chromium/third_party/ffmpeg/libavcodec/x86/mathops.h

/*
 * simple math operations
 * Copyright (c) 2006 Michael Niedermayer <[email protected]> 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"
#include "libavutil/x86/asm.h"

#if HAVE_INLINE_ASM

#if ARCH_X86_32

#define MULL …
static av_always_inline av_const int MULL(int a, int b, unsigned shift)
{
    int rt, dummy;
    if (__builtin_constant_p(shift))
    __asm__ (
        "imull %3               \n\t"
        "shrdl %4, %%edx, %%eax \n\t"
        :"=a"(rt), "=d"(dummy)
        :"a"(a), "rm"(b), "i"(shift & 0x1F)
    );
    else
        __asm__ (
            "imull %3               \n\t"
            "shrdl %4, %%edx, %%eax \n\t"
            :"=a"(rt), "=d"(dummy)
            :"a"(a), "rm"(b), "c"((uint8_t)shift)
        );
    return rt;
}

#define MULH …
static av_always_inline av_const int MULH(int a, int b)
{
    int rt, dummy;
    __asm__ (
        "imull %3"
        :"=d"(rt), "=a"(dummy)
        :"a"(a), "rm"(b)
    );
    return rt;
}

#define MUL64 …
static av_always_inline av_const int64_t MUL64(int a, int b)
{
    int64_t rt;
    __asm__ (
        "imull %2"
        :"=A"(rt)
        :"a"(a), "rm"(b)
    );
    return rt;
}

#endif /* ARCH_X86_32 */

#if HAVE_I686
/* median of 3 */
#define mid_pred …
static inline av_const int mid_pred(int a, int b, int c)
{ … }

#if HAVE_6REGS
#define COPY3_IF_LT(x, y, a, b, c, d) …
#endif /* HAVE_6REGS */

#endif /* HAVE_I686 */

#define MASK_ABS(mask, level) …

// avoid +32 for shift optimization (gcc should do that ...)
#define NEG_SSR32 …
static inline  int32_t NEG_SSR32( int32_t a, int8_t s){ … }

#define NEG_USR32 …
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ … }

#endif /* HAVE_INLINE_ASM */
#endif /* AVCODEC_X86_MATHOPS_H */