rmuir commented on PR #12632:
URL: https://github.com/apache/lucene/pull/12632#issuecomment-1772661255

   to have any decent performance, we really need information on the CPU in 
question and its vector capabilities. And the idea you can write "one loop" 
that "runs anywhere" is an obvious pipe dream on the part of openjdk... we have 
to deal with special-case BS like this for every CPU. my advice on openjdk 
side: give up on the pipe dream and give us some cpuinfo or at least tell us 
what vector operations are supported. I'm almost to the point of writing 
/proc/cpuinfo parser.


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