🚀 go-pugleaf

In article <28842@winchester.mips.COM> mash@mips.COM (John Mashey) writes:
>In article <6429@ficc.uu.net> peter@ficc.uu.net (Peter da Silva) writes:
>>A philosophical digression:
...
>The Heisenberg analogy is not bad.  However, it has nothing to do
>with whether something is RISC or not.  It's much more likely to
>be related to a machine that is a) heavily pipelined, and especially if
>it b) does true out-of-order execution.  Neither of these are exclusive
>to RISCs.  Of course, typical RISC designs may make it easier to
>use deeper pipelining with less complexity of undoing/shadowing, etc.

	The RPM-40 has an interesting trick to avoid problems like this:
it keeps a "queue" of PC values (and a few other internal values).  This
makes restart easy (and it only takes 8 cycles to store all the queues).

-- 
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com  BIX: rjesup  
Common phrase heard at Amiga Devcon '89: "It's in there!"