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/*
* Copyright (c) 2018 Metempsy Technology Consulting
* All rights reserved.
*
* Copyright (c) 2006 INRIA (Institut National de Recherche en
* Informatique et en Automatique / French National Research Institute
* for Computer Science and Applied Mathematics)
*
* 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.
*
* Author: André Seznec, Pau Cabre, Javier Bueno
*
*/
/*
* 64KB TAGE-SC-L branch predictor (devised by Andre Seznec)
*
* Most of the code in this file has been adapted from cbp64KB/predictor.h in
* http://www.jilp.org/cbp2016/code/AndreSeznecLimited.tar.gz
*/
#ifndef __CPU_PRED_TAGE_SC_L_64KB
#define __CPU_PRED_TAGE_SC_L_64KB
#include "cpu/pred/tage_sc_l.hh"
#include "params/TAGE_SC_L_64KB.hh"
#include "params/TAGE_SC_L_64KB_StatisticalCorrector.hh"
#include "params/TAGE_SC_L_TAGE_64KB.hh"
class TAGE_SC_L_TAGE_64KB : public TAGE_SC_L_TAGE {
public:
TAGE_SC_L_TAGE_64KB(const TAGE_SC_L_TAGE_64KBParams *p) : TAGE_SC_L_TAGE(p)
{}
int gindex_ext(int index, int bank) const override;
uint16_t gtag(ThreadID tid, Addr pc, int bank) const override;
void handleAllocAndUReset(
bool alloc, bool taken, TAGEBase::BranchInfo* bi, int nrand) override;
void handleTAGEUpdate(
Addr branch_pc, bool taken, TAGEBase::BranchInfo* bi) override;
};
class TAGE_SC_L_64KB_StatisticalCorrector : public StatisticalCorrector
{
const unsigned numEntriesSecondLocalHistories;
const unsigned numEntriesThirdLocalHistories;
// global branch history variation GEHL
const unsigned pnb;
const unsigned logPnb;
std::vector<int> pm;
std::vector<int8_t> * pgehl;
std::vector<int8_t> wp;
// Second local history GEHL
const unsigned snb;
const unsigned logSnb;
std::vector<int> sm;
std::vector<int8_t> * sgehl;
std::vector<int8_t> ws;
// Third local history GEHL
const unsigned tnb;
const unsigned logTnb;
std::vector<int> tm;
std::vector<int8_t> * tgehl;
std::vector<int8_t> wt;
// Second IMLI GEHL
const unsigned imnb;
const unsigned logImnb;
std::vector<int> imm;
std::vector<int8_t> * imgehl;
std::vector<int8_t> wim;
struct SC_64KB_ThreadHistory : public SCThreadHistory
{
std::vector<int64_t> imHist;
};
SCThreadHistory *makeThreadHistory() override;
public:
TAGE_SC_L_64KB_StatisticalCorrector(
TAGE_SC_L_64KB_StatisticalCorrectorParams *p);
unsigned getIndBiasBank(Addr branch_pc, BranchInfo* bi, int hitBank,
int altBank) const override;
int gPredictions(ThreadID tid, Addr branch_pc, BranchInfo* bi,
int & lsum, int64_t phist) override;
int gIndexLogsSubstr(int nbr, int i) override;
void scHistoryUpdate(Addr branch_pc, const StaticInstPtr &inst, bool taken,
BranchInfo * tage_bi, Addr corrTarget) override;
void gUpdates(ThreadID tid, Addr pc, bool taken, BranchInfo* bi,
int64_t phist) override;
};
class TAGE_SC_L_64KB : public TAGE_SC_L
{
public:
TAGE_SC_L_64KB(const TAGE_SC_L_64KBParams *params);
};
#endif // __CPU_PRED_TAGE_SC_L_64KB
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