[libre-riscv-dev] [Bug 305] Create Pipelined ALU similar to alu_hier.py

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=305

--- Comment #6 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
src/soc/alu/pipe_data.py

will need to pass in everything and pass out everything.  carry-in as
well as carry-out.

the pipelines have to take *everything* that they need to produce a
result: they are not permitted to access global resources such as
regfiles.

this is why we have different FunctionUnits with totally different
specs() because for Branch it will take CTR and LR *as input*, where
for ALU it will take CR0 and a and b and so on

and for the MUL FU it will take about *four* possibly 5 inputs:
RA RB RC (for MAC) *and* carry-in *and* CR0 etc. etc.

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