From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12991 invoked by alias); 16 Jul 2013 15:06:48 -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 8704 invoked by uid 48); 16 Jul 2013 15:04:46 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/57908] alignment of arrays allocated stack on amd64/x86_64: 16 bytes ? Date: Tue, 16 Jul 2013 15:06:00 -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: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: RESOLVED 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: cf_gcctarget bug_status component resolution 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/msg00786.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57908 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |x86_64-*-linux-gnu Status|UNCONFIRMED |RESOLVED Component|c |target Resolution|--- |INVALID --- Comment #3 from Andrew Pinski --- > As I understand the ABI specifications, arrays allocated on stack must be > aligned on 16 bytes boundaries, whatever its length is HUH? I don't read it that way. I read if the length is less than 16 bytes then it is same alignment as its elements; otherwise it is 16byte aligned. It does require VLAs to have 16byte alignment though.