Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932361AbWAZRb6 (ORCPT ); Thu, 26 Jan 2006 12:31:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751198AbWAZRb6 (ORCPT ); Thu, 26 Jan 2006 12:31:58 -0500 Received: from are.twiddle.net ([64.81.246.98]:6037 "EHLO are.twiddle.net") by vger.kernel.org with ESMTP id S1751100AbWAZRb4 (ORCPT ); Thu, 26 Jan 2006 12:31:56 -0500 Date: Thu, 26 Jan 2006 09:30:14 -0800 From: Richard Henderson To: Edgar Toernig Cc: Akinobu Mita , linux-kernel@vger.kernel.org, Ivan Kokshaysky , Ian Molton , dev-etrax@axis.com, David Howells , Yoshinori Sato , Linus Torvalds , linux-ia64@vger.kernel.org, Hirokazu Takata , linux-m68k@vger.kernel.org, Greg Ungerer , linux-mips@linux-mips.org, parisc-linux@parisc-linux.org, linuxppc-dev@ozlabs.org, linux390@de.ibm.com, linuxsh-dev@lists.sourceforge.net, linuxsh-shmedia-dev@lists.sourceforge.net, sparclinux@vger.kernel.org, ultralinux@vger.kernel.org, Miles Bader , Andi Kleen , Chris Zankel Subject: Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h Message-ID: <20060126173014.GC5592@twiddle.net> Mail-Followup-To: Edgar Toernig , Akinobu Mita , linux-kernel@vger.kernel.org, Ivan Kokshaysky , Ian Molton , dev-etrax@axis.com, David Howells , Yoshinori Sato , Linus Torvalds , linux-ia64@vger.kernel.org, Hirokazu Takata , linux-m68k@vger.kernel.org, Greg Ungerer , linux-mips@linux-mips.org, parisc-linux@parisc-linux.org, linuxppc-dev@ozlabs.org, linux390@de.ibm.com, linuxsh-dev@lists.sourceforge.net, linuxsh-shmedia-dev@lists.sourceforge.net, sparclinux@vger.kernel.org, ultralinux@vger.kernel.org, Miles Bader , Andi Kleen , Chris Zankel References: <20060125112625.GA18584@miraclelinux.com> <20060125113206.GD18584@miraclelinux.com> <20060125200250.GA26443@flint.arm.linux.org.uk> <20060126000618.GA5592@twiddle.net> <20060126053412.0da7f505.froese@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060126053412.0da7f505.froese@gmx.de> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 529 Lines: 14 On Thu, Jan 26, 2006 at 05:34:12AM +0100, Edgar Toernig wrote: > Why shift at all? Becuase that *is* a valid architecture tuning knob. Most risc machines can't AND with arbitrary constants like that, and loading the constant might bulk things up more than just using the shift. r~ - 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/