ffmpeg/libavutil/x86/emms.h
Michael Niedermayer 61fbb4cd57 Merge commit '4db96649ca700db563d9da4ebe70bf9fc4c7a6ba'
* commit '4db96649ca700db563d9da4ebe70bf9fc4c7a6ba':
  avutil: Ensure that emms_c is always defined, even on non-x86
  configure: Move MinGW CPPFLAGS setting to libc section, where it belongs
  avutil: Move emms code to x86-specific header

Conflicts:
	configure
	libavutil/internal.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-02-15 12:10:08 +01:00

47 lines
1.4 KiB
C

/*
* 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"
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()
*/
static av_always_inline void emms_c(void)
{
if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
__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 */