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0001 //===----------------------------------------------------------------------===// 0002 // 0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 0004 // See https://llvm.org/LICENSE.txt for license information. 0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 0006 // 0007 //===----------------------------------------------------------------------===// 0008 0009 #ifndef _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H 0010 #define _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H 0011 0012 #include <__config> 0013 0014 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 0015 # pragma GCC system_header 0016 #endif 0017 0018 _LIBCPP_PUSH_MACROS 0019 #include <__undef_macros> 0020 0021 #if _LIBCPP_STD_VER >= 17 0022 0023 _LIBCPP_BEGIN_NAMESPACE_STD 0024 namespace __pstl { 0025 0026 // __cpu_traits 0027 // 0028 // This traits class encapsulates the basis operations for a CPU-based implementation of the PSTL. 0029 // All the operations in the PSTL can be implemented from these basis operations, so a pure CPU backend 0030 // only needs to customize these traits in order to get an implementation of the whole PSTL. 0031 // 0032 // Basis operations 0033 // ================ 0034 // 0035 // template <class _RandomAccessIterator, class _Functor> 0036 // optional<__empty> __for_each(_RandomAccessIterator __first, _RandomAccessIterator __last, _Functor __func); 0037 // - __func must take a subrange of [__first, __last) that should be executed in serial 0038 // 0039 // template <class _Iterator, class _UnaryOp, class _Tp, class _BinaryOp, class _Reduction> 0040 // optional<_Tp> __transform_reduce(_Iterator __first, _Iterator __last, _UnaryOp, _Tp __init, _BinaryOp, _Reduction); 0041 // 0042 // template <class _RandomAccessIterator1, 0043 // class _RandomAccessIterator2, 0044 // class _RandomAccessIterator3, 0045 // class _Compare, 0046 // class _LeafMerge> 0047 // optional<_RandomAccessIterator3> __merge(_RandomAccessIterator1 __first1, 0048 // _RandomAccessIterator1 __last1, 0049 // _RandomAccessIterator2 __first2, 0050 // _RandomAccessIterator2 __last2, 0051 // _RandomAccessIterator3 __outit, 0052 // _Compare __comp, 0053 // _LeafMerge __leaf_merge); 0054 // 0055 // template <class _RandomAccessIterator, class _Comp, class _LeafSort> 0056 // optional<__empty> __stable_sort(_RandomAccessIterator __first, 0057 // _RandomAccessIterator __last, 0058 // _Comp __comp, 0059 // _LeafSort __leaf_sort); 0060 // 0061 // void __cancel_execution(); 0062 // Cancel the execution of other jobs - they aren't needed anymore. This is not a binding request, 0063 // some backends may not actually be able to cancel jobs. 0064 // 0065 // constexpr size_t __lane_size; 0066 // Size of SIMD lanes. 0067 // TODO: Merge this with __native_vector_size from __algorithm/simd_utils.h 0068 // 0069 // 0070 // Exception handling 0071 // ================== 0072 // 0073 // CPU backends are expected to report errors (i.e. failure to allocate) by returning a disengaged `optional` from their 0074 // implementation. Exceptions shouldn't be used to report an internal failure-to-allocate, since all exceptions are 0075 // turned into a program termination at the front-end level. When a backend returns a disengaged `optional` to the 0076 // frontend, the frontend will turn that into a call to `std::__throw_bad_alloc();` to report the internal failure to 0077 // the user. 0078 0079 template <class _Backend> 0080 struct __cpu_traits; 0081 0082 } // namespace __pstl 0083 _LIBCPP_END_NAMESPACE_STD 0084 0085 #endif // _LIBCPP_STD_VER >= 17 0086 0087 _LIBCPP_POP_MACROS 0088 0089 #endif // _LIBCPP___PSTL_CPU_ALGOS_CPU_TRAITS_H
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