9prady9 commented on pull request #11674:
URL: https://github.com/apache/arrow/pull/11674#issuecomment-969865738


   > @9prady9 In the benchmark results above, why the performance drop occurs 
for the first pair of `BenchmarkBitmapAndWithPopCount` runs (from 18 to 13 G/s) 
but not for the other runs?
   
   Aligned bitmap ops does have performance drop irrespective of whether we 
compute the validity count inside `AlignedBitmapOp` function or outside it by 
calling `CountSetBits`. When done inside the `AlignedBitmapOp` function, the 
drop is significantly higher.


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