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d4cc385c L |
1 | /* Multiple versions of wcsnlen. |
2 | All versions must be listed in ifunc-impl-list.c. | |
2b778ceb | 3 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
d4cc385c 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/>. */ |
d4cc385c | 19 | |
58d021c8 | 20 | /* Define multiple versions only for the definition in libc. */ |
d4cc385c L |
21 | #if IS_IN (libc) |
22 | # define __wcsnlen __redirect_wcsnlen | |
23 | # include <wchar.h> | |
24 | # undef __wcsnlen | |
25 | ||
26 | # define SYMBOL_NAME wcsnlen | |
2e87c7d1 L |
27 | # include <init-arch.h> |
28 | ||
29 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; | |
30 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden; | |
dc485ceb | 31 | extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; |
2e87c7d1 L |
32 | |
33 | static inline void * | |
34 | IFUNC_SELECTOR (void) | |
35 | { | |
36 | const struct cpu_features* cpu_features = __get_cpu_features (); | |
37 | ||
dc485ceb | 38 | if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER) |
107e6a3c | 39 | && CPU_FEATURE_USABLE_P (cpu_features, AVX2) |
dc485ceb L |
40 | && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) |
41 | return OPTIMIZE (avx2); | |
42 | ||
107e6a3c | 43 | if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1)) |
2e87c7d1 L |
44 | return OPTIMIZE (sse4_1); |
45 | ||
46 | return OPTIMIZE (sse2); | |
47 | } | |
d4cc385c L |
48 | |
49 | libc_ifunc_redirected (__redirect_wcsnlen, __wcsnlen, IFUNC_SELECTOR ()); | |
50 | weak_alias (__wcsnlen, wcsnlen); | |
51 | #endif |