1/* Common definition for memset/memset_chk ifunc selections.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2021 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#include <init-arch.h>
21
22extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;
23extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
24 attribute_hidden;
25extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
26 attribute_hidden;
27extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
28extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms)
29 attribute_hidden;
30extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
31 attribute_hidden;
32extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
33 attribute_hidden;
34extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
35 attribute_hidden;
36
37static inline void *
38IFUNC_SELECTOR (void)
39{
40 const struct cpu_features* cpu_features = __get_cpu_features ();
41
42 if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS))
43 return OPTIMIZE (erms);
44
45 if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
46 && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
47 {
48 if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
49 return OPTIMIZE (avx512_no_vzeroupper);
50
51 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
52 return OPTIMIZE (avx512_unaligned_erms);
53
54 return OPTIMIZE (avx512_unaligned);
55 }
56
57 if (CPU_FEATURE_USABLE_P (cpu_features, AVX2))
58 {
59 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
60 return OPTIMIZE (avx2_unaligned_erms);
61 else
62 return OPTIMIZE (avx2_unaligned);
63 }
64
65 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
66 return OPTIMIZE (sse2_unaligned_erms);
67
68 return OPTIMIZE (sse2_unaligned);
69}
70