2
* CPU detection code, extracted from mmx.h
3
* (c)1997-99 by H. Dietz and R. Fisher
4
* Converted to C and improved by Fabrice Bellard.
6
* This file is part of FFmpeg.
8
* FFmpeg is free software; you can redistribute it and/or
9
* modify it under the terms of the GNU Lesser General Public
10
* License as published by the Free Software Foundation; either
11
* version 2.1 of the License, or (at your option) any later version.
13
* FFmpeg is distributed in the hope that it will be useful,
14
* but WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* Lesser General Public License for more details.
18
* You should have received a copy of the GNU Lesser General Public
19
* License along with FFmpeg; if not, write to the Free Software
20
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24
#include "libavutil/x86_cpu.h"
25
#include "libavcodec/dsputil.h"
29
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
30
#define cpuid(index,eax,ebx,ecx,edx)\
32
("mov %%"REG_b", %%"REG_S"\n\t"\
34
"xchg %%"REG_b", %%"REG_S\
35
: "=a" (eax), "=S" (ebx),\
36
"=c" (ecx), "=d" (edx)\
39
/* Function to test if multimedia instructions are supported... */
43
int eax, ebx, ecx, edx;
44
int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
48
#define PUSHF "pushfq\n\t"
49
#define POPF "popfq\n\t"
51
#define PUSHF "pushfl\n\t"
52
#define POPF "popfl\n\t"
55
/* See if CPUID instruction is supported ... */
56
/* ... Get copies of EFLAGS into eax and ecx */
61
/* ... Toggle the ID bit in one copy and store */
62
/* to the EFLAGS reg */
63
"xor $0x200000, %0\n\t"
67
/* ... Get the (hopefully modified) EFLAGS */
76
return 0; /* CPUID not supported */
78
cpuid(0, max_std_level, ebx, ecx, edx);
80
if(max_std_level >= 1){
81
cpuid(1, eax, ebx, ecx, std_caps);
82
if (std_caps & (1<<23))
84
if (std_caps & (1<<25))
88
if (std_caps & (1<<26))
92
if (ecx & 0x00000200 )
98
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
100
if(max_ext_level >= 0x80000001){
101
cpuid(0x80000001, eax, ebx, ecx, ext_caps);
102
if (ext_caps & (1<<31))
104
if (ext_caps & (1<<30))
105
rval |= FF_MM_3DNOWEXT;
106
if (ext_caps & (1<<23))
108
if (ext_caps & (1<<22))
109
rval |= FF_MM_MMXEXT;
113
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s\n",
114
(rval&FF_MM_MMX) ? "MMX ":"",
115
(rval&FF_MM_MMXEXT) ? "MMX2 ":"",
116
(rval&FF_MM_SSE) ? "SSE ":"",
117
(rval&FF_MM_SSE2) ? "SSE2 ":"",
118
(rval&FF_MM_SSE3) ? "SSE3 ":"",
119
(rval&FF_MM_SSSE3) ? "SSSE3 ":"",
120
(rval&FF_MM_3DNOW) ? "3DNow ":"",
121
(rval&FF_MM_3DNOWEXT) ? "3DNowExt ":"");
130
mm_flags = mm_support();
131
printf("mm_support = 0x%08X\n",mm_flags);