jpountz commented on PR #14896:
URL: https://github.com/apache/lucene/pull/14896#issuecomment-3033677309

   Wow, this is a big speedup! I'd like to get opinions on 
`INT_FOR_DOUBLE_SPECIES` from folks who are familiar with the vector API, maybe 
@uschindler or @ChrisHegarty. I know we've had to be careful with the vector 
API at times as playing some tricks may get even slower than scalar code on 
some hardware.
   
   > taskCountPerCat=1
   
   FWIW I like higher values of this parameter better. Otherwise a change may 
look like it's a speedup when in fact it is overfitted for a particular query, 
and other similar queries don't get the same speedup. I usually keep it at 5 
like nightly benchmarks.
   
   Separately I wonder if we should keep accumulating scores in `double`s to 
contain the accuracy loss. We don't do it 100% consistently (e.g. if you mix 
SHOULD and MUST clauses, or if you have duplicate clauses that get rewritten as 
a boosted query) and it complicates optimizations like this one.


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