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https://issues.apache.org/jira/browse/LUCENE-9679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Sokolov resolved LUCENE-9679.
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Resolution: Won't Fix
this was never a great idea, and now we have other patches achieving its stated
aim
> Try using Math.fma to speed up vector computations
> --------------------------------------------------
>
> Key: LUCENE-9679
> URL: https://issues.apache.org/jira/browse/LUCENE-9679
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael Sokolov
> Priority: Major
>
> On the mailing list, Anton Hägerstrand <an...@blunders.io> posted a link to a
> blog post showing hotspots in our indexing:
> https://blunders.io/posts/lucene-bench-2021-01-10 and identified vecto dot
> product computations as one of them. Not surprising in itself, but he also
> suggested we might want to try using {{Math.fma}} in the computation to see
> if it can optimize the multiply-and-add operation that is at the heart of
> both the dot product and l2-norm distance.
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