Viewing file:  assume_aligned.h (2.29 KB) -rw-r--r--
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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);
}
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