From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 15843 invoked by alias); 20 Jul 2011 20:48:50 -0000 Received: (qmail 15829 invoked by uid 22791); 20 Jul 2011 20:48:49 -0000 X-SWARE-Spam-Status: No, hits=-7.1 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,SPF_HELO_PASS,TW_XF X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 20 Jul 2011 20:48:32 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p6KKmPVJ007402 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 20 Jul 2011 16:48:25 -0400 Received: from tyan-ft48-01.lab.bos.redhat.com (tyan-ft48-01.lab.bos.redhat.com [10.16.42.4]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p6KKmOrV003460 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 20 Jul 2011 16:48:25 -0400 Received: from tyan-ft48-01.lab.bos.redhat.com (localhost.localdomain [127.0.0.1]) by tyan-ft48-01.lab.bos.redhat.com (8.14.4/8.14.4) with ESMTP id p6KKmOdT004627; Wed, 20 Jul 2011 22:48:24 +0200 Received: (from jakub@localhost) by tyan-ft48-01.lab.bos.redhat.com (8.14.4/8.14.4/Submit) id p6KKmNoi004625; Wed, 20 Jul 2011 22:48:23 +0200 Date: Wed, 20 Jul 2011 21:04:00 -0000 From: Jakub Jelinek To: Michael Eager Cc: Alexandre Oliva , Bernd Schmidt , gcc-patches@gcc.gnu.org Subject: Re: introduce --param max-vartrack-expr-depth Message-ID: <20110720204823.GK2687@tyan-ft48-01.lab.bos.redhat.com> Reply-To: Jakub Jelinek References: <4DE3784F.6050201@codesourcery.com> <4E27358C.7050109@eagerm.com> <20110720202339.GJ2687@tyan-ft48-01.lab.bos.redhat.com> <4E273A7E.6090600@eagerm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4E273A7E.6090600@eagerm.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-IsSubscribed: yes Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org X-SW-Source: 2011-07/txt/msg01685.txt.bz2 On Wed, Jul 20, 2011 at 01:28:46PM -0700, Michael Eager wrote: > On 07/20/2011 01:23 PM, Jakub Jelinek wrote: > >On Wed, Jul 20, 2011 at 01:07:40PM -0700, Michael Eager wrote: > >>I've run into a problem with this change when building microblaze-xilinx-elf. > >> > >>When compiling _divdi3.o, cselib_expand_value_rtx_1 returns a huge rtx > >>tree for variable _r1 when max_depth is greater than 17. If -g is > >>specified, this later results in attempting to generate a DWARF location > >>list much larger than the 0xffff size limit, resulting in an assert failure. > > > >I think Alex is working on a patch which will hopefully improve it. > >In 4.6-RH in the mean time we are defaulting max-vartrack-expr-depth to 12 > >instead, perhaps that would be better than 10. > > I'm OK with a value of 12. The patch with s/10/12/g is preapproved. Jakub