[Bug tree-optimization/30104] New: missed code motion optimization (invariant control structures)

[dann at godzilla dot ics dot uci dot edu]

The following 2 functions should be compiled to the same assembly. 
This is one of Briggs' compiler benchmarks.

void motion_test10(int *data)
{
  int j;
  int p = data[1];
  int i = data[0];
  do {
    if (p)
      j = 1;
    else
      j = 2;
    i = i + j;
    data[data[2]] = 2;
  } while (i < data[3]);
}
void motion_result10(int *data)
{
  int j;
  int p = data[1];
  int i = data[0];
  if (p)
    j = 1;
  else
    j = 2;
  do {
    i = i + j;
    data[data[2]] = 2;
  } while (i < data[3]);
}


-- 
           Summary: missed code motion optimization (invariant control
                    structures)
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dann at godzilla dot ics dot uci dot edu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30104