Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932154AbcDVQ5N (ORCPT ); Fri, 22 Apr 2016 12:57:13 -0400 Received: from mail-qg0-f66.google.com ([209.85.192.66]:36709 "EHLO mail-qg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753878AbcDVQ5L (ORCPT ); Fri, 22 Apr 2016 12:57:11 -0400 Subject: Re: [RFC][PATCH 02/31] locking,alpha: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}() To: Peter Zijlstra , torvalds@linux-foundation.org, mingo@kernel.org, tglx@linutronix.de, will.deacon@arm.com, paulmck@linux.vnet.ibm.com, boqun.feng@gmail.com, waiman.long@hpe.com, fweisbec@gmail.com References: <20160422090413.393652501@infradead.org> <20160422093923.156825130@infradead.org> Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, vgupta@synopsys.com, linux@arm.linux.org.uk, egtvedt@samfundet.no, realmz6@gmail.com, ysato@users.sourceforge.jp, rkuo@codeaurora.org, tony.luck@intel.com, geert@linux-m68k.org, james.hogan@imgtec.com, ralf@linux-mips.org, dhowells@redhat.com, jejb@parisc-linux.org, mpe@ellerman.id.au, schwidefsky@de.ibm.com, dalias@libc.org, davem@davemloft.net, cmetcalf@mellanox.com, jcmvbkbc@gmail.com, arnd@arndb.de, dbueso@suse.de, fengguang.wu@intel.com From: Richard Henderson Message-ID: <571A57E0.1040704@twiddle.net> Date: Fri, 22 Apr 2016 09:57:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 MIME-Version: 1.0 In-Reply-To: <20160422093923.156825130@infradead.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 249 Lines: 14 On 04/22/2016 02:04 AM, Peter Zijlstra wrote: > + "1: ldl_l %0,%1\n" \ > + " mov %0,%2\n" \ > + " " #asm_op " %0,%3,%0\n" \ > + " stl_c %0,%1\n" \ No need for the extra mov. ldl_l %2,%1 asm_op %2,%3,%0 stl_c %0,%1 r~