From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 10768 invoked by alias); 8 Nov 2012 23:22:01 -0000 Received: (qmail 10721 invoked by uid 48); 8 Nov 2012 23:21:45 -0000 From: "ebotcazou at gcc dot gnu.org" 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 23:22:00 -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: ebotcazou at gcc dot gnu.org 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/msg00783.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55142 --- Comment #29 from Eric Botcazou 2012-11-08 23:21:44 UTC --- > So for POINTERS_EXTEND_UNSIGNED > 0, we should transform > > (zero_extend:DI (plus:SI (FOO:SI) (const_int Y))) > > in such a way that it won't cause ICE and zero-extend the > result. For X32, we just need to generate > > (plus:SI (REG:SI) (const_int Y)) The ICE is a minor detail, the real issue is convert_memory_address_addr_space and PR middle-end/49721. The unmodified compiler generates the same problematic instructions for the full testcase without -fPIC. It's clear that Richard's change, aka the un-sign-extension of sizetype constants, is an earthquake here.