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This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_EXPERIMENTAL_SIMD
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#define _LIBCPP_EXPERIMENTAL_SIMD
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/*
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experimental/simd synopsis
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namespace std::experimental {
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inline namespace parallelism_v2 {
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namespace simd_abi {
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using scalar = see below;
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template<int N> using fixed_size = see below;
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template<class T> inline constexpr int max_fixed_size = implementation-defined;
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template<class T> using compatible = implementation-defined;
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template<class T> using native = implementation-defined;
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template<class T, size_t N, class... Abis> struct deduce { using type = see below; };
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template<class T, size_t N, class... Abis> using deduce_t =
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typename deduce<T, N, Abis...>::type;
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} // namespace simd_abi
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// class template simd [simd.class]
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template <class T, class Abi = simd_abi::compatible<T>> class simd;
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template <class T> using native_simd = simd<T, simd_abi::native<T>>;
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template <class T, int N> using fixed_size_simd = simd<T, simd_abi::fixed_size<N>>;
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// class template simd_mask [simd.mask.class]
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template <class T, class Abi = simd_abi::compatible<T>> class simd_mask;
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template <class T> using native_simd_mask = simd_mask<T, simd_abi::native<T>>;
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template <class T, int N> using fixed_size_simd_mask = simd_mask<T, simd_abi::fixed_size<N>>;
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// memory alignment
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struct element_aligned_tag {};
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struct vector_aligned_tag {};
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template <size_t> struct overaligned_tag {};
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inline constexpr element_aligned_tag element_aligned{};
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inline constexpr vector_aligned_tag vector_aligned{};
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template <size_t N> inline constexpr overaligned_tag<N> overaligned{};
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// traits [simd.traits]
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template<class T> struct is_abi_tag;
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template<class T> inline constexpr bool is_abi_tag_v = is_abi_tag<T>::value;
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template <class T> struct is_simd;
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template <class T> inline constexpr bool is_simd_v = is_simd<T>::value;
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template <class T> struct is_simd_mask;
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template <class T> inline constexpr bool is_simd_mask_v = is_simd_mask<T>::value;
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template<class T> struct is_simd_flag_type;
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template<class T> inline constexpr bool is_simd_flag_type_v = is_simd_flag_type<T>::value;
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template<class T, class Abi = simd_abi::compatible<T>> struct simd_size;
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template<class T, class Abi = simd_abi::compatible<T>>
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inline constexpr size_t simd_size_v = simd_size<T,Abi>::value;
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template<class T, class U = typename T::value_type> struct memory_alignment;
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template<class T, class U = typename T::value_type>
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inline constexpr size_t memory_alignment_v = memory_alignment<T,U>::value;
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} // namespace parallelism_v2
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} // namespace std::experimental
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*/
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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 __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/experimental/simd>
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#else
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# include <__config>
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# include <experimental/__simd/aligned_tag.h>
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# include <experimental/__simd/declaration.h>
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# include <experimental/__simd/reference.h>
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# include <experimental/__simd/scalar.h>
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# include <experimental/__simd/simd.h>
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# include <experimental/__simd/simd_mask.h>
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# include <experimental/__simd/traits.h>
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# include <experimental/__simd/vec_ext.h>
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# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <cstddef>
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# endif
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif /* _LIBCPP_EXPERIMENTAL_SIMD */
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