14824e7fdSDimitry Andric // -*- C++ -*- 24824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 34824e7fdSDimitry Andric // 44824e7fdSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 54824e7fdSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 64824e7fdSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 74824e7fdSDimitry Andric // 84824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 94824e7fdSDimitry Andric 104824e7fdSDimitry Andric #ifndef _LIBCPP___BIT_BYTESWAP_H 114824e7fdSDimitry Andric #define _LIBCPP___BIT_BYTESWAP_H 124824e7fdSDimitry Andric 134824e7fdSDimitry Andric #include <__concepts/arithmetic.h> 144824e7fdSDimitry Andric #include <__config> 154824e7fdSDimitry Andric #include <cstdint> 164824e7fdSDimitry Andric 174824e7fdSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 184824e7fdSDimitry Andric # pragma GCC system_header 194824e7fdSDimitry Andric #endif 204824e7fdSDimitry Andric 214824e7fdSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 224824e7fdSDimitry Andric 23*06c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 23 244824e7fdSDimitry Andric 254824e7fdSDimitry Andric template <integral _Tp> byteswap(_Tp __val)26*06c3fb27SDimitry Andric_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Tp byteswap(_Tp __val) noexcept { 274824e7fdSDimitry Andric if constexpr (sizeof(_Tp) == 1) { 284824e7fdSDimitry Andric return __val; 294824e7fdSDimitry Andric } else if constexpr (sizeof(_Tp) == 2) { 304824e7fdSDimitry Andric return __builtin_bswap16(__val); 314824e7fdSDimitry Andric } else if constexpr (sizeof(_Tp) == 4) { 324824e7fdSDimitry Andric return __builtin_bswap32(__val); 334824e7fdSDimitry Andric } else if constexpr (sizeof(_Tp) == 8) { 344824e7fdSDimitry Andric return __builtin_bswap64(__val); 354824e7fdSDimitry Andric # ifndef _LIBCPP_HAS_NO_INT128 364824e7fdSDimitry Andric } else if constexpr (sizeof(_Tp) == 16) { 374824e7fdSDimitry Andric # if __has_builtin(__builtin_bswap128) 384824e7fdSDimitry Andric return __builtin_bswap128(__val); 394824e7fdSDimitry Andric # else 404824e7fdSDimitry Andric return static_cast<_Tp>(byteswap(static_cast<uint64_t>(__val))) << 64 | 414824e7fdSDimitry Andric static_cast<_Tp>(byteswap(static_cast<uint64_t>(__val >> 64))); 424824e7fdSDimitry Andric # endif // __has_builtin(__builtin_bswap128) 434824e7fdSDimitry Andric # endif // _LIBCPP_HAS_NO_INT128 444824e7fdSDimitry Andric } else { 454824e7fdSDimitry Andric static_assert(sizeof(_Tp) == 0, "byteswap is unimplemented for integral types of this size"); 464824e7fdSDimitry Andric } 474824e7fdSDimitry Andric } 484824e7fdSDimitry Andric 49*06c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 23 504824e7fdSDimitry Andric 514824e7fdSDimitry Andric _LIBCPP_END_NAMESPACE_STD 524824e7fdSDimitry Andric 534824e7fdSDimitry Andric #endif // _LIBCPP___BIT_BYTESWAP_H 54