[libre-riscv-dev] [Bug 173] dynamic partitioned "shift"

bugzilla-daemon at libre-riscv.org bugzilla-daemon at libre-riscv.org
Thu Feb 13 18:17:07 GMT 2020


--- Comment #14 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Michael Nolan from comment #13)
> Looks like either a0faa5a or 6527ad39 made the problem slightly worse:
>    Number of wires:               8866
> the previous commit, bdca76073 had ~1k less gates:
>    Number of wires:               7893

we need to get rid of the switch statement.  we can't possibly have
a Mux-cascade of 64 Muxes, the gate latency will kill any possibility
of the chip running over about... 200 mhz.

i've just done the other three tables in
and the pattern is beginning to emerge.

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