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11ffcacb L |
1 | /* Multiple versions of strncmp. |
2 | All versions must be listed in ifunc-impl-list.c. | |
2b778ceb | 3 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
11ffcacb L |
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 | |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
11ffcacb L |
19 | |
20 | /* Define multiple versions only for the definition in libc. */ | |
21 | #if IS_IN (libc) | |
22 | # define strncmp __redirect_strncmp | |
23 | # include <string.h> | |
24 | # undef strncmp | |
25 | ||
26 | # define SYMBOL_NAME strncmp | |
27 | # include <init-arch.h> | |
28 | ||
29 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; | |
30 | extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden; | |
31 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse42) attribute_hidden; | |
14570163 | 32 | extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; |
11ffcacb L |
33 | |
34 | static inline void * | |
35 | IFUNC_SELECTOR (void) | |
36 | { | |
37 | const struct cpu_features* cpu_features = __get_cpu_features (); | |
38 | ||
14570163 | 39 | if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER) |
107e6a3c | 40 | && CPU_FEATURE_USABLE_P (cpu_features, AVX2) |
14570163 LS |
41 | && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) |
42 | return OPTIMIZE (avx2); | |
43 | ||
107e6a3c | 44 | if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_2) |
11ffcacb L |
45 | && !CPU_FEATURES_ARCH_P (cpu_features, Slow_SSE4_2)) |
46 | return OPTIMIZE (sse42); | |
47 | ||
107e6a3c | 48 | if (CPU_FEATURE_USABLE_P (cpu_features, SSSE3)) |
11ffcacb L |
49 | return OPTIMIZE (ssse3); |
50 | ||
51 | return OPTIMIZE (sse2); | |
52 | } | |
53 | ||
54 | libc_ifunc_redirected (__redirect_strncmp, strncmp, IFUNC_SELECTOR ()); | |
55 | ||
56 | # ifdef SHARED | |
57 | __hidden_ver1 (strncmp, __GI_strncmp, __redirect_strncmp) | |
1626a1cf | 58 | __attribute__ ((visibility ("hidden"))) __attribute_copy__ (strncmp); |
11ffcacb L |
59 | # endif |
60 | #endif |