fetch_stage.hh revision 11308 
1/*
2 * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
3 * All rights reserved.
4 *
5 * For use for simulation and test purposes only
6 *
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 contributors
18 * may be used to endorse or promote products derived from this software
19 * 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
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Author: Anthony Gutierrez, Sooraj Puthoor
34 */
35
36#ifndef __FETCH_STAGE_HH__
37#define __FETCH_STAGE_HH__
38
39#include <string>
40#include <vector>
41
42#include "gpu-compute/fetch_unit.hh"
43
44// Instruction fetch stage.
45// All dispatched wavefronts for all SIMDS are analyzed for the
46// need to fetch instructions. From the fetch eligible waves,
47// one wave is selected from each SIMD and fetch is initiated
48// for the selected waves.
49
50class ComputeUnit;
51class Wavefront;
52
53class FetchStage
54{
55  public:
56    FetchStage(const ComputeUnitParams* params);
57    ~FetchStage();
58    void init(ComputeUnit *cu);
59    void exec();
60    void processFetchReturn(PacketPtr pkt);
61    void fetch(PacketPtr pkt, Wavefront *wave);
62
63    // Stats related variables and methods
64    std::string name() { return _name; }
65    void regStats();
66    Stats::Distribution instFetchInstReturned;
67
68  private:
69    uint32_t numSIMDs;
70    ComputeUnit *computeUnit;
71
72    // List of fetch units. A fetch unit is
73    // instantiated per SIMD
74    std::vector<FetchUnit> fetchUnit;
75    std::string _name;
76};
77
78#endif // __FETCH_STAGE_HH__
79