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From: ka@hou3c.UUCP (Kenneth Almquist)
Newsgroups: net.unix-wizards
Subject: Re: Some hacks I'll share!
Message-ID: <407@hou3c.UUCP>
Date: Tue, 13-Mar-84 12:36:56 EST
Article-I.D.: hou3c.407
Posted: Tue Mar 13 12:36:56 1984
Date-Received: Wed, 14-Mar-84 08:15:38 EST
References: <98@isrnix.UUCP>
Organization: Bell Labs, Holmdel, NJ
Lines: 7

Another way to clear memory fast on PDP-11 machines is to use the mov
instruction instead of the clear instruction.  The clr instruction
performs a read, modify, write sequence on all the PDP-11 machines that
I have looked at.  Reading from a register is faster than reading from
memory, so if you have a spare register you can zero it, and then replace
the clr instructions in the loop with moves from the register.
					Kenneth Almquist