1/* Multiple versions of memset
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2014-2016 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 <http://www.gnu.org/licenses/>. */
19
20#include <sysdep.h>
21#include <shlib-compat.h>
22#include <init-arch.h>
23
24/* Define multiple versions only for the definition in lib. */
25#if IS_IN (libc)
26ENTRY(memset)
27 .type memset, @gnu_indirect_function
28 LOAD_RTLD_GLOBAL_RO_RDX
29 leaq __memset_sse2(%rip), %rax
30 HAS_ARCH_FEATURE (AVX2_Usable)
31 jz 2f
32 leaq __memset_avx2(%rip), %rax
33#ifdef HAVE_AVX512_ASM_SUPPORT
34 HAS_ARCH_FEATURE (AVX512F_Usable)
35 jz 2f
36 HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
37 jz 2f
38 leaq __memset_avx512_no_vzeroupper(%rip), %rax
39#endif
402: ret
41END(memset)
42#endif
43
44#if IS_IN (libc)
45# undef memset
46# define memset __memset_sse2
47
48# undef __memset_chk
49# define __memset_chk __memset_chk_sse2
50
51# ifdef SHARED
52# undef libc_hidden_builtin_def
53/* It doesn't make sense to send libc-internal memset calls through a PLT.
54 The speedup we get from using GPR instruction is likely eaten away
55 by the indirect call in the PLT. */
56# define libc_hidden_builtin_def(name) \
57 .globl __GI_memset; __GI_memset = __memset_sse2
58# endif
59
60# undef strong_alias
61# define strong_alias(original, alias)
62#endif
63
64#include "../memset.S"
65