[Bug tree-optimization/54937] New: Invalid loop bound estimate

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54937

             Bug #: 54937
           Summary: Invalid loop bound estimate
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hubicka@gcc.gnu.org


The following loop gets predicted incorrectly to have 0 iterations while, it
iterates once.

void exit (int);
void abort (void);
int a[1];
void (*terminate_me)(int);

__attribute__((noinline,noclone))
t(int c)
{ int i;
  for (i=0;i<c;i++)
    {
      if (i)
       terminate_me(0);
      a[i]=0;
    }
}
main()
{
  terminate_me = exit;
  t(100);
  abort();
}