[Bug tree-optimization/21458] New: VRP does not remove a conditional in a loop

["kazu at cs dot umass dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

Consider

extern void g (void);
extern void bar (int);

int
foo (int a)
{
  int i;

  for (i = 1; i < 100; i++)
    {
      if (i)
	g ();
    }

  /* Force VRP to run.  */
  if (a)
    bar (a);
}

VRP does not remove the first "if" statement.

-- 
           Summary: VRP does not remove a conditional in a loop
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kazu at cs dot umass dot edu
                CC: dnovillo at redhat dot com,gcc-bugs at gcc dot gnu dot
                    org,steven at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21458