accuracy of asinh and atanh

[Artem Pelenitsyn]

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
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>
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