1/* Common definition for strcasecmp family ifunc selections.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2023 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 (evex) attribute_hidden;
23
24extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
25extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
26
27extern __typeof (REDIRECT_NAME) OPTIMIZE (sse42) attribute_hidden;
28
29extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
30
31static inline void *
32IFUNC_SELECTOR (void)
33{
34 const struct cpu_features *cpu_features = __get_cpu_features ();
35
36 if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
37 && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
38 && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
39 AVX_Fast_Unaligned_Load, ))
40 {
41 if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
42 && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
43 return OPTIMIZE (evex);
44
45 if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
46 return OPTIMIZE (avx2_rtm);
47
48 if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
49 Prefer_No_VZEROUPPER, !))
50 return OPTIMIZE (avx2);
51 }
52
53 if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSE4_2)
54 /* Keep this as a runtime check as its not guaranteed at ISA
55 level 2. */
56 && !CPU_FEATURES_ARCH_P (cpu_features, Slow_SSE4_2))
57 return OPTIMIZE (sse42);
58
59 return OPTIMIZE (sse2);
60}
61