[
https://issues.apache.org/jira/browse/LUCENE-4690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555746#comment-13555746
]
Yonik Seeley commented on LUCENE-4690:
--------------------------------------
An additional cool little hack... even though it's much improved, IDIV still
has a latency of 18-42 cycles on a core2 processor. One equivalent of i/7 is
(i*37)>>8 for i in 0..63. This only takes 4 cycles.
> remove hashing from NumericUtils.*ToPrefixCoded
> ------------------------------------------------
>
> Key: LUCENE-4690
> URL: https://issues.apache.org/jira/browse/LUCENE-4690
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Yonik Seeley
>
> As far as I can tell nothing actually uses the hash codes generated by these
> methods (not even any tests). If someone did want to generate a hash, it
> would be just as fast to do it on the BytesRef after the fact (or even faster
> from the input number itself).
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
