From owner-freebsd-current@FreeBSD.ORG Wed Jul 25 10:05:38 2012 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E0495106564A; Wed, 25 Jul 2012 10:05:38 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 3BAAF8FC14; Wed, 25 Jul 2012 10:05:38 +0000 (UTC) Received: from skuns.kiev.zoral.com.ua (localhost [127.0.0.1]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id q6PA5i3r018120; Wed, 25 Jul 2012 13:05:44 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5) with ESMTP id q6PA5V0f087512; Wed, 25 Jul 2012 13:05:31 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5/Submit) id q6PA5VTJ087511; Wed, 25 Jul 2012 13:05:31 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 25 Jul 2012 13:05:31 +0300 From: Konstantin Belousov To: David Chisnall Message-ID: <20120725100531.GG2676@deviant.kiev.zoral.com.ua> References: <50097BF0.9010103@FreeBSD.org> <20120721211628.GE2676@deviant.kiev.zoral.com.ua> <6006581B-6B1C-4DFB-8662-3EB35869CA5F@FreeBSD.org> <20120722180119.GJ2676@deviant.kiev.zoral.com.ua> <20120723191856.GR2676@deviant.kiev.zoral.com.ua> <088BF877-50E6-42C5-98EF-DAB0FA52C348@freebsd.org> <05368BFA-F5F6-49D4-BE63-7C9360E54F54@FreeBSD.org> <20120724224338.GZ2676@deviant.kiev.zoral.com.ua> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Ek+w9ScjNaooOpN+" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-4.0 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: Kim Culhan , freebsd-current@freebsd.org, Dimitry Andric Subject: Re: -current build failure X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jul 2012 10:05:39 -0000 --Ek+w9ScjNaooOpN+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 25, 2012 at 09:03:58AM +0100, David Chisnall wrote: > On 24 Jul 2012, at 23:43, Konstantin Belousov wrote: >=20 > > As kan rightfully notes, the assumption that &%fs:0 =3D=3D *%fs:0 holds= for > > userspace on amd64, and the same is true for %gs userspace on i386. > > The change you committed to clang/llvm/whatever it called just breaks > > useful optimization for FreeBSD. >=20 > If you can suggest a way of differentiating the kernel and userspace comp= ilation targets, then I would be happy to hear it and will make the appropr= iate change. Until then, I would rather have slightly sub-optimal code i= n userspace than incorrect code in kernelspace. Try to differentiate on the memory layout model, the -mcmodel=3Dkernel thin= g. It shall be passed down to the very last stage of the backend, I believe. >=20 > > Sigh >=20 > Very helpful, thank you. >=20 > David --Ek+w9ScjNaooOpN+ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAlAPxOoACgkQC3+MBN1Mb4haIwCdF6UFMpLCg65rKGJV+XX4KtSF sgAAn1gvHvMq/pURBJUgxnWgFL5F8i+T =knC+ -----END PGP SIGNATURE----- --Ek+w9ScjNaooOpN+--