Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h

To:	Edgar Toernig <froese@gmx.de>
Subject:	Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h
From:	Richard Henderson <rth@twiddle.net>
Date:	Thu, 26 Jan 2006 09:30:14 -0800
Cc:	Akinobu Mita <mita@miraclelinux.com>, linux-kernel@vger.kernel.org, Ivan Kokshaysky <ink@jurassic.park.msu.ru>, Ian Molton <spyro@f2s.com>, dev-etrax@axis.com, David Howells <dhowells@redhat.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Linus Torvalds <torvalds@osdl.org>, linux-ia64@vger.kernel.org, Hirokazu Takata <takata@linux-m32r.org>, linux-m68k@vger.kernel.org, Greg Ungerer <gerg@uclinux.org>, 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 <uclinux-v850@lsi.nec.co.jp>, Andi Kleen <ak@suse.de>, Chris Zankel <chris@zankel.net>
In-reply-to:	<20060126053412.0da7f505.froese@gmx.de>
Mail-followup-to:	Edgar Toernig <froese@gmx.de>, Akinobu Mita <mita@miraclelinux.com>, linux-kernel@vger.kernel.org, Ivan Kokshaysky <ink@jurassic.park.msu.ru>, Ian Molton <spyro@f2s.com>, dev-etrax@axis.com, David Howells <dhowells@redhat.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Linus Torvalds <torvalds@osdl.org>, linux-ia64@vger.kernel.org, Hirokazu Takata <takata@linux-m32r.org>, linux-m68k@vger.kernel.org, Greg Ungerer <gerg@uclinux.org>, 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 <uclinux-v850@lsi.nec.co.jp>, Andi Kleen <ak@suse.de>, Chris Zankel <chris@zankel.net>
Original-recipient:	rfc822;linux-mips@linux-mips.org
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>
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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~

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Re: [PATCH 1/6] {set,clear,test}_bit() related cleanup, (continued) Re: [PATCH 1/6] {set,clear,test}_bit() related cleanup, Russell King Re: [PATCH 1/6] {set,clear,test}_bit() related cleanup, Paul Jackson *[PATCH 2/6] use non atomic operations for minix__bit() and ext2__bit(), Akinobu Mita* *[PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Akinobu Mita* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Keith Owens* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Akinobu Mita* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Russell King* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Ian Molton* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Richard Henderson* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Edgar Toernig* *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Richard Henderson* <= *Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Russell King* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Grant Grundler* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Nicolas Pitre* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Russell King* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Grant Grundler* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Russell King* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Stuart Brady* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, David S. Miller* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Ralf Baechle* *Re: [parisc-linux] Re: [PATCH 3/6] C-language equivalents of include/asm-/bitops.h*, Stuart Brady*

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