scoreboard.hh

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#ifndef __CPU_MINOR_SCOREBOARD_HH__
#define __CPU_MINOR_SCOREBOARD_HH__
 
#include <vector>
 
#include "base/named.hh"
#include "base/types.hh"
#include "cpu/minor/cpu.hh"
#include "cpu/minor/dyn_inst.hh"
#include "cpu/minor/trace.hh"
#include "cpu/reg_class.hh"
 
namespace gem5
{
 
namespace minor
{
 
class Scoreboard : public Named
{
  public:
    const BaseISA::RegClasses regClasses;
 
    const unsigned intRegOffset;
    const unsigned floatRegOffset;
    const unsigned ccRegOffset;
    const unsigned vecRegOffset;
    const unsigned vecRegElemOffset;
    const unsigned vecPredRegOffset;
    const unsigned matRegOffset;
 
    const unsigned numRegs;
 
    typedef unsigned short int Index;
 
    std::vector<Index> numResults;
 
    std::vector<Index> numUnpredictableResults;
 
    std::vector<int> fuIndices;
    static constexpr int invalidFUIndex = -1;
 
    std::vector<Cycles> returnCycle;
 
    std::vector<InstSeqNum> writingInst;
 
  public:
    Scoreboard(const std::string &name,
            const BaseISA::RegClasses& reg_classes) :
        Named(name),
        regClasses(reg_classes),
        intRegOffset(0),
        floatRegOffset(intRegOffset + reg_classes.at(IntRegClass)->numRegs()),
        ccRegOffset(floatRegOffset + reg_classes.at(FloatRegClass)->numRegs()),
        vecRegOffset(ccRegOffset + reg_classes.at(CCRegClass)->numRegs()),
        vecRegElemOffset(vecRegOffset + reg_classes.at(VecRegClass)->numRegs()),
        vecPredRegOffset(vecRegElemOffset +
                reg_classes.at(VecElemClass)->numRegs()),
        matRegOffset(vecPredRegOffset +
                reg_classes.at(VecPredRegClass)->numRegs()),
        numRegs(matRegOffset + reg_classes.at(MatRegClass)->numRegs()),
        numResults(numRegs, 0),
        numUnpredictableResults(numRegs, 0),
        fuIndices(numRegs, invalidFUIndex),
        returnCycle(numRegs, Cycles(0)),
        writingInst(numRegs, 0)
    { }
 
  public:
    bool findIndex(const RegId& reg, Index &scoreboard_index);
 
    void markupInstDests(MinorDynInstPtr inst, Cycles retire_time,
        ThreadContext *thread_context, bool mark_unpredictable);
 
    void clearInstDests(MinorDynInstPtr inst, bool clear_unpredictable);
 
    InstSeqNum execSeqNumToWaitFor(MinorDynInstPtr inst,
        ThreadContext *thread_context);
 
    bool canInstIssue(MinorDynInstPtr inst,
        const std::vector<Cycles> *src_reg_relative_latencies,
        const std::vector<bool> *cant_forward_from_fu_indices,
        Cycles now, ThreadContext *thread_context);
 
    void minorTrace() const;
};
 
} // namespace minor
} // namespace gem5
 
#endif /* __CPU_MINOR_SCOREBOARD_HH__ */