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Article: 10469 of rec.games.corewar
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From: iltzu@sci.fi (Ilmari Karonen)
Newsgroups: rec.games.corewar
Subject: Re: Impish little problem
Date: 28 Jul 1999 17:45:24 GMT
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On Tue, 27 Jul 1999 20:52:26 -0800, cgbean@alaska.net wrote:
: Hiya!  =(, My knowledge on the more modern imps is lacking, and I was
: wondering if anyone could improve the attached imp, without increasing
: its size too much.  Also, if there are any Core Warriors I'm missing,

Hmm.. my imp launchers have usually concentrated on minimizing the launch
code size, and I think this is a situation where I could help you. It
seems you're vector launching an 8-process 7-point spiral, right?

(Oops, just noticed you used a 3-point spiral. Well, the comments show
how to modify it.)

Now quite a few months ago I came up with a clever way to build
potentially huge imp spirals by combining several spirals like yours.
It's technically a JMP/ADD launch, but it shares some features, such as
the use of parallel processes, with vector launches.

I've named it the Vortex launch, and haven't so far come up with a decent
warrior to use it in. (I don't play CW actively very much any more - too
much to do and not enough time.) Maybe you could use it, though. Its one
weakness is that it's nearly impossible to launch just *one* spiral with
it, you need self-splitting to make it work.

Anyway, here's the code. There are a lot of free A- and B-fields you could
use for various things, but I've tried to maximize clarity. In particular
note that you can get a free decrement stream by using ADD.F. (Disclaimer:
This code hasn't been anywhere near pmars. Bugs may exist.)

;redcode-94
;author Ilmari Karonen
;name Vortex Launch
;strategy Build 8 infinite interleaved imp spirals

	org split

split	spl	1
	spl	1
	spl	1		; delete this line for 3-point
vortex	spl	#0
	add.a	#1143, launch	; use #2667 for 3-point
launch	jmp	imp-1144	; use imp-2668 for 3-point

imp	mov.i	#1143, *0	; use #2667 for 3-point

	end

Of course there's no point in putting all your processes in imps, so you
either need to make sure your stone self-splits faster than the launch, or
bomb the SPL #0 at some point to terminate the imp.

-- 
 .    _, .. j u s t.  h o w l.i n g   i n  .t h e   n.i g h t .. ._,   .
,    )''        .       /\_    .     '     ,/\   .          ,    ``(  ,
_\__/ |__.'\._______,--;_'_`-.___,.______,/_,_`.__,-.__'__,/`-._,_| \____
 ,_f_)\. Ilmari Karonen  iltzu@sci.fi  http://www.sci.fi/~iltzu/  /(_|_,.