[Bug tree-optimization/30978] New: Does not propagate comparison results

[rguenth at gcc dot gnu dot org]

int foo(int a)
{
  unsigned int b = a > 0;
  char c = b;
  return c;
}

is not optimized to

int foo(int a)
{
  return a > 0;
}

at the tree level.  Forwprop has code to do this if the final propagation
result is in a COND_EXPR.

I have a patch.


-- 
           Summary: Does not propagate comparison results
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, TREE
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: rguenth at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30978