blob: 7a6ff9a92a5738f9804ce445e0a45f6cd80f6f60 (
plain)
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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* IFUNC resolver with CPU_FEATURE_ACTIVE.
Copyright (C) 2021-2022 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 <sys/platform/x86.h>
enum isa
{
none,
sse2,
sse4_2,
avx,
avx2,
avx512f
};
enum isa
__attribute__ ((__optimize__ ("-fno-stack-protector")))
get_isa (void)
{
if (CPU_FEATURE_ACTIVE (AVX512F))
return avx512f;
if (CPU_FEATURE_ACTIVE (AVX2))
return avx2;
if (CPU_FEATURE_ACTIVE (AVX))
return avx;
if (CPU_FEATURE_ACTIVE (SSE4_2))
return sse4_2;
if (CPU_FEATURE_ACTIVE (SSE2))
return sse2;
return none;
}
static int
isa_sse2 (void)
{
return sse2;
}
static int
isa_sse4_2 (void)
{
return sse4_2;
}
static int
isa_avx (void)
{
return avx;
}
static int
isa_avx2 (void)
{
return avx2;
}
static int
isa_avx512f (void)
{
return avx512f;
}
static int
isa_none (void)
{
return none;
}
int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
void *
__attribute__ ((__optimize__ ("-fno-stack-protector")))
foo_ifunc (void)
{
switch (get_isa ())
{
case avx512f:
return isa_avx512f;
case avx2:
return isa_avx2;
case avx:
return isa_avx;
case sse4_2:
return isa_sse4_2;
case sse2:
return isa_sse2;
default:
break;
}
return isa_none;
}
|
