1/* Common definition for ifunc selections optimized wide-character
2 string copy functions.
3
4 All versions must be listed in ifunc-impl-list.c.
5 Copyright (C) 2022-2023 Free Software Foundation, Inc.
6 This file is part of the GNU C Library.
7
8 The GNU C Library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 2.1 of the License, or (at your option) any later version.
12
13 The GNU C Library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public
19 License along with the GNU C Library; if not, see
20 <https://www.gnu.org/licenses/>. */
21
22#include <init-arch.h>
23
24#ifndef GENERIC
25# define GENERIC generic
26#endif
27
28extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
29
30extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
31
32extern __typeof (REDIRECT_NAME) OPTIMIZE (GENERIC) attribute_hidden;
33
34static inline void *
35IFUNC_SELECTOR (void)
36{
37 const struct cpu_features *cpu_features = __get_cpu_features ();
38
39 if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
40 && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
41 && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
42 AVX_Fast_Unaligned_Load, ))
43 {
44 if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
45 && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
46 return OPTIMIZE (evex);
47
48 if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
49 Prefer_No_VZEROUPPER, !))
50 return OPTIMIZE (avx2);
51
52 }
53
54 return OPTIMIZE (GENERIC);
55}
56