"movq 12(%1), %%mm6 \n\t"
"paddd (%1), %%mm2 \n\t"
"paddd 8(%1), %%mm6 \n\t"
- "movq %%mm2, %%mm0 \n\t"
- "movq %%mm6, %%mm4 \n\t"
- "pslld $2, %%mm2 \n\t"
- "pslld $2, %%mm6 \n\t"
+ "pxor %%mm0, %%mm0 \n\t" //note: the 2 xor could be avoided if we would flip the rounding direction
+ "pxor %%mm4, %%mm4 \n\t"
"psubd %%mm2, %%mm0 \n\t"
"psubd %%mm6, %%mm4 \n\t"
"psrad $1, %%mm0 \n\t"
"psrad $1, %%mm4 \n\t"
- "movq (%0), %%mm2 \n\t"
- "movq 8(%0), %%mm6 \n\t"
"psubd %%mm0, %%mm2 \n\t"
"psubd %%mm4, %%mm6 \n\t"
+ "movq (%0), %%mm0 \n\t"
+ "movq 8(%0), %%mm4 \n\t"
+ "paddd %%mm0, %%mm2 \n\t"
+ "paddd %%mm4, %%mm6 \n\t"
"movq %%mm2, (%2) \n\t"
"movq %%mm6, 8(%2) \n\t"
:: "r"(&src[i]), "r"(&b[i]), "r"(&temp[i])