Hi Richard,

Do you really need peepholes for this?  I would have thought that
merely adding the instruction patterns for this would have been
enough to encourage combine to do its job merging these patterns...
I thought so too, but I found in my tests that combine was missing 
plenty of cases where the optimization could take place.  Hence I added 
the peepholes.  (I admit that I did not delve deeply into *why* combine 
was not using my instruction pattens, I just found that the peepholes 
worked).  Plus I reasoned that the peepholes could not hurt...
Cheers
  Nick


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