code: void regularIncrement(long e) {
      int hash = spread(Long.hashCode(e));
      int start = (hash & 3) << 2;
  
      // Loop unrolling improves throughput by 5m ops/s
      int index0 = indexOf(hash, 0);
      int index1 = indexOf(hash, 1);
      int index2 = indexOf(hash, 2);
      int index3 = indexOf(hash, 3);
  
      boolean added = incrementAt(index0, start, step);
      added |= incrementAt(index1, start + 1, step);
      added |= incrementAt(index2, start + 2, step);
      added |= incrementAt(index3, start + 3, step);
  
      tryReset(added);
    }
docs: Increments all of the associated counters.