* OpenLibm?
@ 2021-12-01 23:32 Joel Sherrill
0 siblings, 0 replies; 3+ messages in thread
From: Joel Sherrill @ 2021-12-01 23:32 UTC (permalink / raw)
To: Newlib
Hi
I was looking for a possible source of long double libm method
implementations and it looks like openlibm
(https://github.com/JuliaMath/openlibm) has a complete implementation
for multiple architectures of interest. It is based on the fdlibm
source I think most of newlib's libm came from and appears to be well
maintained.
Any thoughts on using this for at least the long double methods?
Other than inertia, is there a reason not to consider newlib just
importing this?
--joel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: OpenLibm?
2021-12-02 8:02 OpenLibm? Paul Zimmermann
@ 2021-12-02 14:30 ` Joel Sherrill
0 siblings, 0 replies; 3+ messages in thread
From: Joel Sherrill @ 2021-12-02 14:30 UTC (permalink / raw)
To: Paul Zimmermann; +Cc: Newlib
On Thu, Dec 2, 2021 at 2:03 AM Paul Zimmermann <Paul.Zimmermann@inria.fr> wrote:
>
> about Joel's mail (https://sourceware.org/pipermail/newlib/2021/018739.html).
>
> OpenLibm long double does not implement exp10, j0, j1, y0 and y1, and has
> accuracy issues with lgamma and tgamma. See Table 11 of
> https://members.loria.fr/PZimmermann/papers/#accuracy.
OK both have issues. I'd like long double support in newlib's libm to
improve standards compliance. I was looking for an implementation.
Issue: newlib has no long double support when sizeof(long double) !=
sizeof(double).
Random thoughts:
+ For the missing openlibm methods, newlib's implementation of those
methods could be submitted to openlibm.
+ Does newlib have an accuracy document?
+ Is newlib's accuracy better than openlibm's?
+ Would it make sense to port long double methods from openlibm to newlib?
I'm just trying to find a technical path to get long double into newlib.
I have no vested interest in any particular path that achieves that.
If we can agree on a technical path, RTEMS could add this as a potential
Google Summer of Code 2022 project.
--joel
> Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
* OpenLibm?
@ 2021-12-02 8:02 Paul Zimmermann
2021-12-02 14:30 ` OpenLibm? Joel Sherrill
0 siblings, 1 reply; 3+ messages in thread
From: Paul Zimmermann @ 2021-12-02 8:02 UTC (permalink / raw)
To: newlib
about Joel's mail (https://sourceware.org/pipermail/newlib/2021/018739.html).
OpenLibm long double does not implement exp10, j0, j1, y0 and y1, and has
accuracy issues with lgamma and tgamma. See Table 11 of
https://members.loria.fr/PZimmermann/papers/#accuracy.
Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
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