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Message-ID: <20260216000342.GH3520958@port70.net>
Date: Mon, 16 Feb 2026 01:03:42 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Paul Zimmermann <Paul.Zimmermann@...ia.fr>
Cc: musl@...ts.openwall.com
Subject: Re: Accuracy of Mathematical Functions
* Paul Zimmermann <Paul.Zimmermann@...ia.fr> [2026-02-15 09:18:49 +0100]:
> from a GNU libc 2.43 build, which integrates atanh from CORE-MATH:
ah, i missed this.
good work
thanks
> $ ls -l ./math/e_acosh.o
> -rw-r--r-- 1 zimmerma caramba 57696 Jan 29 14:06 ./math/e_acosh.o
you should use 'size' from binutils to see the
actual code size (or size -A to see .text and
.rodata separately), that's what matters at
runtime. writable data should be 0.
i think up to 4k lookup table is acceptable
per function, beyond that one can start to
worry about tiny vs fast tradeoffs.
>
> You can find some timings about the integration of acosh in GNU libc here:
>
> https://sourceware.org/pipermail/libc-alpha/2025-October/170985.html
>
> (there are similar timings for other functions integrated in GNU libc)
>
> > eventually it may be worth considering cr in libc.
>
> Best regards,
> Paul
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