Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!pyramid!nsc!csi!jwhitnel
From: jwhitnel@csi.UUCP (Jerry Whitnell)
Newsgroups: comp.sys.mac.programmer
Subject: Re: (Very) Long Multiplies
Message-ID: <1453@csib.csi.UUCP>
Date: 18 Mar 88 19:37:59 GMT
References: <11318@duke.cs.duke.edu>
Reply-To: jwhitnel@csib.UUCP (Jerry Whitnell)
Organization: Communications Solutions Inc., San Jose, Ca
Lines: 31
Keywords: 32 * 32 bit multiply on 68020?

In article <11318@duke.cs.duke.edu> gleicher@duke.cs.duke.edu (Michael Gleicher) writes:
>Is there a neat way of doing this?
>Does the 68020 have a 32 bit multiply that produces a 64 bit
>	result?
Yes it does.

>if so, how can i put it into a lightspeed C program?
You pull out your handy-dandy 68020 manual, hand-assemble it and write
the machine code into your program.  No :-), I had to do this.  LSC
doesn't support (in version 2.15) 68020 assembly code, I think 3.0
will however.  So, for example, if the long multiply assembles
to 0x1234 0x5678 (it doesn't) you can add

    asm {
	0x1234		; First word of mul long
	0x5678		; second word of mul long
    }

and LSC will insert the above words into your code.
>
>Thanks,
>
>Mike
>
>Michael Lee Gleicher			(-: If it looks like I'm wandering
>	Duke University			(-:    around like I'm lost . . .
>E-Mail: gleicher@cs.duke.edu)(or uucp	(-:
>Or P.O.B. 5899 D.S., Durham, NC 27706	(-:   It's because I am!

Jerry Whitnell				Been through Hell?
Communication Solutions, Inc.		What did you bring back for me?
						- A. Brilliant