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From "Charles Cooper (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-951) Patch: Faster implementation of double org.apache.commons.math3.util.FastMath.copySign(double, double)
Date Thu, 21 Mar 2013 23:51:17 GMT

     [ https://issues.apache.org/jira/browse/MATH-951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Charles Cooper updated MATH-951:
--------------------------------

    Summary: Patch: Faster implementation of double org.apache.commons.math3.util.FastMath.copySign(double,
double)  (was: Patch: Faster implementation of double org.apache.commons.math3.FastMath.copySign(double,
double))
    
> Patch: Faster implementation of double org.apache.commons.math3.util.FastMath.copySign(double,
double)
> ------------------------------------------------------------------------------------------------------
>
>                 Key: MATH-951
>                 URL: https://issues.apache.org/jira/browse/MATH-951
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.2
>         Environment: java version "1.6.0_27"
> OpenJDK Runtime Environment (IcedTea6 1.12.3) (6b27-1.12.3-1)
> OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
> Linux debian 3.2.0-4-amd64 #2 SMP Wed Jan 2 01:41:29 PST 2013 x86_64 GNU/Linux
> Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz
>            Reporter: Charles Cooper
>            Priority: Minor
>              Labels: patch, performance
>             Fix For: 3.2
>
>         Attachments: patch, patch
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> Between 40-50% faster than both current implementation and java.lang.Math.copySign by
my (sloppy) benchmark. Patch attached.

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