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ffmpeg / libavcodec / i386 / dsputil_mmx_qns.h @ be449fca

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/*
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 * DSP utils : QNS functions are compiled 3 times for mmx/3dnow/ssse3
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 * Copyright (c) 2004 Michael Niedermayer
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 *
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 * MMX optimization by Michael Niedermayer <michaelni@gmx.at>
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 * 3DNow! and SSSE3 optimization by Zuxy Meng <zuxy.meng@gmail.com>
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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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/* This header intentionally has no multiple inclusion guards. It is meant to
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 * be included multiple times and generates different code depending on the
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 * value of certain #defines. */
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#define MAX_ABS (512 >> (SCALE_OFFSET>0 ? SCALE_OFFSET : 0))
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static int DEF(try_8x8basis)(int16_t rem[64], int16_t weight[64], int16_t basis[64], int scale)
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{
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    x86_reg i=0;
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    assert(FFABS(scale) < MAX_ABS);
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    scale<<= 16 + SCALE_OFFSET - BASIS_SHIFT + RECON_SHIFT;
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    SET_RND(mm6);
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    __asm__ volatile(
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        "pxor %%mm7, %%mm7              \n\t"
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        "movd  %4, %%mm5                \n\t"
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        "punpcklwd %%mm5, %%mm5         \n\t"
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        "punpcklwd %%mm5, %%mm5         \n\t"
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        ASMALIGN(4)
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        "1:                             \n\t"
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        "movq  (%1, %0), %%mm0          \n\t"
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        "movq  8(%1, %0), %%mm1         \n\t"
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        PMULHRW(%%mm0, %%mm1, %%mm5, %%mm6)
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        "paddw (%2, %0), %%mm0          \n\t"
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        "paddw 8(%2, %0), %%mm1         \n\t"
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        "psraw $6, %%mm0                \n\t"
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        "psraw $6, %%mm1                \n\t"
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        "pmullw (%3, %0), %%mm0         \n\t"
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        "pmullw 8(%3, %0), %%mm1        \n\t"
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        "pmaddwd %%mm0, %%mm0           \n\t"
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        "pmaddwd %%mm1, %%mm1           \n\t"
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        "paddd %%mm1, %%mm0             \n\t"
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        "psrld $4, %%mm0                \n\t"
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        "paddd %%mm0, %%mm7             \n\t"
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        "add $16, %0                    \n\t"
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        "cmp $128, %0                   \n\t" //FIXME optimize & bench
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        " jb 1b                         \n\t"
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        PHADDD(%%mm7, %%mm6)
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        "psrld $2, %%mm7                \n\t"
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        "movd %%mm7, %0                 \n\t"
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        : "+r" (i)
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        : "r"(basis), "r"(rem), "r"(weight), "g"(scale)
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    );
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    return i;
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}
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static void DEF(add_8x8basis)(int16_t rem[64], int16_t basis[64], int scale)
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{
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    x86_reg i=0;
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    if(FFABS(scale) < MAX_ABS){
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        scale<<= 16 + SCALE_OFFSET - BASIS_SHIFT + RECON_SHIFT;
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        SET_RND(mm6);
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        __asm__ volatile(
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                "movd  %3, %%mm5        \n\t"
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                "punpcklwd %%mm5, %%mm5 \n\t"
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                "punpcklwd %%mm5, %%mm5 \n\t"
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                ASMALIGN(4)
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                "1:                     \n\t"
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                "movq  (%1, %0), %%mm0  \n\t"
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                "movq  8(%1, %0), %%mm1 \n\t"
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                PMULHRW(%%mm0, %%mm1, %%mm5, %%mm6)
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                "paddw (%2, %0), %%mm0  \n\t"
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                "paddw 8(%2, %0), %%mm1 \n\t"
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                "movq %%mm0, (%2, %0)   \n\t"
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                "movq %%mm1, 8(%2, %0)  \n\t"
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                "add $16, %0            \n\t"
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                "cmp $128, %0           \n\t" // FIXME optimize & bench
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                " jb 1b                 \n\t"
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                : "+r" (i)
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                : "r"(basis), "r"(rem), "g"(scale)
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        );
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    }else{
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        for(i=0; i<8*8; i++){
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            rem[i] += (basis[i]*scale + (1<<(BASIS_SHIFT - RECON_SHIFT-1)))>>(BASIS_SHIFT - RECON_SHIFT);
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        }
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    }
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}