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From: dillon@CORY.BERKELEY.EDU.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: 68k word-alignment penalty?
Message-ID: <8703242118.AA05186@cory.Berkeley.EDU>
Date: Tue, 24-Mar-87 16:18:33 EST
Article-I.D.: cory.8703242118.AA05186
Posted: Tue Mar 24 16:18:33 1987
Date-Received: Thu, 26-Mar-87 06:20:36 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 17

>	Some system software designers, in their shorsightedness, fail to
>provide even this basic exception handler in the OS.  Thus, the execution
>time for an odd-address word fetch on such a system increases by several
>orders of magnitude; from tens of seconds to almost forever.  Some
>particularly snobbish OS designers are presumptuous enough to assume that
>such code is in error, and design the exception handler to stop your program
>dead in its tracks.  As anyone can see, this is clearly The Wrong Thing.

	Excuse me, did I hear you say 'basic'?  This 'basic' exception handler
of yours would have to fully decode the instruction in question (assuming 
68000), skip the part before the exception occured, and manually simulate the
remainder.  And your saying "designers, in their shortsightedness"?

	Get A Life!   Nobody in their right mind does an odd-address word
fetch on a 68000 on purpose!

					-Matt