Date: Fri, 13 Jul 2012 13:07:59 -0400 From: John Baldwin <jhb@freebsd.org> To: David Schultz <das@freebsd.org> Cc: Diane Bruce <db@db.net>, David Chisnall <theraven@freebsd.org>, freebsd-current@freebsd.org, Steve Kargl <sgk@troutmask.apl.washington.edu>, Peter Jeremy <peter@rulingia.com>, Warner Losh <imp@bsdimp.com> Subject: Re: Use of C99 extra long double math functions after r236148 Message-ID: <201207131307.59537.jhb@freebsd.org> In-Reply-To: <20120713155805.GC81965@zim.MIT.EDU> References: <20120529045612.GB4445@server.rulingia.com> <C527B388-3537-406F-BA6D-2FA45B9EAA3B@FreeBSD.org> <20120713155805.GC81965@zim.MIT.EDU>
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On Friday, July 13, 2012 11:58:05 am David Schultz wrote: > On Fri, Jul 13, 2012, David Chisnall wrote: > > As do I. I'd also point out that the ONLY requirement for long > > double according to the standard is that it has at least the same > > precision as double. Therefore, any implementation of these > > functions that is no worse that the double version is compliant. > > Once we have something meeting a minimum standard, then I'm very > > happy to see it improved, but having C99 functions missing now is > > just embarrassing while we're working on adding C11 features. > > There are several things wrong with this reasoning, but pragmatically > the conclusion may be right: we do have a long list of users who would > prefer a dubious implementation to none at all. > > I propose we set a timeframe for this, on the order of a few months. > A rough outline might be something like: > > mid-August: expl logl log2l log10l > -- just need to clean up Bruce and Steve's work; Steve recently > sent me patches for expl, which I hope get committed soon > mid-September: acoshl asinhl atanhl coshl sinhl tanhl > -- easy once expl is in; others could probably help > mid-October: powl expm1l > mid-November: most complex.h functions > > If the schedule can't be met, then we can just import Cephes as an > interim solution without further ado. This provides Bruce and Steve > an opportunity to commit what they have been working on, without > forcing the rest of the FreeBSD community to wait indefinitely for > the pie in the sky. > > By the way, the trig and complex functions are areas where anyone with > some calculus background could contribute. If anyone is interested in > helping out, I'd be happy to coordinate things and review patches, > although I will be unavailable for much of August. I think this sounds like an excellent plan, thanks! -- John Baldwin
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