[Libre-soc-bugs] [Bug 458] PartitionedSignal needs nmigen constructs "m.If", Switch etc

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=458

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
taking a look at this more closely, i realised that Value (and UserValue) will
need some tweaks.
at present, the code does this:

class Value:
     def part(....)
         return Part(self, ...)

where Part is a global function.  in order to support override capability this
needs to change to:

class Value:
     def part(....)
         return ValuePart(self, ...)

where Part is defined as:

def Part(lhs, ....):
    return lhs.part(....)

and the *current* Part function is *renamed* to ValuePart.

UserValue then does:

class UserValue:
     def part(....)
         return UserValuePart(self, ...)

or more likely also calls ValuePart but it is clearly documented that
user-derived overrides are perfectly well permitted.

PartitionedSignal would do *exactly that*.

then, a crucial addition to Value and UserValue would be:

    def mux(self, choice1, choice2):
         return ValueMux(self, choice1, choice2)

and PartitionedSignal could override it to provide the correct dynamic SIMD
functionality.

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