Alternative using mmx
n Iu8vec8 *v1,*v2,*v3;
nint i,j,k;
nfor(i=0;i<31;i++){
n *v3=(*v1++)+(*v2++);
n v3++;
n }
n _mm_empty();
Type represents 8 by
8bit integers
Arithmetic
on 8 bytes at a time
Indicates MMX regs are now free
