From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3145 invoked by alias); 31 May 2011 16:17:48 -0000 Received: (qmail 3136 invoked by uid 22791); 31 May 2011 16:17:44 -0000 X-SWARE-Spam-Status: No, hits=-5.8 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD 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; Tue, 31 May 2011 16:17:04 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p4VGGujm025851 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 31 May 2011 12:16:57 -0400 Received: from freie.oliva.athome.lsd.ic.unicamp.br (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p4VGGnaJ006296 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 31 May 2011 12:16:56 -0400 Received: from livre.localdomain (livre-to-gw.oliva.athome.lsd.ic.unicamp.br [172.31.160.19]) by freie.oliva.athome.lsd.ic.unicamp.br (8.14.4/8.14.4) with ESMTP id p4VGGmqE023917; Tue, 31 May 2011 13:16:48 -0300 Received: from livre.localdomain (aoliva@localhost.localdomain [127.0.0.1]) by livre.localdomain (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id p4VGDgFL012302; Tue, 31 May 2011 13:13:42 -0300 Received: (from aoliva@localhost) by livre.localdomain (8.14.3/8.14.3/Submit) id p4VGDWvs012300; Tue, 31 May 2011 13:13:32 -0300 From: Alexandre Oliva To: Bernd Schmidt Cc: gcc-patches@gcc.gnu.org Subject: Re: introduce --param max-vartrack-expr-depth References: <4DE3784F.6050201@codesourcery.com> Date: Tue, 31 May 2011 17:47:00 -0000 In-Reply-To: <4DE3784F.6050201@codesourcery.com> (Bernd Schmidt's message of "Mon, 30 May 2011 12:58:23 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii 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: 2011-05/txt/msg02446.txt.bz2 On May 30, 2011, Bernd Schmidt wrote: > On 05/30/2011 12:35 PM, Alexandre Oliva wrote: >> One of my patches for PR 48866 regressed guality/asm-1.c on >> x86_64-linux-gnu because what used to be a single complex debug value >> expression became a chain of debug temps holding simpler expressions, >> and this chain exceeded the default recursion depth in resolving >> location expressions. > What's the worst that can happen if you remove the limit altogether? Exponential behavior comes to mind. I will try a bootstrap with a very high value, but for pathological cases we'd probably still need the param anyway, so I'll check it in. Thanks for the reviews. -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer