From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756437Ab3CMNfY (ORCPT ); Wed, 13 Mar 2013 09:35:24 -0400 Received: from mga01.intel.com ([192.55.52.88]:35405 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751901Ab3CMNfW (ORCPT ); Wed, 13 Mar 2013 09:35:22 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,837,1355126400"; d="p7s'?scan'208";a="305535652" From: "Woodhouse, David" To: Kim Phillips CC: Nicolas Pitre , Russell King - ARM Linux , Borislav Petkov , Andrew Morton , Daniel Santos , David Rientjes , Rusty Russell , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Rob Herring Subject: Re: [RFC] arm: use built-in byte swap function Thread-Topic: [RFC] arm: use built-in byte swap function Thread-Index: AQHOBNEeAGqv37iTaki0VQignhSLCJhus/aAgAGxes+AAC2C8IAAKGEAgAAi1ICAETzsgIAhum0A Date: Wed, 13 Mar 2013 13:35:05 +0000 Message-ID: <1363181704.32099.360.camel@i7.infradead.org> References: <20130129181046.GC25415@pd.tnic> <1359541333.3529.186.camel@shinybook.infradead.org> <20130130200900.9d7cf7908caeaef4ecee1d61@freescale.com> <20130131092801.GV23505@n2100.arm.linux.org.uk> <20130131145947.f62474a0600848df86548b96@freescale.com> <20130201011712.GF23505@n2100.arm.linux.org.uk> <1359703995.23531.6.camel@shinybook.infradead.org> <20130205210436.670c62e26d2121330e87af35@freescale.com> <1360141322.6066.4.camel@shinybook.infradead.org> <20130206191905.ac8eb6743e69425f30888704@freescale.com> <20130207181315.GM17833@n2100.arm.linux.org.uk> <1360344301.6066.263.camel@shinybook.infradead.org> <1360363233.6066.283.camel@shinybook.infradead.org> <20130208191208.2ef3d78bda71aa7b44d00d7b@freescale.com> <20130219203115.114eab79e8d2099c6306d921@freescale.com> In-Reply-To: <20130219203115.114eab79e8d2099c6306d921@freescale.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Content-Type: multipart/signed; micalg=sha1; protocol="application/x-pkcs7-signature"; boundary="=-BYjR/2CehHJBR52zFx2+" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-BYjR/2CehHJBR52zFx2+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2013-02-19 at 20:31 -0600, Kim Phillips wrote: >=20 > > > imx_v6_v7_defconfig: 7672373 7667089 -5284 > > > lart_defconfig: 2941150 2941054 -96 > > > mxs_defconfig: 11091983 11095679 3696 > >=20 > > The savings are good, with some impressive cases. However the=20 > > mxs_defconfig is completely the opposite and by far. Any idea? >=20 > Unfortunately, I don't seem to be able to reproduce this anymore. > Same linux-next, with three different compilers always produces > smaller binaries: >=20 > text data bss dec hex filename > 5239363 280576 5569648 11089587 a936b3 linux-next-mxs-orig-gcc4.= 7/vmlinux > 5239169 280556 5569648 11089373 a935dd linux-next-mxs-bswap-gcc4= .7/vmlinux >=20 > 5262223 280592 5569648 11112463 a9900f linux-next-mxs-orig-gcc4.= 6.3/vmlinux > 5261909 280584 5569648 11112141 a98ecd linux-next-mxs-bswap-gcc4= .6.3/vmlinux >=20 > 5241379 280580 5569648 11091607 a93e97 linux-next-mxs-orig-gcc4.= 6ubuntu/vmlinux > 5241189 280600 5569648 11091437 a93ded linux-next-mxs-bswap-gcc4= .6ubuntu/vmlinux >=20 > So I've since made a more consistent cross-build environment, using > cross tools from Linaro [1,2] instead of via Ubuntu [3]. Andrew Pinski has done some work on GCC to support further optimisations: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55177 If you feel like building with the branch at http://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dshortlog;h=3Drefs/heads/pinskia/byt= ewiseunop and seeing how that affects the results, that could be interestin= g. --=20 Sent with MeeGo's ActiveSync support. 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