149   BlockInterference *BI = &Blocks[MBBNum];  in update()  local
153     BI->Tag = Tag;  in update()
154     BI->First = BI->Last = SlotIndex();  in update()
164       if (!BI->First.isValid() || StartI < BI->First)  in update()
165         BI->First = StartI;  in update()
177       if (!BI->First.isValid() || StartI < BI->First)  in update()
178         BI->First = StartI;  in update()
184     SlotIndex Limit = BI->First.isValid() ? BI->First : Stop;  in update()
189         BI->First = RegMaskSlots[i];  in update()
194     if (BI->First.isValid())  in update()
201     BI = &Blocks[MBBNum];  in update()
202     if (BI->Tag == Tag)  in update()
217     if (!BI->Last.isValid() || StopI > BI->Last)  in update()
218       BI->Last = StopI;  in update()
234     if (!BI->Last.isValid() || StopI > BI->Last)  in update()
235       BI->Last = StopI;  in update()
241   SlotIndex Limit = BI->Last.isValid() ? BI->Last : Start;  in update()
247       BI->Last = RegMaskSlots[i-1].getDeadSlot();  in update()