/src/ffmpeg/libavutil/emms.h

Source
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_EMMS_H
#define AVUTIL_EMMS_H

#include <stdint.h>
#include <stdlib.h>

#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/log.h"

#if ARCH_X86

#if HAVE_MMX_INLINE
#ifndef __MMX__
#include "libavutil/cpu.h"
#endif

#   define emms_c emms_c
/**
 * Empty mmx state.
 * this must be called between any dsp function and float/double code.
 * for example sin(); dsp->idct_put(); emms_c(); cos()
 * Note, *alloc() and *free() also use float code in some libc implementations
 * thus this also applies to them or any function using them.
 */
static av_always_inline void emms_c(void)
{
/* Some inlined functions may also use mmx instructions regardless of
 * runtime cpuflags. With that in mind, we unconditionally empty the
 * mmx state if the target cpu chosen at configure time supports it.
 */
#if !defined(__MMX__)
    if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
#endif
        __asm__ volatile ("emms" ::: "memory");
}

static inline void ff_assert0_fpu(const char *file, int line_number)
{
    uint16_t state[14];
     __asm__ volatile (
        "fstenv %0 \n\t"
        : "+m" (state)
        :
        : "memory"
    );
    if ((state[4] & 3) != 3) {
        emms_c();
        av_log(NULL, AV_LOG_PANIC,
               "Invalid floating point state assertion "
               "triggered at line %u in file %s\n",
               line_number, file);
        abort();
    }
}

#define ff_assert0_fpu() ff_assert0_fpu(__FILE__, __LINE__)

#elif HAVE_MMX && HAVE_MM_EMPTY
#   include <mmintrin.h>
#   define emms_c _mm_empty
#elif HAVE_MMX_EXTERNAL
void ff_emms_asm(void);
#   define emms_c ff_emms_asm
#endif /* HAVE_MMX_INLINE */

#endif /* ARCH_X86 */

#ifndef emms_c
#   define emms_c() do {} while(0)
#endif

#ifndef ff_assert0_fpu
#define ff_assert0_fpu() ((void)0)
#endif

#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 1
#define ff_assert1_fpu() ff_assert0_fpu()
#else
#define ff_assert1_fpu() ((void)0)
#endif

#endif /* AVUTIL_EMMS_H */

Coverage Report

Created: 2026-07-30 07:17

Line	Count	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	0	# 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		static av_always_inline void emms_c(void)
45	0	{
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	0	__asm__ volatile ("emms" ::: "memory");
54	0	} Unexecuted instantiation: avcodec.c:emms_c Unexecuted instantiation: decode.c:emms_c Unexecuted instantiation: encode.c:emms_c
55
56		static inline void ff_assert0_fpu(const char *file, int line_number)
57	0	{
58	0	uint16_t state[14];
59	0	__asm__ volatile (
60	0	"fstenv %0 \n\t"
61	0	: "+m" (state)
62	0	:
63	0	: "memory"
64	0	);
65	0	if ((state[4] & 3) != 3) {
66	0	emms_c();
67	0	av_log(NULL, AV_LOG_PANIC,
68	0	"Invalid floating point state assertion "
69	0	"triggered at line %u in file %s\n",
70	0	line_number, file);
71	0	abort();
72	0	}
73	0	} Unexecuted instantiation: avcodec.c:ff_assert0_fpu Unexecuted instantiation: decode.c:ff_assert0_fpu Unexecuted instantiation: encode.c:ff_assert0_fpu
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	0	#define ff_assert1_fpu() ((void)0)
99		#endif
100
101		#endif /* AVUTIL_EMMS_H */