< items per thread small
                            >>;

using config_semi_custom_warp_config = rocprim::segmented_radix_sort_config<
    3, //< long radix bits
    2, //< short radix bits
    rocprim::kernel_config<128, 4>, //< sort block size, items per thread
    rocprim::WarpSortConfig<16, //< logical warp size small
                            2, //< items per thread small
                            512, //< block size small
                            0, //< partitioning threshold
                            true //< enable unpartitioned sort
                            >>;

using config_custom = rocprim::segmented_radix_sort_config<
    3, //< long radix bits
    2, //< short radix bits
    rocprim::kernel_config<128, 4>, //< sort block size, items per thread
    rocprim::WarpSortConfig<16, //< logical warp size small
                            2, //< items per thread small
                            512, //< block size small
                            0, //< partitioning threshold
                            true, //< enable unpartitioned sort
                            32, //< logical warp size medium
                            4, //< items per thread medium
                            256 //< block size medium
                            >>;

template<class Params>
class RocprimDeviceSegmentedRadixSort : public ::testing::Test
{
public:
    using params = Params;
};

TYPED_TEST_SUITE_P(RocprimDeviceSegmentedRadixSort);

template<typename TestFixture>
inline void sort_keys()
{
    int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id = " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    using key_type                           = typename TestFixture::params::key_type;
    using config                             = typename TestFixture::params::config;
    static constexpr bool         descending = TestFixture::params::descending;
    static constexpr unsigned int start_bit  = TestFixture::params::start_bit;
    static constexpr unsigned int end_bit    = TestFixture::params::end_bit;

    using offset_type = unsigned int;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    std::random_device         rd;
    std::default_random_engine gen(rd());

    std::uniform_int_distribution<size_t> segment_length_dis(
        TestFixture::params::min_segment_length,
        TestFixture::params::max_segment_length);

    for(size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        unsigned int seed_value
            = seed_index < random_seeds_count ? rand() : seeds[seed_index - random_seeds_count];
        SCOPED_TRACE(testing::Message() << "with seed = " << seed_value);

        for(size_t size : test_utils::get_sizes(seed_value))
        {
            SCOPED_TRACE(testing::Message() << "with size = " << size);

            // Generate data
            std::vector<key_type> keys_input;
            if(rocprim::is_floating_point<key_type>::value)
            {
                keys_input = test_utils::get_random_data<key_type>(size,
                                                                   static_cast<key_type>(-1000),
                                                                   static_cast<key_type>(+1000),
                                                                   seed_value);
            }
            else
            {
                keys_input
                    = test_utils::get_random_data<key_type>(size,
                                                            std::numeric_limits<key_type>::min(),
                                                            std::numeric_limits<key_type>::max(),
                                                            seed_index);
            }

            std::vector<offset_type> offsets;
            unsigned int             segments_count = 0;
            size_t                   offset         = 0;
            while(offset < size)
            {
                const size_t segment_length = segment_length_dis(gen);
                offsets.push_back(offset);
                segments_count++;
                offset += segment_length;
            }
            offsets.push_back(size);

            key_type* d_keys_input;
            key_type* d_keys_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input, size * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, size * sizeof(key_type)));
            HIP_CHECK(hipMemcpy(d_keys_input,
                                keys_input.data(),
                                size * sizeof(key_type),
                                hipMemcpyHostToDevice));

            offset_type* d_offsets;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_offsets,
                                                   (segments_count + 1) * sizeof(offset_type)));
            HIP_CHECK(hipMemcpy(d_offsets,
                                offsets.data(),
                                (segments_count + 1) * sizeof(offset_type),
                                hipMemcpyHostToDevice));

            // Calculate expected results on host
            std::vector<key_type> expected(keys_input);
            for(size_t i = 0; i < segments_count; i++)
            {
                std::stable_sort(
                    expected.begin() + offsets[i],
                    expected.begin() + offsets[i + 1],
                    test_utils::key_comparator<key_type, descending, start_bit, end_bit>());
            }

            size_t temporary_storage_bytes = 0;
            HIP_CHECK(rocprim::segmented_radix_sort_keys<config>(nullptr,
                                                                 temporary_storage_bytes,
                                                                 d_keys_input,
                                                                 d_keys_output,
                                                                 size,
                                                                 segments_count,
                                                                 d_offsets,
                                                                 d_offsets + 1,
                                                                 start_bit,
                                                                 end_bit));

            ASSERT_GT(temporary_storage_bytes, 0U);

            void* d_temporary_storage;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_temporary_storage, temporary_storage_bytes));

            if(descending)
            {
                HIP_CHECK(rocprim::segmented_radix_sort_keys_desc<config>(d_temporary_storage,
                                                                          temporary_storage_bytes,
                                                                          d_keys_input,
                                                                          d_keys_output,
                                                                          size,
                                                                          segments_count,
                                                                          d_offsets,
                                                                          d_offsets + 1,
                                                                          start_bit,
                                                                          end_bit,
                                                                          stream,
                                                                          debug_synchronous));
            }
            else
            {
                HIP_CHECK(rocprim::segmented_radix_sort_keys<config>(d_temporary_storage,
                                                                     temporary_storage_bytes,
                                                                     d_keys_input,
                                                                     d_keys_output,
                                                                     size,
                                                                     segments_count,
                                                                     d_offsets,
                                                                     d_offsets + 1,
                                                                     start_bit,
                                                                     end_bit,
                                                                     stream,
                                                                     debug_synchronous));
            }

            std::vector<key_type> keys_output(size);
            HIP_CHECK(hipMemcpy(keys_output.data(),
                                d_keys_output,
                                size * sizeof(key_type),
                                hipMemcpyDeviceToHost));

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_keys_input));
            HIP_CHECK(hipFree(d_keys_output));
            HIP_CHECK(hipFree(d_offsets));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, expected));
        }
    }
}

template<typename TestFixture>
inline void sort_pairs()
{
    int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id = " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    using key_type                    = typename TestFixture::params::key_type;
    using value_type                  = typename TestFixture::params::value_type;
    using config                      = typename TestFixture::params::config;
    constexpr bool         descending = TestFixture::params::descending;
    constexpr unsigned int start_bit  = TestFixture::params::start_bit;
    constexpr unsigned int end_bit    = TestFixture::params::end_bit;

    using offset_type = unsigned int;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    std::random_device         rd;
    std::default_random_engine gen(rd());

    std::uniform_int_distribution<size_t> segment_length_dis(
        TestFixture::params::min_segment_length,
        TestFixture::params::max_segment_length);

    for(size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        unsigned int seed_value
            = seed_index < random_seeds_count ? rand() : seeds[seed_index - random_seeds_count];
        SCOPED_TRACE(testing::Message() << "with seed = " << seed_value);

        for(size_t size : test_utils::get_sizes(seed_value))
        {
            SCOPED_TRACE(testing::Message() << "with size = " << size);

            // Generate data
            std::vector<key_type> keys_input;
            if(rocprim::is_floating_point<key_type>::value)
            {
                keys_input = test_utils::get_random_data<key_type>(size,
                                                                   static_cast<key_type>(-1000),
                                                                   static_cast<key_type>(+1000),
                                                                   seed_value);
            }
            else
            {
                keys_input
                    = test_utils::get_random_data<key_type>(size,
                                                            std::numeric_limits<key_type>::min(),
                                                            std::numeric_limits<key_type>::max(),
                                                            seed_index);
            }

            std::vector<offset_type> offsets;
            unsigned int             segments_count = 0;
            size_t                   offset         = 0;
            while(offset < size)
            {
                const size_t segment_length = segment_length_dis(gen);
                offsets.push_back(offset);
                segments_count++;
                offset += segment_length;
            }
            offsets.push_back(size);

            std::vector<value_type> values_input(size);
            test_utils::iota(values_input.begin(), values_input.end(), 0);

            key_type* d_keys_input;
            key_type* d_keys_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input, size * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, size * sizeof(key_type)));
            HIP_CHECK(hipMemcpy(d_keys_input,
                                keys_input.data(),
                                size * sizeof(key_type),
                                hipMemcpyHostToDevice));

            value_type* d_values_input;
            value_type* d_values_output;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_values_input, size * sizeof(value_type)));
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_values_output, size * sizeof(value_type)));
            HIP_CHECK(hipMemcpy(d_values_input,
                                values_input.data(),
                                size * sizeof(value_type),
                                hipMemcpyHostToDevice));

            offset_type* d_offsets;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_offsets,
                                                   (segments_count + 1) * sizeof(offset_type)));
            HIP_CHECK(hipMemcpy(d_offsets,
                                offsets.data(),
                                (segments_count + 1) * sizeof(offset_type),
                                hipMemcpyHostToDevice));

            using key_value = std::pair<key_type, value_type>;

            // Calculate expected results on host
            std::vector<key_value> expected(size);
            for(size_t i = 0; i < size; i++)
            {
                expected[i] = key_value(keys_input[i], values_input[i]);
            }
            for(size_t i = 0; i < segments_count; i++)
            {
                std::stable_sort(expected.begin() + offsets[i],
                                 expected.begin() + offsets[i + 1],
                                 test_utils::key_value_comparator<key_type,
                                                                  value_type,
                                                                  descending,
                                                                  start_bit,
                                                                  end_bit>());
            }
            std::vector<key_type>   keys_expected(size);
            std::vector<value_type> values_expected(size);
            for(size_t i = 0; i < size; i++)
            {
                keys_expected[i]   = expected[i].first;
                values_expected[i] = expected[i].second;
            }

            void*  d_temporary_storage     = nullptr;
            size_t temporary_storage_bytes = 0;
            HIP_CHECK(rocprim::segmented_radix_sort_pairs<config>(d_temporary_storage,
                                                                  temporary_storage_bytes,
                                                                  d_keys_input,
                                                                  d_keys_output,
                                                                  d_values_input,
                                                                  d_values_output,
                                                                  size,
                                                                  segments_count,
                                                                  d_offsets,
                                                                  d_offsets + 1,
                                                                  start_bit,
                                                                  end_bit));

            ASSERT_GT(temporary_storage_bytes, 0U);

            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_temporary_storage, temporary_storage_bytes));

            if(descending)
            {
                HIP_CHECK(rocprim::segmented_radix_sort_pairs_desc<config>(d_temporary_storage,
                                                                           temporary_storage_bytes,
                                                                           d_keys_input,
                                                                           d_keys_output,
                                                                           d_values_input,
                                                                           d_values_output,
                                                                           size,
                                                                           segments_count,
                                                                           d_offsets,
                                                                           d_offsets + 1,
                                                                           start_bit,
                                                                           end_bit,
                                                                           stream,
                                                                           debug_synchronous));
            }
            else
            {
                HIP_CHECK(rocprim::segmented_radix_sort_pairs<config>(d_temporary_storage,
                                                                      temporary_storage_bytes,
                                                                      d_keys_input,
                                                                      d_keys_output,
                                                                      d_values_input,
                                                                      d_values_output,
                                                                      size,
                                                                      segments_count,
                                                                      d_offsets,
                                                                      d_offsets + 1,
                                                                      start_bit,
                                                                      end_bit,
                                                                      stream,
                                                                      debug_synchronous));
            }

            std::vector<key_type> keys_output(size);
            HIP_CHECK(hipMemcpy(keys_output.data(),
                                d_keys_output,
                                size * sizeof(key_type),
                                hipMemcpyDeviceToHost));

            std::vector<value_type> values_output(size);
            HIP_CHECK(hipMemcpy(values_output.data(),
                                d_values_output,
                                size * sizeof(value_type),
                                hipMemcpyDeviceToHost));

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_keys_input));
            HIP_CHECK(hipFree(d_values_input));
            HIP_CHECK(hipFree(d_keys_output));
            HIP_CHECK(hipFree(d_values_output));
            HIP_CHECK(hipFree(d_offsets));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, keys_expected));
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(values_output, values_expected));
        }
    }
}

template<typename TestFixture>
inline void sort_keys_double_buffer()
{
    int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id = " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    using key_type                    = typename TestFixture::params::key_type;
    using config                      = typename TestFixture::params::config;
    constexpr bool         descending = TestFixture::params::descending;
    constexpr unsigned int start_bit  = TestFixture::params::start_bit;
    constexpr unsigned int end_bit    = TestFixture::params::end_bit;

    using offset_type = unsigned int;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    std::random_device         rd;
    std::default_random_engine gen(rd());

    std::uniform_int_distribution<size_t> segment_length_dis(
        TestFixture::params::min_segment_length,
        TestFixture::params::max_segment_length);

    for(size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        unsigned int seed_value
            = seed_index < random_seeds_count ? rand() : seeds[seed_index - random_seeds_count];
        SCOPED_TRACE(testing::Message() << "with seed = " << seed_value);

        for(size_t size : test_utils::get_sizes(seed_value))
        {
            SCOPED_TRACE(testing::Message() << "with size = " << size);

            // Generate data
            std::vector<key_type> keys_input;
            if(rocprim::is_floating_point<key_type>::value)
            {
                keys_input = test_utils::get_random_data<key_type>(size,
                                                                   static_cast<key_type>(-1000),
                                                                   static_cast<key_type>(+1000),
                                                                   seed_value);
            }
            else
            {
                keys_input
                    = test_utils::get_random_data<key_type>(size,
                                                            std::numeric_limits<key_type>::min(),
                                                            std::numeric_limits<key_type>::max(),
                                                            seed_index);
            }

            std::vector<offset_type> offsets;
            unsigned int             segments_count = 0;
            size_t                   offset         = 0;
            while(offset < size)
            {
                const size_t segment_length = segment_length_dis(gen);
                offsets.push_back(offset);
                segments_count++;
                offset += segment_length;
            }
            offsets.push_back(size);

            key_type* d_keys_input;
            key_type* d_keys_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input, size * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, size * sizeof(key_type)));
            HIP_CHECK(hipMemcpy(d_keys_input,
                                keys_input.data(),
                                size * sizeof(key_type),
                                hipMemcpyHostToDevice));

            offset_type* d_offsets;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_offsets,
                                                   (segments_count + 1) * sizeof(offset_type)));
            HIP_CHECK(hipMemcpy(d_offsets,
                                offsets.data(),
                                (segments_count + 1) * sizeof(offset_type),
                                hipMemcpyHostToDevice));

            // Calculate expected results on host
            std::vector<key_type> expected(keys_input);
            for(size_t i = 0; i < segments_count; i++)
            {
                std::stable_sort(
                    expected.begin() + offsets[i],
                    expected.begin() + offsets[i + 1],
                    test_utils::key_comparator<key_type, descending, start_bit, end_bit>());
            }

            rocprim::double_buffer<key_type> d_keys(d_keys_input, d_keys_output);

            size_t temporary_storage_bytes = 0;
            HIP_CHECK(rocprim::segmented_radix_sort_keys<config>(nullptr,
                                                                 temporary_storage_bytes,
                                                                 d_keys,
                                                                 size,
                                                                 segments_count,
                                                                 d_offsets,
                                                                 d_offsets + 1,
                                                                 start_bit,
                                                                 end_bit));

            ASSERT_GT(temporary_storage_bytes, 0U);

            void* d_temporary_storage;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_temporary_storage, temporary_storage_bytes));

            if(descending)
            {
                HIP_CHECK(rocprim::segmented_radix_sort_keys_desc<config>(d_temporary_storage,
                                                                          temporary_storage_bytes,
                                                                          d_keys,
                                                                          size,
                                                                          segments_count,
                                                                          d_offsets,
                                                                          d_offsets + 1,
                                                                          start_bit,
                                                                          end_bit,
                                                                          stream,
                                                                          debug_synchronous));
            }
            else
            {
                HIP_CHECK(rocprim::segmented_radix_sort_keys<config>(d_temporary_storage,
                                                                     temporary_storage_bytes,
                                                                     d_keys,
                                                                     size,
                                                                     segments_count,
                                                                     d_offsets,
                                                                     d_offsets + 1,
                                                                     start_bit,
                                                                     end_bit,
                                                                     stream,
                                                                     debug_synchronous));
            }

            std::vector<key_type> keys_output(size);
            HIP_CHECK(hipMemcpy(keys_output.data(),
                                d_keys.current(),
                                size * sizeof(key_type),
                                hipMemcpyDeviceToHost));

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_keys_input));
            HIP_CHECK(hipFree(d_keys_output));
            HIP_CHECK(hipFree(d_offsets));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, expected));
        }
    }
}

template<typename TestFixture>
inline void sort_pairs_double_buffer()
{
    int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id = " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    using key_type                    = typename TestFixture::params::key_type;
    using value_type                  = typename TestFixture::params::value_type;
    using config                      = typename TestFixture::params::config;
    constexpr bool         descending = TestFixture::params::descending;
    constexpr unsigned int start_bit  = TestFixture::params::start_bit;
    constexpr unsigned int end_bit    = TestFixture::params::end_bit;

    using offset_type = unsigned int;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    std::random_device         rd;
    std::default_random_engine gen(rd());

    std::uniform_int_distribution<size_t> segment_length_dis(
        TestFixture::params::min_segment_length,
        TestFixture::params::max_segment_length);

    for(size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        unsigned int seed_value
            = seed_index < random_seeds_count ? rand() : seeds[seed_index - random_seeds_count];
        SCOPED_TRACE(testing::Message() << "with seed = " << seed_value);

        for(size_t size : test_utils::get_sizes(seed_value))
        {
            SCOPED_TRACE(testing::Message() << "with size = " << size);

            // Generate data
            std::vector<key_type> keys_input;
            if(rocprim::is_floating_point<key_type>::value)
            {
                keys_input = test_utils::get_random_data<key_type>(size,
                                                                   static_cast<key_type>(-1000),
                                                                   static_cast<key_type>(+1000),
                                                                   seed_value);
            }
            else
            {
                keys_input
                    = test_utils::get_random_data<key_type>(size,
                                                            std::numeric_limits<key_type>::min(),
                                                            std::numeric_limits<key_type>::max(),
                                                            seed_index);
            }

            std::vector<offset_type> offsets;
            unsigned int             segments_count = 0;
            size_t                   offset         = 0;
            while(offset < size)
            {
                const size_t segment_length = segment_length_dis(gen);
                offsets.push_back(offset);
                segments_count++;
                offset += segment_length;
            }
            offsets.push_back(size);

            std::vector<value_type> values_input(size);
            test_utils::iota(values_input.begin(), values_input.end(), 0);

            key_type* d_keys_input;
            key_type* d_keys_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input, size * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, size * sizeof(key_type)));
            HIP_CHECK(hipMemcpy(d_keys_input,
                                keys_input.data(),
                                size * sizeof(key_type),
                                hipMemcpyHostToDevice));

            value_type* d_values_input;
            value_type* d_values_output;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_values_input, size * sizeof(value_type)));
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_values_output, size * sizeof(value_type)));
            HIP_CHECK(hipMemcpy(d_values_input,
                                values_input.data(),
                                size * sizeof(value_type),
                                hipMemcpyHostToDevice));

            offset_type* d_offsets;
            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_offsets,
                                                   (segments_count + 1) * sizeof(offset_type)));
            HIP_CHECK(hipMemcpy(d_offsets,
                                offsets.data(),
                                (segments_count + 1) * sizeof(offset_type),
                                hipMemcpyHostToDevice));

            using key_value = std::pair<key_type, value_type>;

            // Calculate expected results on host
            std::vector<key_value> expected(size);
            for(size_t i = 0; i < size; i++)
            {
                expected[i] = key_value(keys_input[i], values_input[i]);
            }
            for(size_t i = 0; i < segments_count; i++)
            {
                std::stable_sort(expected.begin() + offsets[i],
                                 expected.begin() + offsets[i + 1],
                                 test_utils::key_value_comparator<key_type,
                                                                  value_type,
                                                                  descending,
                                                                  start_bit,
                                                                  end_bit>());
            }
            std::vector<key_type>   keys_expected(size);
            std::vector<value_type> values_expected(size);
            for(size_t i = 0; i < size; i++)
            {
                keys_expected[i]   = expected[i].first;
                values_expected[i] = expected[i].second;
            }

            rocprim::double_buffer<key_type>   d_keys(d_keys_input, d_keys_output);
            rocprim::double_buffer<value_type> d_values(d_values_input, d_values_output);

            void*  d_temporary_storage     = nullptr;
            size_t temporary_storage_bytes = 0;
            HIP_CHECK(rocprim::segmented_radix_sort_pairs<config>(d_temporary_storage,
                                                                  temporary_storage_bytes,
                                                                  d_keys,
                                                                  d_values,
                                                                  size,
                                                                  segments_count,
                                                                  d_offsets,
                                                                  d_offsets + 1,
                                                                  start_bit,
                                                                  end_bit));

            ASSERT_GT(temporary_storage_bytes, 0U);

            HIP_CHECK(
                test_common_utils::hipMallocHelper(&d_temporary_storage, temporary_storage_bytes));

            if(descending)
            {
                HIP_CHECK(rocprim::segmented_radix_sort_pairs_desc<config>(d_temporary_storage,
                                                                           temporary_storage_bytes,
                                                                           d_keys,
                                                                           d_values,
                                                                           size,
                                                                           segments_count,
                                                                           d_offsets,
                                                                           d_offsets + 1,
                                                                           start_bit,
                                                                           end_bit,
                                                                           stream,
                                                                           debug_synchronous));
            }
            else
            {
                HIP_CHECK(rocprim::segmented_radix_sort_pairs<config>(d_temporary_storage,
                                                                      temporary_storage_bytes,
                                                                      d_keys,
                                                                      d_values,
                                                                      size,
                                                                      segments_count,
                                                                      d_offsets,
                                                                      d_offsets + 1,
                                                                      start_bit,
                                                                      end_bit,
                                                                      stream,
                                                                      debug_synchronous));
            }

            std::vector<key_type> keys_output(size);
            HIP_CHECK(hipMemcpy(keys_output.data(),
                                d_keys.current(),
                                size * sizeof(key_type),
                                hipMemcpyDeviceToHost));

            std::vector<value_type> values_output(size);
            HIP_CHECK(hipMemcpy(values_output.data(),
                                d_values.current(),
                                size * sizeof(value_type),
                                hipMemcpyDeviceToHost));

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_keys_input));
            HIP_CHECK(hipFree(d_keys_output));
            HIP_CHECK(hipFree(d_values_input));
            HIP_CHECK(hipFree(d_values_output));
            HIP_CHECK(hipFree(d_offsets));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, keys_expected));
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(values_output, values_expected));
        }
    }
}

#endif // TEST_DEVICE_SEGMENTED_RADIX_SORT_HPP_
