PeerStreamer

/*

 * simple math operations

 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al

 *

 * 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 AVCODEC_X86_MATHOPS_H

#define AVCODEC_X86_MATHOPS_H

#include "config.h"

#include "libavutil/common.h"

#if ARCH_X86_32

#define MULL(ra, rb, shift) \

        ({ int rt, dummy; __asm__ (\

            "imull %3               \n\t"\

            "shrdl %4, %%edx, %%eax \n\t"\

            : "=a"(rt), "=d"(dummy)\

            : "a" ((int)(ra)), "rm" ((int)(rb)), "i"(shift));\

         rt; })

#define MULH(ra, rb) \

    ({ int rt, dummy;\

     __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)(ra)), "rm" ((int)(rb)));\

     rt; })

#define MUL64(ra, rb) \

    ({ int64_t rt;\

     __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)(ra)), "g" ((int)(rb)));\

     rt; })

#endif

#if HAVE_CMOV

/* median of 3 */

#define mid_pred mid_pred

static inline av_const int mid_pred(int a, int b, int c)

{

    int i=b;

    __asm__ volatile(

        "cmp    %2, %1 \n\t"

        "cmovg  %1, %0 \n\t"

        "cmovg  %2, %1 \n\t"

        "cmp    %3, %1 \n\t"

        "cmovl  %3, %1 \n\t"

        "cmp    %1, %0 \n\t"

        "cmovg  %1, %0 \n\t"

        :"+&r"(i), "+&r"(a)

        :"r"(b), "r"(c)

    );

    return i;

}

#endif

#if HAVE_CMOV

#define COPY3_IF_LT(x, y, a, b, c, d)\

__asm__ volatile(\

    "cmpl  %0, %3       \n\t"\

    "cmovl %3, %0       \n\t"\

    "cmovl %4, %1       \n\t"\

    "cmovl %5, %2       \n\t"\

    : "+&r" (x), "+&r" (a), "+r" (c)\

    : "r" (y), "r" (b), "r" (d)\

);

#endif

// avoid +32 for shift optimization (gcc should do that ...)

#define NEG_SSR32 NEG_SSR32

static inline  int32_t NEG_SSR32( int32_t a, int8_t s){

    __asm__ ("sarl %1, %0\n\t"

         : "+r" (a)

         : "ic" ((uint8_t)(-s))

    );

    return a;

}

#define NEG_USR32 NEG_USR32

static inline uint32_t NEG_USR32(uint32_t a, int8_t s){

    __asm__ ("shrl %1, %0\n\t"

         : "+r" (a)

         : "ic" ((uint8_t)(-s))

    );

    return a;

}

#endif /* AVCODEC_X86_MATHOPS_H */