accuracy of asinh and atanh

[Artem Pelenitsyn]

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
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