mirror of https://git.videolan.org/git/ffmpeg.git
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_EMMS_H
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#define AVUTIL_EMMS_H
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#include "config.h"
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#include "libavutil/attributes.h"
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#if ARCH_X86
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void avpriv_emms_asm(void);
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#if HAVE_MMX_INLINE
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#ifndef __MMX__
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#include "libavutil/cpu.h"
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#endif
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# define emms_c emms_c
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/**
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* Empty mmx state.
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* this must be called between any dsp function and float/double code.
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* for example sin(); dsp->idct_put(); emms_c(); cos()
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* Note, *alloc() and *free() also use float code in some libc implementations
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* thus this also applies to them or any function using them.
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*/
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static av_always_inline void emms_c(void)
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{
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/* Some inlined functions may also use mmx instructions regardless of
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* runtime cpuflags. With that in mind, we unconditionally empty the
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* mmx state if the target cpu chosen at configure time supports it.
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*/
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#if !defined(__MMX__)
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if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
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#endif
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__asm__ volatile ("emms" ::: "memory");
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}
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#elif HAVE_MMX && HAVE_MM_EMPTY
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# include <mmintrin.h>
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# define emms_c _mm_empty
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#elif HAVE_MMX_EXTERNAL
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# define emms_c avpriv_emms_asm
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#endif /* HAVE_MMX_INLINE */
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#endif /* ARCH_X86 */
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#ifndef emms_c
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# define emms_c() do {} while(0)
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#endif
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#endif /* AVUTIL_EMMS_H */
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