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Diffstat (limited to 'cpu/beta_cpu/tournament_pred.hh')
| -rw-r--r-- | cpu/beta_cpu/tournament_pred.hh | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/cpu/beta_cpu/tournament_pred.hh b/cpu/beta_cpu/tournament_pred.hh deleted file mode 100644 index d9a14e5c8..000000000 --- a/cpu/beta_cpu/tournament_pred.hh +++ /dev/null @@ -1,143 +0,0 @@ -/* - * Copyright (c) 2004-2005 The Regents of The University of Michigan - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer; - * redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution; - * neither the name of the copyright holders nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef __CPU_BETA_CPU_TOURNAMENT_PRED_HH__ -#define __CPU_BETA_CPU_TOURNAMENT_PRED_HH__ - -// For Addr type. -#include "arch/alpha/isa_traits.hh" -#include "cpu/beta_cpu/sat_counter.hh" - -class TournamentBP -{ - public: - /** - * Default branch predictor constructor. - */ - TournamentBP(unsigned local_predictor_size, - unsigned local_ctr_bits, - unsigned local_history_table_size, - unsigned local_history_bits, - unsigned global_predictor_size, - unsigned global_history_bits, - unsigned global_ctr_bits, - unsigned choice_predictor_size, - unsigned choice_ctr_bits, - unsigned instShiftAmt); - - /** - * Looks up the given address in the branch predictor and returns - * a true/false value as to whether it is taken. - * @param branch_addr The address of the branch to look up. - * @return Whether or not the branch is taken. - */ - bool lookup(Addr &branch_addr); - - /** - * Updates the branch predictor with the actual result of a branch. - * @param branch_addr The address of the branch to update. - * @param taken Whether or not the branch was taken. - */ - void update(Addr &branch_addr, unsigned global_history, bool taken); - - inline unsigned readGlobalHist() { return globalHistory; } - - private: - - inline bool getPrediction(uint8_t &count); - - inline unsigned calcLocHistIdx(Addr &branch_addr); - - inline void updateHistoriesTaken(unsigned local_history_idx); - - inline void updateHistoriesNotTaken(unsigned local_history_idx); - - /** Local counters. */ - SatCounter *localCtrs; - - /** Size of the local predictor. */ - unsigned localPredictorSize; - - /** Number of bits of the local predictor's counters. */ - unsigned localCtrBits; - - /** Array of local history table entries. */ - unsigned *localHistoryTable; - - /** Size of the local history table. */ - unsigned localHistoryTableSize; - - /** Number of bits for each entry of the local history table. - * @todo Doesn't this come from the size of the local predictor? - */ - unsigned localHistoryBits; - - /** Mask to get the proper local history. */ - unsigned localHistoryMask; - - - /** Array of counters that make up the global predictor. */ - SatCounter *globalCtrs; - - /** Size of the global predictor. */ - unsigned globalPredictorSize; - - /** Number of bits of the global predictor's counters. */ - unsigned globalCtrBits; - - /** Global history register. */ - unsigned globalHistory; - - /** Number of bits for the global history. */ - unsigned globalHistoryBits; - - /** Mask to get the proper global history. */ - unsigned globalHistoryMask; - - - /** Array of counters that make up the choice predictor. */ - SatCounter *choiceCtrs; - - /** Size of the choice predictor (identical to the global predictor). */ - unsigned choicePredictorSize; - - /** Number of bits of the choice predictor's counters. */ - unsigned choiceCtrBits; - - /** Number of bits to shift the instruction over to get rid of the word - * offset. - */ - unsigned instShiftAmt; - - /** Threshold for the counter value; above the threshold is taken, - * equal to or below the threshold is not taken. - */ - unsigned threshold; -}; - -#endif // __CPU_BETA_CPU_TOURNAMENT_PRED_HH__ |