[GTALUG] example of why RISC was a good idea
James Knott
james.knott at rogers.com
Sat May 21 14:48:50 EDT 2016
On 05/21/2016 01:33 PM, D. Hugh Redelmeier wrote:
> A RISC processor would not have a complex instruction decoder so this kind
> of hacking would not apply. I will admit that there are "hazards" in RISC
> processors that are worth paying attention to when selecting and ordering
> instructions but these tend to be clearer.
Many years ago, I used to maintain Data General Eclipse systems. The
CPU used microcode to control AMD bit slice processors and associated
logic. The microcode instructions were over 100 bits wide. Now
*THAT'S* RISC. ;-)
BTW, those CPUs had an option called Writable Control Store (WCS) where
one could create custom instructions.
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