From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 4081 invoked by alias); 8 Jan 2013 15:55:16 -0000 Received: (qmail 3735 invoked by uid 48); 8 Jan 2013 15:54:47 -0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/55882] unaligned load/store : incorrect struct offset Date: Tue, 08 Jan 2013 15:55:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: WAITING X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- 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: 2013-01/txt/msg00664.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55882 --- Comment #8 from Richard Biener 2013-01-08 15:54:46 UTC --- Or more correct Index: gcc/emit-rtl.c =================================================================== --- gcc/emit-rtl.c (revision 195014) +++ gcc/emit-rtl.c (working copy) @@ -1839,7 +1839,12 @@ set_mem_attributes_minus_bitpos (rtx ref if (!align_computed) { - unsigned int obj_align = get_object_alignment (t); + unsigned int obj_align; + unsigned HOST_WIDE_INT obj_bitpos; + get_object_alignment_1 (t, &obj_align, &obj_bitpos); + obj_bitpos = (obj_bitpos + apply_bitpos) & (obj_align - 1); + if (obj_bitpos != 0) + obj_align = (obj_bitpos & -obj_bitpos); attrs.align = MAX (attrs.align, obj_align); } }