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https://issues.apache.org/jira/browse/LUCENE-6040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Elschot updated LUCENE-6040:
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Attachment: LUCENE-6040.patch
This adds two bit select methods to BroadWord.java.
selectWithByteLookup() works like select() but uses a lookup to select a bit
from a byte in its last phase.
selectWithOverflowAndByteLookup() also adds a lookup to determine the byte of
the bit to be selected.
Some very simple benchmarks on my machine (i7-4770, 3.4 GHz) are in the test
code in the testPerf* methods. These show that selectWithByteLookup() takes
about 20% less time than select(), and that selectWithOverflowAndByteLookup()
takes about 33% less time.
> Speedup broadword bit selection
> -------------------------------
>
> Key: LUCENE-6040
> URL: https://issues.apache.org/jira/browse/LUCENE-6040
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/other
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: LUCENE-6040.patch
>
>
> Use table lookup instead of some broadword manipulations
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