| 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 <stdint.h> | ||
| 23 | #include <stdlib.h> | ||
| 24 | |||
| 25 | #include "config.h" | ||
| 26 | #include "libavutil/attributes.h" | ||
| 27 | #include "libavutil/log.h" | ||
| 28 | |||
| 29 | #if ARCH_X86 | ||
| 30 | |||
| 31 | #if HAVE_MMX_INLINE | ||
| 32 | #ifndef __MMX__ | ||
| 33 | #include "libavutil/cpu.h" | ||
| 34 | #endif | ||
| 35 | |||
| 36 | # define emms_c emms_c | ||
| 37 | /** | ||
| 38 | * Empty mmx state. | ||
| 39 | * this must be called between any dsp function and float/double code. | ||
| 40 | * for example sin(); dsp->idct_put(); emms_c(); cos() | ||
| 41 | * Note, *alloc() and *free() also use float code in some libc implementations | ||
| 42 | * thus this also applies to them or any function using them. | ||
| 43 | */ | ||
| 44 | 1549104 | static av_always_inline void emms_c(void) | |
| 45 | { | ||
| 46 | /* Some inlined functions may also use mmx instructions regardless of | ||
| 47 | * runtime cpuflags. With that in mind, we unconditionally empty the | ||
| 48 | * mmx state if the target cpu chosen at configure time supports it. | ||
| 49 | */ | ||
| 50 | #if !defined(__MMX__) | ||
| 51 | if(av_get_cpu_flags() & AV_CPU_FLAG_MMX) | ||
| 52 | #endif | ||
| 53 | 1549104 | __asm__ volatile ("emms" ::: "memory"); | |
| 54 | 1549104 | } | |
| 55 | |||
| 56 | static inline void ff_assert0_fpu(const char *file, int line_number) | ||
| 57 | { | ||
| 58 | uint16_t state[14]; | ||
| 59 | __asm__ volatile ( | ||
| 60 | "fstenv %0 \n\t" | ||
| 61 | : "+m" (state) | ||
| 62 | : | ||
| 63 | : "memory" | ||
| 64 | ); | ||
| 65 | if ((state[4] & 3) != 3) { | ||
| 66 | emms_c(); | ||
| 67 | av_log(NULL, AV_LOG_PANIC, | ||
| 68 | "Invalid floating point state assertion " | ||
| 69 | "triggered at line %u in file %s\n", | ||
| 70 | line_number, file); | ||
| 71 | abort(); | ||
| 72 | } | ||
| 73 | } | ||
| 74 | |||
| 75 | #define ff_assert0_fpu() ff_assert0_fpu(__FILE__, __LINE__) | ||
| 76 | |||
| 77 | #elif HAVE_MMX && HAVE_MM_EMPTY | ||
| 78 | # include <mmintrin.h> | ||
| 79 | # define emms_c _mm_empty | ||
| 80 | #elif HAVE_MMX_EXTERNAL | ||
| 81 | void ff_emms_asm(void); | ||
| 82 | # define emms_c ff_emms_asm | ||
| 83 | #endif /* HAVE_MMX_INLINE */ | ||
| 84 | |||
| 85 | #endif /* ARCH_X86 */ | ||
| 86 | |||
| 87 | #ifndef emms_c | ||
| 88 | # define emms_c() do {} while(0) | ||
| 89 | #endif | ||
| 90 | |||
| 91 | #ifndef ff_assert0_fpu | ||
| 92 | #define ff_assert0_fpu() ((void)0) | ||
| 93 | #endif | ||
| 94 | |||
| 95 | #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 1 | ||
| 96 | #define ff_assert1_fpu() ff_assert0_fpu() | ||
| 97 | #else | ||
| 98 | #define ff_assert1_fpu() ((void)0) | ||
| 99 | #endif | ||
| 100 | |||
| 101 | #endif /* AVUTIL_EMMS_H */ | ||
| 102 |