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Posted to issues@lucene.apache.org by "Markus Jelsma (Jira)" <ji...@apache.org> on 2021/02/02 13:28:00 UTC
[jira] [Commented] (LUCENE-9636) Exact and operation to get a SIMD
optimize
[ https://issues.apache.org/jira/browse/LUCENE-9636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277119#comment-17277119 ]
Markus Jelsma commented on LUCENE-9636:
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* [LUCENE-9636|http://issues.apache.org/jira/browse/LUCENE-9636]: Faster decoding of postings for some numbers of bits per value.
(Guo Feng via Adrien Grand)
According to the CHANGES, this ticket should be marked as resolved is it not?
> Exact and operation to get a SIMD optimize
> ------------------------------------------
>
> Key: LUCENE-9636
> URL: https://issues.apache.org/jira/browse/LUCENE-9636
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Feng Guo
> Priority: Trivial
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In decode6(), decode7(), decode14(), decode15(), decode24() longs always `&` a same mask and do some shift. By printing assemble language, i find that JIT did not optimize them with SIMD instructions. But when we extract all `&` operations and do them first, JIT will use SIMD optimize on them.
>
>
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