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 25void avpriv_emms_asm(void); 26 27#if HAVE_MMX_INLINE 28#ifndef __MMX__ 29#include "libavutil/cpu.h" 30#endif 31 32# define emms_c emms_c 33/** 34 * Empty mmx state. 35 * this must be called between any dsp function and float/double code. 36 * for example sin(); dsp->idct_put(); emms_c(); cos() 37 * Note, *alloc() and *free() also use float code in some libc implementations 38 * thus this also applies to them or any function using them. 39 */ 40static av_always_inline void emms_c(void) 41{ 42/* Some inlined functions may also use mmx instructions regardless of 43 * runtime cpuflags. With that in mind, we unconditionally empty the 44 * mmx state if the target cpu chosen at configure time supports it. 45 */ 46#if !defined(__MMX__) 47 if(av_get_cpu_flags() & AV_CPU_FLAG_MMX) 48#endif 49 __asm__ volatile ("emms" ::: "memory"); 50} 51#elif HAVE_MMX && HAVE_MM_EMPTY 52# include <mmintrin.h> 53# define emms_c _mm_empty 54#elif HAVE_MMX_EXTERNAL 55# define emms_c avpriv_emms_asm 56#endif /* HAVE_MMX_INLINE */ 57 58#endif /* AVUTIL_X86_EMMS_H */ 59