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Date: Wed, 03 Nov 2004 17:51:00 -0000
From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20041103175151.18287.ebotcazou@gcc.gnu.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c/18287] New: Unaligned access to fields inside packed records
X-Bugzilla-Reason: CC
X-SW-Source: 2004-11/txt/msg00363.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The testcase I'm about to attach generates a bug error at runtime on the SPARC
(and very likely on any other STRICT_ALIGNMENT target).  Verified with 2.95.3,
3.3.x, 3.4.x and 4.0pre.

I think the front-end wrongly turns ADDR_EXPR<COMPONENT_REF<INDIRECT_REF>> into
PLUS_EXPR whatever the alignment of the field.  For reference, the Ada front-end
doesn't do the simplification and lets the middle-end generate the temporary if
required.

-- 
           Summary: Unaligned access to fields inside packed records
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ebotcazou at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: *-*-*
  GCC host triplet: *-*-*
GCC target triplet: *-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18287