From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7035 invoked by alias); 23 Jul 2013 23:40:30 -0000 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 Received: (qmail 6940 invoked by uid 48); 23 Jul 2013 23:40:27 -0000 From: "dje at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/57955] [4.6/4.7/4.8/4.9 Regression] Uniquization of constants reduces alignment of initializers Date: Tue, 23 Jul 2013 23:40:00 -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-Version: 4.6.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: dje at gcc dot gnu.org X-Bugzilla-Status: NEW 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: short_desc Message-ID: In-Reply-To: References: 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: 2013-07/txt/msg01098.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57955 David Edelsohn changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|Uniquization of constants |[4.6/4.7/4.8/4.9 |breaks constant alignment |Regression] Uniquization of | |constants reduces alignment | |of initializers --- Comment #5 from David Edelsohn --- It was an undocumented change in GCC behavior. I infer from the name that the testcase was trying to test that a block move of appropriate alignment used VMX instructions. I will see if I can construct a testcase with memcpy directly.