[Bug middle-end/48760] [4.6 / 4.7 Regression (?)] std::complex constructor buggy in the face of NaN's

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48760

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jsm28 at gcc dot gnu.org
          Component|libstdc++                   |middle-end
            Summary|std::complex constructor    |[4.6 / 4.7 Regression (?)]
                   |buggy in the face of NaN's  |std::complex constructor
                   |                            |buggy in the face of NaN's
           Severity|blocker                     |normal

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-04-25 
12:07:44 UTC ---
I don't think this is a library proper issue, how can it be? We have just:

      constexpr // In C++0x mode
      complex(float __r = 0.0f, float __i = 0.0f)
      : _M_value(__r + __i * 1.0fi) { }

where _M_value is a __complex__ float. Joseph, can you have a look? By the way,
what is reported did *not* happen in 4.5.x and nothing changed in the lib in
this area in the meanwhile (besides the C++0x bits, not at issue here).

Note a complete C++ snippet would be:

#include <complex>
#include <limits>
#include <iostream>

int main()
{
  std::complex<float> c(0, std::numeric_limits<float>::quiet_NaN());

  std::cout << c << std::endl;
}