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From: mac@uvacs.UUCP (Alex Colvin)
Newsgroups: net.arch
Subject: Re: Re: Addressing modes
Message-ID: <212@uvacs.UUCP>
Date: Sat, 22-Feb-86 12:01:15 EST
Article-I.D.: uvacs.212
Posted: Sat Feb 22 12:01:15 1986
Date-Received: Wed, 26-Feb-86 03:44:35 EST
References: <187@anwar.UUCP> <1441@gitpyr.UUCP>
Organization: U.Va. CS dept.  Charlottesville, VA
Lines: 9

> So, just set one (or two) bits of every instruction aside to make it
> possible to conditionally execute any instruction.  Is it worth the trouble
> to decode it?

Instead of using the bits, make it a(n optional) prefix to the instruction.
Then you've got a machine with conditionl skips instead of conditional
jumps.  See the PDP8, Nova, &c.