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https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636660#action_12636660
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Paul Elschot commented on LUCENE-1410:
--------------------------------------
Q: I'm using fixed 6-bit frame size. Can you add bigger bit sizes to your pfor
decompress?
A: It should work for 1<=numFrameBits<=30.
That answer was too short. There is some fallback code (decodeAnyFrame) that
will decompress
for any frame or reference. The patch contains unrolled versions of that for up
to 7 bits iirc.
I'll add higher numbers of bits later, the code is straightforward and it could
actually be generated.
Btw. on my machine the unrolled 9 bit version is actually a bit slower than the
loop, I don't know why,
maybe there are too many buffer references (9) in the loop for the jit to cope
with.
> PFOR implementation
> -------------------
>
> Key: LUCENE-1410
> URL: https://issues.apache.org/jira/browse/LUCENE-1410
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Other
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: LUCENE-1410b.patch, TestPFor2.java
>
> Original Estimate: 21840h
> Remaining Estimate: 21840h
>
> Implementation of Patched Frame of Reference.
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