FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavutil/emms.h
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 3 3 100.0%
Functions: 1 1 100.0%
Branches: 0 0 -%

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 2839476 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 2839476 __asm__ volatile ("emms" ::: "memory");
52 2839476 }
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