1 # Copyright (c) 2012 Mark D. Hill and David A. Wood
2 # Copyright (c) 2015 The University of Wisconsin
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions are
7 # met: redistributions of source code must retain the above copyright
8 # notice, this list of conditions and the following disclaimer;
9 # redistributions in binary form must reproduce the above copyright
10 # notice, this list of conditions and the following disclaimer in the
11 # documentation and/or other materials provided with the distribution;
12 # neither the name of the copyright holders nor the names of its
13 # contributors may be used to endorse or promote products derived from
14 # this software without specific prior written permission.
16 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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26 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 # Authors: Nilay Vaish and Dibakar Gope
30 from m5
.SimObject
import SimObject
31 from m5
.params
import *
33 class BranchPredictor(SimObject
):
34 type = 'BranchPredictor'
35 cxx_class
= 'BPredUnit'
36 cxx_header
= "cpu/pred/bpred_unit.hh"
39 numThreads
= Param
.Unsigned(1, "Number of threads")
40 BTBEntries
= Param
.Unsigned(4096, "Number of BTB entries")
41 BTBTagSize
= Param
.Unsigned(16, "Size of the BTB tags, in bits")
42 RASSize
= Param
.Unsigned(16, "RAS size")
43 instShiftAmt
= Param
.Unsigned(2, "Number of bits to shift instructions by")
46 class LocalBP(BranchPredictor
):
49 cxx_header
= "cpu/pred/2bit_local.hh"
51 localPredictorSize
= Param
.Unsigned(2048, "Size of local predictor")
52 localCtrBits
= Param
.Unsigned(2, "Bits per counter")
55 class TournamentBP(BranchPredictor
):
57 cxx_class
= 'TournamentBP'
58 cxx_header
= "cpu/pred/tournament.hh"
60 localPredictorSize
= Param
.Unsigned(2048, "Size of local predictor")
61 localCtrBits
= Param
.Unsigned(2, "Bits per counter")
62 localHistoryTableSize
= Param
.Unsigned(2048, "size of local history table")
63 globalPredictorSize
= Param
.Unsigned(8192, "Size of global predictor")
64 globalCtrBits
= Param
.Unsigned(2, "Bits per counter")
65 choicePredictorSize
= Param
.Unsigned(8192, "Size of choice predictor")
66 choiceCtrBits
= Param
.Unsigned(2, "Bits of choice counters")
69 class BiModeBP(BranchPredictor
):
71 cxx_class
= 'BiModeBP'
72 cxx_header
= "cpu/pred/bi_mode.hh"
74 globalPredictorSize
= Param
.Unsigned(8192, "Size of global predictor")
75 globalCtrBits
= Param
.Unsigned(2, "Bits per counter")
76 choicePredictorSize
= Param
.Unsigned(8192, "Size of choice predictor")
77 choiceCtrBits
= Param
.Unsigned(2, "Bits of choice counters")