not-a-number's

[Eric Botcazou]

> Well, I have an Intel manual here that states that any operation on a
> QNaN should return a QNaN, which means that also the compare should
> return a QNaN when one or both of the arguments is a QNaN.

No, that isn't how comparisons work.  The correct result is 2 according to the 
comparison rules of IEEE-754.  I'd suggest reading page 8 of "Lecture Notes on 
the Status of IEEE 754" by Kahan:
  http://www.cs.berkeley.edu/~wkahan/ieee754status/IEEE754.PDF

-- 
Eric Botcazou