Accuracy of Mathematical Functions

[Joseph Myers]

On Sat, 12 Feb 2022, Paul Zimmermann wrote:

> > 1. I don't know if any of those libraries include any of the new functions 
> > C23 adds from TS 18661-4 (beyond exp10), but if they do, it might be worth 
> > adding them to the comparison.  (My remarks from 
> > <https://sourceware.org/pipermail/libc-alpha/2022-January/135006.html> 
> > apply regarding adding them to glibc - when I get time I hope to add them, 
> > as with other new C23 features, if no-one else has done them by then.)
> 
> is http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1946.pdf the correct
> reference for the list of these functions? Most of them are available in
> MPFR, when they will be available in glibc we might indeed add them.

I think N2401 was the version used for integration into C23.  I'd advise 
using the current C23 working draft (currently N2731, but hopefully N2912 
will become available soon).

Note that the reduction functions from TS 18661-4 weren't integrated into 
C23 (but would also have been much more awkward to handle in this accuracy 
testing); instead there will be a revision of TS 18661-4 (and -5) based on 
C23 to include those features not integrated.

-- 
Joseph S. Myers
joseph@codesourcery.com