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76cdc1d73e
The code that commitbb24fa31famoved to a separate file assume_aligned.h was introduced in commit25e2a556deand developed by employees of MariaDB Corporation.
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/*
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Copyright (c) 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#pragma once
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#include <cassert>
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#include <cstring>
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#ifdef _MSC_VER
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template <std::size_t Alignment, class T>
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static inline T my_assume_aligned(T ptr)
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{
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assert(reinterpret_cast<size_t>(ptr) % Alignment == 0);
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__assume(reinterpret_cast<size_t>(ptr) % Alignment == 0);
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return ptr;
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}
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#else
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template <std::size_t Alignment, class T>
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static inline T my_assume_aligned(T ptr)
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{
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assert(reinterpret_cast<size_t>(ptr) % Alignment == 0);
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return static_cast<T>(__builtin_assume_aligned(ptr, Alignment));
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}
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#endif
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template <std::size_t Alignment>
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inline void *memcpy_aligned(void *dest, const void *src, size_t n)
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{
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static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2");
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return std::memcpy(my_assume_aligned<Alignment>(dest),
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my_assume_aligned<Alignment>(src), n);
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}
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template <std::size_t Alignment>
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inline void *memmove_aligned(void *dest, const void *src, size_t n)
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{
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static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2");
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return std::memmove(my_assume_aligned<Alignment>(dest),
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my_assume_aligned<Alignment>(src), n);
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}
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template <std::size_t Alignment>
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inline int memcmp_aligned(const void *s1, const void *s2, size_t n)
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{
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static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2");
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return std::memcmp(my_assume_aligned<Alignment>(s1),
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my_assume_aligned<Alignment>(s2), n);
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}
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template <std::size_t Alignment>
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inline void *memset_aligned(void *s, int c, size_t n)
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{
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static_assert(Alignment && !(Alignment & (Alignment - 1)), "power of 2");
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return std::memset(my_assume_aligned<Alignment>(s), c, n);
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}
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