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https://issues.apache.org/jira/browse/MATH-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123811#comment-13123811
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Sebb commented on MATH-688:
---------------------------
AFAIK, the calculations will be done at compile time.
> "FastMath" contains fractions of constants
> ------------------------------------------
>
> Key: MATH-688
> URL: https://issues.apache.org/jira/browse/MATH-688
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Gilles
> Assignee: Gilles
> Priority: Trivial
> Fix For: 3.0
>
>
> Fractions such as 1.0 / 3.0, 1.0 / 5.0, ... could be replaced with static
> final constants.
> In "asinh", for example, the change can sometimes result in more than halving
> the computation time (when the argument is in the range of values where the
> constants are used).
> In absolute times, the gain is not huge, amounting (on my machine) to
> something like 370 ms for 10 million computations.
> And, of course, the downside will be that these constants will be computed at
> the loading of "FastMath", leading to an additional penalty of about 16
> divisions at initialization... :)
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