path: root/libswscale/yuv2rgb_template.c

/*
 * yuv2rgb_mmx.c, Software YUV to RGB converter with Intel MMX "technology"
 *
 * Copyright (C) 2000, Silicon Integrated System Corp.
 *
 * Author: Olie Lho <ollie@sis.com.tw>
 *
 * 15,24 bpp and dithering from Michael Niedermayer (michaelni@gmx.at)
 * MMX/MMX2 Template stuff from Michael Niedermayer (needed for fast movntq support)
 * context / deglobalize stuff by Michael Niedermayer
 *
 * This file is part of mpeg2dec, a free MPEG-2 video decoder
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * mpeg2dec 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with mpeg2dec; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#undef MOVNTQ
#undef EMMS
#undef SFENCE

#ifdef HAVE_3DNOW
/* On K6 femms is faster of emms. On K7 femms is directly mapped on emms. */
#define EMMS     "femms"
#else
#define EMMS     "emms"
#endif

#ifdef HAVE_MMX2
#define MOVNTQ "movntq"
#define SFENCE "sfence"
#else
#define MOVNTQ "movq"
#define SFENCE "/nop"
#endif

#define YUV2RGB \
    /* Do the multiply part of the conversion for even and odd pixels,
       register usage:
       mm0 -> Cblue, mm1 -> Cred, mm2 -> Cgreen even pixels,
       mm3 -> Cblue, mm4 -> Cred, mm5 -> Cgreen odd pixels,
       mm6 -> Y even, mm7 -> Y odd */\
    /* convert the chroma part */\
    "punpcklbw %%mm4, %%mm0;" /* scatter 4 Cb 00 u3 00 u2 00 u1 00 u0 */ \
    "punpcklbw %%mm4, %%mm1;" /* scatter 4 Cr 00 v3 00 v2 00 v1 00 v0 */ \
\
    "psllw $3, %%mm0;" /* Promote precision */ \
    "psllw $3, %%mm1;" /* Promote precision */ \
\
    "psubsw "U_OFFSET"(%4), %%mm0;" /* Cb -= 128 */ \
    "psubsw "V_OFFSET"(%4), %%mm1;" /* Cr -= 128 */ \
\
    "movq %%mm0, %%mm2;" /* Copy 4 Cb 00 u3 00 u2 00 u1 00 u0 */ \
    "movq %%mm1, %%mm3;" /* Copy 4 Cr 00 v3 00 v2 00 v1 00 v0 */ \
\
    "pmulhw "UG_COEFF"(%4), %%mm2;" /* Mul Cb with green coeff -> Cb green */ \
    "pmulhw "VG_COEFF"(%4), %%mm3;" /* Mul Cr with green coeff -> Cr green */ \
\
    "pmulhw "UB_COEFF"(%4), %%mm0;" /* Mul Cb -> Cblue 00 b3 00 b2 00 b1 00 b0 */\
    "pmulhw "VR_COEFF"(%4), %%mm1;" /* Mul Cr -> Cred 00 r3 00 r2 00 r1 00 r0 */\
\
    "paddsw %%mm3, %%mm2;" /* Cb green + Cr green -> Cgreen */\
\
    /* convert the luma part */\
    "movq %%mm6, %%mm7;" /* Copy 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */\
    "pand "MANGLE(mmx_00ffw)", %%mm6;" /* get Y even 00 Y6 00 Y4 00 Y2 00 Y0 */\
\
    "psrlw $8, %%mm7;" /* get Y odd 00 Y7 00 Y5 00 Y3 00 Y1 */\
\
    "psllw $3, %%mm6;" /* Promote precision */\
    "psllw $3, %%mm7;" /* Promote precision */\
\
    "psubw "Y_OFFSET"(%4), %%mm6;" /* Y -= 16 */\
    "psubw "Y_OFFSET"(%4), %%mm7;" /* Y -= 16 */\
\
    "pmulhw "Y_COEFF"(%4), %%mm6;" /* Mul 4 Y even 00 y6 00 y4 00 y2 00 y0 */\
    "pmulhw "Y_COEFF"(%4), %%mm7;" /* Mul 4 Y odd 00 y7 00 y5 00 y3 00 y1 */\
\
    /* Do the addition part of the conversion for even and odd pixels,
       register usage:
       mm0 -> Cblue, mm1 -> Cred, mm2 -> Cgreen even pixels,
       mm3 -> Cblue, mm4 -> Cred, mm5 -> Cgreen odd pixels,
       mm6 -> Y even, mm7 -> Y odd */\
    "movq %%mm0, %%mm3;" /* Copy Cblue */\
    "movq %%mm1, %%mm4;" /* Copy Cred */\
    "movq %%mm2, %%mm5;" /* Copy Cgreen */\
\
    "paddsw %%mm6, %%mm0;" /* Y even + Cblue 00 B6 00 B4 00 B2 00 B0 */\
    "paddsw %%mm7, %%mm3;" /* Y odd + Cblue 00 B7 00 B5 00 B3 00 B1 */\
\
    "paddsw %%mm6, %%mm1;" /* Y even + Cred 00 R6 00 R4 00 R2 00 R0 */\
    "paddsw %%mm7, %%mm4;" /* Y odd + Cred 00 R7 00 R5 00 R3 00 R1 */\
\
    "paddsw %%mm6, %%mm2;" /* Y even + Cgreen 00 G6 00 G4 00 G2 00 G0 */\
    "paddsw %%mm7, %%mm5;" /* Y odd + Cgreen 00 G7 00 G5 00 G3 00 G1 */\
\
    /* Limit RGB even to 0..255 */\
    "packuswb %%mm0, %%mm0;" /* B6 B4 B2 B0  B6 B4 B2 B0 */\
    "packuswb %%mm1, %%mm1;" /* R6 R4 R2 R0  R6 R4 R2 R0 */\
    "packuswb %%mm2, %%mm2;" /* G6 G4 G2 G0  G6 G4 G2 G0 */\
\
    /* Limit RGB odd to 0..255 */\
    "packuswb %%mm3, %%mm3;" /* B7 B5 B3 B1  B7 B5 B3 B1 */\
    "packuswb %%mm4, %%mm4;" /* R7 R5 R3 R1  R7 R5 R3 R1 */\
    "packuswb %%mm5, %%mm5;" /* G7 G5 G3 G1  G7 G5 G3 G1 */\
\
    /* Interleave RGB even and odd */\
    "punpcklbw %%mm3, %%mm0;" /* B7 B6 B5 B4 B3 B2 B1 B0 */\
    "punpcklbw %%mm4, %%mm1;" /* R7 R6 R5 R4 R3 R2 R1 R0 */\
    "punpcklbw %%mm5, %%mm2;" /* G7 G6 G5 G4 G3 G2 G1 G0 */\


static inline int RENAME(yuv420_rgb16)(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
                                       int srcSliceH, uint8_t* dst[], int dstStride[]){
    int y, h_size;

    if(c->srcFormat == PIX_FMT_YUV422P){
        srcStride[1] *= 2;
        srcStride[2] *= 2;
    }

    h_size= (c->dstW+7)&~7;
    if(h_size*2 > FFABS(dstStride[0])) h_size-=8;

    asm volatile ("pxor %mm4, %mm4;" /* zero mm4 */ );
    //printf("%X %X %X %X %X %X %X %X %X %X\n", (int)&c->redDither, (int)&b5Dither, (int)src[0], (int)src[1], (int)src[2], (int)dst[0],
    //srcStride[0],srcStride[1],srcStride[2],dstStride[0]);
    for (y= 0; y<srcSliceH; y++ ) {
        uint8_t *image = dst[0] + (y+srcSliceY)*dstStride[0];
        uint8_t *py = src[0] + y*srcStride[0];
        uint8_t *pu = src[1] + (y>>1)*srcStride[1];
        uint8_t *pv = src[2] + (y>>1)*srcStride[2];
        long index= -h_size/2;

        b5Dither= ff_dither8[y&1];
        g6Dither= ff_dither4[y&1];
        g5Dither= ff_dither8[y&1];
        r5Dither= ff_dither8[(y+1)&1];
        /* this mmx assembly code deals with SINGLE scan line at a time, it convert 8
           pixels in each iteration */
        asm volatile (
        /* load data for start of next scan line */
        "movd    (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */
        "movd    (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
        "movq (%5, %0, 2), %%mm6;" /* Load 8  Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        //".balign 16     \n\t"
        "1:             \n\t"
        /* no speed diference on my p3@500 with prefetch,
         * if it is faster for anyone with -benchmark then tell me
        PREFETCH" 64(%0) \n\t"
        PREFETCH" 64(%1) \n\t"
        PREFETCH" 64(%2) \n\t"
        */
YUV2RGB

#ifdef DITHER1XBPP
        "paddusb "MANGLE(b5Dither)", %%mm0;"
        "paddusb "MANGLE(g6Dither)", %%mm2;"
        "paddusb "MANGLE(r5Dither)", %%mm1;"
#endif
        /* mask unneeded bits off */
        "pand "MANGLE(mmx_redmask)", %%mm0;" /* b7b6b5b4 b3_0_0_0 b7b6b5b4 b3_0_0_0 */
        "pand "MANGLE(mmx_grnmask)", %%mm2;" /* g7g6g5g4 g3g2_0_0 g7g6g5g4 g3g2_0_0 */
        "pand "MANGLE(mmx_redmask)", %%mm1;" /* r7r6r5r4 r3_0_0_0 r7r6r5r4 r3_0_0_0 */

        "psrlw   $3, %%mm0;" /* 0_0_0_b7 b6b5b4b3 0_0_0_b7 b6b5b4b3 */
        "pxor %%mm4, %%mm4;" /* zero mm4 */

        "movq %%mm0, %%mm5;" /* Copy B7-B0 */
        "movq %%mm2, %%mm7;" /* Copy G7-G0 */

        /* convert rgb24 plane to rgb16 pack for pixel 0-3 */
        "punpcklbw %%mm4, %%mm2;" /* 0_0_0_0 0_0_0_0 g7g6g5g4 g3g2_0_0 */
        "punpcklbw %%mm1, %%mm0;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */

        "psllw  $3, %%mm2;" /* 0_0_0_0 0_g7g6g5 g4g3g2_0 0_0_0_0 */
        "por %%mm2, %%mm0;" /* r7r6r5r4 r3g7g6g5 g4g3g2b7 b6b5b4b3 */

        "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        MOVNTQ "      %%mm0, (%1);" /* store pixel 0-3 */

        /* convert rgb24 plane to rgb16 pack for pixel 0-3 */
        "punpckhbw %%mm4, %%mm7;" /* 0_0_0_0 0_0_0_0 g7g6g5g4 g3g2_0_0 */
        "punpckhbw %%mm1, %%mm5;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */

        "psllw        $3, %%mm7;" /* 0_0_0_0 0_g7g6g5 g4g3g2_0 0_0_0_0 */
        "movd 4 (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */

        "por       %%mm7, %%mm5;" /* r7r6r5r4 r3g7g6g5 g4g3g2b7 b6b5b4b3 */
        "movd 4 (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */

        MOVNTQ "   %%mm5, 8 (%1);" /* store pixel 4-7 */

        "add $16, %1    \n\t"
        "add  $4, %0    \n\t"
        " js  1b        \n\t"

        : "+r" (index), "+r" (image)
        : "r" (pu - index), "r" (pv - index), "r"(&c->redDither), "r" (py - 2*index)
        );
    }

    asm volatile (EMMS);

    return srcSliceH;
}

static inline int RENAME(yuv420_rgb15)(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
                                       int srcSliceH, uint8_t* dst[], int dstStride[]){
    int y, h_size;

    if(c->srcFormat == PIX_FMT_YUV422P){
        srcStride[1] *= 2;
        srcStride[2] *= 2;
    }

    h_size= (c->dstW+7)&~7;
    if(h_size*2 > FFABS(dstStride[0])) h_size-=8;

    asm volatile ("pxor %mm4, %mm4;" /* zero mm4 */ );
    //printf("%X %X %X %X %X %X %X %X %X %X\n", (int)&c->redDither, (int)&b5Dither, (int)src[0], (int)src[1], (int)src[2], (int)dst[0],
    //srcStride[0],srcStride[1],srcStride[2],dstStride[0]);
    for (y= 0; y<srcSliceH; y++ ) {
        uint8_t *image = dst[0] + (y+srcSliceY)*dstStride[0];
        uint8_t *py = src[0] + y*srcStride[0];
        uint8_t *pu = src[1] + (y>>1)*srcStride[1];
        uint8_t *pv = src[2] + (y>>1)*srcStride[2];
        long index= -h_size/2;

        b5Dither= ff_dither8[y&1];
        g6Dither= ff_dither4[y&1];
        g5Dither= ff_dither8[y&1];
        r5Dither= ff_dither8[(y+1)&1];
        /* this mmx assembly code deals with SINGLE scan line at a time, it convert 8
           pixels in each iteration */
        asm volatile (
        /* load data for start of next scan line */
        "movd    (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */
        "movd    (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
        "movq (%5, %0, 2), %%mm6;" /* Load 8  Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        //".balign 16     \n\t"
        "1:             \n\t"
YUV2RGB

#ifdef DITHER1XBPP
        "paddusb "MANGLE(b5Dither)", %%mm0  \n\t"
        "paddusb "MANGLE(g5Dither)", %%mm2  \n\t"
        "paddusb "MANGLE(r5Dither)", %%mm1  \n\t"
#endif

        /* mask unneeded bits off */
        "pand "MANGLE(mmx_redmask)", %%mm0;" /* b7b6b5b4 b3_0_0_0 b7b6b5b4 b3_0_0_0 */
        "pand "MANGLE(mmx_redmask)", %%mm2;" /* g7g6g5g4 g3_0_0_0 g7g6g5g4 g3_0_0_0 */
        "pand "MANGLE(mmx_redmask)", %%mm1;" /* r7r6r5r4 r3_0_0_0 r7r6r5r4 r3_0_0_0 */

        "psrlw   $3, %%mm0;" /* 0_0_0_b7 b6b5b4b3 0_0_0_b7 b6b5b4b3 */
        "psrlw   $1, %%mm1;" /* 0_r7r6r5  r4r3_0_0 0_r7r6r5 r4r3_0_0 */
        "pxor %%mm4, %%mm4;" /* zero mm4 */

        "movq %%mm0, %%mm5;" /* Copy B7-B0 */
        "movq %%mm2, %%mm7;" /* Copy G7-G0 */

        /* convert rgb24 plane to rgb16 pack for pixel 0-3 */
        "punpcklbw %%mm4, %%mm2;" /* 0_0_0_0 0_0_0_0 g7g6g5g4 g3_0_0_0 */
        "punpcklbw %%mm1, %%mm0;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */

        "psllw  $2, %%mm2;" /* 0_0_0_0 0_0_g7g6 g5g4g3_0 0_0_0_0 */
        "por %%mm2, %%mm0;" /* 0_r7r6r5 r4r3g7g6 g5g4g3b7 b6b5b4b3 */

        "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        MOVNTQ "      %%mm0, (%1);"  /* store pixel 0-3 */

        /* convert rgb24 plane to rgb16 pack for pixel 0-3 */
        "punpckhbw %%mm4, %%mm7;" /* 0_0_0_0 0_0_0_0 0_g7g6g5 g4g3_0_0 */
        "punpckhbw %%mm1, %%mm5;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */

        "psllw        $2, %%mm7;" /* 0_0_0_0 0_0_g7g6 g5g4g3_0 0_0_0_0 */
        "movd 4 (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */

        "por       %%mm7, %%mm5;" /* 0_r7r6r5 r4r3g7g6 g5g4g3b7 b6b5b4b3 */
        "movd 4 (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */

        MOVNTQ " %%mm5, 8 (%1);" /* store pixel 4-7 */

        "add $16, %1            \n\t"
        "add $4, %0             \n\t"
        " js 1b                 \n\t"
        : "+r" (index), "+r" (image)
        : "r" (pu - index), "r" (pv - index), "r"(&c->redDither), "r" (py - 2*index)
        );
    }

    asm volatile (EMMS);
    return srcSliceH;
}

static inline int RENAME(yuv420_rgb24)(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
                                       int srcSliceH, uint8_t* dst[], int dstStride[]){
    int y, h_size;

    if(c->srcFormat == PIX_FMT_YUV422P){
        srcStride[1] *= 2;
        srcStride[2] *= 2;
    }

    h_size= (c->dstW+7)&~7;
    if(h_size*3 > FFABS(dstStride[0])) h_size-=8;

    asm volatile ("pxor %mm4, %mm4;" /* zero mm4 */ );

    for (y= 0; y<srcSliceH; y++ ) {
        uint8_t *image = dst[0] + (y+srcSliceY)*dstStride[0];
        uint8_t *py = src[0] + y*srcStride[0];
        uint8_t *pu = src[1] + (y>>1)*srcStride[1];
        uint8_t *pv = src[2] + (y>>1)*srcStride[2];
        long index= -h_size/2;

        /* this mmx assembly code deals with SINGLE scan line at a time, it convert 8
           pixels in each iteration */
        asm volatile (
        /* load data for start of next scan line */
        "movd    (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */
        "movd    (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
        "movq (%5, %0, 2), %%mm6;" /* Load 8  Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        //".balign 16     \n\t"
        "1:             \n\t"
YUV2RGB
        /* mm0=B, %%mm2=G, %%mm1=R */
#ifdef HAVE_MMX2
        "movq "MANGLE(ff_M24A)", %%mm4     \n\t"
        "movq "MANGLE(ff_M24C)", %%mm7     \n\t"
        "pshufw $0x50, %%mm0, %%mm5     \n\t" /* B3 B2 B3 B2  B1 B0 B1 B0 */
        "pshufw $0x50, %%mm2, %%mm3     \n\t" /* G3 G2 G3 G2  G1 G0 G1 G0 */
        "pshufw $0x00, %%mm1, %%mm6     \n\t" /* R1 R0 R1 R0  R1 R0 R1 R0 */

        "pand   %%mm4, %%mm5            \n\t" /*    B2        B1       B0 */
        "pand   %%mm4, %%mm3            \n\t" /*    G2        G1       G0 */
        "pand   %%mm7, %%mm6            \n\t" /*       R1        R0       */

        "psllq     $8, %%mm3            \n\t" /* G2        G1       G0    */
        "por    %%mm5, %%mm6            \n\t"
        "por    %%mm3, %%mm6            \n\t"
        MOVNTQ" %%mm6, (%1)             \n\t"

        "psrlq     $8, %%mm2            \n\t" /* 00 G7 G6 G5  G4 G3 G2 G1 */
        "pshufw $0xA5, %%mm0, %%mm5     \n\t" /* B5 B4 B5 B4  B3 B2 B3 B2 */
        "pshufw $0x55, %%mm2, %%mm3     \n\t" /* G4 G3 G4 G3  G4 G3 G4 G3 */
        "pshufw $0xA5, %%mm1, %%mm6     \n\t" /* R5 R4 R5 R4  R3 R2 R3 R2 */

        "pand "MANGLE(ff_M24B)", %%mm5     \n\t" /* B5       B4        B3    */
        "pand          %%mm7, %%mm3     \n\t" /*       G4        G3       */
        "pand          %%mm4, %%mm6     \n\t" /*    R4        R3       R2 */

        "por    %%mm5, %%mm3            \n\t" /* B5    G4 B4     G3 B3    */
        "por    %%mm3, %%mm6            \n\t"
        MOVNTQ" %%mm6, 8(%1)            \n\t"

        "pshufw $0xFF, %%mm0, %%mm5     \n\t" /* B7 B6 B7 B6  B7 B6 B6 B7 */
        "pshufw $0xFA, %%mm2, %%mm3     \n\t" /* 00 G7 00 G7  G6 G5 G6 G5 */
        "pshufw $0xFA, %%mm1, %%mm6     \n\t" /* R7 R6 R7 R6  R5 R4 R5 R4 */
        "movd 4 (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */

        "pand          %%mm7, %%mm5     \n\t" /*       B7        B6       */
        "pand          %%mm4, %%mm3     \n\t" /*    G7        G6       G5 */
        "pand "MANGLE(ff_M24B)", %%mm6     \n\t" /* R7       R6        R5    */
        "movd 4 (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
\
        "por          %%mm5, %%mm3      \n\t"
        "por          %%mm3, %%mm6      \n\t"
        MOVNTQ"       %%mm6, 16(%1)     \n\t"
        "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        "pxor         %%mm4, %%mm4      \n\t"

#else

        "pxor      %%mm4, %%mm4     \n\t"
        "movq      %%mm0, %%mm5     \n\t" /* B */
        "movq      %%mm1, %%mm6     \n\t" /* R */
        "punpcklbw %%mm2, %%mm0     \n\t" /* GBGBGBGB 0 */
        "punpcklbw %%mm4, %%mm1     \n\t" /* 0R0R0R0R 0 */
        "punpckhbw %%mm2, %%mm5     \n\t" /* GBGBGBGB 2 */
        "punpckhbw %%mm4, %%mm6     \n\t" /* 0R0R0R0R 2 */
        "movq      %%mm0, %%mm7     \n\t" /* GBGBGBGB 0 */
        "movq      %%mm5, %%mm3     \n\t" /* GBGBGBGB 2 */
        "punpcklwd %%mm1, %%mm7     \n\t" /* 0RGB0RGB 0 */
        "punpckhwd %%mm1, %%mm0     \n\t" /* 0RGB0RGB 1 */
        "punpcklwd %%mm6, %%mm5     \n\t" /* 0RGB0RGB 2 */
        "punpckhwd %%mm6, %%mm3     \n\t" /* 0RGB0RGB 3 */

        "movq      %%mm7, %%mm2     \n\t" /* 0RGB0RGB 0 */
        "movq      %%mm0, %%mm6     \n\t" /* 0RGB0RGB 1 */
        "movq      %%mm5, %%mm1     \n\t" /* 0RGB0RGB 2 */
        "movq      %%mm3, %%mm4     \n\t" /* 0RGB0RGB 3 */

        "psllq       $40, %%mm7     \n\t" /* RGB00000 0 */
        "psllq       $40, %%mm0     \n\t" /* RGB00000 1 */
        "psllq       $40, %%mm5     \n\t" /* RGB00000 2 */
        "psllq       $40, %%mm3     \n\t" /* RGB00000 3 */

        "punpckhdq %%mm2, %%mm7     \n\t" /* 0RGBRGB0 0 */
        "punpckhdq %%mm6, %%mm0     \n\t" /* 0RGBRGB0 1 */
        "punpckhdq %%mm1, %%mm5     \n\t" /* 0RGBRGB0 2 */
        "punpckhdq %%mm4, %%mm3     \n\t" /* 0RGBRGB0 3 */

        "psrlq        $8, %%mm7     \n\t" /* 00RGBRGB 0 */
        "movq      %%mm0, %%mm6     \n\t" /* 0RGBRGB0 1 */
        "psllq       $40, %%mm0     \n\t" /* GB000000 1 */
        "por       %%mm0, %%mm7     \n\t" /* GBRGBRGB 0 */
        MOVNTQ"    %%mm7, (%1)      \n\t"

        "movd 4 (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */

        "psrlq       $24, %%mm6     \n\t" /* 0000RGBR 1 */
        "movq      %%mm5, %%mm1     \n\t" /* 0RGBRGB0 2 */
        "psllq       $24, %%mm5     \n\t" /* BRGB0000 2 */
        "por       %%mm5, %%mm6     \n\t" /* BRGBRGBR 1 */
        MOVNTQ"    %%mm6, 8(%1)     \n\t"

        "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */

        "psrlq       $40, %%mm1     \n\t" /* 000000RG 2 */
        "psllq        $8, %%mm3     \n\t" /* RGBRGB00 3 */
        "por       %%mm3, %%mm1     \n\t" /* RGBRGBRG 2 */
        MOVNTQ"    %%mm1, 16(%1)    \n\t"

        "movd 4 (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
        "pxor      %%mm4, %%mm4     \n\t"
#endif

        "add $24, %1    \n\t"
        "add  $4, %0    \n\t"
        " js  1b        \n\t"

        : "+r" (index), "+r" (image)
        : "r" (pu - index), "r" (pv - index), "r"(&c->redDither), "r" (py - 2*index)
        );
    }

    asm volatile (EMMS);
    return srcSliceH;
}

static inline int RENAME(yuv420_rgb32)(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
                                       int srcSliceH, uint8_t* dst[], int dstStride[]){
    int y, h_size;

    if(c->srcFormat == PIX_FMT_YUV422P){
        srcStride[1] *= 2;
        srcStride[2] *= 2;
    }

    h_size= (c->dstW+7)&~7;
    if(h_size*4 > FFABS(dstStride[0])) h_size-=8;

    asm volatile ("pxor %mm4, %mm4;" /* zero mm4 */ );

    for (y= 0; y<srcSliceH; y++ ) {
        uint8_t *image = dst[0] + (y+srcSliceY)*dstStride[0];
        uint8_t *py = src[0] + y*srcStride[0];
        uint8_t *pu = src[1] + (y>>1)*srcStride[1];
        uint8_t *pv = src[2] + (y>>1)*srcStride[2];
        long index= -h_size/2;

        /* this mmx assembly code deals with SINGLE scan line at a time, it convert 8
           pixels in each iteration */
        asm volatile (
        /* load data for start of next scan line */
        "movd    (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */
        "movd    (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */
        "movq (%5, %0, 2), %%mm6;" /* Load 8  Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */
        //".balign 16     \n\t"
        "1:             \n\t"
YUV2RGB
        /* convert RGB plane to RGB packed format,
           mm0 ->  B, mm1 -> R, mm2 -> G, mm3 -> 0,
           mm4 -> GB, mm5 -> AR pixel 4-7,
           mm6 -> GB, mm7 -> AR pixel 0-3 */
        "pxor      %%mm3, %%mm3;"   /* zero mm3 */

        "movq      %%mm0, %%mm6;"   /* B7 B6 B5 B4 B3 B2 B1 B0 */
        "movq      %%mm1, %%mm7;"   /* R7 R6 R5 R4 R3 R2 R1 R0 */

        "movq      %%mm0, %%mm4;"   /* B7 B6 B5 B4 B3 B2 B1 B0 */
        "movq      %%mm1, %%mm5;"   /* R7 R6 R5 R4 R3 R2 R1 R0 */

        "punpcklbw %%mm2, %%mm6;"   /* G3 B3 G2 B2 G1 B1 G0 B0 */
        "punpcklbw %%mm3, %%mm7;"   /* 00 R3 00 R2 00 R1 00 R0 */

        "punpcklwd %%mm7, %%mm6;"   /* 00 R1 B1 G1 00 R0 B0 G0 */
        MOVNTQ "   %%mm6, (%1);"    /* Store ARGB1 ARGB0 */

        "movq      %%mm0, %%mm6;"   /* B7 B6 B5 B4 B3 B2 B1 B0 */
        "punpcklbw %%mm2, %%mm6;"   /* G3 B3 G2 B2 G1 B1 G0 B0 */

        "punpckhwd %%mm7, %%mm6;"   /* 00 R3 G3 B3 00 R2 B3 G2 */
        MOVNTQ "   %%mm6, 8 (%1);"  /* Store ARGB3 ARGB2 */

        "punpckhbw %%mm2, %%mm4;"   /* G7 B7 G6 B6 G5 B5 G4 B4 */
        "punpckhbw %%mm3, %%mm5;"   /* 00 R7 00 R6 00 R5 00 R4 */

        "punpcklwd %%mm5, %%mm4;"   /* 00 R5 B5 G5 00 R4 B4 G4 */
        MOVNTQ "   %%mm4, 16 (%1);" /* Store ARGB5 ARGB4 */

        "movq      %%mm0, %%mm4;"   /* B7 B6 B5 B4 B3 B2 B1 B0 */
        "punpckhbw %%mm2, %%mm4;"   /* G7 B7 G6 B6 G5 B5 G4 B4 */

        "punpckhwd %%mm5, %%mm4;"   /* 00 R7 G7 B7 00 R6 B6 G6 */
        MOVNTQ "   %%mm4, 24 (%1);" /* Store ARGB7 ARGB6 */

        "movd 4 (%2, %0), %%mm0;"   /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */
        "movd 4 (%3, %0), %%mm1;"   /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */

        "pxor         %%mm4, %%mm4;" /* zero mm4 */
        "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */

        "add $32, %1    \n\t"
        "add  $4, %0    \n\t"
        " js  1b        \n\t"

        : "+r" (index), "+r" (image)
        : "r" (pu - index), "r" (pv - index), "r"(&c->redDither), "r" (py - 2*index)
        );
    }

    asm volatile (EMMS);
    return srcSliceH;
}