[Bug math/13879] New: powl (0.0, -LDBL_MAX) raises spurious overflow exception

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13879

             Bug #: 13879
           Summary: powl (0.0, -LDBL_MAX) raises spurious 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 both x86 and x86_64, powl (0.0, -LDBL_MAX) raises a spurious overflow
exception (likewise with -0.0).  Testcase:

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

volatile long double d1 = 0.0, d2 = -LDBL_MAX;

int
main (void)
{
  feclearexcept (FE_ALL_EXCEPT);
  errno = 0;
  volatile long double r = powl (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 ("%.18Lg %m\n", r);
  return 0;
}

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