[Bug tree-optimization/23384] New: Clobber list should be flow sensitive

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

Take the following code:
struct f
{
  int i;
  int j;
};
void g(void);
void i(struct f*);

int kk(void)
{
  struct f a;
  int j;
  a.i = 1;
  a.j =2 ;
  g();
  j = a.i;
  i(&a);
  return j;
}

---
j should be changed to 1 as the address of a is not escape until after the call to i so g should not get a 
call clobbered for the SFT's of a.

-- 
           Summary: Clobber list should be flow sensitive
           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=23384