[Bug tree-optimization/21608] New: Repeated casts between bool and int are not optimized

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

Consider the testcase

static inline bool wrap(bool f) { return f; }
bool bar(bool f)
{
        return wrap(f);
}

we have in t67.optimized

  return (int) (bool) (int) (bool) (int) f;

and in t14.oplower

bool bar(bool) (f)
{
  int D.1592;
  bool f;
  bool D.1583;
  int D.1582;
  int D.1581;
  int D.1591;

<bb 0>:
  D.1582 = (int) f;
  f = (bool) D.1582;
  D.1592 = (int) f;
  D.1591 = D.1592;
  D.1583 = (bool) D.1591;
  D.1581 = (int) D.1583;
  return D.1581;

}

this load of SSA variables must pessimize or at least slow down something.

-- 
           Summary: Repeated casts between bool and int are not optimized
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21608