static inline void RENAME(uyvytoyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,

                                      long width, long height,

                                      long lumStride, long chromStride, long srcStride)

{

    long y;

    const x86_reg chromWidth= width>>1;

    for (y=0; y<height; y+=2) {

#if COMPILE_TEMPLATE_MMX

        __asm__ volatile(

            "xor                 %%"REG_a", %%"REG_a"   \n\t"

            "pcmpeqw             %%mm7, %%mm7   \n\t"

            "psrlw                  $8, %%mm7   \n\t" // FF,00,FF,00...

            ".p2align                4          \n\t"

            "1:                                 \n\t"

            PREFETCH" 64(%0, %%"REG_a", 4)          \n\t"

            "movq       (%0, %%"REG_a", 4), %%mm0   \n\t" // UYVY UYVY(0)

            "movq      8(%0, %%"REG_a", 4), %%mm1   \n\t" // UYVY UYVY(4)

            "movq                %%mm0, %%mm2   \n\t" // UYVY UYVY(0)

            "movq                %%mm1, %%mm3   \n\t" // UYVY UYVY(4)

            "pand                %%mm7, %%mm0   \n\t" // U0V0 U0V0(0)

            "pand                %%mm7, %%mm1   \n\t" // U0V0 U0V0(4)

            "psrlw                  $8, %%mm2   \n\t" // Y0Y0 Y0Y0(0)

            "psrlw                  $8, %%mm3   \n\t" // Y0Y0 Y0Y0(4)

            "packuswb            %%mm1, %%mm0   \n\t" // UVUV UVUV(0)

            "packuswb            %%mm3, %%mm2   \n\t" // YYYY YYYY(0)



            MOVNTQ"              %%mm2,  (%1, %%"REG_a", 2) \n\t"



            "movq     16(%0, %%"REG_a", 4), %%mm1   \n\t" // UYVY UYVY(8)

            "movq     24(%0, %%"REG_a", 4), %%mm2   \n\t" // UYVY UYVY(12)

            "movq                %%mm1, %%mm3   \n\t" // UYVY UYVY(8)

            "movq                %%mm2, %%mm4   \n\t" // UYVY UYVY(12)

            "pand                %%mm7, %%mm1   \n\t" // U0V0 U0V0(8)

            "pand                %%mm7, %%mm2   \n\t" // U0V0 U0V0(12)

            "psrlw                  $8, %%mm3   \n\t" // Y0Y0 Y0Y0(8)

            "psrlw                  $8, %%mm4   \n\t" // Y0Y0 Y0Y0(12)

            "packuswb            %%mm2, %%mm1   \n\t" // UVUV UVUV(8)

            "packuswb            %%mm4, %%mm3   \n\t" // YYYY YYYY(8)



            MOVNTQ"              %%mm3, 8(%1, %%"REG_a", 2) \n\t"



            "movq                %%mm0, %%mm2   \n\t" // UVUV UVUV(0)

            "movq                %%mm1, %%mm3   \n\t" // UVUV UVUV(8)

            "psrlw                  $8, %%mm0   \n\t" // V0V0 V0V0(0)

            "psrlw                  $8, %%mm1   \n\t" // V0V0 V0V0(8)

            "pand                %%mm7, %%mm2   \n\t" // U0U0 U0U0(0)

            "pand                %%mm7, %%mm3   \n\t" // U0U0 U0U0(8)

            "packuswb            %%mm1, %%mm0   \n\t" // VVVV VVVV(0)

            "packuswb            %%mm3, %%mm2   \n\t" // UUUU UUUU(0)



            MOVNTQ"              %%mm0, (%3, %%"REG_a") \n\t"

            MOVNTQ"              %%mm2, (%2, %%"REG_a") \n\t"



            "add                    $8, %%"REG_a"   \n\t"

            "cmp                    %4, %%"REG_a"   \n\t"

            " jb                    1b          \n\t"

            ::"r"(src), "r"(ydst), "r"(udst), "r"(vdst), "g" (chromWidth)

            : "memory", "%"REG_a

        );



        ydst += lumStride;

        src  += srcStride;



        __asm__ volatile(

            "xor                 %%"REG_a", %%"REG_a"   \n\t"

            ".p2align                    4          \n\t"

            "1:                                 \n\t"

            PREFETCH" 64(%0, %%"REG_a", 4)          \n\t"

            "movq       (%0, %%"REG_a", 4), %%mm0   \n\t" // YUYV YUYV(0)

            "movq      8(%0, %%"REG_a", 4), %%mm1   \n\t" // YUYV YUYV(4)

            "movq     16(%0, %%"REG_a", 4), %%mm2   \n\t" // YUYV YUYV(8)

            "movq     24(%0, %%"REG_a", 4), %%mm3   \n\t" // YUYV YUYV(12)

            "psrlw                  $8, %%mm0   \n\t" // Y0Y0 Y0Y0(0)

            "psrlw                  $8, %%mm1   \n\t" // Y0Y0 Y0Y0(4)

            "psrlw                  $8, %%mm2   \n\t" // Y0Y0 Y0Y0(8)

            "psrlw                  $8, %%mm3   \n\t" // Y0Y0 Y0Y0(12)

            "packuswb            %%mm1, %%mm0   \n\t" // YYYY YYYY(0)

            "packuswb            %%mm3, %%mm2   \n\t" // YYYY YYYY(8)



            MOVNTQ"              %%mm0,  (%1, %%"REG_a", 2) \n\t"

            MOVNTQ"              %%mm2, 8(%1, %%"REG_a", 2) \n\t"



            "add                    $8, %%"REG_a"   \n\t"

            "cmp                    %4, %%"REG_a"   \n\t"

            " jb                    1b          \n\t"



            ::"r"(src), "r"(ydst), "r"(udst), "r"(vdst), "g" (chromWidth)

            : "memory", "%"REG_a

        );

#else

        long i;

        for (i=0; i<chromWidth; i++) {

            udst[i]     = src[4*i+0];

            ydst[2*i+0] = src[4*i+1];

            vdst[i]     = src[4*i+2];

            ydst[2*i+1] = src[4*i+3];

        }

        ydst += lumStride;

        src  += srcStride;



        for (i=0; i<chromWidth; i++) {

            ydst[2*i+0] = src[4*i+1];

            ydst[2*i+1] = src[4*i+3];

        }

#endif

        udst += chromStride;

        vdst += chromStride;

        ydst += lumStride;

        src  += srcStride;

    }

#if COMPILE_TEMPLATE_MMX

    __asm__ volatile(EMMS"       \n\t"

                     SFENCE"     \n\t"

                     :::"memory");

#endif

}
