diff options
Diffstat (limited to 'base/sat_counter.hh')
| -rw-r--r-- | base/sat_counter.hh | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/base/sat_counter.hh b/base/sat_counter.hh deleted file mode 100644 index d7be17b6f..000000000 --- a/base/sat_counter.hh +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Copyright (c) 2001-2005 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 __SAT_COUNTER_HH__ -#define __SAT_COUNTER_HH__ - -#include <string> - -#include "base/predictor.hh" - -#include "base/statistics.hh" -#include "sim/stats.hh" - -// -// -// A simple saturating counter predictor -// -// -class SaturatingCounterPred : public GenericPredictor -{ - private: - std::string pred_name; - std::string zero_name; - std::string one_name; - - unsigned index_bits; - unsigned counter_bits; - unsigned zero_change; - unsigned one_change; - unsigned thresh; - unsigned init_value; - - unsigned max_value; // maximum counter value - - unsigned long max_index; // also the index mask value - unsigned *table; - - // Statistics - Stats::Scalar<> predicted_one; // Total predictions of one, preds_one - Stats::Scalar<> predicted_zero; // Total predictions of zero, preds_zero - Stats::Scalar<> correct_pred_one; // Total correct predictions of one, correct_one - Stats::Scalar<> correct_pred_zero; // Total correct predictions of zero, correct_zero - - Stats::Scalar<> record_zero; //updates_zero - Stats::Scalar<> record_one; //updates_one - - Stats::Formula preds_total; - Stats::Formula pred_frac_zero; - Stats::Formula pred_frac_one; - Stats::Formula correct_total; - Stats::Formula updates_total; - Stats::Formula pred_rate; - Stats::Formula frac_correct_zero; - Stats::Formula frac_correct_one; - Stats::Formula coverage_zero; - Stats::Formula coverage_one; - - private: - bool pred_one(unsigned &counter) { return counter > thresh; } - bool pred_zero(unsigned &counter) { return counter <= thresh; } - - void update_one(unsigned &counter) { - - if (one_change) - counter += one_change; - else - counter = 0; - - // check for wrap - if (counter > max_value) - counter = max_value; - } - - void update_zero(unsigned &counter) { - if (zero_change) { - // check for wrap - if (counter < zero_change) - counter = 0; - else - counter -= zero_change; - } else - counter = 0; - } - - - public: - - SaturatingCounterPred(std::string p_name, - std::string z_name, std::string o_name, - unsigned _index_bits, unsigned _counter_bits = 2, - unsigned _zero_change = 1, unsigned _one_change = 1, - unsigned _thresh = 1, unsigned _init_value = 0); - - void clear() { - for (int i = 0; i <= max_index; ++i) - table[i] = init_value; - } - - // Record the ACTUAL result... and indicate whether the prediction - // corresponding to this event was correct - void record(unsigned long _index, unsigned _val, unsigned _predicted, - unsigned _pdata) - { - record(_index, _val, _predicted); - } - - void record(unsigned long _index, unsigned _val, unsigned _predicted) { - unsigned long index = _index & max_index; - - if (_val) { - update_one(table[index]); - ++record_one; - - if (_predicted) - ++correct_pred_one; - } else { - update_zero(table[index]); - ++record_zero; - - if (!_predicted) - ++correct_pred_zero; - } - } - - unsigned value(unsigned long _index) { - unsigned long index = _index & max_index; - - return table[index]; - } - - - unsigned predict(unsigned long _index, unsigned &pdata) { - return predict(_index); - } - - unsigned predict(unsigned long _index) { - unsigned long index = _index & max_index; - - if (pred_one(table[index])) { - ++predicted_one; - return 1; - } - - ++predicted_zero; - return 0; - } - - // No internal state is changed here - unsigned peek(unsigned long _index) { - unsigned long index = _index & max_index; - - if (pred_one(table[index])) - return 1; - - return 0; - } - - - //======================================================= - void regStats(); - void regFormulas(); -}; - - -#endif // __SAT_COUNTER_HH__ |