cub/warp/warp_merge_sort.cuh
File members: cub/warp/warp_merge_sort.cuh
/******************************************************************************
* Copyright (c) 2011-2021, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/
#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/block/block_merge_sort.cuh>
#include <cub/util_ptx.cuh>
#include <cub/util_type.cuh>
#include <cuda/std/type_traits>
CUB_NAMESPACE_BEGIN
template <typename KeyT,
int ITEMS_PER_THREAD,
int LOGICAL_WARP_THREADS = CUB_WARP_THREADS(0),
typename ValueT = NullType,
int LEGACY_PTX_ARCH = 0>
class WarpMergeSort
: public BlockMergeSortStrategy<KeyT,
ValueT,
LOGICAL_WARP_THREADS,
ITEMS_PER_THREAD,
WarpMergeSort<KeyT, ITEMS_PER_THREAD, LOGICAL_WARP_THREADS, ValueT>>
{
private:
static constexpr bool IS_ARCH_WARP = LOGICAL_WARP_THREADS == CUB_WARP_THREADS(0);
static constexpr bool KEYS_ONLY = ::cuda::std::is_same<ValueT, NullType>::value;
static constexpr int TILE_SIZE = ITEMS_PER_THREAD * LOGICAL_WARP_THREADS;
using BlockMergeSortStrategyT =
BlockMergeSortStrategy<KeyT, ValueT, LOGICAL_WARP_THREADS, ITEMS_PER_THREAD, WarpMergeSort>;
const unsigned int warp_id;
const unsigned int member_mask;
public:
WarpMergeSort() = delete;
_CCCL_DEVICE _CCCL_FORCEINLINE WarpMergeSort(typename BlockMergeSortStrategyT::TempStorage& temp_storage)
: BlockMergeSortStrategyT(temp_storage, IS_ARCH_WARP ? LaneId() : (LaneId() % LOGICAL_WARP_THREADS))
, warp_id(IS_ARCH_WARP ? 0 : (LaneId() / LOGICAL_WARP_THREADS))
, member_mask(WarpMask<LOGICAL_WARP_THREADS>(warp_id))
{}
_CCCL_DEVICE _CCCL_FORCEINLINE unsigned int get_member_mask() const
{
return member_mask;
}
private:
_CCCL_DEVICE _CCCL_FORCEINLINE void SyncImplementation() const
{
WARP_SYNC(member_mask);
}
friend BlockMergeSortStrategyT;
};
CUB_NAMESPACE_END