private static long XXH64_avalanche(long h64) {
    h64 ^= h64 >>> 33;
    h64 *= XXH_PRIME64_2;
    h64 ^= h64 >>> 29;
    h64 *= XXH_PRIME64_3;
    return h64 ^ (h64 >>> 32);
  }
private static long XXH64_avalanche(long h64)