1137   OS << " updater with gap = " << (ReadI - WriteI)  in print()
1146   for (const auto &S : make_range(ReadI, LR->end()))  in print()
1184     WriteI = ReadI = LR->begin();  in add()
1192   if (ReadI != E && ReadI->end <= Seg.start) {  in add()
1194     if (ReadI != WriteI)  in add()
1197     if (ReadI == WriteI)  in add()
1198       ReadI = WriteI = LR->find(Seg.start);  in add()
1200       while (ReadI != E && ReadI->end <= Seg.start)  in add()
1201         *WriteI++ = *ReadI++;  in add()
1204   assert(ReadI == E || ReadI->end > Seg.start);  in add()
1207   if (ReadI != E && ReadI->start <= Seg.start) {  in add()
1208     assert(ReadI->valno == Seg.valno && "Cannot overlap different values");  in add()
1210     if (ReadI->end >= Seg.end)  in add()
1213     Seg.start = ReadI->start;  in add()
1214     ++ReadI;  in add()
1218   while (ReadI != E && coalescable(Seg, *ReadI)) {  in add()
1219     Seg.end = std::max(Seg.end, ReadI->end);  in add()
1220     ++ReadI;  in add()
1237   if (WriteI != ReadI) {  in add()
1245     WriteI = ReadI = LR->end();  in add()
1254   size_t GapSize = ReadI - WriteI;  in mergeSpills()
1285     LR->segments.erase(WriteI, ReadI);  in flush()
1291   size_t GapSize = ReadI - WriteI;  in flush()
1295     LR->segments.insert(ReadI, Spills.size() - GapSize, LiveRange::Segment());  in flush()
1300     LR->segments.erase(WriteI + Spills.size(), ReadI);  in flush()
1302   ReadI = WriteI + Spills.size();  in flush()