Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!necntc!ames!ucbcad!zen!ucbvax!ucdavis!uop!root
From: root@uop.UUCP (S. User)
Newsgroups: comp.sys.atari.st
Subject: Re: Mark Williams C: some findings...
Message-ID: <607@uop.UUCP>
Date: Sun, 11-Oct-87 22:41:15 EDT
Article-I.D.: uop.607
Posted: Sun Oct 11 22:41:15 1987
Date-Received: Sat, 17-Oct-87 08:23:14 EDT
References: <879@sask.UUCP>
Organization: University of the Pacific, Stockton, CA
Lines: 26
Summary: Read the manual



Well, the size isn't _really_ the compiler's fault.  Just a different
design methodology:  the Megamax produces PC-relative code and the Mark
Williams produces _real_ code.  That is why there is the 32k limitation
on Megamax programs.

To use variables in MWC, pass them as parameters.  Everything is passed
as a long word.  so
	func(v1,v2,v3,v4)
	char	v1;
	short	v2;
	int	v3,v4;

ends up like this on the stack:
	(sp)	Return Address from the jsr
	4(sp)	v1	(use move.b 4(sp), d0 or equiv)
	8(sp)	v2	(use move.w 8(sp), d0 or equiv)
	12(sp)	v3	etc
	16(sp)	v4	etc

If you use the link instruction (as in compiled C-code), then make sure you
allow for the address it'll push onto the stack and the instructions effects.


G. Onufer