[jira] [Commented] (MATH-740) Some "FastMath" functions are slow

["Michael Borcherds (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955063#comment-15955063 ] 

Michael Borcherds commented on MATH-740:
----------------------------------------

I've run the official tests on FastMath on GWT + Core i7 in Chrome so my patch deletes almost all of FastMath and uses Math instead
A lot slower:
abs 20
acos 14
atan2 21
cbrt 11
pow 12
asin 2.4
log 10
log10 12
log1p 13
hypot 20
expm1 2.0
No significant difference:
atan 1.2
cos 1.5
cosh 0.95
sin 1.4
sinh 0.84
tan 1.5
tanh 1.0
faster:
exp 0.64
sqrt 0.76

See MATH-1406 for more GWT discussion

> Some "FastMath" functions are slow
> ----------------------------------
>
>                 Key: MATH-740
>                 URL: https://issues.apache.org/jira/browse/MATH-740
>             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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