181ad6265SDimitry Andric // -*- C++ -*- 281ad6265SDimitry Andric //===----------------------------------------------------------------------===// 381ad6265SDimitry Andric // 481ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 581ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 681ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 781ad6265SDimitry Andric // 881ad6265SDimitry Andric //===----------------------------------------------------------------------===// 981ad6265SDimitry Andric 1081ad6265SDimitry Andric #ifndef _LIBCPP___MEMORY_ASSUME_ALIGNED_H 1181ad6265SDimitry Andric #define _LIBCPP___MEMORY_ASSUME_ALIGNED_H 1281ad6265SDimitry Andric 1381ad6265SDimitry Andric #include <__assert> 1481ad6265SDimitry Andric #include <__config> 15bdd1243dSDimitry Andric #include <__type_traits/is_constant_evaluated.h> 1681ad6265SDimitry Andric #include <cstddef> 1781ad6265SDimitry Andric #include <cstdint> 1881ad6265SDimitry Andric 1981ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2081ad6265SDimitry Andric # pragma GCC system_header 2181ad6265SDimitry Andric #endif 2281ad6265SDimitry Andric 2381ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 2481ad6265SDimitry Andric 2581ad6265SDimitry Andric template <size_t _Np, class _Tp> __assume_aligned(_Tp * __ptr)265f757f3fSDimitry Andric_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* __assume_aligned(_Tp* __ptr) { 27cb14a3feSDimitry Andric static_assert(_Np != 0 && (_Np & (_Np - 1)) == 0, "std::assume_aligned<N>(p) requires N to be a power of two"); 2881ad6265SDimitry Andric 295f757f3fSDimitry Andric if (__libcpp_is_constant_evaluated()) { 30*7a6dacacSDimitry Andric (void)__builtin_assume_aligned(__ptr, _Np); 3181ad6265SDimitry Andric return __ptr; 3281ad6265SDimitry Andric } else { 33*7a6dacacSDimitry Andric _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN( 34*7a6dacacSDimitry Andric reinterpret_cast<uintptr_t>(__ptr) % _Np == 0, "Alignment assumption is violated"); 3581ad6265SDimitry Andric return static_cast<_Tp*>(__builtin_assume_aligned(__ptr, _Np)); 3681ad6265SDimitry Andric } 3781ad6265SDimitry Andric } 3881ad6265SDimitry Andric 395f757f3fSDimitry Andric #if _LIBCPP_STD_VER >= 20 405f757f3fSDimitry Andric 415f757f3fSDimitry Andric template <size_t _Np, class _Tp> assume_aligned(_Tp * __ptr)425f757f3fSDimitry Andric[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Tp* assume_aligned(_Tp* __ptr) { 435f757f3fSDimitry Andric return std::__assume_aligned<_Np>(__ptr); 445f757f3fSDimitry Andric } 455f757f3fSDimitry Andric 4606c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 4781ad6265SDimitry Andric 4881ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 4981ad6265SDimitry Andric 5081ad6265SDimitry Andric #endif // _LIBCPP___MEMORY_ASSUME_ALIGNED_H 51