src/gpu-compute/fetch_stage.hh

   1 /*
   2  * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
   3  * All rights reserved.
   4  *
   5  * For use for simulation and test purposes only
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   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  * this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright notice,
  14  * this list of conditions and the following disclaimer in the documentation
  15  * and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the copyright holder nor the names of its
  18  * contributors may be used to endorse or promote products derived from this
  19  * software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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  33
  34 #ifndef __FETCH_STAGE_HH__
  35 #define __FETCH_STAGE_HH__
  36
  37 #include <string>
  38 #include <vector>
  39
  40 #include "gpu-compute/fetch_unit.hh"
  41
  42 // Instruction fetch stage.
  43 // All dispatched wavefronts for all SIMDS are analyzed for the
  44 // need to fetch instructions. From the fetch eligible waves,
  45 // one wave is selected from each SIMD and fetch is initiated
  46 // for the selected waves.
  47
  48 class ComputeUnit;
  49 class Wavefront;
  50
  51 class FetchStage
  52 {
  53   public:
  54     FetchStage(const ComputeUnitParams* params);
  55     ~FetchStage();
  56     void init(ComputeUnit *cu);
  57     void exec();
  58     void processFetchReturn(PacketPtr pkt);
  59     void fetch(PacketPtr pkt, Wavefront *wave);
  60
  61     // Stats related variables and methods
  62     std::string name() { return _name; }
  63     void regStats();
  64     Stats::Distribution instFetchInstReturned;
  65     FetchUnit &fetchUnit(int simdId) { return _fetchUnit.at(simdId); }
  66
  67   private:
  68     int numVectorALUs;
  69     ComputeUnit *computeUnit;
  70
  71     // List of fetch units. A fetch unit is
  72     // instantiated per VALU/SIMD
  73     std::vector<FetchUnit> _fetchUnit;
  74     std::string _name;
  75 };
  76
  77 #endif // __FETCH_STAGE_HH__