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/*
* Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
* All rights reserved.
*
* 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.
*/
#ifndef __FETCH_STAGE_HH__
#define __FETCH_STAGE_HH__
#include <string>
#include <vector>
#include "base/statistics.hh"
#include "base/stats/group.hh"
#include "gpu-compute/fetch_unit.hh"
namespace gem5
{
// Instruction fetch stage.
// All dispatched wavefronts for all SIMDS are analyzed for the
// need to fetch instructions. From the fetch eligible waves,
// one wave is selected from each SIMD and fetch is initiated
// for the selected waves.
class ComputeUnit;
class Wavefront;
class FetchStage
{
public:
FetchStage(const ComputeUnitParams &p, ComputeUnit &cu);
~FetchStage();
void init();
void exec();
void processFetchReturn(PacketPtr pkt);
void fetch(PacketPtr pkt, Wavefront *wave);
// Stats related variables and methods
const std::string& name() const { return _name; }
FetchUnit &fetchUnit(int simdId) { return _fetchUnit.at(simdId); }
private:
int numVectorALUs;
ComputeUnit &computeUnit;
// List of fetch units. A fetch unit is
// instantiated per VALU/SIMD
std::vector<FetchUnit> _fetchUnit;
const std::string _name;
protected:
struct FetchStageStats : public statistics::Group
{
FetchStageStats(statistics::Group *parent);
statistics::Distribution instFetchInstReturned;
} stats;
};
} // namespace gem5
#endif // __FETCH_STAGE_HH__