Use Float.floatToRawIntBits over Float.floatToIntBits
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Key: LUCENE-467
URL: http://issues.apache.org/jira/browse/LUCENE-467
Project: Lucene - Java
Type: Improvement
Components: Other
Versions: 1.9
Reporter: Yonik Seeley
Priority: Minor
Copied From my Email:
Float.floatToRawIntBits (in Java1.4) gives the raw float bits without
normalization (like *(int*)&floatvar would in C). Since it doesn't do
normalization of NaN values, it's faster (and hopefully optimized to a
simple inline machine instruction by the JVM).
On my Pentium4, using floatToRawIntBits is over 5 times as fast as
floatToIntBits.
That can really add up in something like Similarity.floatToByte() for
encoding norms, especially if used as a way to compress an array of
float during query time as suggested by Doug.
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