From: Joseph Myers <joseph@codesourcery.com>
To: Szabolcs Nagy <szabolcs.nagy@arm.com>
Cc: Paul E Murphy <murphyp@linux.ibm.com>, <libc-alpha@sourceware.org>
Subject: Re: faster expf128
Date: Mon, 29 Jun 2020 22:39:50 +0000 [thread overview]
Message-ID: <alpine.DEB.2.21.2006292238100.11490@digraph.polyomino.org.uk> (raw)
In-Reply-To: <20200626100915.GN16726@arm.com>
On Fri, 26 Jun 2020, Szabolcs Nagy wrote:
> > There is no expectation that most libm functions (other than those such as
> > fma and sqrt that are fully defined by the corresponding IEEE operations)
> > set inexact correctly. (It is necessary to set other exceptions
> > correctly, and the glibc testsuite verifies that; for expf128, that's
> > invalid (for signaling NaNs), overflow and underflow.)
>
> and presumably target specific exceptions are not considered.
> (e.g. input denormal on x86)
Indeed, there are no expectations that libm functions do anything in
particular with those. (Those <fenv.h> functions that manipulate the
whole environment, such as fegetenv and fesetenv, should still save and
restore such architecture-specific state.)
--
Joseph S. Myers
joseph@codesourcery.com
prev parent reply other threads:[~2020-06-29 22:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 11:02 Paul Zimmermann
2020-06-22 13:59 ` Paul E Murphy
2020-06-22 21:18 ` Joseph Myers
2020-06-24 6:22 ` Paul Zimmermann
2020-06-24 17:39 ` Joseph Myers
2020-06-26 10:09 ` Szabolcs Nagy
2020-06-29 22:39 ` Joseph Myers [this message]
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=alpine.DEB.2.21.2006292238100.11490@digraph.polyomino.org.uk \
--to=joseph@codesourcery.com \
--cc=libc-alpha@sourceware.org \
--cc=murphyp@linux.ibm.com \
--cc=szabolcs.nagy@arm.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.
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 read-only IMAP folder(s) and NNTP newsgroup(s).