[Bug math/13873] New: pow (DBL_MAX, DBL_MAX) does not raise overflow exception

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13873

             Bug #: 13873
           Summary: pow (DBL_MAX, DBL_MAX) does not raise overflow
                    exception
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


On x86_64, pow (DBL_MAX, DBL_MAX) does not raise the overflow exception.  (This
appears to be distinct from the various other open pow bugs).  Testcase:

#include <errno.h>
#include <fenv.h>
#include <math.h>
#include <stdio.h>
#include <float.h>

volatile double d1 = DBL_MAX, d2 = DBL_MAX;

int
main (void)
{
  feclearexcept (FE_ALL_EXCEPT);
  errno = 0;
  volatile double r = pow (d1, d2);
  if (fetestexcept (FE_DIVBYZERO))
    printf ("DIVBYZERO ");
  if (fetestexcept (FE_INEXACT))
    printf ("INEXACT ");
  if (fetestexcept (FE_INVALID))
    printf ("INVALID ");
  if (fetestexcept (FE_OVERFLOW))
    printf ("OVERFLOW ");
  if (fetestexcept (FE_UNDERFLOW))
    printf ("UNDERFLOW ");
  printf ("%.18g %m\n", r);
  return 0;
}

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