- PhysRegSUOper(SUnit *su, int op): SU(su), OpIdx(op) {}
- };
-
- /// Combine a SparseSet with a 1x1 vector to track physical registers.
- /// The SparseSet allows iterating over the (few) live registers for quickly
- /// comparing against a regmask or clearing the set.
- ///
- /// Storage for the map is allocated once for the pass. The map can be
- /// cleared between scheduling regions without freeing unused entries.
- class Reg2SUnitsMap {
- SparseSet<unsigned> PhysRegSet;
- std::vector<std::vector<PhysRegSUOper> > SUnits;
- public:
- typedef SparseSet<unsigned>::const_iterator const_iterator;
-
- // Allow iteration over register numbers (keys) in the map. If needed, we
- // can provide an iterator over SUnits (values) as well.
- const_iterator reg_begin() const { return PhysRegSet.begin(); }
- const_iterator reg_end() const { return PhysRegSet.end(); }
-
- /// Initialize the map with the number of registers.
- /// If the map is already large enough, no allocation occurs.
- /// For simplicity we expect the map to be empty().
- void setRegLimit(unsigned Limit);
-
- /// Returns true if the map is empty.
- bool empty() const { return PhysRegSet.empty(); }
-
- /// Clear the map without deallocating storage.
- void clear();
-
- bool contains(unsigned Reg) const { return PhysRegSet.count(Reg); }
-
- /// If this register is mapped, return its existing SUnits vector.
- /// Otherwise map the register and return an empty SUnits vector.
- std::vector<PhysRegSUOper> &operator[](unsigned Reg) {
- bool New = PhysRegSet.insert(Reg).second;
- assert((!New || SUnits[Reg].empty()) && "stale SUnits vector");
- (void)New;
- return SUnits[Reg];
- }