public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "hutchinsonandy at aim dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/35542] [4.3 Regression] fwprop only propagates one operand
Date: Wed, 02 Apr 2008 15:45:00 -0000 [thread overview]
Message-ID: <20080402154425.2561.qmail@sourceware.org> (raw)
In-Reply-To: <bug-35542-7746@http.gcc.gnu.org/bugzilla/>
------- Comment #6 from hutchinsonandy at aim dot com 2008-04-02 15:44 -------
Subject: Re: [4.3 Regression] fwprop only propagates
one operand
Eric,
it's difficult to give you a specfic example as the propagation is very
sensitive to generated code. I found this looking at other AVR bugs and
discovered it was not working. (I'll look up that example latter for
you).
It not an obvious thing as other (good) changes due to DF merge,
re-arrange code enough to obscure the omission. But the result is an
extra move or redundant instruction here and there.
(its also not at all specfic to AVR)
Andy
-----Original Message-----
From: eric dot weddington at atmel dot com <gcc-bugzilla@gcc.gnu.org>
To: hutchinsonandy@aim.com
Sent: Wed, 2 Apr 2008 10:21 am
Subject: [Bug rtl-optimization/35542] [4.3 Regression] fwprop only
propagates one operand
------- Comment #4 from eric dot weddington at atmel dot com
2008-04-02 15:21
-------
(In reply to comment #3)
> committed to trunk, will backport to 4.3 in due time (causes
regressions for
> AVR)
>
Could you list what fails?
Thanks!
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35542
------- You are receiving this mail because: -------
You reported the bug, or are watching the reporter.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35542
next prev parent reply other threads:[~2008-04-02 15:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-11 20:32 [Bug rtl-optimization/35542] New: " hutchinsonandy at aim dot com
2008-03-11 20:35 ` [Bug rtl-optimization/35542] " hutchinsonandy at aim dot com
2008-04-02 9:57 ` bonzini at gcc dot gnu dot org
2008-04-02 9:57 ` [Bug rtl-optimization/35542] [4.3 Regression] " bonzini at gnu dot org
2008-04-02 15:22 ` eric dot weddington at atmel dot com
2008-04-02 15:26 ` bonzini at gnu dot org
2008-04-02 15:45 ` hutchinsonandy at aim dot com [this message]
2008-04-29 8:20 ` aoliva at gcc dot gnu dot org
2008-06-11 11:10 ` jsm28 at gcc dot gnu dot org
2008-06-12 10:16 ` jakub at gcc dot gnu dot org
2008-08-01 9:55 ` bonzini at gnu dot org
2008-08-01 9:56 ` bonzini at gcc dot gnu dot org
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=20080402154425.2561.qmail@sourceware.org \
--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).