[libre-riscv-dev] [Bug 267] The efficiency of adder/subtractor

bugzilla-daemon at libre-riscv.org bugzilla-daemon at libre-riscv.org
Tue Apr 7 15:44:36 BST 2020


--- Comment #9 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jock Tanner from comment #6)
> The idea is so simple yet so out-of-the-box! I feel like I'm in a Western
> movie, while my partner is devising a get-rich-fast scheme:
> − And where's the catch?
> − There is no catch.

a lot of what we're doing is like that.  the 6600 scoreboards are *very*
badly misunderstood and drastically underestimated right across the
entire industry (thanks largely to Patterson's book on RISC architectures).

consequently what's in Thornton's book "Design of a Computer" (google it)
has had to be "reinvented" and often comes attached with unnecessary baggage
such as "register renamers".

then again there are areas where we are "functional" but need serious
improvement.  we need a Dadda multiplier algorithm for example, because
we currently have a Wallace Tree one.

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