public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/45670] [4.6 Regression] Less efficient x86 addressing mode selection on 4.6, causes -Os size regression from 4.5
Date: Fri, 05 Nov 2010 11:17:00 -0000	[thread overview]
Message-ID: <bug-45670-4-0Se3V2ik1M@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-45670-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45670

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2010-11-05 11:17:11 UTC ---
> Well, it is actually very much related to that reversion.  While it didn't
> regress in between 161907 and 162617, it regressed from the MEM_REF merge till
> 161906 and from 162618 onwards.

Yes, that isn't different from what I said, it had been caused by something
else.

> The problem is that due to the MEM load combiner isn't able to fix this up, so
> if we don't get it right during expansion, we are out of luck.  Looking at it
> now...

Thanks!


  parent reply	other threads:[~2010-11-05 11:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-45670-4@http.gcc.gnu.org/bugzilla/>
2010-09-29 18:19 ` rguenth at gcc dot gnu.org
2010-11-05 10:03 ` jakub at gcc dot gnu.org
2010-11-05 10:49 ` jakub at gcc dot gnu.org
2010-11-05 11:17 ` ebotcazou at gcc dot gnu.org [this message]
2010-11-05 19:01 ` jakub at gcc dot gnu.org
2010-11-05 19:11 ` jakub at gcc dot gnu.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=bug-45670-4-0Se3V2ik1M@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).