[Bug tree-optimization/23603] New: VRP does not say range for a in a = b == c; is [0,1]

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

Example:
int f(int i)
{
  int t = i == 1;
  int g = t == 2;
  int h = g == 3;
  return h;
}
We should convert this to return 0 on the tree level but currently we get:
return i == 1 == 2 == 3;
in final_cleanup

-- 
           Summary: VRP does not say range for a in a = b == c; is [0,1]
           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=23603