1/* Multiple versions of strcmp.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2020 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 strcmp __redirect_strcmp
23# include <string.h>
24# undef strcmp
25
26# define SYMBOL_NAME strcmp
27# include <init-arch.h>
28
29extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
30extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden;
31extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
32extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
33
34static inline void *
35IFUNC_SELECTOR (void)
36{
37 const struct cpu_features* cpu_features = __get_cpu_features ();
38
39 if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
40 && CPU_FEATURE_USABLE_P (cpu_features, AVX2)
41 && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
42 return OPTIMIZE (avx2);
43
44 if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load))
45 return OPTIMIZE (sse2_unaligned);
46
47 if (CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
48 return OPTIMIZE (ssse3);
49
50 return OPTIMIZE (sse2);
51}
52
53libc_ifunc_redirected (__redirect_strcmp, strcmp, IFUNC_SELECTOR ());
54
55# ifdef SHARED
56__hidden_ver1 (strcmp, __GI_strcmp, __redirect_strcmp)
57 __attribute__ ((visibility ("hidden"))) __attribute_copy__ (strcmp);
58# endif
59#endif
60