not-a-number's

[Mischa Baars]

On 01/16/2013 08:57 AM, Eric Botcazou wrote:
>> 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
>
Well, this is just a document of another teacher, this is not the Intel 
manual. Please read the other mail for me with the output of the 'ftst' 
instruction.