[libre-riscv-dev] need help with auto-pipeline stage creation

[Jacob Lifshay]

glad you got it to work!

On Wed, Apr 3, 2019, 20:33 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

> i got it... holy cow was it complicated.
>
> i found that modifying nmigen to prepend the unique ID (DUID - see
> hdl/ast.py) to the auto-generated name, such that it showed up in the
> graphviz, plus an awful, awful lot of debug print statements,
> eventually allowed me to get there in an extremely haphazard way.
>
> so, FINALLY... after several days of messing about... we have an
> auto-stage system for creating pipelines, and can do things like this:
>
>             with pipe.Stage("second", p) as (p, m):
>                 o = ObjectProxy(None, pipemode=False)
>                 o.d = p.o.b + Const(5)
>                 p.n = p.o.a
>                 p.o = o
>
> where the assignments are *automatically* added to a *nmigen module*
> that is managed by an UnbufferedPipeline object, with valid/ready
> management and synchronised data transfer.
>
> it is *NOT* even necessary to know that the UnbufferedPipeline object
> is being used!
>
> pretty awesome and very very close to what's *already* in the fmul.py
> code, for example, aleksander.
>
> l.
>
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