Autoincrement patches

[Michael Hayes]

Joern Rennecke writes:
 > Hmmm, I just recognize that PRE_MODIFY / POST_MODIFY is more complicated
 > than I thought - you have to pass it a complete SET_SRC.
 > Is there any indication that we'll really need that much flexibility?
 > Or could we just include the offset by which the register is incremented?

Ideally yes.  When I designed the functionality for
PRE_MODIFY/POST_MODIFY I wanted to be able to handle other esoteric
addressing modes used by DSPs, such as for creating circular buffers
and bit-reversed addressing.  

Michael.