Article View: comp.sys.intel
Article #1636Re: I80386 String Operations
From: bobc Robert Cain
Date: Sat, 25 Jul 1987 04:46
Date: Sat, 25 Jul 1987 04:46
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In article <917@sauron.Columbia.NCR.COM>, campbell@sauron.Columbia.NCR.COM (Mark Campbell) writes:
> Could someone out there explain or point to literature explaining the I80386
> in a string compare loop appears to be much faster than the corresponding
> MC68020 load and compare instructions, even if the MC68020 can access memory
> more quickly in all (byte, word, and longword) normal cases?
>
> Mark Campbell
> {}!ncsu!ncrcae!sauron!campbell
Its all qutie simple. I am suprised you hadnt figured it out by now.
The reason that the I386 is so much faster at moving stings is because it
makes it cant add 32 bits correctly. If the damn thing couldnt atleast
move bytes, no one would even consider using it for anything but a place
to store gold and silicon until needed in a more useful device.
..!dlb!Eridani!LBI!bobc
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!rutgers!labrea!decwrl!sun!imagen!auspyr!!bobc From: bobc@.UUCP (Robert Cain) Newsgroups: comp.sys.intel Subject: Re: I80386 String Operations Message-ID: <23@.UUCP> Date: Sat, 25-Jul-87 00:46:37 EDT Article-I.D.: .23 Posted: Sat Jul 25 00:46:37 1987 Date-Received: Sun, 26-Jul-87 21:45:04 EDT References: <917@sauron.Columbia.NCR.COM> Organization: LBI, San Jose, CA. Lines: 16 Keywords: Performance, I80386, Strings, Characters Summary: M68020