From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-461220-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 26145 invoked by alias); 4 Sep 2014 14:31:56 -0000
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
Received: (qmail 26121 invoked by uid 48); 4 Sep 2014 14:31:52 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/63169] ivopts rewrite_uses pessimizes debug info
Date: Thu, 04 Sep 2014 14:31:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 5.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields:
Message-ID: <bug-63169-4-bjGdSNYGoI@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-63169-4@http.gcc.gnu.org/bugzilla/>
References: <bug-63169-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-09/txt/msg01054.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63169

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
IVOPTs depends on CSE to remove the effect of building its (sometimes gigantic)
GENERIC expressions figuring out IVs and inserting them multiple times.

Not sure if we even try to optimize the IV chosen to replace debuginfo uses.