[GitHub] [lucene] gf2121 commented on pull request #12006: Do int compare instead of ArrayUtil#compareUnsigned4 in LatlonPointQueries

[GitBox <gi...@apache.org>]

gf2121 commented on PR #12006:
URL: https://github.com/apache/lucene/pull/12006#issuecomment-1345297296

   Thanks @rmuir for feedback! This is the current implementation of `ArrayUtil#compareUnsigned4`:
   
   ```
   public static int compareUnsigned4(byte[] a, int aOffset, byte[] b, int bOffset) {
     return Integer.compareUnsigned(
         (int) BitUtil.VH_BE_INT.get(a, aOffset), (int) BitUtil.VH_BE_INT.get(b, bOffset));
   }
   ```
   
   I think it's equivalent to
   ```
   public static int compareUnsigned4(byte[] a, int aOffset, byte[] b, int bOffset) {
     return Integer.compare(NumericUtils.sortableBytesToInt(a, aOffset), NumericUtils.sortableBytesToInt(b, bOffset));
   }
   ```
   
   Because they are both doing a varhandle get and compare unsigned. The point of this PR is to avoid the decoding of one side as the query values are consistent during the intersect. 
   
   I'll do some JMH benchmark to confirm if there is any speed up.


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