[MLton-devel] datatype variant tag optimization

[Stephen Weeks]

A post from Xavier Leroy on comp.lang.ml yesterday pointed out an
optimization that is done in OCaml that we could do in MLton -- for
datatypes with multiple value-carrying variants we could keep the
variant tag in the header instead of using a word in the object.  This
fits in nicely with the header word type index scheme that I installed
over the summer, and would save a word per object.

MLton has lots of syntax trees, so this could be a pretty common
case.  There is a time performance hit due to an extra fetch to get
the tag.


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