From owner-freebsd-toolchain@freebsd.org Thu May 26 22:10:13 2016 Return-Path: Delivered-To: freebsd-toolchain@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B1885B4CC5C for ; Thu, 26 May 2016 22:10:13 +0000 (UTC) (envelope-from markmi@dsl-only.net) Received: from asp.reflexion.net (outbound-mail-211-172.reflexion.net [208.70.211.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 658851FA4 for ; Thu, 26 May 2016 22:10:12 +0000 (UTC) (envelope-from markmi@dsl-only.net) Received: (qmail 11117 invoked from network); 26 May 2016 22:03:23 -0000 Received: from unknown (HELO rtc-sm-01.app.dca.reflexion.local) (10.81.150.1) by 0 (rfx-qmail) with SMTP; 26 May 2016 22:03:23 -0000 Received: by rtc-sm-01.app.dca.reflexion.local (Reflexion email security v7.90.3) with SMTP; Thu, 26 May 2016 18:03:32 -0400 (EDT) Received: (qmail 8767 invoked from network); 26 May 2016 22:03:32 -0000 Received: from unknown (HELO iron2.pdx.net) (69.64.224.71) by 0 (rfx-qmail) with SMTP; 26 May 2016 22:03:32 -0000 X-No-Relay: not in my network X-No-Relay: not in my network X-No-Relay: not in my network X-No-Relay: not in my network Received: from [192.168.1.8] (c-76-115-7-162.hsd1.or.comcast.net [76.115.7.162]) by iron2.pdx.net (Postfix) with ESMTPSA id CFFF61C43D6; Thu, 26 May 2016 15:03:22 -0700 (PDT) From: Mark Millard Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Are there SPARC [or other] aligned memory access requirements to avoid exceptions? [now that 11.0's armv6/v7 is allowing more unaligned accesses] Date: Thu, 26 May 2016 15:03:26 -0700 Message-Id: <7AFD3661-9764-434B-A387-FD31B62DD77E@dsl-only.net> Cc: freebsd-arm , FreeBSD Toolchain , mandree@FreeBSD.org To: freebsd-sparc64@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) X-Mailer: Apple Mail (2.3124) X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 May 2016 22:10:13 -0000 Is is safe to interpret that an rpi2 armv7/cortex-a7 unaligned access = failure [from before -r300694] would (likely?) also be a failure on some = forms of FreeBSD SPARC use? Why I ask: One of the ports that I had submitted a bug report for unaligned access = problems on a rpi2 (armv7-a/cortex-a7 style handling) was: archivers/lzo2 ( https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207096 ). I'd = recently commented that the report might go away after testing what is = now -r300694 (allowing more unaligned access on, for example, = armv7-a/cortex-a7). Matthias Andree has since asked in a comment: > ISTR SPARC architectures also barf on unaligned access, so is it worth = bothering the upstream author? I have generally stuck to architectures for which I have examples to = observe, if nothing else than to validate at least some of my = understanding that is from reading materials. I normally only submit = what I've observed in some form. I've no such SPARC context nor do I have knowledge/reference material = for SPARCs. Nor am I familiar with the choices FreeBSD may have made for = SPARC configuration coverage. As a matter of hear-say my impression is that some SPARCs can be = configured to require some variation of strict alignment. But I do not know how much I can infer from what I observed on a rpi2 = (armv7-a/cortex-a7) to FreeBSD SPARC use getting similar results for at = least come configurations. Nor do I have access to a test environment = for SPARC. So I wonder if my archivers/lzo2 submittal in question should survive = because of SPARC even if the problem is validated to go away for the = updated rpi2 like contexts (with armv7-a/cortex-a7 tailoring possibly = involved). I have some other submittals that might face the same type of = question. =3D=3D=3D Mark Millard markmi at dsl-only.net