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Yes, they are special, but this would be MORE special:
Date: Wed, 14 Jun 89 05:32:41 PDT
From: email@example.com (Scott Layson)
What I'd propose is different from the current Symbolics designs in
that there is no microcode
Sounds like the current Symbolics design to me (current = Ivory).
It's a highly-pipelined, NON-microcoded processor. There are a number
of RISCy ideas, although I don't think it would be considered a real
RISC processor. Many of the things that used to be done in ucode are
now done in macrocode, taking advantage of the pipelining. For
instance, BITBLT is now macrocoded. I think it still does generic
operations in hardware, rather than having a macrocoded tag-dispatch
instruction. This means that the common case of fixnum arithmetic
will be done in one cycle.