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

[bugzilla-daemon at libre-riscv.org]

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

--- Comment #2 from Jock Tanner <tanner.of.kha at gmail.com> ---
Another thing that is slightly bugging me here is lookahead carry units. 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.

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