Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757174Ab3JNQmW (ORCPT ); Mon, 14 Oct 2013 12:42:22 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:49748 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756467Ab3JNQmU (ORCPT ); Mon, 14 Oct 2013 12:42:20 -0400 Date: Mon, 14 Oct 2013 17:41:34 +0100 From: Will Deacon To: Russell King - ARM Linux Cc: Jiang Liu , Steven Rostedt , Catalin Marinas , Sandeepa Prabhu , Jiang Liu , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64 Message-ID: <20131014164134.GP10491@mudshark.cambridge.arm.com> References: <1381675827-1610-1-git-send-email-liuj97@gmail.com> <20131014154044.GR25034@n2100.arm.linux.org.uk> <525C1469.4000906@gmail.com> <20131014160419.GS25034@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131014160419.GS25034@n2100.arm.linux.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1465 Lines: 32 On Mon, Oct 14, 2013 at 05:04:20PM +0100, Russell King - ARM Linux wrote: > > On 10/14/2013 11:40 PM, Russell King - ARM Linux wrote: > | In the simplest case, a `%' followed by a digit N says to output > | operand N at that point in the string. > | > | `%' followed by a letter and a digit says to output an operand in an > | alternate fashion. Four letters have standard, built-in meanings > | described below. The machine description macro `PRINT_OPERAND' can > | define additional letters with nonstandard meanings. > | > | `%cDIGIT' can be used to substitute an operand that is a constant > | value without the syntax that normally indicates an immediate operand. > | ... > | `%lDIGIT' is used to substitute a `label_ref' into a jump instruction. > > %lDIGIT is used (but not commented upon) in the gcc extended asm > documentation where it talks about asm gotos, so there's probably a doc > bug here too about whether these options should be described in the > main doc as well. > > Nevertheness, this section is documenting the _internals_ of gcc, and > it seems perverse for a gcc backend to ignore something that is > documented as being a standard part of gcc. I'll make sure this gets fixed. Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/