From: Alejandro Colomar <alx@kernel.org>
To: Morten Welinder <mwelinder@gmail.com>
Cc: linux-man@vger.kernel.org, libc-alpha@sourceware.org,
jsm-csl@polyomino.org.uk, newbie-02@gmx.de
Subject: Re: Man page issues: logb, significand, cbrt, log2, log10, exp10
Date: Sun, 3 Mar 2024 03:21:26 +0100 [thread overview]
Message-ID: <ZePerBa3QAvoFVSR@debian> (raw)
In-Reply-To: <CANv4PNm0xvB-GVb+z1yXPRVfeZYHU9533+VRTQfysjaycSbHBw@mail.gmail.com>
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Hi Morten,
On Sat, Mar 02, 2024 at 09:02:24PM -0500, Morten Welinder wrote:
> Thanks.
>
> There is (was?) already crlibm out there.
> https://core-math.gitlabpages.inria.fr/ No particular need for wheel
> reinvention here.
crlibm doesn't seem to exist anymore. Maybe just add some headers to
core-math, and package it as a standalone library.
> FWIW, it appears that the author of the glibc exp10 implementation
> agrees with me that the implementation is sub-standard:
>
> https://codebrowser.dev/glibc/glibc/math/e_exp10.c.html
>
> /* This is a very stupid and inprecise implementation. It'll get
> replaced sometime (soon?). */
> return __ieee754_exp (M_LN10 * arg);
Hmmm. Still, it's simple. If pow(10, x) is strictly better, maybe one
can prove it and send a patch. Or for something better, it'll take more
work.
Have a lovely night!
Alex
--
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.
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next prev parent reply other threads:[~2024-03-03 2:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-01 0:28 Man page issues: logb, significand, cbrt, log2, log10, exp10 Morten Welinder
2024-03-01 0:53 ` Alejandro Colomar
2024-03-02 21:17 ` Morten Welinder
2024-03-02 21:54 ` Alejandro Colomar
2024-03-03 2:02 ` Morten Welinder
2024-03-03 2:21 ` Alejandro Colomar [this message]
2024-03-03 11:46 ` Vincent Lefevre
2024-03-03 12:21 ` Alejandro Colomar
2024-03-03 22:26 ` Morten Welinder
2024-03-04 12:17 ` Adhemerval Zanella Netto
2024-03-04 17:52 ` logb() vs floor(log2()) (was: Man page issues: logb, significand, cbrt, log2, log10, exp10) Alejandro Colomar
2024-03-04 18:47 ` logb() vs floor(log2()) Adhemerval Zanella Netto
2024-03-04 22:16 ` Alejandro Colomar
2024-03-04 23:23 ` logb() vs floor(log2()) (was: Man page issues: logb, significand, cbrt, log2, log10, exp10) Alejandro Colomar
2024-03-05 0:46 ` Man page issues: logb, significand, cbrt, log2, log10, exp10 Alejandro Colomar
2024-03-05 1:05 ` Alejandro Colomar
2024-03-05 1:18 ` Alejandro Colomar
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