"FastMath" contains fractions of constants
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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 to something like 5 ms for
10 million computations.
And, of course, the downside will be that these values will be computed at the
loading of "FastMath", leading to an additional penalty of about 16 divisions
at initialization... :)
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