code: boolean checkTag(long bucketIndex, int posInBucket, long tag) {
  		long tagStartIdx = getTagOffset(bucketIndex, posInBucket);
  		final int bityPerTag = bitsPerTag;
  		for (long i = 0; i < bityPerTag; i++) {
  			if (memBlock.get(i + tagStartIdx) != ((tag & (1L << i)) != 0))
  				return false;
  		}
  		return true;
  	}
docs: Check if a tag in a given position in a bucket matches the tag you passed
  it. Faster than regular read because it stops checking if it finds a
  non-matching bit.