[Bug 237800] pow(3) returns inaccurate results

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Nov 5 22:42:49 UTC 2019


--- Comment #16 from Steve Kargl <kargl at FreeBSD.org> ---
(In reply to me from comment #15)
>> You have a ULP of 0.51122.  That is about as accurate as one might
>> expect.
> I get that there's some variance here, but everything else I've
> tested on gives the precise result. I can loosen the tests to
> check with epsilon, but I thought I'd reach out here first to
> see if it might be changed.

Are you familiar with Goldberg's paper?  If not, you need to
read it.  If you are, then you need to re-read it. A ULP of
0.51122 is precise!

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