[Bug tree-optimization/33145] New: Should combine float/int conversion and rounding functions

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

long
foo (int i)
{
  float x;
  x = i;
  return __builtin_lroundf (x);
}

and

long
foo (int i)
{
  return __builtin_lroundf ((float)i);
}

should generate the same code.  The former is before expansion

  return __builtin_lroundf ((float) i);

which is unfolded while the latter is

  return (long int) (float) i;


This has to be addressed in a tree-combiner.


-- 
           Summary: Should combine float/int conversion and rounding
                    functions
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33145