1/* Multiple versions of memcpy.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20/* Define multiple versions only for the definition in libc. */
21#if IS_IN (libc)
22# define memcpy __redirect_memcpy
23# include <string.h>
24# undef memcpy
25
26# define SYMBOL_NAME memcpy
27# include "ifunc-memmove.h"
28
29libc_ifunc_redirected (__redirect_memcpy, __new_memcpy,
30 IFUNC_SELECTOR ());
31
32# ifdef SHARED
33__hidden_ver1 (__new_memcpy, __GI_memcpy, __redirect_memcpy)
34 __attribute__ ((visibility ("hidden")));
35# endif
36
37# include <shlib-compat.h>
38versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
39#endif
40

source code of glibc/sysdeps/x86_64/multiarch/memcpy.c