patch: alpha haifa abort

[Jeffrey A Law]

  In message < 199801042302.SAA24792@jfc. >you write:
  > 
  > > As an asside, anyone know of a way I might be able to protect
  > > asm blocks from interblock scheduling?  Not critical, but it
  > > would happen to be better in this case.
  > 
  > Don't think small.  What you really want in this case is a gcc extension
  > to handle byte swapping.  I know the Linux hackers will be upset at a lost
  > chance to use gcc's asm extension, but it's a feature I've wanted for
  > years.
There was talk a few years ago about adding it as a builtin.  I don't see a 
reason why we couldn't add some byte swapping support.

  > Most of it isn't hard to implement; one tricky problem is reload.  Reload
  > assumes that it is always good to move a value into a register.  POWER and
  > SPARC v9 have byte-swapping load instructions but no corresponding
  > register-register operations.  These instructions also have limited
  > addressing.
Yes, this aspect of reload is problematical.

jeff