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

[bugzilla-daemon@libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=267

--- Comment #3 from Luke Kenneth Casson Leighton <lkcl@lkcl.net> ---
(In reply to Jock Tanner from comment #2)

> Another thing that is slightly bugging me here is lookahead carry units.

you'll need to send me some links so i can take a look at what you mean.

> Should we reconfigure them "on the fly" together with adders/subtractors? Is
> that viable? Multiplexers can introduce enough delay to make the whole
> looking-ahead thing inefficient comparing to simple serial carry propagation.

if you can put some links here as to what you're comparing (descriptions,
tutorials, gate-level diagrams) i can get up to speed and follow the
conversation.

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