ltage.cc (13627:ec1395943cd2) ltage.cc (13685:bb3377c81303)
1/*
2 * Copyright (c) 2014 The University of Wisconsin
3 *
4 * Copyright (c) 2006 INRIA (Institut National de Recherche en
5 * Informatique et en Automatique / French National Research Institute
6 * for Computer Science and Applied Mathematics)
7 *
8 * All rights reserved.

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37/* @file
38 * Implementation of a L-TAGE branch predictor
39 */
40
41#include "cpu/pred/ltage.hh"
42
43#include "base/intmath.hh"
44#include "base/logging.hh"
1/*
2 * Copyright (c) 2014 The University of Wisconsin
3 *
4 * Copyright (c) 2006 INRIA (Institut National de Recherche en
5 * Informatique et en Automatique / French National Research Institute
6 * for Computer Science and Applied Mathematics)
7 *
8 * All rights reserved.

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37/* @file
38 * Implementation of a L-TAGE branch predictor
39 */
40
41#include "cpu/pred/ltage.hh"
42
43#include "base/intmath.hh"
44#include "base/logging.hh"
45#include "base/random.hh"
45#include "base/trace.hh"
46#include "debug/Fetch.hh"
47#include "debug/LTage.hh"
48
49LTAGE::LTAGE(const LTAGEParams *params)
50 : TAGE(params), loopPredictor(params->loop_predictor)
51{
52}
53
46#include "base/trace.hh"
47#include "debug/Fetch.hh"
48#include "debug/LTage.hh"
49
50LTAGE::LTAGE(const LTAGEParams *params)
51 : TAGE(params), loopPredictor(params->loop_predictor)
52{
53}
54
55void
56LTAGE::init()
57{
58 TAGE::init();
59}
60
54//prediction
55bool
56LTAGE::predict(ThreadID tid, Addr branch_pc, bool cond_branch, void* &b)
57{
58 LTageBranchInfo *bi = new LTageBranchInfo(*tage, *loopPredictor);
59 b = (void*)(bi);
60
61 bool pred_taken = tage->tagePredict(tid, branch_pc, cond_branch,

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77 }
78
79 // record final prediction
80 bi->lpBranchInfo->predTaken = pred_taken;
81
82 return pred_taken;
83}
84
61//prediction
62bool
63LTAGE::predict(ThreadID tid, Addr branch_pc, bool cond_branch, void* &b)
64{
65 LTageBranchInfo *bi = new LTageBranchInfo(*tage, *loopPredictor);
66 b = (void*)(bi);
67
68 bool pred_taken = tage->tagePredict(tid, branch_pc, cond_branch,

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84 }
85
86 // record final prediction
87 bi->lpBranchInfo->predTaken = pred_taken;
88
89 return pred_taken;
90}
91
92// PREDICTOR UPDATE
85void
86LTAGE::update(ThreadID tid, Addr branch_pc, bool taken, void* bp_history,
87 bool squashed, const StaticInstPtr & inst, Addr corrTarget)
88{
89 assert(bp_history);
90
91 LTageBranchInfo* bi = static_cast<LTageBranchInfo*>(bp_history);
92

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100
101 if (bi->tageBranchInfo->condBranch) {
102 loopPredictor->squashLoop(bi->lpBranchInfo);
103 }
104 }
105 return;
106 }
107
93void
94LTAGE::update(ThreadID tid, Addr branch_pc, bool taken, void* bp_history,
95 bool squashed, const StaticInstPtr & inst, Addr corrTarget)
96{
97 assert(bp_history);
98
99 LTageBranchInfo* bi = static_cast<LTageBranchInfo*>(bp_history);
100

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108
109 if (bi->tageBranchInfo->condBranch) {
110 loopPredictor->squashLoop(bi->lpBranchInfo);
111 }
112 }
113 return;
114 }
115
108 int nrand = TAGEBase::getRandom() & 3;
116 int nrand = random_mt.random<int>() & 3;
109 if (bi->tageBranchInfo->condBranch) {
110 DPRINTF(LTage, "Updating tables for branch:%lx; taken?:%d\n",
111 branch_pc, taken);
112 tage->updateStats(taken, bi->tageBranchInfo);
113
114 loopPredictor->updateStats(taken, bi->lpBranchInfo);
115
116 loopPredictor->condBranchUpdate(tid, branch_pc, taken,
117 if (bi->tageBranchInfo->condBranch) {
118 DPRINTF(LTage, "Updating tables for branch:%lx; taken?:%d\n",
119 branch_pc, taken);
120 tage->updateStats(taken, bi->tageBranchInfo);
121
122 loopPredictor->updateStats(taken, bi->lpBranchInfo);
123
124 loopPredictor->condBranchUpdate(tid, branch_pc, taken,
117 bi->tageBranchInfo->tagePred, bi->lpBranchInfo, instShiftAmt,
118 TAGEBase::getRandom(), TAGEBase::getRandom(),
119 TAGEBase::getRandom());
125 bi->tageBranchInfo->tagePred, bi->lpBranchInfo, instShiftAmt);
120
121 tage->condBranchUpdate(tid, branch_pc, taken, bi->tageBranchInfo,
126
127 tage->condBranchUpdate(tid, branch_pc, taken, bi->tageBranchInfo,
122 nrand, corrTarget);
128 nrand, corrTarget, bi->lpBranchInfo->predTaken);
123 }
124
125 tage->updateHistories(tid, branch_pc, taken, bi->tageBranchInfo, false,
126 inst, corrTarget);
127
128 delete bi;
129}
130

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130
131 tage->updateHistories(tid, branch_pc, taken, bi->tageBranchInfo, false,
132 inst, corrTarget);
133
134 delete bi;
135}
136

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