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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #ifndef AVUTIL_X86_EMMS_H
  20. #define AVUTIL_X86_EMMS_H
  21.  
  22. #include "config.h"
  23. #include "libavutil/attributes.h"
  24. #include "libavutil/cpu.h"
  25.  
  26. void avpriv_emms_yasm(void);
  27.  
  28. #if HAVE_MMX_INLINE
  29. #   define emms_c emms_c
  30. /**
  31.  * Empty mmx state.
  32.  * this must be called between any dsp function and float/double code.
  33.  * for example sin(); dsp->idct_put(); emms_c(); cos()
  34.  */
  35. static av_always_inline void emms_c(void)
  36. {
  37.     if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
  38.         __asm__ volatile ("emms" ::: "memory");
  39. }
  40. #elif HAVE_MMX && HAVE_MM_EMPTY
  41. #   include <mmintrin.h>
  42. #   define emms_c _mm_empty
  43. #elif HAVE_MMX_EXTERNAL
  44. #   define emms_c avpriv_emms_yasm
  45. #endif /* HAVE_MMX_INLINE */
  46.  
  47. #endif /* AVUTIL_X86_EMMS_H */
  48.