[geos-devel] double double

Martin Davis mtnclimb at gmail.com
Fri Dec 7 16:18:42 PST 2018

And for bonus points implement a class (template? macro?) that will choose
DoubleDouble or long double depending on platform...  :)

On Fri, Dec 7, 2018 at 3:29 PM Paul Ramsey <pramsey at cleverelephant.ca>

> Mats, what ever happened to:
> https://github.com/libgeos/geos/pull/40
> I'm just coming up against some stuff in the JTS commit log that expects
> double double and I see you've done this work already some years ago, but
> it's not committed that I can see. JTS changed over some code to use DD
> exclusively about a year ago, so this is a case where porting has caught up
> to need.
> Were there any substantial problems w/ your PR? If not I'm "just" going to
> try and rebase it and use it as the basis for going ahead.
> (It seems like the state-of-the-art would eventually be to use the "long
> double" type, which has an implementation in GCC, but does not yet have one
> in clang, in hopes that by being close to the metal we'd eventually also
> start to reap performance gains as the silicon adds instructions to improve
> long double calculations. ???)
> P.
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