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Tue May 28 17:58:49 EDT 2013

Delays and loops don't mix

Trouble is that each line has to be allocated separately.  A simple
-load/-store inside a loop doesn't work.  Time to think a bit about
it.

Maybe it is better to put it in feedback/n?  Or have some magic
lifting for state inputs that preform delay operations.  That will
probably be best.

Delays can be added in the second pass: at that time, it is clear what
the size of the loop is.  Alternatively, they can be special-cased in
store.

Well... as it is currently implemented, this can't work unless the
delay offsets are stored in a vector.

Looks like the first thing to make work is constant vectors.

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