| Line | Branch | Exec | Source |
|---|---|---|---|
| 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_EMMS_H | ||
| 20 | #define AVUTIL_EMMS_H | ||
| 21 | |||
| 22 | #include "config.h" | ||
| 23 | #include "libavutil/attributes.h" | ||
| 24 | |||
| 25 | #if ARCH_X86 | ||
| 26 | |||
| 27 | void avpriv_emms_asm(void); | ||
| 28 | |||
| 29 | #if HAVE_MMX_INLINE | ||
| 30 | #ifndef __MMX__ | ||
| 31 | #include "libavutil/cpu.h" | ||
| 32 | #endif | ||
| 33 | |||
| 34 | # define emms_c emms_c | ||
| 35 | /** | ||
| 36 | * Empty mmx state. | ||
| 37 | * this must be called between any dsp function and float/double code. | ||
| 38 | * for example sin(); dsp->idct_put(); emms_c(); cos() | ||
| 39 | * Note, *alloc() and *free() also use float code in some libc implementations | ||
| 40 | * thus this also applies to them or any function using them. | ||
| 41 | */ | ||
| 42 | 2408298 | static av_always_inline void emms_c(void) | |
| 43 | { | ||
| 44 | /* Some inlined functions may also use mmx instructions regardless of | ||
| 45 | * runtime cpuflags. With that in mind, we unconditionally empty the | ||
| 46 | * mmx state if the target cpu chosen at configure time supports it. | ||
| 47 | */ | ||
| 48 | #if !defined(__MMX__) | ||
| 49 | if(av_get_cpu_flags() & AV_CPU_FLAG_MMX) | ||
| 50 | #endif | ||
| 51 | 2408298 | __asm__ volatile ("emms" ::: "memory"); | |
| 52 | 2408298 | } | |
| 53 | #elif HAVE_MMX && HAVE_MM_EMPTY | ||
| 54 | # include <mmintrin.h> | ||
| 55 | # define emms_c _mm_empty | ||
| 56 | #elif HAVE_MMX_EXTERNAL | ||
| 57 | # define emms_c avpriv_emms_asm | ||
| 58 | #endif /* HAVE_MMX_INLINE */ | ||
| 59 | |||
| 60 | #endif /* ARCH_X86 */ | ||
| 61 | |||
| 62 | #ifndef emms_c | ||
| 63 | # define emms_c() do {} while(0) | ||
| 64 | #endif | ||
| 65 | |||
| 66 | #endif /* AVUTIL_EMMS_H */ | ||
| 67 |