public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103226] [12 Regression] Recent change to copy-headers causes execution failure for gcc.dg/torture/pr80974
Date: Thu, 02 Dec 2021 14:55:55 +0000 [thread overview]
Message-ID: <bug-103226-4-z8eGbt8ANQ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103226-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103226
Hans-Peter Nilsson <hp at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hp at gcc dot gnu.org
--- Comment #24 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #20)
> Your c#19 was a bit hard to follow. But you hit the key issue. Namely that
> the doloop pattern will set/clobber the condition codes if it gets split.
> Failure to show that clobber means that IRA/LRA have incorrect dataflow and
> make incorrect decisions.
>
> I'm testing the obvious fix of adding the clobber. It may be possible to
> improve on my patch, but I'll leave that to someone who really cares about
> the port.
I'm chalking one up for the CC representation ("decc0ration method") where CC
clobbers are *always* present, not added midway "when splitting patterns after
reload". (The SomeoneCaringForBfin would then also find that that the .md file
shrinks.)
prev parent reply other threads:[~2021-12-02 14:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-13 20:39 [Bug tree-optimization/103226] New: " law at gcc dot gnu.org
2021-11-14 10:59 ` [Bug tree-optimization/103226] " aldyh at gcc dot gnu.org
2021-11-15 9:03 ` rguenth at gcc dot gnu.org
2021-11-16 2:30 ` law at gcc dot gnu.org
2021-11-17 11:14 ` aldyh at gcc dot gnu.org
2021-11-17 11:32 ` aldyh at gcc dot gnu.org
2021-11-17 15:00 ` tnfchris at gcc dot gnu.org
2021-11-17 15:02 ` tnfchris at gcc dot gnu.org
2021-11-17 15:53 ` aldyh at gcc dot gnu.org
2021-11-17 16:09 ` tnfchris at gcc dot gnu.org
2021-11-17 16:28 ` law at gcc dot gnu.org
2021-11-17 16:29 ` law at gcc dot gnu.org
2021-11-17 16:31 ` aldyh at gcc dot gnu.org
2021-11-17 17:18 ` aldyh at gcc dot gnu.org
2021-11-17 17:54 ` tnfchris at gcc dot gnu.org
2021-11-17 18:31 ` law at gcc dot gnu.org
2021-11-17 18:43 ` aldyh at gcc dot gnu.org
2021-11-17 19:26 ` aldyh at gcc dot gnu.org
2021-11-17 20:02 ` aldyh at gcc dot gnu.org
2021-11-18 13:28 ` aldyh at gcc dot gnu.org
2021-11-20 7:10 ` law at gcc dot gnu.org
2021-11-20 7:23 ` aldyh at gcc dot gnu.org
2021-11-20 16:30 ` cvs-commit at gcc dot gnu.org
2021-11-20 16:31 ` law at gcc dot gnu.org
2021-12-02 14:55 ` hp at gcc dot gnu.org [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=bug-103226-4-z8eGbt8ANQ@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/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).