[libre-riscv-dev] [Bug 132] SIMD-like nmigen signal for partitioning

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=132

--- Comment #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #11)

> > 
> > If the code is not doing single cycle results we cannot use it.
> 
> yes we can, we just need to tell the pipeline API "this takes 3 stages
> instead of one, so insert extra registers on the control signals"

Which still does not take care of cancellation.

The multiplier code will now need to implement cancellation, which is a global
mask (not a register-propagated signal).

Have a look at MaskCancellable.

The predicate mask (which is register based) and the stop mask (which is global
per pipe) are opaque to the (combinatorial) Stage API.

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