| /****************************************************************************** | |
| * Copyright (c) 2011, Duane Merrill. All rights reserved. | |
| * Copyright (c) 2011-2018, 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; | |
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| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| * | |
| ******************************************************************************/ | |
| /** | |
| * @file | |
| * Thread utilities for sequential prefix scan over statically-sized array types | |
| */ | |
| #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/thread/thread_operators.cuh> | |
| CUB_NAMESPACE_BEGIN | |
| /// Internal namespace (to prevent ADL mishaps between static functions when mixing different CUB installations) | |
| namespace internal { | |
| /** | |
| * @addtogroup UtilModule | |
| * @{ | |
| */ | |
| /** | |
| * @name Sequential prefix scan over statically-sized array types | |
| * @{ | |
| */ | |
| /** | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T ThreadScanExclusive(T inclusive, | |
| T exclusive, | |
| T *input, | |
| T *output, | |
| ScanOp scan_op, | |
| Int2Type<LENGTH> /*length*/) | |
| { | |
| #pragma unroll | |
| for (int i = 0; i < LENGTH; ++i) | |
| { | |
| inclusive = scan_op(exclusive, input[i]); | |
| output[i] = exclusive; | |
| exclusive = inclusive; | |
| } | |
| return inclusive; | |
| } | |
| /** | |
| * @brief Perform a sequential exclusive prefix scan over @p LENGTH elements of | |
| * the @p input array, seeded with the specified @p prefix. The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| * | |
| * @param[in] prefix | |
| * Prefix to seed scan with | |
| * | |
| * @param[in] apply_prefix | |
| * Whether or not the calling thread should apply its prefix. | |
| * If not, the first output element is undefined. | |
| * (Handy for preventing thread-0 from applying a prefix.) | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T | |
| ThreadScanExclusive(T *input, T *output, ScanOp scan_op, T prefix, bool apply_prefix = true) | |
| { | |
| T inclusive = input[0]; | |
| if (apply_prefix) | |
| { | |
| inclusive = scan_op(prefix, inclusive); | |
| } | |
| output[0] = prefix; | |
| T exclusive = inclusive; | |
| return ThreadScanExclusive(inclusive, exclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>()); | |
| } | |
| /** | |
| * @brief Perform a sequential exclusive prefix scan over the statically-sized | |
| * @p input array, seeded with the specified @p prefix. The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * <b>[inferred]</b> LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| * | |
| * @param[in] prefix | |
| * Prefix to seed scan with | |
| * | |
| * @param[in] apply_prefix | |
| * Whether or not the calling thread should apply its prefix. | |
| * (Handy for preventing thread-0 from applying a prefix.) | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T ThreadScanExclusive(T (&input)[LENGTH], | |
| T (&output)[LENGTH], | |
| ScanOp scan_op, | |
| T prefix, | |
| bool apply_prefix = true) | |
| { | |
| return ThreadScanExclusive<LENGTH>((T *)input, (T *)output, scan_op, prefix, apply_prefix); | |
| } | |
| /** | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T | |
| ThreadScanInclusive(T inclusive, T *input, T *output, ScanOp scan_op, Int2Type<LENGTH> /*length*/) | |
| { | |
| #pragma unroll | |
| for (int i = 0; i < LENGTH; ++i) | |
| { | |
| inclusive = scan_op(inclusive, input[i]); | |
| output[i] = inclusive; | |
| } | |
| return inclusive; | |
| } | |
| /** | |
| * @brief Perform a sequential inclusive prefix scan over | |
| * @p LENGTH elements of the @p input array. The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T ThreadScanInclusive(T *input, T *output, ScanOp scan_op) | |
| { | |
| T inclusive = input[0]; | |
| output[0] = inclusive; | |
| // Continue scan | |
| return ThreadScanInclusive(inclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>()); | |
| } | |
| /** | |
| * @brief Perform a sequential inclusive prefix scan over the | |
| * statically-sized @p input array. The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * <b>[inferred]</b> LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T ThreadScanInclusive(T (&input)[LENGTH], | |
| T (&output)[LENGTH], | |
| ScanOp scan_op) | |
| { | |
| return ThreadScanInclusive<LENGTH>((T*) input, (T*) output, scan_op); | |
| } | |
| /** | |
| * @brief Perform a sequential inclusive prefix scan over | |
| * @p LENGTH elements of the @p input array, seeded with the | |
| * specified @p prefix. The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| * | |
| * @param[in] prefix | |
| * Prefix to seed scan with | |
| * | |
| * @param[in] apply_prefix | |
| * Whether or not the calling thread should apply its prefix. | |
| * (Handy for preventing thread-0 from applying a prefix.) | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T | |
| ThreadScanInclusive(T *input, T *output, ScanOp scan_op, T prefix, bool apply_prefix = true) | |
| { | |
| T inclusive = input[0]; | |
| if (apply_prefix) | |
| { | |
| inclusive = scan_op(prefix, inclusive); | |
| } | |
| output[0] = inclusive; | |
| // Continue scan | |
| return ThreadScanInclusive(inclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>()); | |
| } | |
| /** | |
| * @brief Perform a sequential inclusive prefix scan over the | |
| * statically-sized @p input array, seeded with the specified @p prefix. | |
| * The aggregate is returned. | |
| * | |
| * @tparam LENGTH | |
| * <b>[inferred]</b> LengthT of @p input and @p output arrays | |
| * | |
| * @tparam T | |
| * <b>[inferred]</b> The data type to be scanned. | |
| * | |
| * @tparam ScanOp | |
| * <b>[inferred]</b> Binary scan operator type having member | |
| * <tt>T operator()(const T &a, const T &b)</tt> | |
| * | |
| * @param[in] input | |
| * Input array | |
| * | |
| * @param[out] output | |
| * Output array (may be aliased to @p input) | |
| * | |
| * @param[in] scan_op | |
| * Binary scan operator | |
| * | |
| * @param[in] prefix | |
| * Prefix to seed scan with | |
| * | |
| * @param[in] apply_prefix | |
| * Whether or not the calling thread should apply its prefix. | |
| * (Handy for preventing thread-0 from applying a prefix.) | |
| */ | |
| template <int LENGTH, typename T, typename ScanOp> | |
| __device__ __forceinline__ T ThreadScanInclusive(T (&input)[LENGTH], | |
| T (&output)[LENGTH], | |
| ScanOp scan_op, | |
| T prefix, | |
| bool apply_prefix = true) | |
| { | |
| return ThreadScanInclusive<LENGTH>((T*) input, (T*) output, scan_op, prefix, apply_prefix); | |
| } | |
| //@} end member group | |
| /** @} */ // end group UtilModule | |
| } // internal namespace | |
| CUB_NAMESPACE_END | |