From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-493756-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 2075 invoked by alias); 30 Jul 2015 14:41:39 -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 2012 invoked by uid 48); 30 Jul 2015 14:41:34 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/66917] [4.9/5/6 regression] ARM: NEON: memcpy compiles to vst1 with incorrect alignment due to SRA
Date: Thu, 30 Jul 2015 14:41:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 4.9.3
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: major
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution:
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.9.4
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields:
Message-ID: <bug-66917-4-9xvjmcSbNm@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-66917-4@http.gcc.gnu.org/bugzilla/>
References: <bug-66917-4@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: 2015-07/txt/msg02646.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66917

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
For both loads and stores we do

              else if (DR_MISALIGNMENT (first_dr) == -1)
                {
                  TREE_TYPE (data_ref)
                    = build_aligned_type (TREE_TYPE (data_ref),
                                          TYPE_ALIGN (elem_type));
                  align = TYPE_ALIGN_UNIT (elem_type);
                  misalign = 0;

but TYPE_ALIGN (elem_type) doesn't always hold.