[Bug tree-optimization/26757] [4.1 regression] ICE (Segmentation fault) building 3ddesktop source

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

------- Comment #3 from pinskia at gcc dot gnu dot org  2006-03-19 20:36 -------
DCE is removing some statements:
Marking useful stmt: alarm (D.3630_3);

Marking useful stmt: return;


Processing worklist:
processing: return;

processing: alarm (D.3630_3);

processing: D.3630_3 = (unsigned int) D.3629_2;


Eliminating unnecessary statements:
Deleting : cfg.20_1 = cfg;

Deleting : D.3629_2 = cfg.20_1->autoacquire;

Removed 2 of 5 statements (40%)
Removed 0 of 0 PHI nodes (0%)
void acquire_desktop(int) (rv)
{
  unsigned int D.3630;
  int D.3629;
  struct Config * cfg.20;

<bb 0>:
  D.3630_3 = (unsigned int) D.3629_2;
  #   cfg_4 = V_MAY_DEF <cfg_2>;
  alarm (D.3630_3);
  return;

}

I don't understand why  (this is using a reduced version of the source) because
it is obvious it is used.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |blocker
          Component|c++                         |tree-optimization
      Known to fail|                            |4.0.2
      Known to work|                            |4.2.0
   Target Milestone|---                         |4.1.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26757