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From "Paul Elschot (JIRA)" <>
Subject [jira] Commented: (LUCENE-1410) PFOR implementation
Date Mon, 06 Oct 2008 17:43:44 GMT


Paul Elschot commented on LUCENE-1410:

I can't see the .tgz attachment at the moment.

Very nice table, this java/c++ comparison. Meanwhile I also have a java program generator
for decompression, and I got very similar results.

I found a bug for the 17 bits case in decodeAnyFrame(), this might explain the sum test failure
that you saw.

One detail on the generated code: the final mask can be omitted, for example the last bit
extraction for the 5 bit case:
.bq (i4 >>> 27)
On the java side leaving this last mask out did not make a difference, but it might be noticeable
in c++.

> PFOR implementation
> -------------------
>                 Key: LUCENE-1410
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Other
>            Reporter: Paul Elschot
>            Priority: Minor
>         Attachments: LUCENE-1410b.patch,,,
>   Original Estimate: 21840h
>  Remaining Estimate: 21840h
> Implementation of Patched Frame of Reference.

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