+#ifdef HAVE_MMX
+ asm volatile(
+ "movl %4, %%eax \n\t"
+ "movq "MANGLE(w1111)", %%mm5 \n\t"
+ "movq "MANGLE(bgr2UCoeff)", %%mm6 \n\t"
+ "pxor %%mm7, %%mm7 \n\t"
+ "leal (%%eax, %%eax, 2), %%ebx \n\t"
+ "addl %%ebx, %%ebx \n\t"
+ ".balign 16 \n\t"
+ "1: \n\t"
+ PREFETCH" 64(%0, %%ebx) \n\t"
+ PREFETCH" 64(%1, %%ebx) \n\t"
+#if defined (HAVE_MMX2) || defined (HAVE_3DNOW)
+ "movq (%0, %%ebx), %%mm0 \n\t"
+ "movq (%1, %%ebx), %%mm1 \n\t"
+ "movq 6(%0, %%ebx), %%mm2 \n\t"
+ "movq 6(%1, %%ebx), %%mm3 \n\t"
+ PAVGB(%%mm1, %%mm0)
+ PAVGB(%%mm3, %%mm2)
+ "movq %%mm0, %%mm1 \n\t"
+ "movq %%mm2, %%mm3 \n\t"
+ "psrlq $24, %%mm0 \n\t"
+ "psrlq $24, %%mm2 \n\t"
+ PAVGB(%%mm1, %%mm0)
+ PAVGB(%%mm3, %%mm2)
+ "punpcklbw %%mm7, %%mm0 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+#else
+ "movd (%0, %%ebx), %%mm0 \n\t"
+ "movd (%1, %%ebx), %%mm1 \n\t"
+ "movd 3(%0, %%ebx), %%mm2 \n\t"
+ "movd 3(%1, %%ebx), %%mm3 \n\t"
+ "punpcklbw %%mm7, %%mm0 \n\t"
+ "punpcklbw %%mm7, %%mm1 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+ "punpcklbw %%mm7, %%mm3 \n\t"
+ "paddw %%mm1, %%mm0 \n\t"
+ "paddw %%mm3, %%mm2 \n\t"
+ "paddw %%mm2, %%mm0 \n\t"
+ "movd 6(%0, %%ebx), %%mm4 \n\t"
+ "movd 6(%1, %%ebx), %%mm1 \n\t"
+ "movd 9(%0, %%ebx), %%mm2 \n\t"
+ "movd 9(%1, %%ebx), %%mm3 \n\t"
+ "punpcklbw %%mm7, %%mm4 \n\t"
+ "punpcklbw %%mm7, %%mm1 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+ "punpcklbw %%mm7, %%mm3 \n\t"
+ "paddw %%mm1, %%mm4 \n\t"
+ "paddw %%mm3, %%mm2 \n\t"
+ "paddw %%mm4, %%mm2 \n\t"
+ "psrlw $2, %%mm0 \n\t"
+ "psrlw $2, %%mm2 \n\t"
+#endif
+ "movq "MANGLE(bgr2VCoeff)", %%mm1 \n\t"
+ "movq "MANGLE(bgr2VCoeff)", %%mm3 \n\t"
+
+ "pmaddwd %%mm0, %%mm1 \n\t"
+ "pmaddwd %%mm2, %%mm3 \n\t"
+ "pmaddwd %%mm6, %%mm0 \n\t"
+ "pmaddwd %%mm6, %%mm2 \n\t"
+#ifndef FAST_BGR2YV12
+ "psrad $8, %%mm0 \n\t"
+ "psrad $8, %%mm1 \n\t"
+ "psrad $8, %%mm2 \n\t"
+ "psrad $8, %%mm3 \n\t"
+#endif
+ "packssdw %%mm2, %%mm0 \n\t"
+ "packssdw %%mm3, %%mm1 \n\t"
+ "pmaddwd %%mm5, %%mm0 \n\t"
+ "pmaddwd %%mm5, %%mm1 \n\t"
+ "packssdw %%mm1, %%mm0 \n\t" // V1 V0 U1 U0
+ "psraw $7, %%mm0 \n\t"
+
+#if defined (HAVE_MMX2) || defined (HAVE_3DNOW)
+ "movq 12(%0, %%ebx), %%mm4 \n\t"
+ "movq 12(%1, %%ebx), %%mm1 \n\t"
+ "movq 18(%0, %%ebx), %%mm2 \n\t"
+ "movq 18(%1, %%ebx), %%mm3 \n\t"
+ PAVGB(%%mm1, %%mm4)
+ PAVGB(%%mm3, %%mm2)
+ "movq %%mm4, %%mm1 \n\t"
+ "movq %%mm2, %%mm3 \n\t"
+ "psrlq $24, %%mm4 \n\t"
+ "psrlq $24, %%mm2 \n\t"
+ PAVGB(%%mm1, %%mm4)
+ PAVGB(%%mm3, %%mm2)
+ "punpcklbw %%mm7, %%mm4 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+#else
+ "movd 12(%0, %%ebx), %%mm4 \n\t"
+ "movd 12(%1, %%ebx), %%mm1 \n\t"
+ "movd 15(%0, %%ebx), %%mm2 \n\t"
+ "movd 15(%1, %%ebx), %%mm3 \n\t"
+ "punpcklbw %%mm7, %%mm4 \n\t"
+ "punpcklbw %%mm7, %%mm1 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+ "punpcklbw %%mm7, %%mm3 \n\t"
+ "paddw %%mm1, %%mm4 \n\t"
+ "paddw %%mm3, %%mm2 \n\t"
+ "paddw %%mm2, %%mm4 \n\t"
+ "movd 18(%0, %%ebx), %%mm5 \n\t"
+ "movd 18(%1, %%ebx), %%mm1 \n\t"
+ "movd 21(%0, %%ebx), %%mm2 \n\t"
+ "movd 21(%1, %%ebx), %%mm3 \n\t"
+ "punpcklbw %%mm7, %%mm5 \n\t"
+ "punpcklbw %%mm7, %%mm1 \n\t"
+ "punpcklbw %%mm7, %%mm2 \n\t"
+ "punpcklbw %%mm7, %%mm3 \n\t"
+ "paddw %%mm1, %%mm5 \n\t"
+ "paddw %%mm3, %%mm2 \n\t"
+ "paddw %%mm5, %%mm2 \n\t"
+ "movq "MANGLE(w1111)", %%mm5 \n\t"
+ "psrlw $2, %%mm4 \n\t"
+ "psrlw $2, %%mm2 \n\t"
+#endif
+ "movq "MANGLE(bgr2VCoeff)", %%mm1 \n\t"
+ "movq "MANGLE(bgr2VCoeff)", %%mm3 \n\t"
+
+ "pmaddwd %%mm4, %%mm1 \n\t"
+ "pmaddwd %%mm2, %%mm3 \n\t"
+ "pmaddwd %%mm6, %%mm4 \n\t"
+ "pmaddwd %%mm6, %%mm2 \n\t"
+#ifndef FAST_BGR2YV12
+ "psrad $8, %%mm4 \n\t"
+ "psrad $8, %%mm1 \n\t"
+ "psrad $8, %%mm2 \n\t"
+ "psrad $8, %%mm3 \n\t"
+#endif
+ "packssdw %%mm2, %%mm4 \n\t"
+ "packssdw %%mm3, %%mm1 \n\t"
+ "pmaddwd %%mm5, %%mm4 \n\t"
+ "pmaddwd %%mm5, %%mm1 \n\t"
+ "addl $24, %%ebx \n\t"
+ "packssdw %%mm1, %%mm4 \n\t" // V3 V2 U3 U2
+ "psraw $7, %%mm4 \n\t"
+
+ "movq %%mm0, %%mm1 \n\t"
+ "punpckldq %%mm4, %%mm0 \n\t"
+ "punpckhdq %%mm4, %%mm1 \n\t"
+ "packsswb %%mm1, %%mm0 \n\t"
+ "paddb "MANGLE(bgr2UVOffset)", %%mm0 \n\t"
+
+ "movd %%mm0, (%2, %%eax) \n\t"
+ "punpckhdq %%mm0, %%mm0 \n\t"
+ "movd %%mm0, (%3, %%eax) \n\t"
+ "addl $4, %%eax \n\t"
+ " js 1b \n\t"
+ : : "r" (src1+width*6), "r" (src2+width*6), "r" (dstU+width), "r" (dstV+width), "g" (-width)
+ : "%eax", "%ebx"
+ );