JDK 9 RFR of 4477961: java.lang.Math.toDegrees(double) could be optimized

Brian Burkhalter brian.burkhalter at oracle.com
Mon Sep 22 21:41:18 UTC 2014

Indeed these considerations made me a little nervous about the change. For the edge cases which would have previously overflowed or underflowed this does not seem like a problem, i.e., to obtain a valid result where one would not have done before. For the cases in between however I suppose that there will be some numerical inconsistencies between the two versions.


On Sep 22, 2014, at 2:24 PM, Mike Duigou <mike.duigou at oracle.com> wrote:

> Looks fine.
> I think it is always important note when a change may result in different results for some inputs. I will reiterate for the record what's mentioned in the bug:
>> However, one caveat is that this may affect the results of some calculations.
>> For example, some range of numbers that used to overflow to infinity by
>> performing the multiplication by 180, will now not overflow and will return a
>> valid result.
> This also applies to very small quantities in toRadians where dividing by 180 may have previously resulted in a zero.

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