static int pix_sum_altivec(uint8_t *pix, int line_size) { int i, s; const vector unsigned int zero = (const vector unsigned int) vec_splat_u32(0); vector unsigned int sad = (vector unsigned int) vec_splat_u32(0); vector signed int sumdiffs; for (i = 0; i < 16; i++) { /* Read the potentially unaligned 16 pixels into t1. */ //vector unsigned char pixl = vec_ld(0, pix); //vector unsigned char pixr = vec_ld(15, pix); //vector unsigned char t1 = vec_perm(pixl, pixr, perm); vector unsigned char t1 = vec_vsx_ld(0, pix); /* Add each 4 pixel group together and put 4 results into sad. */ sad = vec_sum4s(t1, sad); pix += 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_vsx_st(sumdiffs, 0, &s); return s; }