rmuir commented on PR #12632: URL: https://github.com/apache/lucene/pull/12632#issuecomment-1762055897
@gf2121 @ChrisHegarty you can see the issue from his assembler output with the failed intel optimization: the current code does 2 x 256-bit vpmull on ymm registers, the proposed simplification (go straight from byte->int) instead uses 1 x 512-bit vpmull on zmm registers. Doesn't explain why its slower (maybe AVX-512 downclocking issue for that cpu?, i have to do some digging), but explains why its different. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
