From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Richard Biener via Fortran <fortran@gcc.gnu.org>
Cc: Thomas Koenig <tkoenig@netcologne.de>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [patch, Fortran] Enable -fwrapv for -std=legacy
Date: Fri, 10 Mar 2023 11:47:34 -0800 [thread overview]
Message-ID: <ZAuJVnhXqAZ+2tGr@troutmask.apl.washington.edu> (raw)
In-Reply-To: <5C328B17-0588-45F4-8A39-F468F7E9F326@gmail.com>
On Fri, Mar 10, 2023 at 07:01:29PM +0100, Richard Biener via Fortran wrote:
>
>
> > Am 10.03.2023 um 18:54 schrieb Thomas Koenig via Fortran <fortran@gcc.gnu.org>:
> >
> > Hello world, here's the patch that was discussed.
> >
> > Regression-tested. OK for trunk?
> >
> > Since this appeared only in gcc13, I see no need for a backport.
> > I will also document this in the changes file.
>
> The „problem“ is latent forever, I’m not sure it’s good to
> amend the kitchen-sink std=legacy option with -fwrapv since
> that has quite some negative effects on optimization.
In that case, it would then seem logical to remove whatever
patch was added to -O3 that causes the massive regression with
rnflow.f90 and add it instead to -Ofast. -Ofast at least
hints that is unsafe to use.
--
Steve
next prev parent reply other threads:[~2023-03-10 19:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-10 17:54 Thomas Koenig
2023-03-10 18:01 ` Richard Biener
2023-03-10 19:47 ` Steve Kargl [this message]
2023-03-11 9:06 ` Thomas Koenig
2023-03-10 18:01 ` Jakub Jelinek
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=ZAuJVnhXqAZ+2tGr@troutmask.apl.washington.edu \
--to=sgk@troutmask.apl.washington.edu \
--cc=fortran@gcc.gnu.org \
--cc=gcc-patches@gcc.gnu.org \
--cc=tkoenig@netcologne.de \
/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).