BranchPredictor.py revision 10785
19480Snilay@cs.wisc.edu# Copyright (c) 2012 Mark D. Hill and David A. Wood 210785Sgope@wisc.edu# Copyright (c) 2015 The University of Wisconsin 39480Snilay@cs.wisc.edu# All rights reserved. 49480Snilay@cs.wisc.edu# 59480Snilay@cs.wisc.edu# Redistribution and use in source and binary forms, with or without 69480Snilay@cs.wisc.edu# modification, are permitted provided that the following conditions are 79480Snilay@cs.wisc.edu# met: redistributions of source code must retain the above copyright 89480Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer; 99480Snilay@cs.wisc.edu# redistributions in binary form must reproduce the above copyright 109480Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer in the 119480Snilay@cs.wisc.edu# documentation and/or other materials provided with the distribution; 129480Snilay@cs.wisc.edu# neither the name of the copyright holders nor the names of its 139480Snilay@cs.wisc.edu# contributors may be used to endorse or promote products derived from 149480Snilay@cs.wisc.edu# this software without specific prior written permission. 159480Snilay@cs.wisc.edu# 169480Snilay@cs.wisc.edu# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 179480Snilay@cs.wisc.edu# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 189480Snilay@cs.wisc.edu# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 199480Snilay@cs.wisc.edu# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 209480Snilay@cs.wisc.edu# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 219480Snilay@cs.wisc.edu# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 229480Snilay@cs.wisc.edu# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 239480Snilay@cs.wisc.edu# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 249480Snilay@cs.wisc.edu# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 259480Snilay@cs.wisc.edu# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 269480Snilay@cs.wisc.edu# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 279480Snilay@cs.wisc.edu# 2810785Sgope@wisc.edu# Authors: Nilay Vaish and Dibakar Gope 299480Snilay@cs.wisc.edu 309480Snilay@cs.wisc.edufrom m5.SimObject import SimObject 319480Snilay@cs.wisc.edufrom m5.params import * 329480Snilay@cs.wisc.edu 339480Snilay@cs.wisc.educlass BranchPredictor(SimObject): 349480Snilay@cs.wisc.edu type = 'BranchPredictor' 359480Snilay@cs.wisc.edu cxx_class = 'BPredUnit' 369480Snilay@cs.wisc.edu cxx_header = "cpu/pred/bpred_unit.hh" 3710785Sgope@wisc.edu abstract = True 389480Snilay@cs.wisc.edu 399480Snilay@cs.wisc.edu numThreads = Param.Unsigned(1, "Number of threads") 4010785Sgope@wisc.edu BTBEntries = Param.Unsigned(4096, "Number of BTB entries") 4110785Sgope@wisc.edu BTBTagSize = Param.Unsigned(16, "Size of the BTB tags, in bits") 4210785Sgope@wisc.edu RASSize = Param.Unsigned(16, "RAS size") 4310785Sgope@wisc.edu instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by") 4410785Sgope@wisc.edu 4510785Sgope@wisc.edu 4610785Sgope@wisc.educlass LocalBP(BranchPredictor): 4710785Sgope@wisc.edu type = 'LocalBP' 4810785Sgope@wisc.edu cxx_class = 'LocalBP' 4910785Sgope@wisc.edu cxx_header = "cpu/pred/2bit_local.hh" 5010785Sgope@wisc.edu 519480Snilay@cs.wisc.edu localPredictorSize = Param.Unsigned(2048, "Size of local predictor") 529480Snilay@cs.wisc.edu localCtrBits = Param.Unsigned(2, "Bits per counter") 5310785Sgope@wisc.edu 5410785Sgope@wisc.edu 5510785Sgope@wisc.educlass TournamentBP(BranchPredictor): 5610785Sgope@wisc.edu type = 'TournamentBP' 5710785Sgope@wisc.edu cxx_class = 'TournamentBP' 5810785Sgope@wisc.edu cxx_header = "cpu/pred/tournament.hh" 5910785Sgope@wisc.edu 6010785Sgope@wisc.edu localPredictorSize = Param.Unsigned(2048, "Size of local predictor") 6110785Sgope@wisc.edu localCtrBits = Param.Unsigned(2, "Bits per counter") 6210785Sgope@wisc.edu localHistoryTableSize = Param.Unsigned(2048, "size of local history table") 639480Snilay@cs.wisc.edu globalPredictorSize = Param.Unsigned(8192, "Size of global predictor") 649480Snilay@cs.wisc.edu globalCtrBits = Param.Unsigned(2, "Bits per counter") 659480Snilay@cs.wisc.edu choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor") 669480Snilay@cs.wisc.edu choiceCtrBits = Param.Unsigned(2, "Bits of choice counters") 679480Snilay@cs.wisc.edu 689480Snilay@cs.wisc.edu 6910785Sgope@wisc.educlass BiModeBP(BranchPredictor): 7010785Sgope@wisc.edu type = 'BiModeBP' 7110785Sgope@wisc.edu cxx_class = 'BiModeBP' 7210785Sgope@wisc.edu cxx_header = "cpu/pred/bi_mode.hh" 7310785Sgope@wisc.edu 7410785Sgope@wisc.edu globalPredictorSize = Param.Unsigned(8192, "Size of global predictor") 7510785Sgope@wisc.edu globalCtrBits = Param.Unsigned(2, "Bits per counter") 7610785Sgope@wisc.edu choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor") 7710785Sgope@wisc.edu choiceCtrBits = Param.Unsigned(2, "Bits of choice counters") 7810785Sgope@wisc.edu 79