How to clean up i386 machine description?

[Jeffrey A Law]

  In message < 19981028093542.49463@horac.ta.jcu.cz >you write:
  > But for example how can I write attribute condition testing whether
  > input constant is 0x123 or so?
It is possible to examine the operands and the insn itself in the attribute
code.  However, doing so can get rather complicated.

If you're testing for a nice range of values it may be better to use a
constraint to drive attribute selection.  

jeff