Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!unmvax!bbx!bbxsda!scott
From: scott@bbxsda.UUCP (Scott Amspoker)
Newsgroups: comp.arch
Subject: Re: 680x0 instructions (was: '040 vs SPARC)
Message-ID: <616@bbxsda.UUCP>
Date: 12 Feb 90 21:57:50 GMT
References: <645@ssp11.idca.tds.philips.nl> <38554@apple.Apple.COM>
Reply-To: scott@bbxsda.UUCP (Scott Amspoker)
Organization: Basis International,  Albuquerque, NM
Lines: 17

In article <38554@apple.Apple.COM> baum@apple.UUCP (Allen Baum) writes:
>In article <604@bbxsda.UUCP> scott@bbxsda.UUCP (Scott Amspoker) writes:
>>structure accesses with pointers such as "pointer->field".  The
>>68020 double-indirect-with-offset addressing mode is a real life saver [...]
>
>A very waterlogged lifesaver. It is not clear that the fancy addressing
>modes run faster than a sequence of simpler insts., according to my sources.
>It is likely to get worse, rather than better, in future implementations

Agreed.  However, it think the debate was whether or not C compilers
actually use those fancy addressing modes.  The answer is, yes.

-- 
Scott Amspoker
Basis International, Albuquerque, NM
(505) 345-5232
unmvax.cs.unm.edu!bbx!bbxsda!scott