From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-405013-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 21850 invoked by alias); 29 Oct 2012 14:39:12 -0000
Received: (qmail 19730 invoked by uid 48); 29 Oct 2012 14:38:28 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/55102] The options -flto and -On do not behave as described in GCC docs
Date: Mon, 29 Oct 2012 14:39:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: lto
X-Bugzilla-Keywords: documentation, lto, missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: Status Last reconfirmed CC Ever Confirmed
Message-ID: <bug-55102-4-E76AkSB9JQ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55102-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55102-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-10/txt/msg02689.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55102

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-10-29
                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-29 14:38:24 UTC ---
Yes, fact is that -O0 disables local optimizations before LTO streaming.
It also disables IPA pass local analysis phase which means that even if
enabling -O3 at WPA / LTRANS stages you will _not_ get IPA transforms
enabled.

Eventually we'd want to enable all IPA analysis phases at all -O levels...