[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: standards/83845: [ patch ] add log2() and log2f() support for libm
- To: freebsd-standards_(_at_)_FreeBSD_(_dot_)_org
- Subject: Re: standards/83845: [ patch ] add log2() and log2f() support for libm
- From: Roman Bogorodskiy <bogorodskiy_(_at_)_gmail_(_dot_)_com>
- Date: Sat, 23 Jul 2005 04:50:19 GMT
- Reply-to: Roman Bogorodskiy <bogorodskiy_(_at_)_gmail_(_dot_)_com>
The following reply was made to PR standards/83845; it has been noted by GNATS.
From: Roman Bogorodskiy <bogorodskiy_(_at_)_gmail_(_dot_)_com>
To: "Steven G. Kargl" <kargls_(_at_)_comcast_(_dot_)_net>
Subject: Re: standards/83845: [ patch ] add log2() and log2f() support for libm
Date: Sat, 23 Jul 2005 08:50:13 +0400
Content-Type: text/plain; charset=us-ascii
> See standards/82654.
> I have implementations for several C99 long double math functions,
> and in the process I implemented log2 and logf. I also wrote or
That's really great, since our libmath is a bit outdated and nobody
seems to care about that.
> edited the man pages. IMHO, for log2[fl], we want to use frexp[fl]
> to break x into x =3D f * 2**n where f is in the range [0.5,1). We
> then have log2(x) =3D n + log2(f). We can now either evaluate log2(f)
> as log(f)/log(2) or directly use a polynomial approximation.
That looks reasonable. Actually, I don't care which implementation will
be used, your or mine or some another, I'd just like to have it
implemented. But looking at the batch of open standarts PRs I think we
have no chance to get it committed in the near future. :(
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (FreeBSD)
-----END PGP SIGNATURE-----
freebsd-standards_(_at_)_freebsd_(_dot_)_org mailing list
To unsubscribe, send any mail to "freebsd-standards-unsubscribe_(_at_)_freebsd_(_dot_)_org"
Visit your host, monkey.org