Why can't CSE recognize const_int's in HIGH LO_SUM pair?

[law@redhat.com]

  In message < 200109241719.f8OHJdj1028320@hiauly1.hia.nrc.ca >you write:
  > > Another approach is to allow all constants in compare/branch insns initia
  > lly,
  > > then use define_splits and friends to lower to the actual capabilities of
  > > the chip later.
  > 
  > Ths could be the best approach but my first impression was that it
  > was likely more work to implement.
I could probably send you the stuff I was playing with (assuming that I can
still find it :-)

jeff