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.
55 lines
1.8 KiB
55 lines
1.8 KiB
/* |
|
* 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 |
|
*/ |
|
|
|
#ifndef AVUTIL_X86_EMMS_H |
|
#define AVUTIL_X86_EMMS_H |
|
|
|
#include "config.h" |
|
#include "libavutil/attributes.h" |
|
#include "libavutil/cpu.h" |
|
|
|
void avpriv_emms_yasm(void); |
|
|
|
#if HAVE_MMX_INLINE |
|
# define emms_c emms_c |
|
/** |
|
* Empty mmx state. |
|
* this must be called between any dsp function and float/double code. |
|
* for example sin(); dsp->idct_put(); emms_c(); cos() |
|
* Note, *alloc() and *free() also use float code in some libc implementations |
|
* thus this also applies to them or any function using them. |
|
*/ |
|
static av_always_inline void emms_c(void) |
|
{ |
|
/* Some inlined functions may also use mmx instructions regardless of |
|
* runtime cpuflags. With that in mind, we unconditionally empty the |
|
* mmx state if the target cpu chosen at configure time supports it. |
|
*/ |
|
#if !defined(__MMX__) |
|
if(av_get_cpu_flags() & AV_CPU_FLAG_MMX) |
|
#endif |
|
__asm__ volatile ("emms" ::: "memory"); |
|
} |
|
#elif HAVE_MMX && HAVE_MM_EMPTY |
|
# include <mmintrin.h> |
|
# define emms_c _mm_empty |
|
#elif HAVE_MMX_EXTERNAL |
|
# define emms_c avpriv_emms_yasm |
|
#endif /* HAVE_MMX_INLINE */ |
|
|
|
#endif /* AVUTIL_X86_EMMS_H */
|
|
|