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ffmpeg / libavcodec / x86 / mathops.h @ 199436b9

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/*
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 * simple math operations
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 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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 *
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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 AVCODEC_X86_MATHOPS_H
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#define AVCODEC_X86_MATHOPS_H
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#include "config.h"
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#include "libavutil/common.h"
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#define MULL(ra, rb, shift) \
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        ({ int rt, dummy; __asm__ (\
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            "imull %3               \n\t"\
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            "shrdl %4, %%edx, %%eax \n\t"\
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            : "=a"(rt), "=d"(dummy)\
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            : "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
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         rt; })
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#define MULH(ra, rb) \
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    ({ int rt, dummy;\
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     __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
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     rt; })
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#define MUL64(ra, rb) \
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    ({ int64_t rt;\
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     __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
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     rt; })
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#if HAVE_CMOV
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/* median of 3 */
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#define mid_pred mid_pred
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static inline av_const int mid_pred(int a, int b, int c)
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{
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    int i=b;
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    __asm__ volatile(
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        "cmp    %2, %1 \n\t"
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        "cmovg  %1, %0 \n\t"
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        "cmovg  %2, %1 \n\t"
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        "cmp    %3, %1 \n\t"
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        "cmovl  %3, %1 \n\t"
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        "cmp    %1, %0 \n\t"
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        "cmovg  %1, %0 \n\t"
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        :"+&r"(i), "+&r"(a)
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        :"r"(b), "r"(c)
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    );
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    return i;
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}
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#endif
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#endif /* AVCODEC_X86_MATHOPS_H */