1 /* Common definition for wmemset/wmemset_chk ifunc selections.
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <init-arch.h>
20
21 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden;
22 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
23 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
24 attribute_hidden;
25 extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned) attribute_hidden;
26 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned) attribute_hidden;
27
28 static inline void *
IFUNC_SELECTOR(void)29 IFUNC_SELECTOR (void)
30 {
31 const struct cpu_features* cpu_features = __get_cpu_features ();
32
33 if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
34 && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
35 {
36 if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
37 {
38 if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
39 return OPTIMIZE (avx512_unaligned);
40
41 return OPTIMIZE (evex_unaligned);
42 }
43
44 if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
45 return OPTIMIZE (avx2_unaligned_rtm);
46
47 if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
48 return OPTIMIZE (avx2_unaligned);
49 }
50
51 return OPTIMIZE (sse2_unaligned);
52 }
53