mirror of git://gcc.gnu.org/git/gcc.git
112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
// -*- C++ -*-
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//===-- execution_impl.h --------------------------------------------------===//
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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 _PSTL_EXECUTION_IMPL_H
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#define _PSTL_EXECUTION_IMPL_H
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#include <iterator>
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#include <type_traits>
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#include "execution_defs.h"
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namespace __pstl
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{
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namespace __internal
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{
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#if __glibcxx_concepts
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template<typename _Iter>
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concept __is_random_access_iter
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= std::is_base_of_v<std::random_access_iterator_tag,
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std::__iter_category_t<_Iter>>
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|| std::random_access_iterator<_Iter>;
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template <typename... _IteratorTypes>
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using __are_random_access_iterators
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= std::bool_constant<(__is_random_access_iter<std::remove_cvref_t<_IteratorTypes>> && ...)>;
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#else
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template <typename... _IteratorTypes>
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using __are_random_access_iterators
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= std::__and_<
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std::is_base_of<std::random_access_iterator_tag,
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std::__iter_category_t<std::__remove_cvref_t<_IteratorTypes>>>...
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>;
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#endif
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struct __serial_backend_tag
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{
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};
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struct __tbb_backend_tag
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{
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};
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struct __openmp_backend_tag
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{
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};
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#if defined(_PSTL_PAR_BACKEND_TBB)
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using __par_backend_tag = __tbb_backend_tag;
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#elif defined(_PSTL_PAR_BACKEND_OPENMP)
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using __par_backend_tag = __openmp_backend_tag;
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#elif defined(_PSTL_PAR_BACKEND_SERIAL)
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using __par_backend_tag = __serial_backend_tag;
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#else
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# error "A parallel backend must be specified";
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#endif
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template <class _IsVector>
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struct __serial_tag
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{
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using __is_vector = _IsVector;
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};
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template <class _IsVector>
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struct __parallel_tag
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{
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using __is_vector = _IsVector;
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// backend tag can be change depending on
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// TBB availability in the environment
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using __backend_tag = __par_backend_tag;
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};
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template <class _IsVector, class... _IteratorTypes>
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using __tag_type = typename std::conditional<__internal::__are_random_access_iterators<_IteratorTypes...>::value,
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__parallel_tag<_IsVector>, __serial_tag<_IsVector>>::type;
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template <class... _IteratorTypes>
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__serial_tag</*_IsVector = */ std::false_type>
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__select_backend(__pstl::execution::sequenced_policy, _IteratorTypes&&...)
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{
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return {};
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}
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template <class... _IteratorTypes>
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__serial_tag<__internal::__are_random_access_iterators<_IteratorTypes...>>
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__select_backend(__pstl::execution::unsequenced_policy, _IteratorTypes&&...)
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{
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return {};
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}
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template <class... _IteratorTypes>
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__tag_type</*_IsVector = */ std::false_type, _IteratorTypes...>
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__select_backend(__pstl::execution::parallel_policy, _IteratorTypes&&...)
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{
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return {};
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}
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template <class... _IteratorTypes>
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__tag_type<__internal::__are_random_access_iterators<_IteratorTypes...>, _IteratorTypes...>
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__select_backend(__pstl::execution::parallel_unsequenced_policy, _IteratorTypes&&...)
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{
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return {};
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}
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} // namespace __internal
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} // namespace __pstl
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#endif /* _PSTL_EXECUTION_IMPL_H */
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