fu_pool.hh

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 * Authors: Kevin Lim
 */

#ifndef __CPU_O3_FU_POOL_HH__
#define __CPU_O3_FU_POOL_HH__

#include <array>
#include <bitset>
#include <list>
#include <string>
#include <vector>

#include "cpu/op_class.hh"
#include "params/FUPool.hh"
#include "sim/sim_object.hh"

class FUDesc;
class FuncUnit;

class FUPool : public SimObject
{
  private:
    std::array<Cycles, Num_OpClasses> maxOpLatencies;
    std::array<bool, Num_OpClasses> pipelined;

    std::bitset<Num_OpClasses> capabilityList;

    std::vector<bool> unitBusy;

    std::vector<int> unitsToBeFreed;

    class FUIdxQueue {
      public:
        FUIdxQueue()
            : idx(0), size(0)
        { }

        inline void addFU(int fu_idx);

        inline int getFU();

      private:
        int idx;

        int size;

        std::vector<int> funcUnitsIdx;
    };

    FUIdxQueue fuPerCapList[Num_OpClasses];

    int numFU;

    std::vector<FuncUnit *> funcUnits;

    typedef std::vector<FuncUnit *>::iterator fuListIterator;

  public:
    typedef FUPoolParams Params;
    FUPool(const Params *p);
    ~FUPool();

    static constexpr auto NoCapableFU = -2;
    static constexpr auto NoFreeFU = -1;
    int getUnit(OpClass capability);

    void freeUnitNextCycle(int fu_idx);

    void processFreeUnits();

    int size() { return numFU; }

    void dump();

    Cycles getOpLatency(OpClass capability) {
        return maxOpLatencies[capability];
    }

    bool isPipelined(OpClass capability) {
        return pipelined[capability];
    }

    bool isDrained() const;

    void takeOverFrom() {};
};

#endif // __CPU_O3_FU_POOL_HH__