1/* Common definition for memcpy, mempcpy and memmove implementation.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2020 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 (ssse3) attribute_hidden;
28extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3_back) attribute_hidden;
29extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned) attribute_hidden;
30extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned_erms)
31 attribute_hidden;
32extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
33 attribute_hidden;
34extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
35 attribute_hidden;
36extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
37 attribute_hidden;
38
39static inline void *
40IFUNC_SELECTOR (void)
41{
42 const struct cpu_features* cpu_features = __get_cpu_features ();
43
44 if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS)
45 || CPU_FEATURES_ARCH_P (cpu_features, Prefer_FSRM))
46 return OPTIMIZE (erms);
47
48 if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
49 && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
50 {
51 if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
52 return OPTIMIZE (avx512_no_vzeroupper);
53
54 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
55 return OPTIMIZE (avx512_unaligned_erms);
56
57 return OPTIMIZE (avx512_unaligned);
58 }
59
60 if (CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
61 {
62 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
63 return OPTIMIZE (avx_unaligned_erms);
64
65 return OPTIMIZE (avx_unaligned);
66 }
67
68 if (!CPU_FEATURE_USABLE_P (cpu_features, SSSE3)
69 || CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Copy))
70 {
71 if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
72 return OPTIMIZE (sse2_unaligned_erms);
73
74 return OPTIMIZE (sse2_unaligned);
75 }
76
77 if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Copy_Backward))
78 return OPTIMIZE (ssse3_back);
79
80 return OPTIMIZE (ssse3);
81}
82