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https://issues.apache.org/jira/browse/LUCENE-2232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828633#action_12828633
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Yonik Seeley commented on LUCENE-2232:
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A branch mispredict can be more costly, depending on the context.
Cache misses are a major factor, and allowing speculative execution further
ahead in the code (by correctly predicting branches) one can overlap those
cache misses.
http://www.infoq.com/presentations/click-crash-course-modern-hardware
The complexity of modern hardware increases the need to do performance tests in
context (unless it's clearly a win of course).
> 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
> Priority: Minor
> 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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