From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38769) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ceoHe-0005oB-Qj for qemu-devel@nongnu.org; Fri, 17 Feb 2017 14:33:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ceoHa-0007hv-SX for qemu-devel@nongnu.org; Fri, 17 Feb 2017 14:33:34 -0500 Sender: Richard Henderson References: <1486636445-24109-1-git-send-email-nikunj@linux.vnet.ibm.com> <1486636445-24109-6-git-send-email-nikunj@linux.vnet.ibm.com> <20170210001035.GJ27610@umbus.fritz.box> <87k28yekze.fsf@abhimanyu.i-did-not-set--mail-host-address--so-tickle-me> <20170214024331.GD2169@umbus.fritz.box> <87o9y5eale.fsf@abhimanyu.i-did-not-set--mail-host-address--so-tickle-me> <2094c8e6-2b99-9c09-7eb2-c013dd07ec1e@twiddle.net> <87efyy7mex.fsf@abhimanyu.i-did-not-set--mail-host-address--so-tickle-me> <1d8317b8-208f-db66-0222-bf1beaaa965e@twiddle.net> <87y3x51l00.fsf@abhimanyu.i-did-not-set--mail-host-address--so-tickle-me> From: Richard Henderson Message-ID: Date: Sat, 18 Feb 2017 06:33:22 +1100 MIME-Version: 1.0 In-Reply-To: <87y3x51l00.fsf@abhimanyu.i-did-not-set--mail-host-address--so-tickle-me> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 5/6] target-ppc: support for 32-bit carry and overflow List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Nikunj A Dadhania , David Gibson Cc: bharata@linux.vnet.ibm.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org On 02/17/2017 03:47 PM, Nikunj A Dadhania wrote: >> Why do you want to extract these bits? > > Convinient to copy that to XER later. Ideally you make the most common operation cheapest, and the more rare operation more expensive. That said, I suppose even using ADDO is rare in the first place. So it probably doesn't much matter. r~