[Bug middle-end/17603] New: Cpowf and cpowl builtins broken

["pcarlini at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,

on some platforms, 26_numerics/complex/13450.cc has been failing for some time.
I tracked down the problem to the complex pow builtins. Just run (-O0 suffices)
the below:

#include <cassert>

// libstdc++/13450
int main()
{
  __complex__ long double x;
  __complex__ long double y;
  __complex__ long double z;
  __real__ x = -1.0l;
  __imag__ x = 0.0l;
  __real__ y = 0.5l;
  __imag__ y = 0.0l;
  z = __builtin_cpowl(x, y);
  assert( __imag__ z > 0.99l && __imag__ z < 1.01l);
}

Indeed, if I print z inside gdb:

$1 = <invalid float value> + 3.6451995318824746025284059336194198e-4951 * I

instead of the expected (3.4 is ok): ~0 + 1 * I.

Similar problems affect __builtin_cpowf, just let me know and I can prepare
a suited testcase. In any case, in order to double check that everything is
finally ok, just run the libstdc++ testsuite ;) ...

-- 
           Summary: Cpowf and cpowl builtins broken
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: middle-end
        AssignedTo: roger at eyesopen dot com
        ReportedBy: pcarlini at suse dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17603