/* * 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 "config.h" #include "libavutil/attributes.h" #if ARCH_X86 void avpriv_emms_asm(void); #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"); } #elif HAVE_MMX && HAVE_MM_EMPTY # include <mmintrin.h> # define emms_c _mm_empty #elif HAVE_MMX_EXTERNAL # define emms_c avpriv_emms_asm #endif /* HAVE_MMX_INLINE */ #endif /* ARCH_X86 */ #ifndef emms_c # define emms_c() do {} while(0) #endif #endif /* AVUTIL_EMMS_H */