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Michael Borcherds edited comment on MATH740 at 4/6/17 1:27 PM:

Sorry, for
> Also GWT 2.8 supports Math.doubleToLongBits() (probably very slow) but not Math.doubleToRawLongBits()
read.
> Also GWT 2.8 supports Double.doubleToLongBits() (probably very slow) but not Double.doubleToRawLongBits()
Math.powerOfTwoD() is a method from Math.java called from Math.ulp()
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/Math.java
was (Author: murkle):
Sorry, for
> Also GWT 2.8 supports Math.doubleToLongBits() (probably very slow) but not Math.doubleToRawLongBits()
read.
> Also GWT 2.8 supports Double.doubleToLongBits() (probably very slow) but not Double.doubleToRawLongBits()
Math.powerOfTwoD() is a method from Math.java
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/Math.java
> Some "FastMath" functions are slow
> 
>
> Key: MATH740
> URL: https://issues.apache.org/jira/browse/MATH740
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Priority: Minor
> Fix For: 4.0
>
> Attachments: jafamatests.zip
>
>
> From the two benchmarks we currently have in "FastMathTestPerfomance", we have that the
following functions are much slower in "FastMath" than in either "Math" or "StrictMath" (the
performance *loss*, for each of the benchmarks, is given in parentheses):
> * log10 (46%, 36%)
> * log1p (68%, 112%)
> * tan (11%, 61%)
> * atan (26%, 125%)
> * atan2 (44%, 40%)

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