From: Bobby Bingham <koorogi@koorogi.info>
To: musl@lists.openwall.com
Subject: math_errhandling definition
Date: Sun, 17 Nov 2013 15:54:54 -0600 [thread overview]
Message-ID: <20131117215454.GA9505@duality.lan> (raw)
[-- Attachment #1: Type: text/plain, Size: 768 bytes --]
I think the definition of math_errhandling is wrong on a couple
architectures. C99 (7.12) says:
If the expression math_errhandling & MATH_ERREXCEPT can be nonzero,
the implementation shall define the macros FE_DIVBYZERO, FE_INVALID,
and FE_OVERFLOW in <fenv.h>.
math.h always defines math_errhandling as 2 (MATH_ERREXCEPT), but
whether those FE_* macros are defined or not is architecture-dependent.
In particular, ARM only defines them if __ARM_PCS_VFP is defined, and
microblaze does not define them.
It looks like if the architecture doesn't support floating point
exceptions, math_errhandling must be MATH_ERRNO. This in turn requires
that the various math functions set errno appropriately, which it
doesn't look like musl's do.
--
Bobby Bingham
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
next reply other threads:[~2013-11-17 21:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-17 21:54 Bobby Bingham [this message]
2013-11-17 23:13 ` Szabolcs Nagy
2013-11-18 19:59 ` Rich Felker
2013-11-20 5:27 ` Bobby Bingham
2013-11-20 20:50 ` Rich Felker
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=20131117215454.GA9505@duality.lan \
--to=koorogi@koorogi.info \
--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).