From owner-freebsd-arch@FreeBSD.ORG  Tue Jan 13 18:31:50 2009
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 35A921065675
	for <freebsd-arch@freebsd.org>; Tue, 13 Jan 2009 18:31:50 +0000 (UTC)
	(envelope-from prvs=julian=257c50d56@elischer.org)
Received: from smtp-outbound.ironport.com (smtp-outbound.ironport.com
	[63.251.108.112])
	by mx1.freebsd.org (Postfix) with ESMTP id 1EF3F8FC1E
	for <freebsd-arch@freebsd.org>; Tue, 13 Jan 2009 18:31:50 +0000 (UTC)
	(envelope-from prvs=julian=257c50d56@elischer.org)
Received: from unknown (HELO julian-mac.elischer.org) ([10.251.60.222])
	by smtp-outbound.ironport.com with ESMTP; 13 Jan 2009 10:03:15 -0800
Message-ID: <496CD763.80107@elischer.org>
Date: Tue, 13 Jan 2009 10:03:15 -0800
From: Julian Elischer <julian@elischer.org>
User-Agent: Thunderbird 2.0.0.19 (Macintosh/20081209)
MIME-Version: 1.0
To: Bruce Evans <brde@optusnet.com.au>
References: <4966B5D4.7040709@delphij.net>
	<86zlhw5zsr.fsf@ds4.des.no>	<496C3A80.5040007@delphij.net>
	<20090113232658.E31712@delplex.bde.org>
	<20090114005432.Y31765@delplex.bde.org>
In-Reply-To: <20090114005432.Y31765@delplex.bde.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no>, d@delphij.net,
	freebsd-arch@freebsd.org
Subject: Re: RFC: MI strlen()
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 13 Jan 2009 18:31:50 -0000


> 
> I reran the test.  I had to change -O2 to -O to test builtin strlen,
> and made some other changes in a failed attempt to force __builtin_strlen
> with -O2).  builtin strlen is much slower than I remembered.  The
> NetBSD asm strlen (it uses the 0x8080 trick with 64-bit words) is
> about 4.5 faster for long strings but slower for short strings (ones
> shorter than the word size).  I expect your C version is similar.

any chance you could try this and make a suggestion as to whether we 
might adopt the new code?

>