From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-399574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 28880 invoked by alias); 28 Aug 2012 11:28:30 -0000
Received: (qmail 28869 invoked by uid 22791); 28 Aug 2012 11:28:30 -0000
X-SWARE-Spam-Status: No, hits=-4.3 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 28 Aug 2012 11:28:17 +0000
From: "Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/38474] slow compilation at -O0 due to expand's temp slot goo
Date: Tue, 28 Aug 2012 11:28:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Keywords: compile-time-hog, memory-hog, patch
X-Bugzilla-Severity: normal
X-Bugzilla-Who: Joost.VandeVondele at mat dot ethz.ch
X-Bugzilla-Status: WAITING
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: matz at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-38474-4-mERK65aMFR@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-38474-4@http.gcc.gnu.org/bugzilla/>
References: <bug-38474-4@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: 2012-08/txt/msg01846.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474

--- Comment #70 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-08-28 11:28:06 UTC ---
(In reply to comment #69)
> Is there still a problem here?

for current trunk and the original testcase, timings are reasonable at -O0 -O1
-O2, but very long at -O3 (>60min):

report.O0.txt: TOTAL                 :  38.78             0.89            39.67
            691166 kB
report.O1.txt: TOTAL                 :  70.04             1.13            71.22
            634523 kB
report.O2.txt: TOTAL                 : 204.51             1.16           205.71
            691522 kB

the biggest consumers are

-O0:  
====
integrated RA           :  10.36 
reload                  :   5.16;

-O1:
====
tree PTA                :   7.77
integrated RA           :  13.36

-O2:
====
expand vars             :  83.15
tree PTA                :  35.04

-O3: (also needs about 4Gb of memory)
====
??? not yet finished (>60min)