From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f177.google.com (mail-pf0-f177.google.com [209.85.192.177]) by mail.openembedded.org (Postfix) with ESMTP id 02BD3731C6 for ; Mon, 11 Jan 2016 20:04:02 +0000 (UTC) Received: by mail-pf0-f177.google.com with SMTP id q63so51070090pfb.1 for ; Mon, 11 Jan 2016 12:04:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:mime-version:content-type:from:in-reply-to:date:cc :message-id:references:to; bh=1RegJoCyHJ7mCxhg6YoWkiPEgiE5RBpmheCGi7FDgqI=; b=CVATERAiDNWeoTQHQEz1cvzZ2AxFLSuvP8Jz2NxUKfzRWjHIYtaqaRcIJDGCLluFAR JI319fnlN2CXBTv+btqBZglQ9pTf+wnl2z3e3gweBxEpY/ewJvCf1Jfo+/8gl6JMrhXl 8t+Oq61dXw/oVWOLGx2uYK0FAhzUP4b/Uxf1Q/WVDDq/iWtNHlVo0k1VTPiCJFneKtpX OQI5xg6K033RUT5Y3cS8/xbsNzcASV96i9q7atH5Ud41ab5hn4910zuWw3cNmWUPC/8G GA0GWAA9k9FdOwOOHf32VXisU/woCrZ3avw0zbufpuVQgJUs+7pvucM4C+sGIKsOpNGy dOQg== X-Received: by 10.98.16.65 with SMTP id y62mr29160110pfi.138.1452542643414; Mon, 11 Jan 2016 12:04:03 -0800 (PST) Received: from [192.168.0.4] (c-73-252-206-77.hsd1.ca.comcast.net. [73.252.206.77]) by smtp.gmail.com with ESMTPSA id 71sm25111217pfs.63.2016.01.11.12.04.02 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 11 Jan 2016 12:04:02 -0800 (PST) Mime-Version: 1.0 (Mac OS X Mail 9.2 \(3112\)) X-Pgp-Agent: GPGMail 2.6b2 From: Khem Raj In-Reply-To: <1452541920.1950.27.camel@pbcl.net> Date: Mon, 11 Jan 2016 12:03:57 -0800 Message-Id: <524FC047-DC8D-48AC-B08B-179E4C65E9F7@gmail.com> References: <1452256574-21587-1-git-send-email-Martin.Jansa@gmail.com> <1452257072-1799-1-git-send-email-Martin.Jansa@gmail.com> <20160108170054.GB2573@jama> <4A8643CE-5D1C-45E5-8E89-891B18CDE7A6@gmail.com> <1452541920.1950.27.camel@pbcl.net> To: Phil Blundell X-Mailer: Apple Mail (2.3112) Cc: OE Core mailing list Subject: Re: [PATCHv2][RFC] arch-armv7ve.inc: respect armv7a override as well X-BeenThere: openembedded-core@lists.openembedded.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Patches and discussions about the oe-core layer List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Jan 2016 20:04:05 -0000 X-Groupsio-MsgNum: 75869 Content-Type: multipart/signed; boundary="Apple-Mail=_82CC9008-D933-4B5C-A675-0BEF34AE9A94"; protocol="application/pgp-signature"; micalg=pgp-sha1 --Apple-Mail=_82CC9008-D933-4B5C-A675-0BEF34AE9A94 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On Jan 11, 2016, at 11:52 AM, Phil Blundell wrote: >=20 > On Mon, 2016-01-11 at 11:10 -0800, Khem Raj wrote: >> So I was asking was what improvements do we get if we choose armv7ve = as tune >> and I did not get any definitive answers. >=20 > If you compile with -march=3Darmv7ve then you get the integer divide > instructions, which are not enabled under -march=3Darmv7a. ah idiv. I was just thinking its few virt and security extensions that may not be used in instruction schedule by gcc but idiv = certainly will be used. >=20 >> Why shouldnt we keep using armv7-a and tune the handful of apps to >> armv7ve where it is required. >=20 > That'd be a distro decision. I agree that if you are targetting a mix > of cores, some that have hardware div and some that don't, it may not = be > sensible to compile everything twice and you might want to standardise > on armv7a as the least common denominator. But Cortex-A15 is > widespread, and I think people who select tune-cortexa15.inc would = have > a reasonable expectation that it would, indeed, tune for the > instructions that their processor supports. That's not to say that it > necessarily needs to be a generic armv7ve tune of course. I am with you for a15. >=20 >> We should strive to reduce this tuning mayhem >> on arm especially. >=20 > I agree with this, though. >=20 > p. >=20 >=20 --Apple-Mail=_82CC9008-D933-4B5C-A675-0BEF34AE9A94 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iEYEARECAAYFAlaUCrEACgkQuwUzVZGdMxS1KgCfZUA/BtAtjVkI1XOhL/RTq6hZ xtoAn3t8YoyEw2CnqUk1IceRfje2J8Uf =DkkK -----END PGP SIGNATURE----- --Apple-Mail=_82CC9008-D933-4B5C-A675-0BEF34AE9A94--