+ };
+
+ // 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;
+ };
+
+ // Base vector for identifying TopoSigs. The contents uniquely identify a
+ // TopoSig, only computeSuperRegs needs to know how.
+ typedef SmallVector<unsigned, 16> TopoSigId;
+
+ // CodeGenRegBank - Represent a target's registers and the relations between
+ // them.
+ class CodeGenRegBank {
+ SetTheory Sets;
+
+ // SubRegIndices.
+ std::vector<CodeGenSubRegIndex*> SubRegIndices;
+ DenseMap<Record*, CodeGenSubRegIndex*> Def2SubRegIdx;
+
+ CodeGenSubRegIndex *createSubRegIndex(StringRef Name, StringRef NameSpace);
+
+ typedef std::map<SmallVector<CodeGenSubRegIndex*, 8>,
+ CodeGenSubRegIndex*> ConcatIdxMap;
+ ConcatIdxMap ConcatIdx;
+
+ // Registers.
+ std::vector<CodeGenRegister*> Registers;
+ StringMap<CodeGenRegister*> RegistersByName;
+ DenseMap<Record*, CodeGenRegister*> Def2Reg;
+ unsigned NumNativeRegUnits;
+
+ std::map<TopoSigId, unsigned> TopoSigs;
+
+ // Includes native (0..NumNativeRegUnits-1) and adopted register units.
+ SmallVector<RegUnit, 8> RegUnits;
+
+ // Register classes.
+ std::vector<CodeGenRegisterClass*> RegClasses;
+ DenseMap<Record*, CodeGenRegisterClass*> Def2RC;
+ typedef std::map<CodeGenRegisterClass::Key, CodeGenRegisterClass*> RCKeyMap;
+ RCKeyMap Key2RC;
+
+ // Remember each unique set of register units. Initially, this contains a
+ // unique set for each register class. Simliar sets are coalesced with
+ // pruneUnitSets and new supersets are inferred during computeRegUnitSets.
+ std::vector<RegUnitSet> RegUnitSets;
+
+ // Map RegisterClass index to the index of the RegUnitSet that contains the
+ // class's units and any inferred RegUnit supersets.
+ //
+ // NOTE: This could grow beyond the number of register classes when we map
+ // register units to lists of unit sets. If the list of unit sets does not
+ // already exist for a register class, we create a new entry in this vector.
+ std::vector<std::vector<unsigned> > RegClassUnitSets;
+
+ // Add RC to *2RC maps.
+ void addToMaps(CodeGenRegisterClass*);
+
+ // Create a synthetic sub-class if it is missing.
+ CodeGenRegisterClass *getOrCreateSubClass(const CodeGenRegisterClass *RC,
+ const CodeGenRegister::Set *Membs,
+ StringRef Name);
+
+ // Infer missing register classes.
+ void computeInferredRegisterClasses();
+ void inferCommonSubClass(CodeGenRegisterClass *RC);
+ void inferSubClassWithSubReg(CodeGenRegisterClass *RC);
+ void inferMatchingSuperRegClass(CodeGenRegisterClass *RC,
+ unsigned FirstSubRegRC = 0);
+
+ // Iteratively prune unit sets.
+ void pruneUnitSets();
+
+ // Compute a weight for each register unit created during getSubRegs.
+ void computeRegUnitWeights();
+
+ // Create a RegUnitSet for each RegClass and infer superclasses.
+ void computeRegUnitSets();
+
+ // Populate the Composite map from sub-register relationships.
+ void computeComposites();
+
+ // Compute a lane mask for each sub-register index.
+ void computeSubRegIndexLaneMasks();
+
+ public:
+ CodeGenRegBank(RecordKeeper&);
+
+ SetTheory &getSets() { return Sets; }
+
+ // Sub-register indices. The first NumNamedIndices are defined by the user
+ // in the .td files. The rest are synthesized such that all sub-registers
+ // have a unique name.
+ ArrayRef<CodeGenSubRegIndex*> getSubRegIndices() { return SubRegIndices; }
+
+ // Find a SubRegIndex form its Record def.
+ CodeGenSubRegIndex *getSubRegIdx(Record*);
+
+ // Find or create a sub-register index representing the A+B composition.
+ CodeGenSubRegIndex *getCompositeSubRegIndex(CodeGenSubRegIndex *A,
+ CodeGenSubRegIndex *B);
+
+ // Find or create a sub-register index representing the concatenation of
+ // non-overlapping sibling indices.
+ CodeGenSubRegIndex *
+ getConcatSubRegIndex(const SmallVector<CodeGenSubRegIndex*, 8>&);
+
+ void
+ addConcatSubRegIndex(const SmallVector<CodeGenSubRegIndex*, 8> &Parts,
+ CodeGenSubRegIndex *Idx) {
+ ConcatIdx.insert(std::make_pair(Parts, Idx));
+ }
+
+ const std::vector<CodeGenRegister*> &getRegisters() { return Registers; }
+ const StringMap<CodeGenRegister*> &getRegistersByName() {
+ return RegistersByName;
+ }
+
+ // Find a register from its Record def.
+ CodeGenRegister *getReg(Record*);
+
+ // Get a Register's index into the Registers array.
+ unsigned getRegIndex(const CodeGenRegister *Reg) const {
+ return Reg->EnumValue - 1;
+ }
+
+ // Return the number of allocated TopoSigs. The first TopoSig representing
+ // leaf registers is allocated number 0.
+ unsigned getNumTopoSigs() const {
+ return TopoSigs.size();
+ }
+
+ // Find or create a TopoSig for the given TopoSigId.
+ // This function is only for use by CodeGenRegister::computeSuperRegs().
+ // Others should simply use Reg->getTopoSig().
+ unsigned getTopoSig(const TopoSigId &Id) {
+ return TopoSigs.insert(std::make_pair(Id, TopoSigs.size())).first->second;
+ }
+
+ // Create a native register unit that is associated with one or two root
+ // registers.
+ unsigned newRegUnit(CodeGenRegister *R0, CodeGenRegister *R1 = 0) {
+ RegUnits.resize(RegUnits.size() + 1);
+ RegUnits.back().Roots[0] = R0;
+ RegUnits.back().Roots[1] = R1;
+ return RegUnits.size() - 1;
+ }
+
+ // Create a new non-native register unit that can be adopted by a register
+ // to increase its pressure. Note that NumNativeRegUnits is not increased.
+ unsigned newRegUnit(unsigned Weight) {
+ RegUnits.resize(RegUnits.size() + 1);
+ RegUnits.back().Weight = Weight;
+ return RegUnits.size() - 1;
+ }
+
+ // Native units are the singular unit of a leaf register. Register aliasing
+ // is completely characterized by native units. Adopted units exist to give
+ // register additional weight but don't affect aliasing.
+ bool isNativeUnit(unsigned RUID) {
+ return RUID < NumNativeRegUnits;
+ }
+
+ unsigned getNumNativeRegUnits() const {
+ return NumNativeRegUnits;
+ }
+
+ RegUnit &getRegUnit(unsigned RUID) { return RegUnits[RUID]; }
+ const RegUnit &getRegUnit(unsigned RUID) const { return RegUnits[RUID]; }
+
+ ArrayRef<CodeGenRegisterClass*> getRegClasses() const {
+ return RegClasses;
+ }
+
+ // Find a register class from its def.
+ CodeGenRegisterClass *getRegClass(Record*);
+
+ /// getRegisterClassForRegister - Find the register class that contains the
+ /// specified physical register. If the register is not in a register
+ /// class, return null. If the register is in multiple classes, and the
+ /// classes have a superset-subset relationship and the same set of types,
+ /// return the superclass. Otherwise return null.
+ const CodeGenRegisterClass* getRegClassForRegister(Record *R);
+
+ // Get the sum of unit weights.
+ unsigned getRegUnitSetWeight(const std::vector<unsigned> &Units) const {
+ unsigned Weight = 0;
+ for (std::vector<unsigned>::const_iterator
+ I = Units.begin(), E = Units.end(); I != E; ++I)
+ Weight += getRegUnit(*I).Weight;
+ return Weight;
+ }
+
+ // Increase a RegUnitWeight.
+ void increaseRegUnitWeight(unsigned RUID, unsigned Inc) {
+ getRegUnit(RUID).Weight += Inc;
+ }
+
+ // Get the number of register pressure dimensions.
+ unsigned getNumRegPressureSets() const { return RegUnitSets.size(); }
+
+ // Get a set of register unit IDs for a given dimension of pressure.
+ RegUnitSet getRegPressureSet(unsigned Idx) const {
+ return RegUnitSets[Idx];
+ }
+
+ // The number of pressure set lists may be larget than the number of
+ // register classes if some register units appeared in a list of sets that
+ // did not correspond to an existing register class.
+ unsigned getNumRegClassPressureSetLists() const {
+ return RegClassUnitSets.size();
+ }
+
+ // Get a list of pressure set IDs for a register class. Liveness of a
+ // register in this class impacts each pressure set in this list by the
+ // weight of the register. An exact solution requires all registers in a
+ // class to have the same class, but it is not strictly guaranteed.
+ ArrayRef<unsigned> getRCPressureSetIDs(unsigned RCIdx) const {
+ return RegClassUnitSets[RCIdx];
+ }
+
+ // Computed derived records such as missing sub-register indices.
+ void computeDerivedInfo();
+
+ // Compute the set of registers completely covered by the registers in Regs.
+ // The returned BitVector will have a bit set for each register in Regs,
+ // all sub-registers, and all super-registers that are covered by the
+ // registers in Regs.
+ //
+ // This is used to compute the mask of call-preserved registers from a list
+ // of callee-saves.
+ BitVector computeCoveredRegisters(ArrayRef<Record*> Regs);