that they *pass through* SIMD behaviour entirely to a lower level,
*completely intact*.
+Method (2) allows the Liskov Substitution Principle to be
+put to surprisingly good effect. If that was possible to
+achieve then **almost no modifications to nmigen would
+be required**.
+
Analysis of the internals of nmigen shows that m.If, m.Else, m.FSM and m.Switch are all redirected to ast.py `Switch`. Within that function Mux and other "global" functions (similar to python operator functions). The hypothesis is therefore proposed that if `Value.mux` is added in an identical way to how `operator.add` calls `__add__` this may turn out to be all that (or most of what) is needed.
<https://github.com/nmigen/nmigen/blob/59ef6e6a1c4e389a41148554f2dd492328820ecd/nmigen/hdl/dsl.py#L447>