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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3179) OpenBitSet.prevSetBit()
Date Tue, 07 Jun 2011 22:20:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045669#comment-13045669
] 

Uwe Schindler commented on LUCENE-3179:
---------------------------------------

You misunderstood me, i know what intrinsics are. My confusion was related to that:

bq. and on CPUs without intrinsic instructions the implementation handcrafted by Yonik was
actually faster than the one in the standard library

And the so called hand crafted method is identical in src.jar and Yonik's code. So without
intrinsics, the standard library and Yoniks code should be identical in performance, as it
was same code, the last time I looked into it.

> 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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