[Bug middle-end/35291] New: Missing DCE for union fields

[xinliangli at gmail dot com]

union U {
  struct C
   {
      char c[4];
   }cc;

   int ii;
} u ;

void foo(int i)
{
   u.cc.c[0] = 10; // Dead
   u.cc.c[1] = 10; // Dead too
   u.cc.c[i] = 10; // Dead too
   u.ii  = 20;
}


-- 
           Summary: Missing DCE for union fields
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: xinliangli at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35291