[LUCENE-467] Use Float.floatToRawIntBits over Float.floatToIntBits

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.9
• Component/s: core/other
• Assignee: Yonik Seeley
• Reporter: Yonik Seeley
• Created: 17/Nov/05 07:16
• Updated: 15/Sep/24 22:24
• Resolved: 27/Nov/05 03:25

Description

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.