From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lo.gmane.org ([80.91.229.12]) by linuxtogo.org with esmtp (Exim 4.69) (envelope-from ) id 1PE71G-0003Ko-Qp for openembedded-devel@lists.openembedded.org; Thu, 04 Nov 2010 22:06:53 +0100 Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1PE70H-0006Pi-Jm for openembedded-devel@lists.openembedded.org; Thu, 04 Nov 2010 22:05:49 +0100 Received: from ip545070eb.adsl-surfen.hetnet.nl ([84.80.112.235]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Nov 2010 22:05:49 +0100 Received: from k.kooi by ip545070eb.adsl-surfen.hetnet.nl with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Nov 2010 22:05:49 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: openembedded-devel@lists.openembedded.org From: Koen Kooi Date: Thu, 04 Nov 2010 22:05:37 +0100 Message-ID: References: <1288864342-20973-1-git-send-email-eric@eukrea.com> <4CD2FAF0.4080905@freyther.de> Mime-Version: 1.0 X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: ip545070eb.adsl-surfen.hetnet.nl User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.14) Gecko/20101002 Shredder/3.0.9pre In-Reply-To: <4CD2FAF0.4080905@freyther.de> X-Enigmail-Version: 1.0.1 X-SA-Exim-Connect-IP: 80.91.229.12 X-SA-Exim-Mail-From: gcho-openembedded-devel@m.gmane.org X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on discovery X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS, SPF_PASS autolearn=ham version=3.2.5 X-SA-Exim-Version: 4.2.1 (built Wed, 25 Jun 2008 17:20:07 +0000) X-SA-Exim-Scanned: Yes (on linuxtogo.org) Subject: Re: [PATCH/RFC] qt4-embedded: tune QT_ARCH for armv6 X-BeenThere: openembedded-devel@lists.openembedded.org X-Mailman-Version: 2.1.11 Precedence: list Reply-To: openembedded-devel@lists.openembedded.org List-Id: Using the OpenEmbedded metadata to build Distributions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Nov 2010 21:06:54 -0000 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 04-11-10 19:26, Holger Freyther wrote: > On 11/04/2010 10:52 AM, Eric Bénard wrote: >> this is a RFC, I think it can also be used on qt 4.6.x and on armv7. >> Setting QT_ARCH to armv6 enable some asm optimized functions in QT. > > Do you know the consequences of this change? E.g. in the painting > engine unaligned memory access will be allowed. I am not sure that Nokia has > ever benchmarked what is faster (aligned/unaligned) access. So it would be > very interesting to know the perf difference. E.g. use qttracereply to measure it. > > Phil do you happen to know why unaligned access got allowed starting from > armv6? How fast will it be? - From previous experiments the "hardware" unaligned was the same speed as the sw fixup on armv6. regards, Koen -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) iD8DBQFM0yAhMkyGM64RGpERAo+KAKCLzq/F9/dH/viPTMDWqpIRcv5k8QCgjoAG BU6Ps9W+NUB0nSNOA/yT1hw= =TT6S -----END PGP SIGNATURE-----