+ // Register units are used to model interference and register pressure.
+ // Every register is assigned one or more register units such that two
+ // registers overlap if and only if they have a register unit in common.
+ //
+ // Normally, one register unit is created per leaf register. Non-leaf
+ // registers inherit the units of their sub-registers.
+ struct RegUnit {
+ // Weight assigned to this RegUnit for estimating register pressure.
+ // This is useful when equalizing weights in register classes with mixed
+ // register topologies.
+ unsigned Weight;
+
+ // Each native RegUnit corresponds to one or two root registers. The full
+ // set of registers containing this unit can be computed as the union of
+ // these two registers and their super-registers.
+ const CodeGenRegister *Roots[2];
+
+ // Index into RegClassUnitSets where we can find the list of UnitSets that
+ // contain this unit.
+ unsigned RegClassUnitSetsIdx;
+
+ RegUnit() : Weight(0), RegClassUnitSetsIdx(0) {
+ Roots[0] = Roots[1] = nullptr;
+ }
+
+ ArrayRef<const CodeGenRegister*> getRoots() const {
+ assert(!(Roots[1] && !Roots[0]) && "Invalid roots array");
+ return makeArrayRef(Roots, !!Roots[0] + !!Roots[1]);
+ }
+ };
+
+ // Each RegUnitSet is a sorted vector with a name.
+ struct RegUnitSet {
+ typedef std::vector<unsigned>::const_iterator iterator;
+
+ std::string Name;
+ std::vector<unsigned> Units;
+ unsigned Weight; // Cache the sum of all unit weights.
+ unsigned Order; // Cache the sort key.
+
+ RegUnitSet() : Weight(0), Order(0) {}
+ };
+
+ // Base vector for identifying TopoSigs. The contents uniquely identify a
+ // TopoSig, only computeSuperRegs needs to know how.
+ typedef SmallVector<unsigned, 16> TopoSigId;
+