[m-dev.] lcmc for high-level data

[Peter Wang]

I'm considering how to make the lcmc optimisation work for the Java
backend (and high-level data generally).  It is incompatible because it
relies on being able to take the address of a field, and then assigning
a value into an arbitrary memory address in the variant procedure.[1]

How difficult would it be to change the transformation so that instead
of passing the address of a field, pass the address of the entire cell,
and rely on the variant procedure to know which field needs to be
assigned?

Peter

[1] That could possibly be emulated using the Java reflection API, but
that would probably be slow.
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