From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-411539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 7241 invoked by alias); 8 Jan 2013 15:17:38 -0000
Received: (qmail 7094 invoked by uid 48); 8 Jan 2013 15:16:54 -0000
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/48181] [4.6/4.7/4.8 Regression] wrong code with -O -fgcse --param ira-max-conflict-table-size=0
Date: Tue, 08 Jan 2013 15:17:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.6.4
X-Bugzilla-Changed-Fields:
Message-ID: <bug-48181-4-QCuhmCvUjs@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-48181-4@http.gcc.gnu.org/bugzilla/>
References: <bug-48181-4@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: 2013-01/txt/msg00658.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48181

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-08 15:16:52 UTC ---
But then, won't the exact same issues potentially happen in very large
functions where ira_conflicts_p isn't also true, because the conflict table
would be too big?  I'd say zero MB conflict table is reasonable parameter
value, it says don't use the conflict table.  If table larger than the param
would be needed, no table is created at all.