rmuir commented on PR #12311:
URL: https://github.com/apache/lucene/pull/12311#issuecomment-1555915665

   Thanks for re-benchmarking @ChrisHegarty ! It has been a few years and an 
older JDK version since this stuff was developed. I had in mind to do a couple 
more runs eventually:
   * try it on aarch64 mac, i think it has no SVE but at least has NEON. at 
least make sure perf isn't horrible or something.
   * see if the manual loop unrolling is still necessary. it is a bit 
ugly/surprising we have to do this for performance.
   
   it is great you have AVX-512, I don't have it. I was worried about using 
`SPECIES_PREFERRED` and clock throttling, but I think lucene doesn't need to do 
anything about this? A user can pass `UseAVX=2` to the JVM if they want to 
avoid AVX-512 for that reason... i think


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