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diff --git a/src/gpu-compute/scoreboard_check_stage.hh b/src/gpu-compute/scoreboard_check_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
+ *
+ * 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.
+ *
+ * Author: Sooraj Puthoor
+ */
+
+#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 numGlbMemPipes;
+    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__