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  1. Lucene - Core
  2. LUCENE-467

Use Float.floatToRawIntBits over Float.floatToIntBits

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 1.9
    • None
    • core/other
    • None

    Description

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      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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            yseeley@gmail.com Yonik Seeley
            yseeley@gmail.com Yonik Seeley
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              Created:
              Updated:
              Resolved: