Alternative using mmx
Type represents 8 by 8bit integers
n  Iu8vec8 *v1,*v2,*v3;
n int i,j,k;
n for(i=0;i<31;i++){
n        *v3=(*v1++)+(*v2++);
n        v3++;
n    }
n    _mm_empty();
Indicates MMX regs are now free