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From: page@ulowell.UUCP (Bob Page)
Newsgroups: comp.sys.amiga
Subject: Re: More bugs... (fixed in V3.30e)
Message-ID: <836@ulowell.UUCP>
Date: Mon, 8-Dec-86 23:42:26 EST
Article-I.D.: ulowell.836
Posted: Mon Dec  8 23:42:26 1986
Date-Received: Wed, 10-Dec-86 03:32:16 EST
References: <723@watmum.UUCP>
Reply-To: page@ulowell.UUCP (Bob Page)
Distribution: net
Organization: University of Lowell
Lines: 58

rmariani@watmum.UUCP (Rico Mariani) wrote in article <723@watmum.UUCP>:
some INCREDIBLY horrible C code.  Rico, where the hell do you get such
ugly code?  Anyway, on with our regularly scheduled article:

>main()
>{
>	int  box[1], i;
>
>	(box+i)[0] =
>	(box+i)[0] =
>	(box+i)[0] =
>	(box+i*i)[0] = 0;
>}

The Manx V3.30e (beta version) compiler and assembler like this code.
Witness the difference between V3.20a and V3.30e (please excuse any
little typos; I'm typing this in by hand):

	Old (V3.20a) code:	New (V3.30e) code:
	-----------------	-----------------
	move.l	-8(a5),d3	move.l	-8(a5),d1
	asl.l	#2,d3		move.l	-8(a5),d0
				jsr	.mulu#
	lea	-4(a5),a6
	move.l	-8(a5),d2
	asl.l	#2,d2		asl.l	#2,d0
	lea	-4(a5),a1	lea	-4(a5),a0
				clr.l	(a0,d0.l)
	move.l	-8(a5),d1	move.l	-8(a5),d2
	asl.l	#2,d1		asl.l	#2,d2
	lea	-4(a5),a0	lea	-4(a5),a1
				clr.l	(a1,d2.l)
	move.l	-8(a5),d0	move.l	-8(a5),d3
	move.l	d1,-(sp)
	move.l	-8(a5),d1
	jsr	.mulu#
	asl.l	#2,d0		asl.l	#2,d3
	move.l	a6,-(sp)
	lea	-4(a5),a6	lea	-4(a5),a6
	clr.l	(a6,d0.l)	clr.l	(a6,d3.l)
	clr.l	(a0,.l)
	clr.l	(a1,d2.l)
	move.l	(sp)+,a6
	move.l	(sp)+,d1
				move.l	-8(a5),d3
				asl.l	#2,d3
				lea	-4(a5),a6
	clr.l	(a6,d3.l)	clr.l	(a6,d3.l)

The new Manx compiler (at least the beta version) is producing much
tighter code these days.  And in this case, better code too.  We've
seen some problems with the libraries (some types that should be
16-bit values are in the libraries as 32-bit values), but the
compiler itself seems to be doing pretty well.

..Bob	(beta testing the Manx compiler, if you hadn't guessed)
-- 
Bob Page,  U of Lowell CS Dept.      ulowell!page,  page@ulowell.CSNET