From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-427299-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 18455 invoked by alias); 3 Aug 2013 22:46:41 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 18389 invoked by uid 48); 3 Aug 2013 22:46:39 -0000
From: "david.abdurachmanov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/58065] ARM MALLOC_ABI_ALIGNMENT is wrong
Date: Sat, 03 Aug 2013 22:46:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: david.abdurachmanov at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: cc
Message-ID: <bug-58065-4-p6wDJ9vJHN@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-58065-4@http.gcc.gnu.org/bugzilla/>
References: <bug-58065-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-08/txt/msg00223.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58065

David Abdurachmanov <david.abdurachmanov at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |david.abdurachmanov at gmail dot c
                   |                            |om

--- Comment #5 from David Abdurachmanov <david.abdurachmanov at gmail dot com> ---
malloc() [glibc implementation] default alignment is sizeof(long double) or 2 *
sizeof(size_t) if I remember correctly, which is 8 bytes for ARMv7. I think,
based on C and C++ standard you have to make sure that alignment is good for
whatever primitive type, which means alignment size being the size of the
biggest primitive type (long double).

Reference bug ticket(9 years old):
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15795

Quote from C standard (identical or similar exist in C++):

The pointer returned if the allocation succeeds is suitably aligned so that
it may be assigned to a pointer to any type of object and then used to
access such an object or an array of such objects in the space allocated
(until the space is explicitly deallocated).