From: Szabolcs Nagy <nsz@port70.net>
To: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Cc: musl@lists.openwall.com
Subject: Re: [musl] musl 1.2.4
Date: Thu, 17 Aug 2023 17:57:12 +0200 [thread overview]
Message-ID: <20230817155712.GD3448312@port70.net> (raw)
In-Reply-To: <p9u0bkf73vc2.fsf@coriandre.loria.fr>
* Paul Zimmermann <Paul.Zimmermann@inria.fr> [2023-08-16 16:39:25 +0200]:
> while updating our comparison of mathematical functions with Musl 1.2.4,
> I noticed the following two issues with acoshl and exp10l in double extended
> precision:
>
> zimmerma@coriandre:~/svn/tbd/20/src/binary80$ VERBOSE=-v ./doit.musl acosh 1000
> Checking acosh with musl-1.2.4
> Using seed 2804715
> Using 6 threads
> NEW acosh 0 -1 -0x6.e2368c0ed74e5698p+16l [-nan] [inf] inf inf
> libm gives -0x4.b4d6a621e8e631f8p+0l
> mpfr gives nanl
yes it seems acoshl(x) does not handle x<0
(and can go wrong for x in [-2,-0x1p32])
>
> zimmerma@coriandre:~/svn/tbd/20/src/binary80$ VERBOSE=-v ./doit.musl exp10 1000
> Checking exp10 with musl-1.2.4
> Using seed 2807610
> Using 6 threads
> exp10 0 -1 0x2.68826a13ef3fde64p+16376l [-nan] [inf] inf inf
> libm gives nanl
> mpfr gives infl
this seems to be a bug in powl: the reducl function can overflow.
thanks for the reports.
next prev parent reply other threads:[~2023-08-17 15:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-16 14:39 Paul Zimmermann
2023-08-17 15:57 ` Szabolcs Nagy [this message]
2023-08-18 21:16 ` [musl] [PATCH 1/2] math: fix ld80 acoshl(x) for x < 0 Szabolcs Nagy
2023-08-19 6:10 ` [musl] " Paul Zimmermann
2023-08-18 21:17 ` [musl] [PATCH 2/2] math: fix ld80 powl(x,huge) and powl(LDBL_MAX,small) Szabolcs Nagy
2023-08-19 6:14 ` [musl] " Paul Zimmermann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230817155712.GD3448312@port70.net \
--to=nsz@port70.net \
--cc=Paul.Zimmermann@inria.fr \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).