#[unsafe(no_mangle)]
fn gcd(mut a: usize, mut b: usize) -> usize {
    // To make assembly cleaner, remainder panic has been removed.
    while unsafe { a.checked_rem(b).unwrap_unchecked() } != 0 {
        [a, b] = [b, unsafe { a.checked_rem(b).unwrap_unchecked() }];
    }

    b
}

#[unsafe(no_mangle)]
fn gcd2(mut a: usize, mut b: usize) -> usize {
    while unsafe { a.checked_rem(b).unwrap_unchecked() } != 0 {
        let t = b;
        b = a % b;
        a = t;
    }

    b
}