TDB_SCE
td->td_dbgflags &= ~(TDB_SCE | TDB_BOUNDARY | TDB_SET_SC_RET);
td->td_dbgflags |= TDB_SCE;
if (((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 &&
if ((td2->td_dbgflags & TDB_SCE) == 0
if (td2->td_dbgflags & TDB_SCE)