xxhash324d

fn xxhash324d(p: vec4u) -> u32 {
    let p2 = 2246822519u; let p3 = 3266489917u;
    let p4 = 668265263u; let p5 = 374761393u;
    var h32 = p.w + p5 + p.x * p3;
    h32 = p4 * ((h32 << 17) | (h32 >> (32 - 17)));
    h32 += p.y * p3;
    h32 = p4 * ((h32 << 17) | (h32 >> (32 - 17)));
    h32 += p.z  * p3;
    h32 = p4 * ((h32 << 17) | (h32 >> (32 - 17)));
    h32 = p2 * (h32^(h32 >> 15));
    h32 = p3 * (h32^(h32 >> 13));
    return h32 ^ (h32 >> 16);
}