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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H |
| 10 | #define _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H |
| 11 | |
| 12 | #include <__config> |
| 13 | |
| 14 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 15 | # pragma GCC system_header |
| 16 | #endif |
| 17 | |
| 18 | _LIBCPP_PUSH_MACROS |
| 19 | #include <__undef_macros> |
| 20 | |
| 21 | #if _LIBCPP_STD_VER >= 17 |
| 22 | |
| 23 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 24 | namespace __pstl { |
| 25 | |
| 26 | // __cpu_traits |
| 27 | // |
| 28 | // This traits class encapsulates the basis operations for a CPU-based implementation of the PSTL. |
| 29 | // All the operations in the PSTL can be implemented from these basis operations, so a pure CPU backend |
| 30 | // only needs to customize these traits in order to get an implementation of the whole PSTL. |
| 31 | // |
| 32 | // Basis operations |
| 33 | // ================ |
| 34 | // |
| 35 | // template <class _RandomAccessIterator, class _Functor> |
| 36 | // optional<__empty> __for_each(_RandomAccessIterator __first, _RandomAccessIterator __last, _Functor __func); |
| 37 | // - __func must take a subrange of [__first, __last) that should be executed in serial |
| 38 | // |
| 39 | // template <class _Iterator, class _UnaryOp, class _Tp, class _BinaryOp, class _Reduction> |
| 40 | // optional<_Tp> __transform_reduce(_Iterator __first, _Iterator __last, _UnaryOp, _Tp __init, _BinaryOp, _Reduction); |
| 41 | // |
| 42 | // template <class _RandomAccessIterator1, |
| 43 | // class _RandomAccessIterator2, |
| 44 | // class _RandomAccessIterator3, |
| 45 | // class _Compare, |
| 46 | // class _LeafMerge> |
| 47 | // optional<_RandomAccessIterator3> __merge(_RandomAccessIterator1 __first1, |
| 48 | // _RandomAccessIterator1 __last1, |
| 49 | // _RandomAccessIterator2 __first2, |
| 50 | // _RandomAccessIterator2 __last2, |
| 51 | // _RandomAccessIterator3 __outit, |
| 52 | // _Compare __comp, |
| 53 | // _LeafMerge __leaf_merge); |
| 54 | // |
| 55 | // template <class _RandomAccessIterator, class _Comp, class _LeafSort> |
| 56 | // optional<__empty> __stable_sort(_RandomAccessIterator __first, |
| 57 | // _RandomAccessIterator __last, |
| 58 | // _Comp __comp, |
| 59 | // _LeafSort __leaf_sort); |
| 60 | // |
| 61 | // void __cancel_execution(); |
| 62 | // Cancel the execution of other jobs - they aren't needed anymore. This is not a binding request, |
| 63 | // some backends may not actually be able to cancel jobs. |
| 64 | // |
| 65 | // constexpr size_t __lane_size; |
| 66 | // Size of SIMD lanes. |
| 67 | // TODO: Merge this with __native_vector_size from __algorithm/simd_utils.h |
| 68 | // |
| 69 | // |
| 70 | // Exception handling |
| 71 | // ================== |
| 72 | // |
| 73 | // CPU backends are expected to report errors (i.e. failure to allocate) by returning a disengaged `optional` from their |
| 74 | // implementation. Exceptions shouldn't be used to report an internal failure-to-allocate, since all exceptions are |
| 75 | // turned into a program termination at the front-end level. When a backend returns a disengaged `optional` to the |
| 76 | // frontend, the frontend will turn that into a call to `std::__throw_bad_alloc();` to report the internal failure to |
| 77 | // the user. |
| 78 | |
| 79 | template <class _Backend> |
| 80 | struct __cpu_traits; |
| 81 | |
| 82 | } // namespace __pstl |
| 83 | _LIBCPP_END_NAMESPACE_STD |
| 84 | |
| 85 | #endif // _LIBCPP_STD_VER >= 17 |
| 86 | |
| 87 | _LIBCPP_POP_MACROS |
| 88 | |
| 89 | #endif // _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H |
| 90 |
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