vector unsigned int sad, zero;
vector unsigned int sad;
int pix_abs8x8_altivec(uint8_t *pix1, uint8_t *pix2, int line_size){    int i, s;    vector unsigned char perm1, perm2, permclear, *pix1v, *pix2v;    vector unsigned char t1, t2, t3,t4, t5;    vector unsigned int sad, zero;    vector signed int sumdiffs;    zero = (vector unsigned int) (0);    sad = (vector unsigned int) (0);    permclear = (vector unsigned char) (255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0);    for(i=0;i<8;i++) {	/* Read potentially unaligned pixels into t1 and t2	   Since we're reading 16 pixels, and actually only want 8,	   mask out the last 8 pixels. The 0s don't change the sum. */        perm1 = vec_lvsl(0, pix1);        pix1v = (vector unsigned char *) pix1;        perm2 = vec_lvsl(0, pix2);        pix2v = (vector unsigned char *) pix2;        t1 = vec_and(vec_perm(pix1v[0], pix1v[1], perm1), permclear);        t2 = vec_and(vec_perm(pix2v[0], pix2v[1], perm2), permclear);	/* Calculate a sum of abs differences vector */         t3 = vec_max(t1, t2);        t4 = vec_min(t1, t2);        t5 = vec_sub(t3, t4);	/* Add each 4 pixel group together and put 4 results into sad */        sad = vec_sum4s(t5, sad);        pix1 += line_size;        pix2 += line_size;    }    /* Sum up the four partial sums, and put the result into s */    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);    sumdiffs = vec_splat(sumdiffs, 3);    vec_ste(sumdiffs, 0, &s);    return s;}