bpred_unit_impl.hh

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· HH 代码 · 共 407 行

/*
 * Copyright (c) 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Kevin T. Lim
 */

#include "arch/types.hh"
#include "arch/isa_traits.hh"
#include "base/trace.hh"
#include "base/traceflags.hh"
#include "cpu/o3/bpred_unit.hh"

template<class Impl>
BPredUnit<Impl>::BPredUnit(Params *params)
  : BTB(params->BTBEntries,
        params->BTBTagSize,
        params->instShiftAmt)
{
    // Setup the selected predictor.
    if (params->predType == "local") {
        localBP = new LocalBP(params->localPredictorSize,
                              params->localCtrBits,
                              params->instShiftAmt);
        predictor = Local;
    } else if (params->predType == "tournament") {
        tournamentBP = new TournamentBP(params->localPredictorSize,
                                        params->localCtrBits,
                                        params->localHistoryTableSize,
                                        params->localHistoryBits,
                                        params->globalPredictorSize,
                                        params->globalHistoryBits,
                                        params->globalCtrBits,
                                        params->choicePredictorSize,
                                        params->choiceCtrBits,
                                        params->instShiftAmt);
        predictor = Tournament;
    } else {
        fatal("Invalid BP selected!");
    }

    for (int i=0; i < Impl::MaxThreads; i++)
        RAS[i].init(params->RASSize);
}

template <class Impl>
void
BPredUnit<Impl>::regStats()
{
    lookups
        .name(name() + ".BPredUnit.lookups")
        .desc("Number of BP lookups")
        ;

    condPredicted
        .name(name() + ".BPredUnit.condPredicted")
        .desc("Number of conditional branches predicted")
        ;

    condIncorrect
        .name(name() + ".BPredUnit.condIncorrect")
        .desc("Number of conditional branches incorrect")
        ;

    BTBLookups
        .name(name() + ".BPredUnit.BTBLookups")
        .desc("Number of BTB lookups")
        ;

    BTBHits
        .name(name() + ".BPredUnit.BTBHits")
        .desc("Number of BTB hits")
        ;

    BTBCorrect
        .name(name() + ".BPredUnit.BTBCorrect")
        .desc("Number of correct BTB predictions (this stat may not "
              "work properly.")
        ;

    usedRAS
        .name(name() + ".BPredUnit.usedRAS")
        .desc("Number of times the RAS was used to get a target.")
        ;

    RASIncorrect
        .name(name() + ".BPredUnit.RASInCorrect")
        .desc("Number of incorrect RAS predictions.")
        ;
}

template <class Impl>
void
BPredUnit<Impl>::switchOut()
{
    // Clear any state upon switch out.
    for (int i = 0; i < Impl::MaxThreads; ++i) {
        squash(0, i);
    }
}

template <class Impl>
void
BPredUnit<Impl>::takeOverFrom()
{
    // Can reset all predictor state, but it's not necessarily better
    // than leaving it be.
/*
    for (int i = 0; i < Impl::MaxThreads; ++i)
        RAS[i].reset();

    BP.reset();
    BTB.reset();
*/
}

template <class Impl>
bool
BPredUnit<Impl>::predict(DynInstPtr &inst, Addr &PC, unsigned tid)
{
    // See if branch predictor predicts taken.
    // If so, get its target addr either from the BTB or the RAS.
    // Save off record of branch stuff so the RAS can be fixed
    // up once it's done.

    using TheISA::MachInst;

    bool pred_taken = false;
    Addr target = PC;

    ++lookups;

    void *bp_history = NULL;

    if (inst->isUncondCtrl()) {
        DPRINTF(Fetch, "BranchPred: [tid:%i]: Unconditional control.\n", tid);
        pred_taken = true;
        // Tell the BP there was an unconditional branch.
        BPUncond(bp_history);
    } else {
        ++condPredicted;

        pred_taken = BPLookup(PC, bp_history);

        DPRINTF(Fetch, "BranchPred: [tid:%i]: Branch predictor predicted %i "
                "for PC %#x\n",
                tid, pred_taken, inst->readPC());
    }

    PredictorHistory predict_record(inst->seqNum, PC, pred_taken,
                                    bp_history, tid);

    // Now lookup in the BTB or RAS.
    if (pred_taken) {
        if (inst->isReturn()) {
            ++usedRAS;

            // If it's a function return call, then look up the address
            // in the RAS.
            target = RAS[tid].top();

            // Record the top entry of the RAS, and its index.
            predict_record.usedRAS = true;
            predict_record.RASIndex = RAS[tid].topIdx();
            predict_record.RASTarget = target;

            assert(predict_record.RASIndex < 16);

            RAS[tid].pop();

            DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x is a return, "
                    "RAS predicted target: %#x, RAS index: %i.\n",
                    tid, inst->readPC(), target, predict_record.RASIndex);
        } else {
            ++BTBLookups;

            if (inst->isCall()) {
#if ISA_HAS_DELAY_SLOT
                Addr ras_pc = PC + (2 * sizeof(MachInst)); // Next Next PC
#else
                Addr ras_pc = PC + sizeof(MachInst); // Next PC
#endif
                RAS[tid].push(ras_pc);

                // Record that it was a call so that the top RAS entry can
                // be popped off if the speculation is incorrect.
                predict_record.wasCall = true;

                DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x was a call"
                        ", adding %#x to the RAS index: %i.\n",
                        tid, inst->readPC(), ras_pc, RAS[tid].topIdx());
            }

            if (BTB.valid(PC, tid)) {
                ++BTBHits;

                // If it's not a return, use the BTB to get the target addr.
                target = BTB.lookup(PC, tid);

                DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x predicted"
                        " target is %#x.\n",
                        tid, inst->readPC(), target);

            } else {
                DPRINTF(Fetch, "BranchPred: [tid:%i]: BTB doesn't have a "
                        "valid entry.\n",tid);
                pred_taken = false;
            }

        }
    }

    PC = target;

    predHist[tid].push_front(predict_record);

    DPRINTF(Fetch, "[tid:%i]: predHist.size(): %i\n", tid, predHist[tid].size());

    return pred_taken;
}

template <class Impl>
void
BPredUnit<Impl>::update(const InstSeqNum &done_sn, unsigned tid)
{
    DPRINTF(Fetch, "BranchPred: [tid:%i]: Commiting branches until "
            "[sn:%lli].\n", tid, done_sn);

    while (!predHist[tid].empty() &&
           predHist[tid].back().seqNum <= done_sn) {
        // Update the branch predictor with the correct results.
        BPUpdate(predHist[tid].back().PC,
                 predHist[tid].back().predTaken,
                 predHist[tid].back().bpHistory);

        predHist[tid].pop_back();
    }
}

template <class Impl>
void
BPredUnit<Impl>::squash(const InstSeqNum &squashed_sn, unsigned tid)
{
    History &pred_hist = predHist[tid];

    while (!pred_hist.empty() &&
           pred_hist.front().seqNum > squashed_sn) {
        if (pred_hist.front().usedRAS) {
            DPRINTF(Fetch, "BranchPred: [tid:%i]: Restoring top of RAS to: %i,"
                    " target: %#x.\n",
                    tid,
                    pred_hist.front().RASIndex,
                    pred_hist.front().RASTarget);

            RAS[tid].restore(pred_hist.front().RASIndex,
                             pred_hist.front().RASTarget);
        } else if (pred_hist.front().wasCall) {
            DPRINTF(Fetch, "BranchPred: [tid:%i]: Removing speculative entry "
                    "added to the RAS.\n",tid);

            RAS[tid].pop();
        }

        // This call should delete the bpHistory.
        BPSquash(pred_hist.front().bpHistory);

        pred_hist.pop_front();
    }

}

template <class Impl>
void
BPredUnit<Impl>::squash(const InstSeqNum &squashed_sn,
                        const Addr &corr_target,
                        const bool actually_taken,
                        unsigned tid)
{
    // Now that we know that a branch was mispredicted, we need to undo
    // all the branches that have been seen up until this branch and
    // fix up everything.

    History &pred_hist = predHist[tid];

    ++condIncorrect;

    DPRINTF(Fetch, "BranchPred: [tid:%i]: Squashing from sequence number %i, "
            "setting target to %#x.\n",
            tid, squashed_sn, corr_target);

    squash(squashed_sn, tid);

    // If there's a squash due to a syscall, there may not be an entry
    // corresponding to the squash.  In that case, don't bother trying to
    // fix up the entry.
    if (!pred_hist.empty()) {
        assert(pred_hist.front().seqNum == squashed_sn);
        if (pred_hist.front().usedRAS) {
            ++RASIncorrect;
        }

        BPUpdate(pred_hist.front().PC, actually_taken,
                 pred_hist.front().bpHistory);

        BTB.update(pred_hist.front().PC, corr_target, tid);
        pred_hist.pop_front();
    }
}

template <class Impl>
void
BPredUnit<Impl>::BPUncond(void * &bp_history)
{
    // Only the tournament predictor cares about unconditional branches.
    if (predictor == Tournament) {
        tournamentBP->uncondBr(bp_history);
    }
}

template <class Impl>
void
BPredUnit<Impl>::BPSquash(void *bp_history)
{
    if (predictor == Local) {
        localBP->squash(bp_history);
    } else if (predictor == Tournament) {
        tournamentBP->squash(bp_history);
    } else {
        panic("Predictor type is unexpected value!");
    }
}

template <class Impl>
bool
BPredUnit<Impl>::BPLookup(Addr &inst_PC, void * &bp_history)
{
    if (predictor == Local) {
        return localBP->lookup(inst_PC, bp_history);
    } else if (predictor == Tournament) {
        return tournamentBP->lookup(inst_PC, bp_history);
    } else {
        panic("Predictor type is unexpected value!");
    }
}

template <class Impl>
void
BPredUnit<Impl>::BPUpdate(Addr &inst_PC, bool taken, void *bp_history)
{
    if (predictor == Local) {
        localBP->update(inst_PC, taken, bp_history);
    } else if (predictor == Tournament) {
        tournamentBP->update(inst_PC, taken, bp_history);
    } else {
        panic("Predictor type is unexpected value!");
    }
}

template <class Impl>
void
BPredUnit<Impl>::dump()
{
    typename History::iterator pred_hist_it;

    for (int i = 0; i < Impl::MaxThreads; ++i) {
        if (!predHist[i].empty()) {
            pred_hist_it = predHist[i].begin();

            cprintf("predHist[%i].size(): %i\n", i, predHist[i].size());

            while (pred_hist_it != predHist[i].end()) {
                cprintf("[sn:%lli], PC:%#x, tid:%i, predTaken:%i, "
                        "bpHistory:%#x\n",
                        (*pred_hist_it).seqNum, (*pred_hist_it).PC,
                        (*pred_hist_it).tid, (*pred_hist_it).predTaken,
                        (*pred_hist_it).bpHistory);
                pred_hist_it++;
            }

            cprintf("\n");
        }
    }
}