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Date: Fri, 1 Oct 2010 15:22:33 +0200
From: Roman Divacky <rdivacky@FreeBSD.org>
To: Jilles Tjoelker <jilles@FreeBSD.org>
Message-ID: <20101001132233.GA83116@freebsd.org>
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
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Subject: Re: svn commit: r213326 - head/lib/libc/i386/string
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On Fri, Oct 01, 2010 at 01:10:11PM +0000, Jilles Tjoelker wrote:
> Author: jilles
> Date: Fri Oct  1 13:10:11 2010
> New Revision: 213326
> URL: http://svn.freebsd.org/changeset/base/213326
> 
> Log:
>   libc: Remove the i386 assembler version of strlen(3).
>   
>   On anything modern, the C version, which processes a word at a time, is much
>   faster. The Intel optimization manual explicitly warns against using REP
>   prefixes with SCAS or CMPS, which is exactly what the assembler version
>   does.

there's "rep cmps" in bcmp.S and memcmp.S in both amd64/i386

they both have C counterparts, no idea how fast those are (they
are going char by char).

does this wisdom apply to those too?