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
23extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
24extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
25 attribute_hidden;
26extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
27extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
28
29static inline void *
30IFUNC_SELECTOR (void)
31{
32 const struct cpu_features* cpu_features = __get_cpu_features ();
33
34 if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
35 && CPU_FEATURE_USABLE_P (cpu_features, AVX2)
36 && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
37 return OPTIMIZE (avx2);
38
39 if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load))
40 return OPTIMIZE (sse2_unaligned);
41
42 if (CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
43 return OPTIMIZE (ssse3);
44
45 return OPTIMIZE (sse2);
46}
47