: [output] "=m"(*dest_pixel)
: [pixel_u] "m"(src_pixel_rowu[u>>16])
, [pixel_l] "m"(src_pixel_rowl[u>>16])
, [fracu] "g"(fracU)
, [fracu] "m"(fracU)
, [fracv] "g"(fracV)
, [fracv] "m"(fracV)
: "mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7");
++dest_pixel;