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https://issues.apache.org/jira/browse/LUCENE-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046169#comment-13046169
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Dawid Weiss commented on LUCENE-3179:
-------------------------------------
You're not providing the required contex -- what exact JVM and what exact
processor did you test on? I've just ran your test on my machine with the
following result:
BitUtil nlz time: 3109 picosec/call, dummy: 20252602524
Long nlz time: 1279 picosec/call, dummy: 48220482200
I'm guessing yours didn't use the intrinsic inline at all (for whatever
reason). My machine is a fairly old Intel I7 860 running 64-Bit server hotspot
1.6.0_24-b07.
> 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, TestBitUtil.java
>
>
> Find a previous set bit in an OpenBitSet.
> Useful for parent testing in nested document query execution LUCENE-2454 .
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