foo.rs

use std::num::Wrapping as w;

#[no_mangle]
pub fn foo() {
    let mut a = w::<u64>(0x9e3779b97f4a7c13);
    let mut b = w::<u64>(0x9e3779b97f4a7c13);
    let mut c = w::<u64>(0x9e3779b97f4a7c13);
    let mut d = w::<u64>(0x9e3779b97f4a7c13);
    let mut e = w::<u64>(0x9e3779b97f4a7c13);
    let mut f = w::<u64>(0x9e3779b97f4a7c13);
    let mut g = w::<u64>(0x9e3779b97f4a7c13);
    let mut h = w::<u64>(0x9e3779b97f4a7c13);

    for _ in 0..4 {
        a=a-e; f=f^(h>>9);  h=h+a;
        b=b-f; g=g^(a<<9);  a=a+b;
        c=c-g; h=h^(b>>23); b=b+c;
        d=d-h; a=a^(c<<15); c=c+d;
        e=e-a; b=b^(d>>14); d=d+e;
        f=f-b; c=c^(e<<20); e=e+f;
        g=g-c; d=d^(f>>17); f=f+g;
        h=h-d; e=e^(g<<14); g=g+h;
    }
}