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libcudacxx/include/cuda/std/__mdspan/submdspan_extents.h
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| //===----------------------------------------------------------------------===// | ||
| // | ||
| // Part of libcu++, the C++ Standard Library for your entire system, | ||
| // under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef _LIBCUDACXX___MDSPAN_SUBMDSPAN_EXTENTS_H | ||
| #define _LIBCUDACXX___MDSPAN_SUBMDSPAN_EXTENTS_H | ||
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| #include <cuda/std/detail/__config> | ||
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| #if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC) | ||
| # pragma GCC system_header | ||
| #elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG) | ||
| # pragma clang system_header | ||
| #elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC) | ||
| # pragma system_header | ||
| #endif // no system header | ||
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| #include <cuda/std/__concepts/concept_macros.h> | ||
| #include <cuda/std/__concepts/convertible_to.h> | ||
| #include <cuda/std/__fwd/mdspan.h> | ||
| #include <cuda/std/__mdspan/concepts.h> | ||
| #include <cuda/std/__mdspan/extents.h> | ||
| #include <cuda/std/__mdspan/submdspan_helper.h> | ||
| #include <cuda/std/__tuple_dir/tuple_like.h> | ||
| #include <cuda/std/__tuple_dir/tuple_size.h> | ||
| #include <cuda/std/__type_traits/is_integral.h> | ||
| #include <cuda/std/__type_traits/is_same.h> | ||
| #include <cuda/std/__type_traits/is_signed.h> | ||
| #include <cuda/std/__type_traits/is_unsigned.h> | ||
| #include <cuda/std/__utility/integer_sequence.h> | ||
| #include <cuda/std/array> | ||
| #include <cuda/std/tuple> | ||
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| #if _CCCL_STD_VER >= 2014 | ||
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| _LIBCUDACXX_BEGIN_NAMESPACE_STD | ||
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| // [mdspan.sub.extents] | ||
| // [mdspan.sub.extents-4.2.2] | ||
| template <class _Extents, class _SliceType> | ||
| _CCCL_CONCEPT __subextents_is_index_pair = _CCCL_REQUIRES_EXPR((_Extents, _SliceType))( | ||
| requires(__index_pair_like<_SliceType, typename _Extents::index_type>), | ||
| requires(__integral_constant_like<tuple_element_t<0, _SliceType>>), | ||
| requires(__integral_constant_like<tuple_element_t<1, _SliceType>>)); | ||
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| // [mdspan.sub.extents-4.2.3] | ||
| template <class _Extents, class _SliceType> | ||
| _CCCL_CONCEPT __subextents_is_strided_slice_zero_extent = _CCCL_REQUIRES_EXPR((_Extents, _SliceType))( | ||
| requires(__is_strided_slice<_SliceType>), | ||
| requires(__integral_constant_like<typename _SliceType::extent_type>), | ||
| requires(typename _SliceType::extent_type() == 0)); | ||
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| // [mdspan.sub.extents-4.2.4] | ||
| template <class _Extents, class _SliceType> | ||
| _CCCL_CONCEPT __subextents_is_strided_slice = _CCCL_REQUIRES_EXPR((_Extents, _SliceType))( | ||
| requires(__is_strided_slice<_SliceType>), | ||
| requires(__integral_constant_like<typename _SliceType::extent_type>), | ||
| requires(__integral_constant_like<typename _SliceType::stride_type>)); | ||
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| struct __get_subextent | ||
| { | ||
| template <class _Extents, size_t _SliceIndex, class _SliceType> | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI static constexpr size_t __get_static_subextents() noexcept | ||
| { | ||
| // [mdspan.sub.extents-4.2.1] | ||
| if constexpr (convertible_to<_SliceType, full_extent_t>) | ||
| { | ||
| return _Extents::static_extent(_SliceIndex); | ||
| } | ||
| // [mdspan.sub.extents-4.2.2] | ||
| else if constexpr (__subextents_is_index_pair<_Extents, _SliceType>) | ||
| { | ||
| return _CUDA_VSTD::__de_ice(tuple_element_t<1, _SliceType>()) | ||
| - _CUDA_VSTD::__de_ice(tuple_element_t<0, _SliceType>()); | ||
| } | ||
| // [mdspan.sub.extents-4.2.3] | ||
| else if constexpr (__subextents_is_strided_slice_zero_extent<_Extents, _SliceType>) | ||
| { | ||
| return 0; | ||
| } | ||
| // [mdspan.sub.extents-4.2.4] | ||
| else if constexpr (__subextents_is_strided_slice<_Extents, _SliceType>) | ||
| { | ||
| return 1 | ||
| + (_CUDA_VSTD::__de_ice(_SliceType::extent_type()) - 1) / _CUDA_VSTD::__de_ice(_SliceType::stride_type()); | ||
| } | ||
| // [mdspan.sub.extents-4.2.5] | ||
| else | ||
| { | ||
| return dynamic_extent; | ||
| } | ||
| _CCCL_UNREACHABLE(); | ||
| } | ||
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| template <size_t _SliceIndex, class _Extent, class... _Slices> | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI static constexpr typename _Extent::index_type | ||
| __get_dynamic_subextents(const _Extent& __src, _Slices... __slices) noexcept | ||
| { | ||
| using _SliceType = __get_slice_type<_SliceIndex, _Slices...>; | ||
| // [mdspan.sub.extents-5.1] | ||
| if constexpr (__is_strided_slice<_SliceType>) | ||
| { | ||
| _SliceType& __slice = _CUDA_VSTD::__get_slice_at<_SliceIndex>(__slices...); | ||
| return __slice.extent == 0 | ||
| ? 0 | ||
| : 1 + (_CUDA_VSTD::__de_ice(__slice.extent) - 1) / _CUDA_VSTD::__de_ice(__slice.stride); | ||
| } | ||
| // [mdspan.sub.extents-5.2] | ||
| else | ||
| { | ||
| return _CUDA_VSTD::__last_extent_from_slice<_SliceIndex>(__src, __slices...) | ||
| - _CUDA_VSTD::__first_extent_from_slice<typename _Extent::index_type, _SliceIndex>(__slices...); | ||
| } | ||
| _CCCL_UNREACHABLE(); | ||
| } | ||
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| template <class _IndexType, class... _Slices> | ||
| static constexpr auto __map_rank = _CUDA_VSTD::__map_rank<_IndexType, _Slices...>(); | ||
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| template <class _Extent, class... _Slices, size_t... _SliceIndices, size_t _SliceIndex, size_t... _Remaining> | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI constexpr auto | ||
| __impl(index_sequence<_SliceIndices...>, | ||
| index_sequence<_SliceIndex, _Remaining...>, | ||
| const _Extent& __src, | ||
| _Slices... __slices) noexcept | ||
| { | ||
| using _IndexType = typename _Extent::index_type; | ||
| using _SliceType = __get_slice_type<_SliceIndex, _Slices...>; | ||
| if constexpr (convertible_to<_SliceType, typename _Extent::index_type>) | ||
| { | ||
| return __impl(index_sequence<_SliceIndices...>{}, index_sequence<_Remaining...>{}, __src, __slices...); | ||
| } | ||
| else | ||
| { | ||
| return __impl( | ||
| index_sequence<_SliceIndices..., _SliceIndex>{}, index_sequence<_Remaining...>{}, __src, __slices...); | ||
| } | ||
| _CCCL_UNREACHABLE(); | ||
| } | ||
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| template <class _Extent, class... _Slices, size_t... _SliceIndices> | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI constexpr auto | ||
| __impl(index_sequence<_SliceIndices...>, index_sequence<>, const _Extent& __src, _Slices... __slices) noexcept | ||
| { | ||
| using _IndexType = typename _Extent::index_type; | ||
| using _SubExtents = | ||
| extents<_IndexType, | ||
| __get_static_subextents<_Extent, _SliceIndices, __get_slice_type<_SliceIndices, _Slices...>>()...>; | ||
| return _SubExtents{__get_dynamic_subextents<_SliceIndices>(__src, __slices...)...}; | ||
| } | ||
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| template <class _Extent, class... _Slices> | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI constexpr auto operator()(const _Extent& __src, _Slices... __slices) noexcept | ||
| { | ||
| return __impl(index_sequence<>{}, _CUDA_VSTD::index_sequence_for<_Slices...>(), __src, __slices...); | ||
| } | ||
| }; | ||
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| template <class _IndexType, class _SliceType> | ||
| _CCCL_INLINE_VAR constexpr bool __is_valid_subextents = | ||
| convertible_to<_SliceType, _IndexType> || __index_pair_like<_SliceType, _IndexType> | ||
| || _CCCL_TRAIT(is_convertible, _SliceType, full_extent_t) || __is_strided_slice<_SliceType>; | ||
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| _CCCL_TEMPLATE(class _Extents, class... _Slices) | ||
| _CCCL_REQUIRES((_Extents::rank() == sizeof...(_Slices))) | ||
| _CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI constexpr auto submdspan_extents(const _Extents& __src, _Slices... __slices) | ||
| { | ||
| static_assert(_CCCL_FOLD_AND((__is_valid_subextents<typename _Extents::index_type, _Slices>) ), | ||
| "[mdspan.sub.extents] For each rank index k of src.extents(), exactly one of the following is true:"); | ||
| return __get_subextent{}(__src, __slices...); | ||
| } | ||
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| template <class _Extents, class... _Slices> | ||
| using __get_subextents_t = | ||
| decltype(_CUDA_VSTD::submdspan_extents(_CUDA_VSTD::declval<_Extents>(), _CUDA_VSTD::declval<_Slices>()...)); | ||
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| _LIBCUDACXX_END_NAMESPACE_STD | ||
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| #endif // _CCCL_STD_VER >= 2014 | ||
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| #endif // _LIBCUDACXX___MDSPAN_SUBMDSPAN_EXTENTS_H |
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