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55 lines
1.8 KiB
55 lines
1.8 KiB
/* |
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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_X86_EMMS_H |
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#define AVUTIL_X86_EMMS_H |
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#include "config.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/cpu.h" |
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void avpriv_emms_asm(void); |
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#if HAVE_MMX_INLINE |
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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 /* AVUTIL_X86_EMMS_H */
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