Hand-tuned strcmp, Was: SPECmark for 486PC

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Article #10900

#10900

From: Damon
Date: Mon, 14 Dec 1992 01:07

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In article <723248954.28138@minster.york.ac.uk> mjl-b@minster.york.ac.uk (Mathew Lodge) writes:
>On C compilers (remember Dhrstone was actually implemented in Ada, then
>converted) this means hand tuning strcmp() -- I have a 68K C compiler that
>generates a little hand-crafted in-line asssembly for this particular
>library call.

I had a program (the same one I ported to an HP-UX in 30 minutes
mentioned in a post earlier today) that *doubled* in speed when I wrote
the inlined version of strcmp().  Well, not quite strcmp(); it did the
subtraction comparison in longer integers or something.

The code was compiling rather fancy concordances.  Bet NSA has a similar
program...

Damon
-- 
Damon Hart-Davis                          Internet: dhd@exnet.co.uk, d@hd.org

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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!ibmpcug!exnet!dhd

References: <9211291618.43@rmkhome.UUCP> <GJR.92Nov30083125@chamarti.ai.mit.edu> <723248954.28138@minster.york.ac.uk>

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Newsgroups: comp.arch
Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!ibmpcug!exnet!dhd
From: dhd@exnet.co.uk (Damon)
Subject: Hand-tuned strcmp, Was: SPECmark for 486PC
Message-ID: <Bz85sA.BqE@exnet.co.uk>
Organization: ExNet Systems Ltd Public Access News, London, UK
References: <9211291618.43@rmkhome.UUCP> <GJR.92Nov30083125@chamarti.ai.mit.edu> <723248954.28138@minster.york.ac.uk>
Date: Mon, 14 Dec 1992 01:07:21 GMT
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