| 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 */ |