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8e2d09c339
This allows backends to customize arbitrary parallel algorithms, which was requested pretty often. Reviewed By: #libc, ldionne Spies: arichardson, miyuki, crtrott, dalg24, __simt__, philnik, libcxx-commits Differential Revision: https://reviews.llvm.org/D149686
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_PSTL_BACKEND_H
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#define _LIBCPP___ALGORITHM_PSTL_BACKEND_H
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#include <__algorithm/pstl_backends/cpu_backend.h>
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#include <__config>
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#include <execution>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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/*
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TODO: Documentation of how backends work
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A PSTL parallel backend is a tag type to which the following functions are associated, at minimum:
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template <class _ExecutionPolicy, class _Iterator, class _Func>
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void __pstl_for_each(_Backend, _ExecutionPolicy&&, _Iterator __first, _Iterator __last, _Func __f);
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// TODO: Complete this list
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The following functions are optional but can be provided. If provided, they are used by the corresponding
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algorithms, otherwise they are implemented in terms of other algorithms. If none of the optional algorithms are
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implemented, all the algorithms will eventually forward to the basis algorithms listed above:
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template <class _ExecutionPolicy, class _Iterator, class _Size, class _Func>
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void __pstl_for_each_n(_Backend, _ExecutionPolicy&&, _Iterator __first, _Size __n, _Func __f);
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// TODO: Complete this list
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*/
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template <class _ExecutionPolicy>
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struct __select_backend;
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template <>
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struct __select_backend<std::execution::sequenced_policy> {
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using type = __cpu_backend_tag;
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};
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# if _LIBCPP_STD_VER >= 20
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template <>
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struct __select_backend<std::execution::unsequenced_policy> {
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using type = __cpu_backend_tag;
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};
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# endif
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# if defined(_PSTL_CPU_BACKEND_SERIAL)
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template <>
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struct __select_backend<std::execution::parallel_policy> {
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using type = __cpu_backend_tag;
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};
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template <>
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struct __select_backend<std::execution::parallel_unsequenced_policy> {
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using type = __cpu_backend_tag;
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};
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# else
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// ...New vendors can add parallel backends here...
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# error "Invalid choice of a PSTL parallel backend"
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# endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___ALGORITHM_PSTL_BACKEND_H
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