1148   OS << " updater with gap = " << (ReadI - WriteI)  in print()
1157   for (const auto &S : make_range(ReadI, LR->end()))  in print()
1195     WriteI = ReadI = LR->begin();  in add()
1203   if (ReadI != E && ReadI->end <= Seg.start) {  in add()
1205     if (ReadI != WriteI)  in add()
1208     if (ReadI == WriteI)  in add()
1209       ReadI = WriteI = LR->find(Seg.start);  in add()
1211       while (ReadI != E && ReadI->end <= Seg.start)  in add()
1212         *WriteI++ = *ReadI++;  in add()
1215   assert(ReadI == E || ReadI->end > Seg.start);  in add()
1218   if (ReadI != E && ReadI->start <= Seg.start) {  in add()
1219     assert(ReadI->valno == Seg.valno && "Cannot overlap different values");  in add()
1221     if (ReadI->end >= Seg.end)  in add()
1224     Seg.start = ReadI->start;  in add()
1225     ++ReadI;  in add()
1229   while (ReadI != E && coalescable(Seg, *ReadI)) {  in add()
1230     Seg.end = std::max(Seg.end, ReadI->end);  in add()
1231     ++ReadI;  in add()
1248   if (WriteI != ReadI) {  in add()
1256     WriteI = ReadI = LR->end();  in add()
1265   size_t GapSize = ReadI - WriteI;  in mergeSpills()
1296     LR->segments.erase(WriteI, ReadI);  in flush()
1302   size_t GapSize = ReadI - WriteI;  in flush()
1306     LR->segments.insert(ReadI, Spills.size() - GapSize, LiveRange::Segment());  in flush()
1311     LR->segments.erase(WriteI + Spills.size(), ReadI);  in flush()
1313   ReadI = WriteI + Spills.size();  in flush()