From: Andi Kleen <ak@suse.de>
To: Akinobu Mita <mita@miraclelinux.com>
Cc: linux-mips@linux-mips.org, linux-ia64@vger.kernel.org,
Ian Molton <spyro@f2s.com>, David Howells <dhowells@redhat.com>,
linuxppc-dev@ozlabs.org, Greg Ungerer <gerg@uclinux.org>,
sparclinux@vger.kernel.org,
Miles Bader <uclinux-v850@lsi.nec.co.jp>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Hirokazu Takata <takata@linux-m32r.org>,
linuxsh-dev@lists.sourceforge.net,
Linus Torvalds <torvalds@osdl.org>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Richard Henderson <rth@twiddle.net>,
Chris Zankel <chris@zankel.net>,
dev-etrax@axis.com, ultralinux@vger.kernel.org,
linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org,
linuxsh-shmedia-dev@lists.sourceforge.net, linux390@de.ibm.com,
Russell King <rmk@arm.linux.org.uk>,
parisc-linux@parisc-linux.org
Subject: Re: [patch 14/44] generic hweight{64,32,16,8}()
Date: Wed, 1 Feb 2006 10:06:07 +0100 [thread overview]
Message-ID: <200602011006.09596.ak@suse.de> (raw)
In-Reply-To: <20060201090325.905071000@localhost.localdomain>
On Wednesday 01 February 2006 10:02, Akinobu Mita wrote:
> +static inline unsigned int hweight32(unsigned int w)
> +{
> + unsigned int res = (w & 0x55555555) + ((w >> 1) & 0x55555555);
> + res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
> + res = (res & 0x0F0F0F0F) + ((res >> 4) & 0x0F0F0F0F);
> + res = (res & 0x00FF00FF) + ((res >> 8) & 0x00FF00FF);
> + return (res & 0x0000FFFF) + ((res >> 16) & 0x0000FFFF);
> +}
How large are these functions on x86? Maybe it would be better to not inline them,
but put it into some C file out of line.
-Andi
next prev parent reply other threads:[~2006-02-01 9:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060201090224.536581000@localhost.localdomain>
2006-02-01 9:02 ` [patch 06/44] generic __{, test_and_}{set, clear, change}_bit() and test_bit() Akinobu Mita
2006-02-01 9:02 ` [patch 10/44] generic fls64() Akinobu Mita
2006-02-01 9:02 ` [patch 12/44] generic sched_find_first_bit() Akinobu Mita
2006-02-03 3:58 ` [parisc-linux] " Grant Grundler
2006-02-01 9:02 ` [patch 14/44] generic hweight{64,32,16,8}() Akinobu Mita
2006-02-01 9:06 ` Andi Kleen [this message]
2006-02-01 9:26 ` Michael Tokarev
2006-02-01 10:24 ` Andi Kleen
2006-02-02 12:50 ` Akinobu Mita
2006-02-02 1:26 ` Gabriel Paubert
2006-02-06 11:52 ` Akinobu Mita
2006-02-03 8:31 ` Ulrich Eckhardt
2006-02-01 9:02 ` [patch 31/44] powerpc: use generic bitops Akinobu Mita
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