fn row_transform(src: &[i16], dst: &mut [i32]) {
for i in 0..4 {
let z0 = 13 * ((src[i + 4*0] as i32) + (src[i + 4*2] as i32));
fn row_transform(src: &[i16], dst: &mut [i32]) {
for i in 0..4 {
let z0 = 13 * ((src[i + 4*0] as i32) + (src[i + 4*2] as i32));