exec_stage.hh

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/*
 * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * For use for simulation and test purposes only
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 * this list of conditions and the following disclaimer.
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#ifndef __EXEC_STAGE_HH__
#define __EXEC_STAGE_HH__
 
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
 
#include "sim/stats.hh"
 
class ComputeUnit;
class ScheduleToExecute;
class Wavefront;
 
struct ComputeUnitParams;
 
enum STAT_STATUS
{
    IdleExec,
    BusyExec,
    PostExec
};
 
enum DISPATCH_STATUS
{
    EMPTY = 0, // no wave present in dispatchList slot
    EXREADY, // wave ready for execution
    SKIP, // extra memory resource needed, Shared Mem. only
};
 
// Execution stage.
// Each execution resource executes the
// wave which is in its dispatch list.
// The schedule stage is responsible for
// adding a wave into each execution resource's
// dispatch list.
 
class ExecStage
{
  public:
    ExecStage(const ComputeUnitParams* p, ComputeUnit &cu,
              ScheduleToExecute &from_schedule);
    ~ExecStage() { }
    void init();
    void exec();
 
    std::string dispStatusToStr(int j);
    void dumpDispList();
 
    const std::string& name() const { return _name; }
    void regStats();
    // number of idle cycles
    Stats::Scalar numCyclesWithNoIssue;
    // number of busy cycles
    Stats::Scalar numCyclesWithInstrIssued;
    // number of cycles during which at least one
    // instruction was issued to an execution resource type
    Stats::Vector numCyclesWithInstrTypeIssued;
    // number of idle cycles during which the scheduler
    // issued no instructions targeting a specific
    // execution resource type
    Stats::Vector numCyclesWithNoInstrTypeIssued;
    // SIMDs active per cycle
    Stats::Distribution spc;
 
  private:
    void collectStatistics(enum STAT_STATUS stage, int unitId);
    void initStatistics();
    ComputeUnit &computeUnit;
    ScheduleToExecute &fromSchedule;
 
    bool lastTimeInstExecuted;
    bool thisTimeInstExecuted;
    bool instrExecuted;
    Stats::Scalar  numTransActiveIdle;
    Stats::Distribution idleDur;
    int executionResourcesUsed;
    uint64_t idle_dur;
    const std::string _name;
};
 
#endif // __EXEC_STAGE_HH__