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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-136) Fused multiply-add in org.apache.sis.referencing.operation
Date Wed, 11 Sep 2013 13:40:52 GMT
Martin Desruisseaux created SIS-136:
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             Summary: Fused multiply-add in org.apache.sis.referencing.operation
                 Key: SIS-136
                 URL: https://issues.apache.org/jira/browse/SIS-136
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Referencing
            Reporter: Martin Desruisseaux
            Priority: Minor


This issue is for tracking the progress on the two following Oracle tasks:

* [JDK-4851642 : Add FMA to Java math library|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4851642]
* [JDK-4919337 : Augment Java math libraries with more methods from C libm and IEEE 754|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4919337]

If _Fused Multiply-Add_ (FMA) are added to the Java language, we should leverage them in coordinate
operations. In some cases (e.g. {{MatrixSIS}} subclasses), the main goal is not performance,
but rather accuracy. Matrix inversions usually have rounding errors, and those rounding errors
may be propagated in every corners of SIS library because of the central role played by matrices
in SIS. While rounding errors can not be completely avoided, reducing them as much as possible
may reduce the risk of surprising behaviour, especially when converting the pixel coordinates
between two _Grid Coverages_.


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