c2fcac7c0d
cpu/base_dyn_inst.cc:
Remove unused commented out code.
cpu/base_dyn_inst.hh:
Fix up comments.
cpu/beta_cpu/2bit_local_pred.cc:
Reorder code to match header file.
cpu/beta_cpu/2bit_local_pred.hh:
Update comments.
cpu/beta_cpu/alpha_dyn_inst.hh:
Remove useless comments.
cpu/beta_cpu/alpha_dyn_inst_impl.hh:
cpu/beta_cpu/alpha_full_cpu_impl.hh:
cpu/beta_cpu/comm.hh:
cpu/beta_cpu/iew_impl.hh:
Remove unused commented code.
cpu/beta_cpu/alpha_full_cpu.hh:
Remove obsolete comment.
cpu/beta_cpu/alpha_impl.hh:
cpu/beta_cpu/full_cpu.hh:
Alphabetize includes.
cpu/beta_cpu/bpred_unit.hh:
Remove unused global history code.
cpu/beta_cpu/btb.hh:
cpu/beta_cpu/free_list.hh:
Use full path in #defines.
cpu/beta_cpu/commit.hh:
cpu/beta_cpu/decode.hh:
Reorder functions.
cpu/beta_cpu/commit_impl.hh:
Remove obsolete commented code.
cpu/beta_cpu/fetch.hh:
Remove obsolete comments.
cpu/beta_cpu/fetch_impl.hh:
cpu/beta_cpu/rename_impl.hh:
Remove commented code.
cpu/beta_cpu/full_cpu.cc:
Remove useless defines.
cpu/beta_cpu/inst_queue.hh:
Use full path for #defines.
cpu/beta_cpu/inst_queue_impl.hh:
Reorder functions to match header file.
cpu/beta_cpu/mem_dep_unit.hh:
Use full path name for #defines.
cpu/beta_cpu/ras.hh:
Use full path names for #defines. Remove mod operation.
cpu/beta_cpu/regfile.hh:
Remove unused commented code, fix up current comments.
cpu/beta_cpu/tournament_pred.cc:
cpu/beta_cpu/tournament_pred.hh:
Update programming style.
--HG--
extra : convert_revision : fb9d18a853f58a1108ff827e3c123d5b52a0608a
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
#ifndef __CPU_BETA_CPU_TOURNAMENT_PRED_HH__
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#define __CPU_BETA_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/beta_cpu/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_BETA_CPU_TOURNAMENT_PRED_HH__
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