[Bug tree-optimization/22312] New: reassoc does not handle (i+j)+(k+l) well

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

take the following example:
int f(int i, int j, int k, int l)
{
  int r1 = (i+j)+(k+l);
  int r2 = (j+k)+(l+i);
  return r1 == r2;
}

This should return 1 all the time.  I found this while making testcases for reassoc working fp (well I just 
change one little thing to make it work really).

-- 
           Summary: reassoc does not handle (i+j)+(k+l) well
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22312