1/* 2 * Copyright (c) 2018 Metempsy Technology Consulting 3 * All rights reserved. 4 * 5 * Copyright (c) 2006 INRIA (Institut National de Recherche en 6 * Informatique et en Automatique / French National Research Institute 7 * for Computer Science and Applied Mathematics) 8 * 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions are 13 * met: redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer; 15 * redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution; 18 * neither the name of the copyright holders nor the names of its 19 * contributors may be used to endorse or promote products derived from 20 * this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * Author: André Seznec, Pau Cabre, Javier Bueno 35 * 36 */ 37 38/* 39 * 8KB TAGE-SC-L branch predictor (devised by Andre Seznec) 40 */ 41 42#ifndef __CPU_PRED_TAGE_SC_L_8KB 43#define __CPU_PRED_TAGE_SC_L_8KB 44 45#include "cpu/pred/tage_sc_l.hh" 46#include "params/TAGE_SC_L_8KB.hh" 47#include "params/TAGE_SC_L_8KB_StatisticalCorrector.hh" 48#include "params/TAGE_SC_L_TAGE_8KB.hh" 49 50class TAGE_SC_L_TAGE_8KB : public TAGE_SC_L_TAGE 51{ 52 public: 53 TAGE_SC_L_TAGE_8KB(const TAGE_SC_L_TAGE_8KBParams *p) : TAGE_SC_L_TAGE(p) 54 {} 55 56 void initFoldedHistories(ThreadHistory & history) override; 57 int gindex_ext(int index, int bank) const override; 58 59 uint16_t gtag(ThreadID tid, Addr pc, int bank) const override; 60 61 void handleAllocAndUReset( 62 bool alloc, bool taken, TAGEBase::BranchInfo* bi, int nrand) override; 63 64 void handleTAGEUpdate( 65 Addr branch_pc, bool taken, TAGEBase::BranchInfo* bi) override; 66 67 void resetUctr(uint8_t & u) override; 68}; 69 70class TAGE_SC_L_8KB_StatisticalCorrector : public StatisticalCorrector 71{ 72 // global branch history GEHL 73 const unsigned gnb; 74 const unsigned logGnb; 75 std::vector<int> gm; 76 std::vector<int8_t> * ggehl; 77 std::vector<int8_t> wg; 78 79 struct SC_8KB_ThreadHistory : public SCThreadHistory 80 { 81 SC_8KB_ThreadHistory() { 82 globalHist = 0; 83 } 84 int64_t globalHist; // global history 85 }; 86 87 SCThreadHistory *makeThreadHistory() override; 88 89 public: 90 TAGE_SC_L_8KB_StatisticalCorrector( 91 TAGE_SC_L_8KB_StatisticalCorrectorParams *p); 92 93 unsigned getIndBiasBank( Addr branch_pc, BranchInfo* bi, int hitBank, 94 int altBank) const override; 95 96 int gPredictions( ThreadID tid, Addr branch_pc, 97 BranchInfo* bi, int & lsum, int64_t phist) override; 98 99 int gIndexLogsSubstr(int nbr, int i) override; 100 101 void scHistoryUpdate(
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