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-/*
- * Copyright (c) 2004-2005 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 __BPRED_UNIT_HH__
-#define __BPRED_UNIT_HH__
-
-// For Addr type.
-#include "arch/isa_traits.hh"
-#include "base/statistics.hh"
-#include "cpu/inst_seq.hh"
-
-#include "cpu/o3/2bit_local_pred.hh"
-#include "cpu/o3/tournament_pred.hh"
-#include "cpu/o3/btb.hh"
-#include "cpu/o3/ras.hh"
-
-#include <list>
-
-/**
- * Basically a wrapper class to hold both the branch predictor
- * and the BTB. Right now I'm unsure of the implementation; it would
- * be nicer to have something closer to the CPUPolicy or the Impl where
- * this is just typedefs, but it forces the upper level stages to be
- * aware of the constructors of the BP and the BTB. The nicer thing
- * to do is have this templated on the Impl, accept the usual Params
- * object, and be able to call the constructors on the BP and BTB.
- */
-template<class Impl>
-class TwobitBPredUnit
-{
- public:
- typedef typename Impl::Params Params;
- typedef typename Impl::DynInstPtr DynInstPtr;
-
- TwobitBPredUnit(Params &params);
-
- void regStats();
-
- bool predict(DynInstPtr &inst, Addr &PC);
-
- void update(const InstSeqNum &done_sn);
-
- void squash(const InstSeqNum &squashed_sn);
-
- void squash(const InstSeqNum &squashed_sn, const Addr &corr_target,
- bool actually_taken);
-
- bool BPLookup(Addr &inst_PC)
- { return BP.lookup(inst_PC); }
-
- bool BTBValid(Addr &inst_PC)
- { return BTB.valid(inst_PC); }
-
- Addr BTBLookup(Addr &inst_PC)
- { return BTB.lookup(inst_PC); }
-
- // Will want to include global history.
- void BPUpdate(Addr &inst_PC, bool taken)
- { BP.update(inst_PC, taken); }
-
- void BTBUpdate(Addr &inst_PC, Addr &target_PC)
- { BTB.update(inst_PC, target_PC); }
-
- private:
- struct PredictorHistory {
- PredictorHistory(const InstSeqNum &seq_num, const Addr &inst_PC,
- const bool pred_taken)
- : seqNum(seq_num), PC(inst_PC), predTaken(pred_taken),
- globalHistory(0), usedRAS(0), wasCall(0), RASIndex(0),
- RASTarget(0)
- { }
-
- InstSeqNum seqNum;
-
- Addr PC;
-
- bool predTaken;
-
- unsigned globalHistory;
-
- bool usedRAS;
-
- bool wasCall;
-
- unsigned RASIndex;
-
- Addr RASTarget;
- };
-
- std::list<PredictorHistory> predHist;
-
- DefaultBP BP;
-
- DefaultBTB BTB;
-
- ReturnAddrStack RAS;
-
- Stats::Scalar<> lookups;
- Stats::Scalar<> condPredicted;
- Stats::Scalar<> condIncorrect;
- Stats::Scalar<> BTBLookups;
- Stats::Scalar<> BTBHits;
- Stats::Scalar<> BTBCorrect;
- Stats::Scalar<> usedRAS;
- Stats::Scalar<> RASIncorrect;
-};
-
-#endif // __BPRED_UNIT_HH__