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Unrolling NTHCDR

Yes, the winnitude of the compiled version, which merely unrolls
4 cdrs at a time by doing JSP T, %CDDDDR  seems to say that
the more complicated unrollings aren't worth it.  Most likely this
is due to the relatively small loop overhead, and the fact
that the cache misses are most certainly concentrated in the data
rather than the program (well, how fast can one randomly cdr down
a list anyway?)