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Posted to issues@lucene.apache.org by "Greg Miller (Jira)" <ji...@apache.org> on 2021/04/08 20:43:00 UTC
[jira] [Commented] (LUCENE-9918) Can PForUtil be further
auto-vectorized?
[ https://issues.apache.org/jira/browse/LUCENE-9918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317473#comment-17317473 ]
Greg Miller commented on LUCENE-9918:
-------------------------------------
I've setup a microbenchmark project over [here|https://github.com/gsmiller/lucene-pfor-benchmark] to help explore this more easily if anyone is interested. I'll probably mess around with this a bit, but don't let that stop you from working on it if interested :)
> Can PForUtil be further auto-vectorized?
> ----------------------------------------
>
> Key: LUCENE-9918
> URL: https://issues.apache.org/jira/browse/LUCENE-9918
> Project: Lucene - Core
> Issue Type: Task
> Components: core/codecs
> Affects Versions: main (9.0)
> Reporter: Greg Miller
> Priority: Minor
>
> While working on LUCENE-9850, we discovered the loop in PForUtil::prefixSumOf is not getting auto-vectorized by the HotSpot compiler. We tried a few different tweaks to see if we could change this, but came up empty. There are some additional suggestions in the related [PR|https://github.com/apache/lucene/pull/69#discussion_r608412309] that could still be experimented with, and it may be worth doing so to see if further improvements could be squeezed out.
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