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From: Morten Welinder <mwelinder@gmail.com>
To: Alejandro Colomar <alx@kernel.org>
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: Sat, 2 Mar 2024 21:02:24 -0500	[thread overview]
Message-ID: <CANv4PNm0xvB-GVb+z1yXPRVfeZYHU9533+VRTQfysjaycSbHBw@mail.gmail.com> (raw)
In-Reply-To: <ZeOgFPCtzqY90kIR@debian>

Thanks.

There is (was?) already crlibm out there.
https://core-math.gitlabpages.inria.fr/  No particular need for wheel
reinvention here.

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);


Compare with musl:

https://github.com/rofl0r/musl/blob/master/src/math/exp10.c

  reply	other threads:[~2024-03-03  2:02 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CANv4PNkVv_0eLgiSP3L_KfC-eZJaVLZ5AP1AGfD0GNrR5M4Hrg@mail.gmail.com>
     [not found] ` <ZeEnJB96mMC5bfBz@debian>
     [not found]   ` <CANv4PNmMpiwfv5acr7U6VEVe7PE_AMTzkkpNoNN9jrtVzk_93Q@mail.gmail.com>
2024-03-02 21:54     ` Alejandro Colomar
2024-03-03  2:02       ` Morten Welinder [this message]
2024-03-03  2:21         ` Alejandro Colomar
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
2024-03-05 16:12 ` [PATCH v2 0/3] manual/math.texi: logb(3) and cbrt(3) fixes Alejandro Colomar
2024-03-05 16:12   ` [PATCH v2 1/3] manual: logb(x) is floor(log2(fabs(x))) Alejandro Colomar
2024-03-29 22:08     ` DJ Delorie
2024-03-29 23:00       ` Alejandro Colomar
2024-03-05 16:12   ` [PATCH v2 2/3] manual: floor(log2(fabs(x))) has rounding errors Alejandro Colomar
2024-03-30  0:24     ` DJ Delorie
2024-03-30  9:27       ` Alejandro Colomar
2024-03-30  9:30         ` Alejandro Colomar
2024-03-30  9:47       ` Andreas Schwab
2024-03-05 16:12   ` [PATCH v2 3/3] manual: Cube roots are rarely representable Alejandro Colomar
2024-03-30  0:27     ` DJ Delorie
2024-03-30  7:07       ` Paul Zimmermann
2024-03-30 16:51         ` DJ Delorie
2024-03-30 18:42           ` Alejandro Colomar
2024-03-30 18:50             ` DJ Delorie
2024-03-30 19:07               ` Alejandro Colomar
2024-03-31 20:38   ` [PATCH v3 0/4] manual: arith.texi and math.texi fixes Alejandro Colomar
2024-03-31 20:38     ` [PATCH v3 1/4] manual: logb(x) is floor(log2(fabs(x))) Alejandro Colomar
2024-03-31 20:38     ` [PATCH v3 2/4] manual: floor(log2(fabs(x))) has rounding errors Alejandro Colomar
2024-03-31 20:38     ` [PATCH v3 3/4] manual: Clarify return value of cbrt(3) Alejandro Colomar
2024-04-01 18:57       ` DJ Delorie
2024-03-31 20:38     ` [PATCH v3 4/4] manual: significand() uses FLT_RADIX, not 2 Alejandro Colomar
2024-04-01 19:09       ` DJ Delorie
2024-03-04 15:29 Man page issues: logb, significand, cbrt, log2, log10, exp10 Wilco Dijkstra
2024-03-05  8:14 ` Paul Zimmermann

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