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8fe57365 L |
1 | /* Multiple versions of strchr. |
2 | All versions must be listed in ifunc-impl-list.c. | |
04277e02 | 3 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
8fe57365 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/>. */ |
8fe57365 L |
19 | |
20 | /* Define multiple versions only for the definition in libc. */ | |
21 | #if IS_IN (libc) | |
22 | # define strchr __redirect_strchr | |
23 | # include <string.h> | |
24 | # undef strchr | |
25 | ||
26 | # define SYMBOL_NAME strchr | |
27 | # include <init-arch.h> | |
28 | ||
29 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; | |
30 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_no_bsf) attribute_hidden; | |
31 | extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; | |
32 | ||
33 | static inline void * | |
34 | IFUNC_SELECTOR (void) | |
35 | { | |
36 | const struct cpu_features* cpu_features = __get_cpu_features (); | |
37 | ||
38 | if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER) | |
39 | && CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable) | |
40 | && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) | |
41 | return OPTIMIZE (avx2); | |
42 | ||
43 | if (CPU_FEATURES_ARCH_P (cpu_features, Slow_BSF)) | |
44 | return OPTIMIZE (sse2_no_bsf); | |
45 | ||
46 | return OPTIMIZE (sse2); | |
47 | } | |
48 | ||
49 | libc_ifunc_redirected (__redirect_strchr, strchr, IFUNC_SELECTOR ()); | |
50 | weak_alias (strchr, index) | |
51 | # ifdef SHARED | |
52 | __hidden_ver1 (strchr, __GI_strchr, __redirect_strchr) | |
1626a1cf | 53 | __attribute__((visibility ("hidden"))) __attribute_copy__ (strchr); |
8fe57365 L |
54 | # endif |
55 | #endif |