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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:38012) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kjk0G-0006sS-IF; Mon, 30 Nov 2020 14:18:08 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1kjk0C-00054X-SR; Mon, 30 Nov 2020 14:18:04 +0000 Date: Mon, 30 Nov 2020 14:18:04 +0000 From: Russell King - ARM Linux admin To: David Laight Subject: Re: [RESEND,PATCH] ARM: fix __div64_32() error when compiling with clang Message-ID: <20201130141804.GV1551@shell.armlinux.org.uk> References: <20201123073634.6854-1-swpenim@gmail.com> <20201130102122.GT1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201130_091818_519430_EB208620 X-CRM114-Status: GOOD ( 14.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nicolas Pitre , Antony Yu , Nick Desaulniers , Linux Kernel Mailing List , clang-built-linux , Nathan Chancellor , 'Ard Biesheuvel' , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Nov 30, 2020 at 01:58:27PM +0000, David Laight wrote: > > And actually, the same applies on BE, but the other way around. So we > > should mark __xl as an output register as well, as __xl will assume > > the right value depending on the endianness. > > Why not use "+r" to indicate than an 'output' parameter is also > used as an input. > > Rather cleaner than specifying the same C variable as both > input and output. You have an incorrect understanding. "__n" is the input operand in r0. "__rem" is the output operand in r0/r1. No single C variable is used as both an input and an output. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel