Optimizer questions/issues with EBCDIC i370/s390 modes.

[David Edelsohn]

>>>>> Dave Pitts writes:

Dave> The s390 mode doesn't have any longlong.h entries.  I'll have to think 
Dave> about this one.
Dave> Any idea who wrote these macros? They may have some insight.

	Maybe Kenner or Marist or MKS or whoever did the original i370
port.  I would not look to the original author for help.

	Inline asm is very similar to the MD file patterns.  I didn't mean
look at longlong.h for S/390, I meant look at s390.md and i370.md to see
how they handled the "MR" multiply instruction constraints.

	Maybe it just needs "d" DATA_REGS constraints instead of "r"?

David