not-a-number's

[Eric Botcazou]

> 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.

-- 
Eric Botcazou