[jira] [Commented] (LUCENE-3179) OpenBitSet.prevSetBit()

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045576#comment-13045576 ] 

Yonik Seeley commented on LUCENE-3179:
--------------------------------------

Hey Paul, did you try this implementation against Long.numberOfLeadingZeros?
The later Oracle Java6 implementations have instrinsified this method, so it might be faster: 
http://bugs.sun.com/view_bug.do?bug_id=6823354

> 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-3197.patch
>
>
> Find a previous set bit in an OpenBitSet.
> Useful for parent testing in nested document query execution LUCENE-2454 .

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