rmuir commented on issue #12639:
URL: https://github.com/apache/lucene/issues/12639#issuecomment-1755455998

   @jpountz on aarch64 (128-bit simd) the difference is small:
   ```
   Benchmark                      (size)   Mode  Cnt    Score   Error   Units
   BitCountBenchmark.bitCountNew      32  thrpt    5  108.510 ± 1.651  ops/us
   BitCountBenchmark.bitCountOld      32  thrpt    5   93.721 ± 0.300  ops/us
   ```
   
   on avx-256 intel the situation is similar:
   ```
   Benchmark                      (size)   Mode  Cnt   Score   Error   Units
   BitCountBenchmark.bitCountNew      32  thrpt    5  45.930 ± 1.128  ops/us
   BitCountBenchmark.bitCountOld      32  thrpt    5  38.571 ± 0.429  ops/us
   ```


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