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
|
/* This file is part of the GNU C Library.
Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sys/param.h>
enum
{
COMMON_CPUID_INDEX_1 = 0,
/* Keep the following line at the end. */
COMMON_CPUID_INDEX_MAX
};
extern struct cpu_features
{
enum
{
arch_kind_unknown = 0,
arch_kind_intel,
arch_kind_amd,
arch_kind_other
} kind;
int max_cpuid;
struct cpuid_registers
{
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
} cpuid[COMMON_CPUID_INDEX_MAX];
unsigned int family;
unsigned int model;
} __cpu_features attribute_hidden;
extern void __init_cpu_features (void) attribute_hidden;
#define INIT_ARCH()\
do \
if (__cpu_features.kind == arch_kind_unknown) \
__init_cpu_features (); \
while (0)
/* Used from outside libc.so to get access to the CPU features structure. */
extern const struct cpu_features *__get_cpu_features (void)
__attribute__ ((const));
/* Following are the feature tests used throughout libc. */
#ifndef NOT_IN_libc
# define HAS_SSE2 \
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx & (1 << 26)) != 0)
# define HAS_POPCOUNT \
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
# define HAS_SSE4_2 \
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)
# define HAS_FMA \
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 12)) != 0)
#else
# define HAS_SSE2 \
((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].edx & (1 << 26)) != 0)
# define HAS_POPCOUNT \
((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
# define HAS_SSE4_2 \
((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)
# define HAS_FMA \
((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 12)) != 0)
#endif
|
