“ArmanriazirustConceptunrolling” Ответ

ArmanriazirustConceptunrolling

// is an optimization that removes the overhead of the loop controlling code and instead generates repetitive code for each iteration of the loop.
let buffer: &mut [i32];
let coefficients: [i64; 12];
let qlp_shift: i16;

for i in 12..buffer.len() {
    let prediction = coefficients.iter()
                                 .zip(&buffer[i - 12..i])
                                 .map(|(&c, &s)| c * s as i64)
                                 .sum::<i64>() >> qlp_shift;
    let delta = buffer[i];
    buffer[i] = prediction as i32 + delta;
}