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From: bean@putter.sgi.com (Bean Anderson)
Newsgroups: comp.arch
Subject: Re: Self-modifying code
Message-ID: <937@odin.SGI.COM>
Date: 12 Oct 89 20:23:17 GMT
References: <16557@siemens.siemens.com> <6481@pt.cs.cmu.edu> <9175@etana.tut.fi>
Sender: news@odin.SGI.COM
Reply-To: bean@putter.sgi.com (Bean Anderson)
Organization: Silicon Graphics, Inc.
Lines: 21

In article <16557@siemens.siemens.com>, fwb@demon.siemens.com (Frederic
W. Brehm) writes:
> In article <9175@etana.tut.fi> pl@etana.tut.fi (Lehtinen Pertti) writes:
> >	I've been lately wondering if there is any architecture
> >	with possibility to execute instruction indirectly.
> >...
> >	I mean something like:
> >
> >		exec r0	; execute instructio in register r0
> >...
> >	Does anyone know?
> 

The HP300  (a discontinued machine) had an execute-top-of-stack
instruction that got considerable use --
mostly because certain instructions that had immediate operands did not
have corresponding instructions
that had stack (or register) operands.   I think the HP3000 had a
similar instruction.

				Bean