[MLton-devel] cvs commit: using header words as variant tags

[Matthew Fluet]

>   One question about the native codegen: the variant tags for a
>   particular datatype will be consecutive integers, but not starting at
>   zero.  Is the codegen smart enough to do a subtract and make a jump
>   table?

Yes.  reduce  x86-generate-transfers: 1353  takes a case transfer and
computes minK, maxK, shift, and mask which are used to "normalize" the
transfer; it compensates for non-zero minK, tags that are all even or all
odd, and checks a density criteria.



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