+LiveInterval &
+LiveStacks::getOrCreateInterval(int Slot, const TargetRegisterClass *RC) {
+ assert(Slot >= 0 && "Spill slot indice must be >= 0");
+ SS2IntervalMap::iterator I = S2IMap.find(Slot);
+ if (I == S2IMap.end()) {
+ I = S2IMap.emplace(std::piecewise_construct, std::forward_as_tuple(Slot),
+ std::forward_as_tuple(
+ TargetRegisterInfo::index2StackSlot(Slot), 0.0F))
+ .first;
+ S2RCMap.insert(std::make_pair(Slot, RC));
+ } else {
+ // Use the largest common subclass register class.
+ const TargetRegisterClass *OldRC = S2RCMap[Slot];
+ S2RCMap[Slot] = TRI->getCommonSubClass(OldRC, RC);
+ }
+ return I->second;
+}
+