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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3179) OpenBitSet.prevSetBit()
Date Tue, 07 Jun 2011 22:30:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045679#comment-13045679
] 

Dawid Weiss commented on LUCENE-3179:
-------------------------------------

Oh, ok -- clear. So, my comment was related to the various methods of doing bitcounts and
other bit-fiddling on arrays of long values (for example pop_array) -- these are HD derived
implementations; I compared them to naive loops using intrinsics and naive loops on cpus (and
jvms) without intrinsics -- in that case simple loops with intrinsics was faster than Lucene's
code, but Lucene's code was faster than simple loops without intrinsics (effectively using
whatever was in the std. library).

> OpenBitSet.prevSetBit()
> -----------------------
>
>                 Key: LUCENE-3179
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3179
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Paul Elschot
>            Priority: Minor
>             Fix For: 3.3
>
>         Attachments: LUCENE-3179.patch
>
>
> Find a previous set bit in an OpenBitSet.
> Useful for parent testing in nested document query execution LUCENE-2454 .

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