not-a-number's

[Mischa Baars]

On 01/15/2013 05:24 PM, Eric Botcazou wrote:
>> When disregarding the 'isnan()', the function is returning a '2' when
>> one or both the arguments is a NaN. Do you suppose this is correct?
>>
>> If you ask me, it should exit on the first compare and thus return a
>> not-a-number.
> You cannot "exit" a comparison in C, one of the branches is always taken,
> which means that npx_dr11_inverse_tangent_series can never return -NAN.
>
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.