e7e3711885
This removes the need for a custom libc++ build to have a basic set of PSTL algorithms. Reviewed By: ldionne, #libc Spies: miyuki, libcxx-commits, arichardson Differential Revision: https://reviews.llvm.org/D149624
109 lines
4.3 KiB
C++
109 lines
4.3 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_FIND_H
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#define _LIBCPP___ALGORITHM_PSTL_FIND_H
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#include <__algorithm/comp.h>
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#include <__algorithm/find.h>
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#include <__config>
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#include <__pstl/internal/parallel_impl.h>
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#include <__pstl/internal/unseq_backend_simd.h>
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#include <__type_traits/is_execution_policy.h>
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#include <__type_traits/remove_cvref.h>
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#include <__utility/terminate_on_exception.h>
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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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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Tp,
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enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardIterator
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find(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
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if constexpr (__is_parallel_execution_policy_v<_ExecutionPolicy> &&
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__is_cpp17_random_access_iterator<_ForwardIterator>::value) {
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return std::__terminate_on_exception([&] {
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return __pstl::__internal::__parallel_find(
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__pstl::__internal::__par_backend_tag{},
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__policy,
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__first,
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__last,
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[&__policy, &__value](_ForwardIterator __brick_first, _ForwardIterator __brick_last) {
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return std::find(std::__remove_parallel_policy(__policy), __brick_first, __brick_last, __value);
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},
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less<>{},
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true);
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});
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} else if constexpr (__is_unsequenced_execution_policy_v<_ExecutionPolicy> &&
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__is_cpp17_random_access_iterator<_ForwardIterator>::value) {
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using __diff_t = __iter_diff_t<_ForwardIterator>;
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return __pstl::__unseq_backend::__simd_first(
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__first, __diff_t(0), __last - __first, [&__value](_ForwardIterator __iter, __diff_t __i) {
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return __iter[__i] == __value;
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});
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} else {
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return std::find(__first, __last, __value);
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}
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Predicate,
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enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardIterator
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find_if(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
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if constexpr (__is_parallel_execution_policy_v<_ExecutionPolicy> &&
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__is_cpp17_random_access_iterator<_ForwardIterator>::value) {
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return std::__terminate_on_exception([&] {
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return __pstl::__internal::__parallel_find(
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__pstl::__internal::__par_backend_tag{},
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__policy,
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__first,
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__last,
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[&__policy, &__pred](_ForwardIterator __brick_first, _ForwardIterator __brick_last) {
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return std::find_if(std::__remove_parallel_policy(__policy), __brick_first, __brick_last, __pred);
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},
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less<>{},
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true);
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});
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} else if constexpr (__is_unsequenced_execution_policy_v<_ExecutionPolicy> &&
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__is_cpp17_random_access_iterator<_ForwardIterator>::value) {
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using __diff_t = __iter_diff_t<_ForwardIterator>;
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return __pstl::__unseq_backend::__simd_first(
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__first, __diff_t(0), __last - __first, [&__pred](_ForwardIterator __iter, __diff_t __i) {
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return __pred(__iter[__i]);
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});
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} else {
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return std::find_if(__first, __last, __pred);
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}
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Predicate,
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enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardIterator
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find_if_not(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
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return std::find_if(__policy, __first, __last, [&](__iter_reference<_ForwardIterator> __value) {
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return !__pred(__value);
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});
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}
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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_FIND_H
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