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assume_aligned.h
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/* Copyright (c) 2020, MariaDB Corporation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ #pragma once #include <cassert> #include <cstring> #ifdef _MSC_VER template <std::size_t Alignment, class T> static inline T my_assume_aligned(T ptr) { assert(reinterpret_cast<size_t>(ptr) % Alignment == 0); __assume(reinterpret_cast<size_t>(ptr) % Alignment == 0); return ptr; } #else template <std::size_t Alignment, class T> static inline T my_assume_aligned(T ptr) { assert(reinterpret_cast<size_t>(ptr) % Alignment == 0); return static_cast<T>(__builtin_assume_aligned(ptr, Alignment)); } #endif template <std::size_t Alignment> inline void *memcpy_aligned(void *dest, const void *src, size_t n) { static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2"); return std::memcpy(my_assume_aligned<Alignment>(dest), my_assume_aligned<Alignment>(src), n); } template <std::size_t Alignment> inline void *memmove_aligned(void *dest, const void *src, size_t n) { static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2"); return std::memmove(my_assume_aligned<Alignment>(dest), my_assume_aligned<Alignment>(src), n); } template <std::size_t Alignment> inline int memcmp_aligned(const void *s1, const void *s2, size_t n) { static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2"); return std::memcmp(my_assume_aligned<Alignment>(s1), my_assume_aligned<Alignment>(s2), n); } template <std::size_t Alignment> inline void *memset_aligned(void *s, int c, size_t n) { static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2"); return std::memset(my_assume_aligned<Alignment>(s), c, n); }