1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/* Common definition for memcpy, mempcpy and memmove implementation.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2017-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3_back) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
attribute_hidden;
static inline void *
IFUNC_SELECTOR (void)
{
const struct cpu_features* cpu_features = __get_cpu_features ();
if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS)
|| CPU_FEATURES_ARCH_P (cpu_features, Prefer_FSRM))
return OPTIMIZE (erms);
if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
{
if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
return OPTIMIZE (avx512_no_vzeroupper);
if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
return OPTIMIZE (avx512_unaligned_erms);
return OPTIMIZE (avx512_unaligned);
}
if (CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
{
if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
return OPTIMIZE (avx_unaligned_erms);
return OPTIMIZE (avx_unaligned);
}
if (!CPU_FEATURES_CPU_P (cpu_features, SSSE3)
|| CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Copy))
{
if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
return OPTIMIZE (sse2_unaligned_erms);
return OPTIMIZE (sse2_unaligned);
}
if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Copy_Backward))
return OPTIMIZE (ssse3_back);
return OPTIMIZE (ssse3);
}
|
