+
+ // A key representing the parts of a register class used for forming
+ // sub-classes. Note the ordering provided by this key is not the same as
+ // the topological order used for the EnumValues.
+ struct Key {
+ const CodeGenRegister::Set *Members;
+ unsigned SpillSize;
+ unsigned SpillAlignment;
+
+ Key(const Key &O)
+ : Members(O.Members),
+ SpillSize(O.SpillSize),
+ SpillAlignment(O.SpillAlignment) {}
+
+ Key(const CodeGenRegister::Set *M, unsigned S = 0, unsigned A = 0)
+ : Members(M), SpillSize(S), SpillAlignment(A) {}
+
+ Key(const CodeGenRegisterClass &RC)
+ : Members(&RC.getMembers()),
+ SpillSize(RC.SpillSize),
+ SpillAlignment(RC.SpillAlignment) {}
+
+ // Lexicographical order of (Members, SpillSize, SpillAlignment).
+ bool operator<(const Key&) const;
+ };
+
+ // Create a non-user defined register class.
+ CodeGenRegisterClass(CodeGenRegBank&, StringRef Name, Key Props);
+
+ // Called by CodeGenRegBank::CodeGenRegBank().
+ static void computeSubClasses(CodeGenRegBank&);
+ };
+
+ // 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] = 0; }
+
+ 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;