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 "../dsputil.h"
36 /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
37 #define cpuid(index,eax,ebx,ecx,edx)\
39 ("mov %%"REG_b", %%"REG_S"\n\t"\
41 "xchg %%"REG_b", %%"REG_S\
42 : "=a" (eax), "=S" (ebx),\
43 "=c" (ecx), "=d" (edx)\
46 /* Function to test if multimedia instructions are supported... */
50 int eax, ebx, ecx, edx;
51 int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
54 __asm__ __volatile__ (
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))
85 rval |= MM_MMXEXT | MM_SSE;
86 if (std_caps & (1<<26))
92 cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
94 if(max_ext_level >= 0x80000001){
95 cpuid(0x80000001, eax, ebx, ecx, ext_caps);
96 if (ext_caps & (1<<31))
98 if (ext_caps & (1<<30))
100 if (ext_caps & (1<<23))
102 if (ext_caps & (1<<22))
107 av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n",
108 (rval&MM_MMX) ? "MMX ":"",
109 (rval&MM_MMXEXT) ? "MMX2 ":"",
110 (rval&MM_SSE) ? "SSE ":"",
111 (rval&MM_SSE2) ? "SSE2 ":"",
112 (rval&MM_3DNOW) ? "3DNow ":"",
113 (rval&MM_3DNOWEXT) ? "3DNowExt ":"");
122 mm_flags = mm_support();
123 printf("mm_support = 0x%08X\n",mm_flags);