accuracy of asinh and atanh

[David Feuer]

Wasn't there a very recent commit to improve these functions, by leftaroundabout?

On Thursday, August 2, 2018 8:16:10 AM EDT Artem Pelenitsyn wrote:
> Here is the patch: https://phabricator.haskell.org/D5034
> 
> --
> Best, Artem
> 
> On Thu, 2 Aug 2018 at 06:26 Artem Pelenitsyn <a.pelenitsyn at gmail.com> wrote:
> 
> > I'd be willing to do this.
> >
> > --
> > Best wishes,
> > Artem
> >
> >
> > On Thu, 2 Aug 2018, 04:38 Matt Peddie, <mpeddie at gmail.com> wrote:
> >
> >> Thanks, Ben, for chiming in.  I think calling out to C for these
> >> functions is the way to go if it's now feasible.  (Calling out to libm
> >> is the workaround I'm using in the application that led me to discover
> >> the inaccuracy.)
> >>
> >> Matt
> >>
> >> On Thu, Aug 2, 2018 at 11:33 AM, Ben Gamari <ben at smart-cactus.org> wrote:
> >> > Matt Peddie <mpeddie at gmail.com> writes:
> >> >
> >> >> Hi George,
> >> >>
> >> >> Not a stupid question.  I don't have a single source at hand, but I
> >> >> think I read in a few places on the wiki that calling out to the
> >> >> system math library is not an option due to the variety of system math
> >> >> libraries on the platforms GHC supports.  It'd be great if I got the
> >> >> wrong impression and this could just be a call to C.  Can anyone set
> >> >> me straight on this point?
> >> >>
> >> > Indeed it's not a stupid question at all. Indeed this is precisely what
> >> > we do for the simpler transcendentals (e.g. sin, asin, log). We very
> >> > well could move in this direction in the case of asinh/atanh as well. I
> >> > believe the reason we don't currently is that atanh was only
> >> > standardized in C99, which we only started requiring a few releases ago.
> >> > Perhaps this is ultimately the right direction.
> >> >
> >> > Cheers,
> >> >
> >> > - Ben
> >> _______________________________________________
> >> ghc-devs mailing list
> >> ghc-devs at haskell.org
> >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
> >>
> >
> 


-- 
David Feuer
Well-Typed