text: /*
   * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
   * All rights reserved.
   *
   * For use for simulation and test purposes only
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * 3. Neither the name of the copyright holder nor the names of its
   * contributors may be used to endorse or promote products derived from this
   * software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * Authors: Sooraj Puthoor,
   *          Mark Wyse
   */
  
  #ifndef __SCOREBOARD_CHECK_STAGE_HH__
  #define __SCOREBOARD_CHECK_STAGE_HH__
  
  #include <cstdint>
  #include <string>
  #include <utility>
  #include <vector>
  
  class ComputeUnit;
  class Wavefront;
  
  struct ComputeUnitParams;
  
  enum WAVE_STATUS
  {
      BLOCKED = 0,
      READY
  };
  
  /*
   * Scoreboard check stage.
   * All wavefronts are analyzed to see if they are ready
   * to be executed this cycle. Both structural and data
   * hazards are considered while marking a wave "ready"
   * for execution. After analysis, the ready waves are
   * added to readyList.
   */
  class ScoreboardCheckStage
  {
    public:
      ScoreboardCheckStage(const ComputeUnitParams* params);
      ~ScoreboardCheckStage();
      void init(ComputeUnit *cu);
      void exec();
  
      // Stats related variables and methods
      const std::string& name() const { return _name; }
      void regStats();
  
    private:
      void collectStatistics(Wavefront *curWave, int unitId);
      void initStatistics();
      ComputeUnit *computeUnit;
      uint32_t numSIMDs;
      uint32_t numMemUnits;
      uint32_t numShrMemPipes;
  
      // flag per vector SIMD unit that is set when there is at least one
      // WF that has a vector ALU instruction as the oldest in its
      // Instruction Buffer
      std::vector<bool> *vectorAluInstAvail;
      int lastGlbMemSimd;
      int lastShrMemSimd;
  
      int *glbMemInstAvail;
      int *shrMemInstAvail;
      // List of waves which are ready to be scheduled.
      // Each execution resource has a ready list
      std::vector<std::vector<Wavefront*>*> readyList;
  
      // Stores the status of waves. A READY implies the
      // wave is ready to be scheduled this cycle and
      // is already present in the readyList
      std::vector<std::vector<std::pair<Wavefront*, WAVE_STATUS>>*>
          waveStatusList;
  
      std::string _name;
  };
  
  #endif // __SCOREBOARD_CHECK_STAGE_HH__
  