Date: Mon, 25 Sep 2023 11:42:51 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Dimitry Andric <dim@freebsd.org> Cc: Paul Zimmermann <Paul.Zimmermann@inria.fr>, freebsd-hackers@freebsd.org Subject: Re: Accuracy of Mathematical Functions Message-ID: <ZRHUq7sPzrC-Eo0P@troutmask.apl.washington.edu> In-Reply-To: <EFAAD1BB-3897-4DDF-B5A6-F6399EA53F17@FreeBSD.org> References: <p9u0h6ni1hwy.fsf@coriandre.loria.fr> <EFAAD1BB-3897-4DDF-B5A6-F6399EA53F17@FreeBSD.org>
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On Mon, Sep 25, 2023 at 08:20:25PM +0200, Dimitry Andric wrote: > On 25 Sep 2023, at 15:50, Paul Zimmermann <Paul.Zimmermann@inria.fr> wrote: > > > > I hope this is not off-topic for this list (Technical discussions relating > > to FreeBSD). > > The freebsd-numerics@ list might have been a better match, but it > receives very low traffic, and the audience on this list will be larger. I suggested Paul post here as numerics@ has had 32 post since 2021 and many of those are due to someone assigning a bug report to numerics. > > We have updated our comparison: > > > > https://members.loria.fr/PZimmermann/papers/accuracy.pdf > > > > This new update includes for the first time the FreeBSD math library, > > whose accuracy is quite good, except: > > > > * single precision: the Bessel functions, lgammaf, cospif, sinpif, tanpif, powf > > * double precision: the Bessel functions, lgammaf, tgammaf, cospi, sinpi, >> tanpi, pow lgammaf and tgammaf are single precision, but it is certainly possible that there are issues. I'll take a look when I have time. >> * double-extended precision: erfcl, lgammal, tgammal, cospil, sinpil, tanpil, >> powl >> >> Some issues have already been fixed in the development version by Steve >> Kargl (we used FreeBSD 13.2). > > Very interesting paper! Of course we are always interested in > improvements for libm, and Steve semi-regularly posts patches in our bug > tracker. (Steve's no longer a committer, but usually these get committed > by others quickly enough.) The issues with half-cycle trig function (i.e., cospi and friends) should be fixed with git 2d3b0a687 on the main branch. It looks like kib merged the patch into stable/13 with git 6fe5d4d8. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272742 -- Steve
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