77b9829f13
base/timebuf.hh:
Updated copyright.
cpu/o3/2bit_local_pred.hh:
cpu/o3/alpha_cpu.hh:
cpu/o3/alpha_cpu_impl.hh:
cpu/o3/alpha_dyn_inst.hh:
cpu/o3/alpha_impl.hh:
cpu/o3/alpha_params.hh:
cpu/o3/btb.hh:
cpu/o3/comm.hh:
cpu/o3/commit.hh:
cpu/o3/cpu.cc:
cpu/o3/cpu.hh:
cpu/o3/cpu_policy.hh:
cpu/o3/decode.hh:
cpu/o3/fetch.hh:
cpu/o3/free_list.hh:
cpu/o3/iew.hh:
cpu/o3/inst_queue.hh:
cpu/o3/mem_dep_unit.hh:
cpu/o3/ras.hh:
cpu/o3/regfile.hh:
cpu/o3/rename.hh:
cpu/o3/rename_map.hh:
cpu/o3/rob.cc:
cpu/o3/rob.hh:
cpu/o3/rob_impl.hh:
cpu/o3/sat_counter.hh:
cpu/o3/store_set.hh:
cpu/o3/tournament_pred.hh:
Updated #define to have correct path.
docs/footer.html:
Remove e-mail addr.
--HG--
extra : convert_revision : 68d7af52674621dc3b6d6ac0d564790ffd595fe3
143 lines
4.8 KiB
C++
143 lines
4.8 KiB
C++
/*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CPU_O3_CPU_TOURNAMENT_PRED_HH__
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#define __CPU_O3_CPU_TOURNAMENT_PRED_HH__
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// For Addr type.
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#include "arch/alpha/isa_traits.hh"
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#include "cpu/o3/sat_counter.hh"
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class TournamentBP
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{
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public:
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/**
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* Default branch predictor constructor.
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*/
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TournamentBP(unsigned local_predictor_size,
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unsigned local_ctr_bits,
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unsigned local_history_table_size,
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unsigned local_history_bits,
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unsigned global_predictor_size,
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unsigned global_history_bits,
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unsigned global_ctr_bits,
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unsigned choice_predictor_size,
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unsigned choice_ctr_bits,
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unsigned instShiftAmt);
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/**
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* Looks up the given address in the branch predictor and returns
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* a true/false value as to whether it is taken.
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* @param branch_addr The address of the branch to look up.
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* @return Whether or not the branch is taken.
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*/
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bool lookup(Addr &branch_addr);
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/**
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* Updates the branch predictor with the actual result of a branch.
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* @param branch_addr The address of the branch to update.
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* @param taken Whether or not the branch was taken.
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*/
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void update(Addr &branch_addr, unsigned global_history, bool taken);
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inline unsigned readGlobalHist() { return globalHistory; }
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private:
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inline bool getPrediction(uint8_t &count);
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inline unsigned calcLocHistIdx(Addr &branch_addr);
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inline void updateHistoriesTaken(unsigned local_history_idx);
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inline void updateHistoriesNotTaken(unsigned local_history_idx);
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/** Local counters. */
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SatCounter *localCtrs;
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/** Size of the local predictor. */
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unsigned localPredictorSize;
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/** Number of bits of the local predictor's counters. */
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unsigned localCtrBits;
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/** Array of local history table entries. */
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unsigned *localHistoryTable;
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/** Size of the local history table. */
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unsigned localHistoryTableSize;
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/** Number of bits for each entry of the local history table.
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* @todo Doesn't this come from the size of the local predictor?
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*/
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unsigned localHistoryBits;
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/** Mask to get the proper local history. */
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unsigned localHistoryMask;
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/** Array of counters that make up the global predictor. */
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SatCounter *globalCtrs;
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/** Size of the global predictor. */
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unsigned globalPredictorSize;
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/** Number of bits of the global predictor's counters. */
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unsigned globalCtrBits;
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/** Global history register. */
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unsigned globalHistory;
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/** Number of bits for the global history. */
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unsigned globalHistoryBits;
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/** Mask to get the proper global history. */
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unsigned globalHistoryMask;
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/** Array of counters that make up the choice predictor. */
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SatCounter *choiceCtrs;
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/** Size of the choice predictor (identical to the global predictor). */
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unsigned choicePredictorSize;
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/** Number of bits of the choice predictor's counters. */
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unsigned choiceCtrBits;
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/** Number of bits to shift the instruction over to get rid of the word
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* offset.
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*/
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unsigned instShiftAmt;
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/** Threshold for the counter value; above the threshold is taken,
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* equal to or below the threshold is not taken.
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*/
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unsigned threshold;
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};
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#endif // __CPU_O3_CPU_TOURNAMENT_PRED_HH__
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