Better handling for multi-word values?

[Jeffrey A Law]

  In message < Pine.GSO.4.02A.9809041248120.19368-100000@matlock.informatik.rwth-aachen.de >you write:

  > My question is now, what could be done about it?  I've played with the comp iler
  > a bit yesterday and came up with a half-done patch (which I won't post here,
  > since it doesn't work properly yet; I can send it on request).  I'll describe
  > what I did so that people can comment on whether they think it's a good
  > starting point or not.
  > 
  > I added a new rtx code, MULTIWORD, which represents a value that consists of
  > multiple word-sized parts.  The idea is that instead of a DImode pseudo, two
  > SImode pseudos are allocated and put inside of a MULTIWORD:
This sounds very similar to the half-finished CONCAT stuff already
in the compiler.....

jeff