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);