155   BlockInterference *BI = &Blocks[MBBNum];  in update()  local
159     BI->Tag = Tag;  in update()
160     BI->First = BI->Last = SlotIndex();  in update()
170       if (!BI->First.isValid() || StartI < BI->First)  in update()
171         BI->First = StartI;  in update()
183       if (!BI->First.isValid() || StartI < BI->First)  in update()
184         BI->First = StartI;  in update()
190     SlotIndex Limit = BI->First.isValid() ? BI->First : Stop;  in update()
195         BI->First = RegMaskSlots[i];  in update()
200     if (BI->First.isValid())  in update()
207     BI = &Blocks[MBBNum];  in update()
208     if (BI->Tag == Tag)  in update()
223     if (!BI->Last.isValid() || StopI > BI->Last)  in update()
224       BI->Last = StopI;  in update()
240     if (!BI->Last.isValid() || StopI > BI->Last)  in update()
241       BI->Last = StopI;  in update()
247   SlotIndex Limit = BI->Last.isValid() ? BI->Last : Start;  in update()
253       BI->Last = RegMaskSlots[i-1].getDeadSlot();  in update()