int low = firstChild;
    int high = firstChild + numChildren - 1;

    while (low <= high) {
      int mid = (low + high) >>> 1;
      int labelOffset = trieData.charAt(mid * NODE_SIZE);
      int cmp = compareLabel(label, labelOffset);

      if (cmp < 0) {
        high = mid - 1;
      } else if (cmp > 0) {
        low = mid + 1;
      } else {
        return mid;
      }
    }
    return -1;
  }