91 lines
3.4 KiB
C++
91 lines
3.4 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_BACKENDS_CPU_BACKEND_ANY_OF_H
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#define _LIBCPP___ALGORITHM_PSTL_BACKENDS_CPU_BACKEND_ANY_OF_H
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#include <__algorithm/any_of.h>
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#include <__algorithm/find_if.h>
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#include <__algorithm/pstl_backends/cpu_backends/backend.h>
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#include <__atomic/atomic.h>
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#include <__atomic/memory_order.h>
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#include <__config>
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#include <__functional/operations.h>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_execution_policy.h>
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#include <__utility/pair.h>
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#include <__utility/terminate_on_exception.h>
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#include <cstdint>
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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 _Index, class _Brick>
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_LIBCPP_HIDE_FROM_ABI bool __parallel_or(_Index __first, _Index __last, _Brick __f) {
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std::atomic<bool> __found(false);
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__par_backend::__parallel_for(__first, __last, [__f, &__found](_Index __i, _Index __j) {
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if (!__found.load(std::memory_order_relaxed) && __f(__i, __j)) {
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__found.store(true, std::memory_order_relaxed);
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__par_backend::__cancel_execution();
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}
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});
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return __found;
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}
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// TODO: check whether __simd_first() can be used here
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template <class _Index, class _DifferenceType, class _Pred>
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_LIBCPP_HIDE_FROM_ABI bool __simd_or(_Index __first, _DifferenceType __n, _Pred __pred) noexcept {
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_DifferenceType __block_size = 4 < __n ? 4 : __n;
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const _Index __last = __first + __n;
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while (__last != __first) {
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int32_t __flag = 1;
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_PSTL_PRAGMA_SIMD_REDUCTION(& : __flag)
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for (_DifferenceType __i = 0; __i < __block_size; ++__i)
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if (__pred(*(__first + __i)))
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__flag = 0;
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if (!__flag)
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return true;
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__first += __block_size;
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if (__last - __first >= __block_size << 1) {
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// Double the block _Size. Any unnecessary iterations can be amortized against work done so far.
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__block_size <<= 1;
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} else {
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__block_size = __last - __first;
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}
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}
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return false;
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}
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template <class _ExecutionPolicy, class _ForwardIterator, class _Predicate>
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_LIBCPP_HIDE_FROM_ABI bool
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__pstl_any_of(__cpu_backend_tag, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
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if constexpr (__is_parallel_execution_policy_v<_ExecutionPolicy> &&
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__has_random_access_iterator_category<_ForwardIterator>::value) {
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return std::__terminate_on_exception([&] {
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return std::__parallel_or(
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__first, __last, [&__pred](_ForwardIterator __brick_first, _ForwardIterator __brick_last) {
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return std::__pstl_any_of<__remove_parallel_policy_t<_ExecutionPolicy>>(
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__cpu_backend_tag{}, __brick_first, __brick_last, __pred);
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});
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});
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} else if constexpr (__is_unsequenced_execution_policy_v<_ExecutionPolicy> &&
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__has_random_access_iterator_category<_ForwardIterator>::value) {
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return std::__simd_or(__first, __last - __first, __pred);
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} else {
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return std::any_of(__first, __last, __pred);
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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_BACKENDS_CPU_BACKEND_ANY_OF_H
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