func: static inline void RENAME(yuy2toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
  
  	unsigned int width, unsigned int height,
  
  	int lumStride, int chromStride, int srcStride)
  
  {
  
  	unsigned y;
  
  	const unsigned chromWidth= width>>1;
  
  	for(y=0; y<height; y+=2)
  
  	{
  
  #ifdef HAVE_MMX
  
  		asm volatile(
  
  			"xor %%"REG_a", %%"REG_a"	\n\t"
  
  			"pcmpeqw %%mm7, %%mm7		\n\t"
  
  			"psrlw $8, %%mm7		\n\t" // FF,00,FF,00...
  
  			".balign 16			\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 %%mm0, %%mm2		\n\t" // YUYV YUYV(0)
  
  			"movq %%mm1, %%mm3		\n\t" // YUYV YUYV(4)
  
  			"psrlw $8, %%mm0		\n\t" // U0V0 U0V0(0)
  
  			"psrlw $8, %%mm1		\n\t" // U0V0 U0V0(4)
  
  			"pand %%mm7, %%mm2		\n\t" // Y0Y0 Y0Y0(0)
  
  			"pand %%mm7, %%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" // YUYV YUYV(8)
  
  			"movq 24(%0, %%"REG_a", 4), %%mm2\n\t" // YUYV YUYV(12)
  
  			"movq %%mm1, %%mm3		\n\t" // YUYV YUYV(8)
  
  			"movq %%mm2, %%mm4		\n\t" // YUYV YUYV(12)
  
  			"psrlw $8, %%mm1		\n\t" // U0V0 U0V0(8)
  
  			"psrlw $8, %%mm2		\n\t" // U0V0 U0V0(12)
  
  			"pand %%mm7, %%mm3		\n\t" // Y0Y0 Y0Y0(8)
  
  			"pand %%mm7, %%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" ((long)chromWidth)
  
  			: "memory", "%"REG_a
  
  		);
  
  
  
  		ydst += lumStride;
  
  		src  += srcStride;
  
  
  
  		asm volatile(
  
  			"xor %%"REG_a", %%"REG_a"	\n\t"
  
  			".balign 16			\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)
  
  			"pand %%mm7, %%mm0		\n\t" // Y0Y0 Y0Y0(0)
  
  			"pand %%mm7, %%mm1		\n\t" // Y0Y0 Y0Y0(4)
  
  			"pand %%mm7, %%mm2		\n\t" // Y0Y0 Y0Y0(8)
  
  			"pand %%mm7, %%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" ((long)chromWidth)
  
  			: "memory", "%"REG_a
  
  		);
  
  #else
  
  		unsigned i;
  
  		for(i=0; i<chromWidth; i++)
  
  		{
  
  			ydst[2*i+0] 	= src[4*i+0];
  
  			udst[i] 	= src[4*i+1];
  
  			ydst[2*i+1] 	= src[4*i+2];
  
  			vdst[i] 	= src[4*i+3];
  
  		}
  
  		ydst += lumStride;
  
  		src  += srcStride;
  
  
  
  		for(i=0; i<chromWidth; i++)
  
  		{
  
  			ydst[2*i+0] 	= src[4*i+0];
  
  			ydst[2*i+1] 	= src[4*i+2];
  
  		}
  
  #endif
  
  		udst += chromStride;
  
  		vdst += chromStride;
  
  		ydst += lumStride;
  
  		src  += srcStride;
  
  	}
  
  #ifdef HAVE_MMX
  
  asm volatile(   EMMS" \n\t"
  
          	SFENCE" \n\t"
  
          	:::"memory");
  
  #endif
  
  }
  