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From: "jakub 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 10:03:00 -0000 [thread overview]
Message-ID: <bug-45670-4-fZqtLgKoGy@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
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-05 10:03:15 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.
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...
next prev parent reply other threads:[~2010-11-05 10:03 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 [this message]
2010-11-05 10:49 ` jakub at gcc dot gnu.org
2010-11-05 11:17 ` ebotcazou at gcc dot gnu.org
2010-11-05 19:01 ` jakub at gcc dot gnu.org
2010-11-05 19:11 ` jakub at gcc dot gnu.org
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