mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.7 KiB
126 lines
3.7 KiB
/* |
|
* CPU detection code, extracted from mmx.h |
|
* (c)1997-99 by H. Dietz and R. Fisher |
|
* Converted to C and improved by Fabrice Bellard. |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg 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. |
|
* |
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include <stdlib.h> |
|
#include "../dsputil.h" |
|
|
|
#undef printf |
|
|
|
#ifdef ARCH_X86_64 |
|
# define REG_b "rbx" |
|
# define REG_S "rsi" |
|
#else |
|
# define REG_b "ebx" |
|
# define REG_S "esi" |
|
#endif |
|
|
|
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */ |
|
#define cpuid(index,eax,ebx,ecx,edx)\ |
|
__asm __volatile\ |
|
("mov %%"REG_b", %%"REG_S"\n\t"\ |
|
"cpuid\n\t"\ |
|
"xchg %%"REG_b", %%"REG_S\ |
|
: "=a" (eax), "=S" (ebx),\ |
|
"=c" (ecx), "=d" (edx)\ |
|
: "0" (index)); |
|
|
|
/* Function to test if multimedia instructions are supported... */ |
|
int mm_support(void) |
|
{ |
|
int rval = 0; |
|
int eax, ebx, ecx, edx; |
|
int max_std_level, max_ext_level, std_caps=0, ext_caps=0; |
|
long a, c; |
|
|
|
__asm__ __volatile__ ( |
|
/* See if CPUID instruction is supported ... */ |
|
/* ... Get copies of EFLAGS into eax and ecx */ |
|
"pushf\n\t" |
|
"pop %0\n\t" |
|
"mov %0, %1\n\t" |
|
|
|
/* ... Toggle the ID bit in one copy and store */ |
|
/* to the EFLAGS reg */ |
|
"xor $0x200000, %0\n\t" |
|
"push %0\n\t" |
|
"popf\n\t" |
|
|
|
/* ... Get the (hopefully modified) EFLAGS */ |
|
"pushf\n\t" |
|
"pop %0\n\t" |
|
: "=a" (a), "=c" (c) |
|
: |
|
: "cc" |
|
); |
|
|
|
if (a == c) |
|
return 0; /* CPUID not supported */ |
|
|
|
cpuid(0, max_std_level, ebx, ecx, edx); |
|
|
|
if(max_std_level >= 1){ |
|
cpuid(1, eax, ebx, ecx, std_caps); |
|
if (std_caps & (1<<23)) |
|
rval |= MM_MMX; |
|
if (std_caps & (1<<25)) |
|
rval |= MM_MMXEXT | MM_SSE; |
|
if (std_caps & (1<<26)) |
|
rval |= MM_SSE2; |
|
if (ecx & 1) |
|
rval |= MM_SSE3; |
|
} |
|
|
|
cpuid(0x80000000, max_ext_level, ebx, ecx, edx); |
|
|
|
if(max_ext_level >= 0x80000001){ |
|
cpuid(0x80000001, eax, ebx, ecx, ext_caps); |
|
if (ext_caps & (1<<31)) |
|
rval |= MM_3DNOW; |
|
if (ext_caps & (1<<30)) |
|
rval |= MM_3DNOWEXT; |
|
if (ext_caps & (1<<23)) |
|
rval |= MM_MMX; |
|
if (ext_caps & (1<<22)) |
|
rval |= MM_MMXEXT; |
|
} |
|
|
|
#if 0 |
|
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n", |
|
(rval&MM_MMX) ? "MMX ":"", |
|
(rval&MM_MMXEXT) ? "MMX2 ":"", |
|
(rval&MM_SSE) ? "SSE ":"", |
|
(rval&MM_SSE2) ? "SSE2 ":"", |
|
(rval&MM_3DNOW) ? "3DNow ":"", |
|
(rval&MM_3DNOWEXT) ? "3DNowExt ":""); |
|
#endif |
|
return rval; |
|
} |
|
|
|
#ifdef __TEST__ |
|
int main ( void ) |
|
{ |
|
int mm_flags; |
|
mm_flags = mm_support(); |
|
printf("mm_support = 0x%08X\n",mm_flags); |
|
return 0; |
|
} |
|
#endif
|
|
|