Bug in gmp/mpfr/mpc, never ending ctan computation

[Dennis Clarke]

On 11/19/18 4:59 AM, Torbjörn Granlund wrote:
> [moved from gmp-devel]
> 
> 
> Richard Biener <rguenther at suse.de> writes:
> 
>    For
>>
>    #include <complex.h>
>>
>    int main()
>    {
>      _Complex double x;
>      __real x = 3.09126495087690770626068115234375e+8;
>      __imag x = -4.045689747817175388336181640625e+8;
>      volatile _Complex double y = ctan (x);
>      return 0;
>    }
> 

Unrelated but interesting none the less, even Wolfram Alpha seems to
have troubles :

https://www.wolframalpha.com/input/?i=tan+(+3091264.95087690770626068115234375+-+4045689.747817175388336181640625i+)

That is with the test data divided by ten. Use the actual test data and
the output simply is blank. Interesting.

Dennis