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Date: Fri, 10 Dec 2010 22:17:27 +0100
From: Joerg Sonnenberger <joerg@britannica.bec.de>
To: tech@mdocml.bsd.lv
Subject: Re: roff.c question
Message-ID: <20101210211727.GA30572@britannica.bec.de>
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On Fri, Dec 10, 2010 at 10:10:20PM +0100, Ingo Schwarze wrote:
> Hi Joerg,
> 
> Joerg Sonnenberger wrote on Fri, Dec 10, 2010 at 09:52:03PM +0100:
> > On Fri, Dec 10, 2010 at 09:45:13PM +0100, Ingo Schwarze wrote:
> 
> >> If we want to go into micro-optimization, we could do this:
> >> 
> >>         for (cp = *bufp + pos; *cp; cp++) {
> >>                 if ('\\' != *cp)
> >>                         continue;
> 
> > ... or use a single strchr() call to start the search.
> 
> Sure, that would be correct, and not even obfuscation.
> 
> > For the typical case of medium long lines and no \, strchr
> > can operate mostly on dwords...
> 
> Here is our implementation of strchr():

If "our" you mean OpenBSD, it is not the version in libc on most
platforms, which is in assembler. But yes, the OpenBSD version e.g. for
i386 is pretty stupid.

Joerg
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