1 /* Common definition for ifunc selections optimized with SSE2, unaligned
2 SSE2 and SSSE3.
3 All versions must be listed in ifunc-impl-list.c.
4 Copyright (C) 2017-2021 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <https://www.gnu.org/licenses/>. */
20
21 #include <init-arch.h>
22
23 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
24 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
25 attribute_hidden;
26 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
27 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
28 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
29 extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
30
31 static inline void *
IFUNC_SELECTOR(void)32 IFUNC_SELECTOR (void)
33 {
34 const struct cpu_features* cpu_features = __get_cpu_features ();
35
36 if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
37 && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
38 {
39 if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
40 && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
41 return OPTIMIZE (evex);
42
43 if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
44 return OPTIMIZE (avx2_rtm);
45
46 if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
47 return OPTIMIZE (avx2);
48 }
49
50 if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load))
51 return OPTIMIZE (sse2_unaligned);
52
53 if (CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
54 return OPTIMIZE (ssse3);
55
56 return OPTIMIZE (sse2);
57 }
58