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From: apratt@iuvax.UUCP
Newsgroups: net.lang
Subject: Re: Re: Self-modifying code and CDC Fort - (nf)
Message-ID: <1375@pur-ee.UUCP>
Date: Fri, 13-Jan-84 07:39:44 EST
Article-I.D.: pur-ee.1375
Posted: Fri Jan 13 07:39:44 1984
Date-Received: Sat, 14-Jan-84 03:28:44 EST
Sender: notes@pur-ee.UUCP
Organization: Electrical Engineering Department , Purdue University
Lines: 12

#R:azure:-248800:iuvax:11800010:000:472
iuvax!apratt    Jan 12 20:59:00 1984

You better believe there were some COMPASS hacks (CDC assembly code) who took
advantage of the "bug" you mention -- once a word is in cache, you can modify
it.  It would be just like one fellow I know to do that. His loops always
(well, almost always) fit in 15 words (I think that was the number), and he
never wasted the 15 bits which a jump instruction at the beginning of a word
wastes. Talk about slick, tight code!			-- Allan Pratt
					...ihnp4!inuxc!iuvax!apratt