[Bug tree-optimization/27039] New: Unable to determine # of iterations for a simple loop

[rakdver at gcc dot gnu dot org]

With the fix for PR 26763, we are unable to determine # of iterations of the
following loop, more precisely, we are unable to determine that it rolls -- for
that, we would need to fold p_4 + 4B > p_4 + 8B.

int foo (int *p)
{
  int i = 0, *x;

  for (x = p; x < p + 2; x++)
    i++;

  return i;
}


-- 
           Summary: Unable to determine # of iterations for a simple loop
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rakdver at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27039