56fd68e7dd
CCCL (CUDA C++ Core Libraries) provides: - CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk) - Thrust: high-level parallel algorithms (transform_reduce, sort, scan) - libcudacxx: CUDA C++ standard library (atomics, barriers, memory) - cudax: experimental features (memory resources, allocators) - Tuning policies: per-SM hardware-specific algorithm parameters Competition optimization vectors mapped to CCCL: - Output TPS (83% weight): warp_reduce, block_reduce, device_topk - Input TPS (14% weight): device_scan, block_load, prefetch - Cache TPS (3% weight): prefix caching strategy patterns - Memory (0.9 util): pooled/cached/buddy allocators Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only) License: Apache-2.0
219 lines
8.2 KiB
C++
219 lines
8.2 KiB
C++
// SPDX-FileCopyrightText: Copyright (c) 2008-2013, NVIDIA Corporation. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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/*! \file reverse.h
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* \brief Reverses the order of a range
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
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# pragma GCC system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
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# pragma clang system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
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# pragma system_header
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#endif // no system header
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#include <thrust/detail/execution_policy.h>
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THRUST_NAMESPACE_BEGIN
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/*! \addtogroup reordering
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* \ingroup algorithms
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* \{
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*/
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/*! \p reverse reverses a range. That is: for every <tt>i</tt> such that
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* <tt>0 <= i <= (last - first) / 2</tt>, it exchanges <tt>*(first + i)</tt>
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* and <tt>*(last - (i + 1))</tt>.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the range to reverse.
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* \param last The end of the range to reverse.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam BidirectionalIterator is a model of <a
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* href="https://en.cppreference.com/w/cpp/iterator/bidirectional_iterator">Bidirectional Iterator</a> and \p
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* BidirectionalIterator is mutable.
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*
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* The following code snippet demonstrates how to use \p reverse to reverse a
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* \p device_vector of integers using the \p thrust::device execution policy for
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* parallelization:
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*
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* \code
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* #include <thrust/reverse.h>
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* #include <thrust/execution_policy.h>
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* ...
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* const int N = 6;
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* int data[N] = {0, 1, 2, 3, 4, 5};
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* thrust::device_vector<int> v(data, data + N);
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* thrust::reverse(thrust::device, v.begin(), v.end());
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* // v is now {5, 4, 3, 2, 1, 0}
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/reverse
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* \see \p reverse_copy
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* \see \p reverse_iterator
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename DerivedPolicy, typename BidirectionalIterator>
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_CCCL_HOST_DEVICE void reverse(const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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BidirectionalIterator first,
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BidirectionalIterator last);
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/*! \p reverse reverses a range. That is: for every <tt>i</tt> such that
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* <tt>0 <= i <= (last - first) / 2</tt>, it exchanges <tt>*(first + i)</tt>
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* and <tt>*(last - (i + 1))</tt>.
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*
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* \param first The beginning of the range to reverse.
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* \param last The end of the range to reverse.
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*
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* \tparam BidirectionalIterator is a model of <a
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* href="https://en.cppreference.com/w/cpp/iterator/bidirectional_iterator">Bidirectional Iterator</a> and \p
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* BidirectionalIterator is mutable.
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*
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* The following code snippet demonstrates how to use \p reverse to reverse a
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* \p device_vector of integers.
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*
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* \code
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* #include <thrust/reverse.h>
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* ...
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* const int N = 6;
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* int data[N] = {0, 1, 2, 3, 4, 5};
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* thrust::device_vector<int> v(data, data + N);
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* thrust::reverse(v.begin(), v.end());
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* // v is now {5, 4, 3, 2, 1, 0}
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/reverse
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* \see \p reverse_copy
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* \see \p reverse_iterator
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename BidirectionalIterator>
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void reverse(BidirectionalIterator first, BidirectionalIterator last);
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/*! \p reverse_copy differs from \p reverse only in that the reversed range
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* is written to a different output range, rather than inplace.
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*
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* \p reverse_copy copies elements from the range <tt>[first, last)</tt> to the
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* range <tt>[result, result + (last - first))</tt> such that the copy is a
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* reverse of the original range. Specifically: for every <tt>i</tt> such that
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* <tt>0 <= i < (last - first)</tt>, \p reverse_copy performs the assignment
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* <tt>*(result + (last - first) - i) = *(first + i)</tt>.
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*
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* The return value is <tt>result + (last - first))</tt>.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the range to reverse.
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* \param last The end of the range to reverse.
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* \param result The beginning of the output range.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam BidirectionalIterator is a model of <a
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* href="https://en.cppreference.com/w/cpp/iterator/bidirectional_iterator">Bidirectional Iterator</a>, and \p
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* BidirectionalIterator's \p value_type is convertible to \p OutputIterator's \p value_type. \tparam OutputIterator is
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* a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a>.
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*
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* \pre The range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
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*
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* The following code snippet demonstrates how to use \p reverse_copy to reverse
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* an input \p device_vector of integers to an output \p device_vector using the \p thrust::device
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* execution policy for parallelization:
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*
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* \code
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* #include <thrust/reverse.h>
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* #include <thrust/execution_policy.h>
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* ...
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* const int N = 6;
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* int data[N] = {0, 1, 2, 3, 4, 5};
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* thrust::device_vector<int> input(data, data + N);
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* thrust::device_vector<int> output(N);
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* thrust::reverse_copy(thrust::device, v.begin(), v.end(), output.begin());
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* // input is still {0, 1, 2, 3, 4, 5}
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* // output is now {5, 4, 3, 2, 1, 0}
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/reverse_copy
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* \see \p reverse
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* \see \p reverse_iterator
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename DerivedPolicy, typename BidirectionalIterator, typename OutputIterator>
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_CCCL_HOST_DEVICE OutputIterator reverse_copy(
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const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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BidirectionalIterator first,
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BidirectionalIterator last,
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OutputIterator result);
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/*! \p reverse_copy differs from \p reverse only in that the reversed range
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* is written to a different output range, rather than inplace.
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*
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* \p reverse_copy copies elements from the range <tt>[first, last)</tt> to the
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* range <tt>[result, result + (last - first))</tt> such that the copy is a
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* reverse of the original range. Specifically: for every <tt>i</tt> such that
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* <tt>0 <= i < (last - first)</tt>, \p reverse_copy performs the assignment
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* <tt>*(result + (last - first) - i) = *(first + i)</tt>.
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*
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* The return value is <tt>result + (last - first))</tt>.
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*
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* \param first The beginning of the range to reverse.
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* \param last The end of the range to reverse.
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* \param result The beginning of the output range.
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*
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* \tparam BidirectionalIterator is a model of <a
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* href="https://en.cppreference.com/w/cpp/iterator/bidirectional_iterator">Bidirectional Iterator</a>, and \p
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* BidirectionalIterator's \p value_type is convertible to \p OutputIterator's \p value_type. \tparam OutputIterator is
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* a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a>.
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*
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* \pre The range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
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*
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* The following code snippet demonstrates how to use \p reverse_copy to reverse
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* an input \p device_vector of integers to an output \p device_vector.
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*
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* \code
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* #include <thrust/reverse.h>
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* ...
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* const int N = 6;
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* int data[N] = {0, 1, 2, 3, 4, 5};
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* thrust::device_vector<int> input(data, data + N);
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* thrust::device_vector<int> output(N);
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* thrust::reverse_copy(v.begin(), v.end(), output.begin());
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* // input is still {0, 1, 2, 3, 4, 5}
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* // output is now {5, 4, 3, 2, 1, 0}
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/reverse_copy
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* \see \p reverse
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* \see \p reverse_iterator
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename BidirectionalIterator, typename OutputIterator>
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OutputIterator reverse_copy(BidirectionalIterator first, BidirectionalIterator last, OutputIterator result);
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/*!
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* \} end group reordering
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*/
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THRUST_NAMESPACE_END
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#include <thrust/detail/reverse.inl>
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