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https://issues.apache.org/jira/browse/LUCENE-2232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828218#action_12828218
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Yonik Seeley commented on LUCENE-2232:
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bq. Has it been tried to unroll getVInt()? Unrolling getVInt into 5 explicit
getByte()'s has the advantage that the later conditional jumps are easier to
predict.
IIRC, there was a JIRA issue in the past that tried this. It showed a speedup
in micro-benchmarks but a slowdown when it was actually used in lucene for
something like termdocs.
> Use VShort to encode positions
> ------------------------------
>
> Key: LUCENE-2232
> URL: https://issues.apache.org/jira/browse/LUCENE-2232
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Paul Elschot
> Attachments: LUCENE-2232-nonbackwards.patch,
> LUCENE-2232-nonbackwards.patch
>
>
> Improve decoding speed for typical case of two bytes for a delta position at
> the cost of increasing the size of the proximity file.
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