BranchPredictor.py revision 9480
19480Snilay@cs.wisc.edu# Copyright (c) 2012 Mark D. Hill and David A. Wood 29480Snilay@cs.wisc.edu# All rights reserved. 39480Snilay@cs.wisc.edu# 49480Snilay@cs.wisc.edu# Redistribution and use in source and binary forms, with or without 59480Snilay@cs.wisc.edu# modification, are permitted provided that the following conditions are 69480Snilay@cs.wisc.edu# met: redistributions of source code must retain the above copyright 79480Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer; 89480Snilay@cs.wisc.edu# redistributions in binary form must reproduce the above copyright 99480Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer in the 109480Snilay@cs.wisc.edu# documentation and/or other materials provided with the distribution; 119480Snilay@cs.wisc.edu# neither the name of the copyright holders nor the names of its 129480Snilay@cs.wisc.edu# contributors may be used to endorse or promote products derived from 139480Snilay@cs.wisc.edu# this software without specific prior written permission. 149480Snilay@cs.wisc.edu# 159480Snilay@cs.wisc.edu# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 169480Snilay@cs.wisc.edu# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 179480Snilay@cs.wisc.edu# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 189480Snilay@cs.wisc.edu# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 199480Snilay@cs.wisc.edu# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 209480Snilay@cs.wisc.edu# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 219480Snilay@cs.wisc.edu# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 229480Snilay@cs.wisc.edu# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 239480Snilay@cs.wisc.edu# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 249480Snilay@cs.wisc.edu# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 259480Snilay@cs.wisc.edu# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 269480Snilay@cs.wisc.edu# 279480Snilay@cs.wisc.edu# Authors: Nilay Vaish 289480Snilay@cs.wisc.edu 299480Snilay@cs.wisc.edufrom m5.SimObject import SimObject 309480Snilay@cs.wisc.edufrom m5.params import * 319480Snilay@cs.wisc.edu 329480Snilay@cs.wisc.educlass BranchPredictor(SimObject): 339480Snilay@cs.wisc.edu type = 'BranchPredictor' 349480Snilay@cs.wisc.edu cxx_class = 'BPredUnit' 359480Snilay@cs.wisc.edu cxx_header = "cpu/pred/bpred_unit.hh" 369480Snilay@cs.wisc.edu 379480Snilay@cs.wisc.edu numThreads = Param.Unsigned(1, "Number of threads") 389480Snilay@cs.wisc.edu predType = Param.String("tournament", 399480Snilay@cs.wisc.edu "Branch predictor type ('local', 'tournament')") 409480Snilay@cs.wisc.edu localPredictorSize = Param.Unsigned(2048, "Size of local predictor") 419480Snilay@cs.wisc.edu localCtrBits = Param.Unsigned(2, "Bits per counter") 429480Snilay@cs.wisc.edu localHistoryTableSize = Param.Unsigned(2048, "Size of local history table") 439480Snilay@cs.wisc.edu localHistoryBits = Param.Unsigned(11, "Bits for the local history") 449480Snilay@cs.wisc.edu globalPredictorSize = Param.Unsigned(8192, "Size of global predictor") 459480Snilay@cs.wisc.edu globalCtrBits = Param.Unsigned(2, "Bits per counter") 469480Snilay@cs.wisc.edu globalHistoryBits = Param.Unsigned(13, "Bits of history") 479480Snilay@cs.wisc.edu choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor") 489480Snilay@cs.wisc.edu choiceCtrBits = Param.Unsigned(2, "Bits of choice counters") 499480Snilay@cs.wisc.edu 509480Snilay@cs.wisc.edu BTBEntries = Param.Unsigned(4096, "Number of BTB entries") 519480Snilay@cs.wisc.edu BTBTagSize = Param.Unsigned(16, "Size of the BTB tags, in bits") 529480Snilay@cs.wisc.edu 539480Snilay@cs.wisc.edu RASSize = Param.Unsigned(16, "RAS size") 549480Snilay@cs.wisc.edu instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by") 55