From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21270 invoked by alias); 8 Nov 2012 16:24:35 -0000 Received: (qmail 21196 invoked by uid 48); 8 Nov 2012 16:24:14 -0000 From: "ubizjak at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/55142] [4.8 Regression] internal compiler error: in plus_constant, at explow.c:88 Date: Thu, 08 Nov 2012 16:24:00 -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: X-Bugzilla-Severity: normal X-Bugzilla-Who: ubizjak at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: ebotcazou at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.8.0 X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-11/txt/msg00739.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55142 --- Comment #25 from Uros Bizjak 2012-11-08 16:24:12 UTC --- (In reply to comment #24) > I think the most robust solution would be to always zero-extend the addresses > for -mx32, i.e. output > movl %ecx, -1073743664(%eax) > even if the address is a PLUS in DImode. Otherwise, we're left with kludges... No, this would be one giant kludge by itself. The failure just shows that the controversial patch [1] for PR 49721 was wrong. Quote from [1]: --quote-- I am checking in this patch, which only affects x32 and nothing else. This one character change, from POINTERS_EXTEND_UNSIGNED < 0 to POINTERS_EXTEND_UNSIGNED != 0 creates a working x32 GCC. This isn't perfect. I have tried many different approaches without any success. I will revisit it if we run into any problems with x32 applications. --/qoute-- So, we run into problem. [1] http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01618.html