iew_impl.hh revision 2326 
1/*
2 * Copyright (c) 2004-2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29// @todo: Fix the instantaneous communication among all the stages within
30// iew.  There's a clear delay between issue and execute, yet backwards
31// communication happens simultaneously.
32
33#include <queue>
34
35#include "base/timebuf.hh"
36#include "cpu/o3/fu_pool.hh"
37#include "cpu/o3/iew.hh"
38
39using namespace std;
40
41template<class Impl>
42DefaultIEW<Impl>::LdWritebackEvent::LdWritebackEvent(DynInstPtr &_inst,
43                                                     DefaultIEW<Impl> *_iew)
44    : Event(&mainEventQueue), inst(_inst), iewStage(_iew)
45{
46    this->setFlags(Event::AutoDelete);
47}
48
49template<class Impl>
50void
51DefaultIEW<Impl>::LdWritebackEvent::process()
52{
53    DPRINTF(IEW, "Load writeback event [sn:%lli]\n", inst->seqNum);
54    DPRINTF(Activity, "Activity: Ld Writeback event [sn:%lli]\n", inst->seqNum);
55
56    //iewStage->ldstQueue.removeMSHR(inst->threadNumber,inst->seqNum);
57
58    if (iewStage->isSwitchedOut()) {
59        inst = NULL;
60        return;
61    } else if (inst->isSquashed()) {
62        iewStage->wakeCPU();
63        inst = NULL;
64        return;
65    }
66
67    iewStage->wakeCPU();
68
69    if (!inst->isExecuted()) {
70        inst->setExecuted();
71
72        // Complete access to copy data to proper place.
73        if (inst->isStore()) {
74            inst->completeAcc();
75        }
76    }
77
78    // Need to insert instruction into queue to commit
79    iewStage->instToCommit(inst);
80
81    iewStage->activityThisCycle();
82
83    inst = NULL;
84}
85
86template<class Impl>
87const char *
88DefaultIEW<Impl>::LdWritebackEvent::description()
89{
90    return "Load writeback event";
91}
92
93template<class Impl>
94DefaultIEW<Impl>::DefaultIEW(Params *params)
95    : // @todo: Make this into a parameter.
96      issueToExecQueue(5, 5),
97      instQueue(params),
98      ldstQueue(params),
99      fuPool(params->fuPool),
100      commitToIEWDelay(params->commitToIEWDelay),
101      renameToIEWDelay(params->renameToIEWDelay),
102      issueToExecuteDelay(params->issueToExecuteDelay),
103      issueReadWidth(params->issueWidth),
104      issueWidth(params->issueWidth),
105      executeWidth(params->executeWidth),
106      numThreads(params->numberOfThreads),
107      switchedOut(false)
108{
109    _status = Active;
110    exeStatus = Running;
111    wbStatus = Idle;
112
113    // Setup wire to read instructions coming from issue.
114    fromIssue = issueToExecQueue.getWire(-issueToExecuteDelay);
115
116    // Instruction queue needs the queue between issue and execute.
117    instQueue.setIssueToExecuteQueue(&issueToExecQueue);
118
119    instQueue.setIEW(this);
120    ldstQueue.setIEW(this);
121
122    for (int i=0; i < numThreads; i++) {
123        dispatchStatus[i] = Running;
124        stalls[i].commit = false;
125        fetchRedirect[i] = false;
126    }
127
128    updateLSQNextCycle = false;
129
130    skidBufferMax = (3 * (renameToIEWDelay * params->renameWidth)) + issueWidth;
131}
132
133template <class Impl>
134std::string
135DefaultIEW<Impl>::name() const
136{
137    return cpu->name() + ".iew";
138}
139
140template <class Impl>
141void
142DefaultIEW<Impl>::regStats()
143{
144    using namespace Stats;
145
146    instQueue.regStats();
147
148    iewIdleCycles
149        .name(name() + ".iewIdleCycles")
150        .desc("Number of cycles IEW is idle");
151
152    iewSquashCycles
153        .name(name() + ".iewSquashCycles")
154        .desc("Number of cycles IEW is squashing");
155
156    iewBlockCycles
157        .name(name() + ".iewBlockCycles")
158        .desc("Number of cycles IEW is blocking");
159
160    iewUnblockCycles
161        .name(name() + ".iewUnblockCycles")
162        .desc("Number of cycles IEW is unblocking");
163
164    iewDispatchedInsts
165        .name(name() + ".iewDispatchedInsts")
166        .desc("Number of instructions dispatched to IQ");
167
168    iewDispSquashedInsts
169        .name(name() + ".iewDispSquashedInsts")
170        .desc("Number of squashed instructions skipped by dispatch");
171
172    iewDispLoadInsts
173        .name(name() + ".iewDispLoadInsts")
174        .desc("Number of dispatched load instructions");
175
176    iewDispStoreInsts
177        .name(name() + ".iewDispStoreInsts")
178        .desc("Number of dispatched store instructions");
179
180    iewDispNonSpecInsts
181        .name(name() + ".iewDispNonSpecInsts")
182        .desc("Number of dispatched non-speculative instructions");
183
184    iewIQFullEvents
185        .name(name() + ".iewIQFullEvents")
186        .desc("Number of times the IQ has become full, causing a stall");
187
188    iewLSQFullEvents
189        .name(name() + ".iewLSQFullEvents")
190        .desc("Number of times the LSQ has become full, causing a stall");
191
192    iewExecutedInsts
193        .name(name() + ".iewExecutedInsts")
194        .desc("Number of executed instructions");
195
196    iewExecLoadInsts
197        .init(cpu->number_of_threads)
198        .name(name() + ".iewExecLoadInsts")
199        .desc("Number of load instructions executed")
200        .flags(total);
201
202    iewExecSquashedInsts
203        .name(name() + ".iewExecSquashedInsts")
204        .desc("Number of squashed instructions skipped in execute");
205
206    memOrderViolationEvents
207        .name(name() + ".memOrderViolationEvents")
208        .desc("Number of memory order violations");
209
210    predictedTakenIncorrect
211        .name(name() + ".predictedTakenIncorrect")
212        .desc("Number of branches that were predicted taken incorrectly");
213
214    predictedNotTakenIncorrect
215        .name(name() + ".predictedNotTakenIncorrect")
216        .desc("Number of branches that were predicted not taken incorrectly");
217
218    branchMispredicts
219        .name(name() + ".branchMispredicts")
220        .desc("Number of branch mispredicts detected at execute");
221
222    branchMispredicts = predictedTakenIncorrect + predictedNotTakenIncorrect;
223
224    exeSwp
225        .init(cpu->number_of_threads)
226        .name(name() + ".EXEC:swp")
227        .desc("number of swp insts executed")
228        .flags(total)
229        ;
230
231    exeNop
232        .init(cpu->number_of_threads)
233        .name(name() + ".EXEC:nop")
234        .desc("number of nop insts executed")
235        .flags(total)
236        ;
237
238    exeRefs
239        .init(cpu->number_of_threads)
240        .name(name() + ".EXEC:refs")
241        .desc("number of memory reference insts executed")
242        .flags(total)
243        ;
244
245    exeBranches
246        .init(cpu->number_of_threads)
247        .name(name() + ".EXEC:branches")
248        .desc("Number of branches executed")
249        .flags(total)
250        ;
251
252    issueRate
253        .name(name() + ".EXEC:rate")
254        .desc("Inst execution rate")
255        .flags(total)
256        ;
257    issueRate = iewExecutedInsts / cpu->numCycles;
258
259    iewExecStoreInsts
260        .name(name() + ".EXEC:stores")
261        .desc("Number of stores executed")
262        .flags(total)
263        ;
264    iewExecStoreInsts = exeRefs - iewExecLoadInsts;
265/*
266    for (int i=0; i<Num_OpClasses; ++i) {
267        stringstream subname;
268        subname << opClassStrings[i] << "_delay";
269        issue_delay_dist.subname(i, subname.str());
270    }
271*/
272    //
273    //  Other stats
274    //
275
276    iewInstsToCommit
277        .init(cpu->number_of_threads)
278        .name(name() + ".WB:sent")
279        .desc("cumulative count of insts sent to commit")
280        .flags(total)
281        ;
282
283    writebackCount
284        .init(cpu->number_of_threads)
285        .name(name() + ".WB:count")
286        .desc("cumulative count of insts written-back")
287        .flags(total)
288        ;
289
290    producerInst
291        .init(cpu->number_of_threads)
292        .name(name() + ".WB:producers")
293        .desc("num instructions producing a value")
294        .flags(total)
295        ;
296
297    consumerInst
298        .init(cpu->number_of_threads)
299        .name(name() + ".WB:consumers")
300        .desc("num instructions consuming a value")
301        .flags(total)
302        ;
303
304    wbPenalized
305        .init(cpu->number_of_threads)
306        .name(name() + ".WB:penalized")
307        .desc("number of instrctions required to write to 'other' IQ")
308        .flags(total)
309        ;
310
311    wbPenalizedRate
312        .name(name() + ".WB:penalized_rate")
313        .desc ("fraction of instructions written-back that wrote to 'other' IQ")
314        .flags(total)
315        ;
316
317    wbPenalizedRate = wbPenalized / writebackCount;
318
319    wbFanout
320        .name(name() + ".WB:fanout")
321        .desc("average fanout of values written-back")
322        .flags(total)
323        ;
324
325    wbFanout = producerInst / consumerInst;
326
327    wbRate
328        .name(name() + ".WB:rate")
329        .desc("insts written-back per cycle")
330        .flags(total)
331        ;
332    wbRate = writebackCount / cpu->numCycles;
333}
334
335template<class Impl>
336void
337DefaultIEW<Impl>::initStage()
338{
339    for (int tid=0; tid < numThreads; tid++) {
340        toRename->iewInfo[tid].usedIQ = true;
341        toRename->iewInfo[tid].freeIQEntries =
342            instQueue.numFreeEntries(tid);
343
344        toRename->iewInfo[tid].usedLSQ = true;
345        toRename->iewInfo[tid].freeLSQEntries =
346            ldstQueue.numFreeEntries(tid);
347    }
348}
349
350template<class Impl>
351void
352DefaultIEW<Impl>::setCPU(FullCPU *cpu_ptr)
353{
354    DPRINTF(IEW, "Setting CPU pointer.\n");
355    cpu = cpu_ptr;
356
357    instQueue.setCPU(cpu_ptr);
358    ldstQueue.setCPU(cpu_ptr);
359
360    cpu->activateStage(FullCPU::IEWIdx);
361}
362
363template<class Impl>
364void
365DefaultIEW<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr)
366{
367    DPRINTF(IEW, "Setting time buffer pointer.\n");
368    timeBuffer = tb_ptr;
369
370    // Setup wire to read information from time buffer, from commit.
371    fromCommit = timeBuffer->getWire(-commitToIEWDelay);
372
373    // Setup wire to write information back to previous stages.
374    toRename = timeBuffer->getWire(0);
375
376    toFetch = timeBuffer->getWire(0);
377
378    // Instruction queue also needs main time buffer.
379    instQueue.setTimeBuffer(tb_ptr);
380}
381
382template<class Impl>
383void
384DefaultIEW<Impl>::setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr)
385{
386    DPRINTF(IEW, "Setting rename queue pointer.\n");
387    renameQueue = rq_ptr;
388
389    // Setup wire to read information from rename queue.
390    fromRename = renameQueue->getWire(-renameToIEWDelay);
391}
392
393template<class Impl>
394void
395DefaultIEW<Impl>::setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr)
396{
397    DPRINTF(IEW, "Setting IEW queue pointer.\n");
398    iewQueue = iq_ptr;
399
400    // Setup wire to write instructions to commit.
401    toCommit = iewQueue->getWire(0);
402}
403
404template<class Impl>
405void
406DefaultIEW<Impl>::setActiveThreads(list<unsigned> *at_ptr)
407{
408    DPRINTF(IEW, "Setting active threads list pointer.\n");
409    activeThreads = at_ptr;
410
411    ldstQueue.setActiveThreads(at_ptr);
412    instQueue.setActiveThreads(at_ptr);
413}
414
415template<class Impl>
416void
417DefaultIEW<Impl>::setScoreboard(Scoreboard *sb_ptr)
418{
419    DPRINTF(IEW, "Setting scoreboard pointer.\n");
420    scoreboard = sb_ptr;
421}
422
423#if 0
424template<class Impl>
425void
426DefaultIEW<Impl>::setPageTable(PageTable *pt_ptr)
427{
428    ldstQueue.setPageTable(pt_ptr);
429}
430#endif
431
432template <class Impl>
433void
434DefaultIEW<Impl>::switchOut()
435{
436    cpu->signalSwitched();
437}
438
439template <class Impl>
440void
441DefaultIEW<Impl>::doSwitchOut()
442{
443    switchedOut = true;
444
445    instQueue.switchOut();
446    ldstQueue.switchOut();
447    fuPool->switchOut();
448
449    for (int i = 0; i < numThreads; i++) {
450        while (!insts[i].empty())
451            insts[i].pop();
452        while (!skidBuffer[i].empty())
453            skidBuffer[i].pop();
454    }
455}
456
457template <class Impl>
458void
459DefaultIEW<Impl>::takeOverFrom()
460{
461    _status = Active;
462    exeStatus = Running;
463    wbStatus = Idle;
464    switchedOut = false;
465
466    instQueue.takeOverFrom();
467    ldstQueue.takeOverFrom();
468    fuPool->takeOverFrom();
469
470    initStage();
471    cpu->activityThisCycle();
472
473    for (int i=0; i < numThreads; i++) {
474        dispatchStatus[i] = Running;
475        stalls[i].commit = false;
476        fetchRedirect[i] = false;
477    }
478
479    updateLSQNextCycle = false;
480
481    // @todo: Fix hardcoded number
482    for (int i = 0; i < 6; ++i) {
483        issueToExecQueue.advance();
484    }
485}
486
487template<class Impl>
488void
489DefaultIEW<Impl>::squash(unsigned tid)
490{
491    DPRINTF(IEW, "[tid:%i]: Squashing all instructions.\n",
492            tid);
493
494    // Tell the IQ to start squashing.
495    instQueue.squash(tid);
496
497    // Tell the LDSTQ to start squashing.
498    ldstQueue.squash(fromCommit->commitInfo[tid].doneSeqNum, tid);
499
500    updatedQueues = true;
501
502    // Clear the skid buffer in case it has any data in it.
503    while (!skidBuffer[tid].empty()) {
504
505        if (skidBuffer[tid].front()->isLoad() ||
506            skidBuffer[tid].front()->isStore() ) {
507            toRename->iewInfo[tid].dispatchedToLSQ++;
508        }
509
510        toRename->iewInfo[tid].dispatched++;
511
512        skidBuffer[tid].pop();
513    }
514
515    while (!insts[tid].empty()) {
516        if (insts[tid].front()->isLoad() ||
517            insts[tid].front()->isStore() ) {
518            toRename->iewInfo[tid].dispatchedToLSQ++;
519        }
520
521        toRename->iewInfo[tid].dispatched++;
522
523        insts[tid].pop();
524    }
525}
526
527template<class Impl>
528void
529DefaultIEW<Impl>::squashDueToBranch(DynInstPtr &inst, unsigned tid)
530{
531    DPRINTF(IEW, "[tid:%i]: Squashing from a specific instruction, PC: %#x "
532            "[sn:%i].\n", tid, inst->readPC(), inst->seqNum);
533
534    toCommit->squash[tid] = true;
535    toCommit->squashedSeqNum[tid] = inst->seqNum;
536    toCommit->mispredPC[tid] = inst->readPC();
537    toCommit->nextPC[tid] = inst->readNextPC();
538    toCommit->branchMispredict[tid] = true;
539    toCommit->branchTaken[tid] = inst->readNextPC() !=
540        (inst->readPC() + sizeof(TheISA::MachInst));
541
542    toCommit->includeSquashInst[tid] = false;
543
544    wroteToTimeBuffer = true;
545}
546
547template<class Impl>
548void
549DefaultIEW<Impl>::squashDueToMemOrder(DynInstPtr &inst, unsigned tid)
550{
551    DPRINTF(IEW, "[tid:%i]: Squashing from a specific instruction, "
552            "PC: %#x [sn:%i].\n", tid, inst->readPC(), inst->seqNum);
553
554    toCommit->squash[tid] = true;
555    toCommit->squashedSeqNum[tid] = inst->seqNum;
556    toCommit->nextPC[tid] = inst->readNextPC();
557
558    toCommit->includeSquashInst[tid] = false;
559
560    wroteToTimeBuffer = true;
561}
562
563template<class Impl>
564void
565DefaultIEW<Impl>::squashDueToMemBlocked(DynInstPtr &inst, unsigned tid)
566{
567    DPRINTF(IEW, "[tid:%i]: Memory blocked, squashing load and younger insts, "
568            "PC: %#x [sn:%i].\n", tid, inst->readPC(), inst->seqNum);
569
570    toCommit->squash[tid] = true;
571    toCommit->squashedSeqNum[tid] = inst->seqNum;
572    toCommit->nextPC[tid] = inst->readPC();
573
574    toCommit->includeSquashInst[tid] = true;
575
576    ldstQueue.setLoadBlockedHandled(tid);
577
578    wroteToTimeBuffer = true;
579}
580
581template<class Impl>
582void
583DefaultIEW<Impl>::block(unsigned tid)
584{
585    DPRINTF(IEW, "[tid:%u]: Blocking.\n", tid);
586
587    if (dispatchStatus[tid] != Blocked &&
588        dispatchStatus[tid] != Unblocking) {
589        toRename->iewBlock[tid] = true;
590        wroteToTimeBuffer = true;
591    }
592
593    // Add the current inputs to the skid buffer so they can be
594    // reprocessed when this stage unblocks.
595    skidInsert(tid);
596
597    dispatchStatus[tid] = Blocked;
598}
599
600template<class Impl>
601void
602DefaultIEW<Impl>::unblock(unsigned tid)
603{
604    DPRINTF(IEW, "[tid:%i]: Reading instructions out of the skid "
605            "buffer %u.\n",tid, tid);
606
607    // If the skid bufffer is empty, signal back to previous stages to unblock.
608    // Also switch status to running.
609    if (skidBuffer[tid].empty()) {
610        toRename->iewUnblock[tid] = true;
611        wroteToTimeBuffer = true;
612        DPRINTF(IEW, "[tid:%i]: Done unblocking.\n",tid);
613        dispatchStatus[tid] = Running;
614    }
615}
616
617template<class Impl>
618void
619DefaultIEW<Impl>::wakeDependents(DynInstPtr &inst)
620{
621    instQueue.wakeDependents(inst);
622}
623
624template<class Impl>
625void
626DefaultIEW<Impl>::rescheduleMemInst(DynInstPtr &inst)
627{
628    instQueue.rescheduleMemInst(inst);
629}
630
631template<class Impl>
632void
633DefaultIEW<Impl>::replayMemInst(DynInstPtr &inst)
634{
635    instQueue.replayMemInst(inst);
636}
637
638template<class Impl>
639void
640DefaultIEW<Impl>::instToCommit(DynInstPtr &inst)
641{
642    // First check the time slot that this instruction will write
643    // to.  If there are free write ports at the time, then go ahead
644    // and write the instruction to that time.  If there are not,
645    // keep looking back to see where's the first time there's a
646    // free slot.
647    while ((*iewQueue)[wbCycle].insts[wbNumInst]) {
648        ++wbNumInst;
649        if (wbNumInst == issueWidth) {
650            ++wbCycle;
651            wbNumInst = 0;
652        }
653
654        assert(wbCycle < 5);
655    }
656
657    // Add finished instruction to queue to commit.
658    (*iewQueue)[wbCycle].insts[wbNumInst] = inst;
659    (*iewQueue)[wbCycle].size++;
660}
661
662template <class Impl>
663unsigned
664DefaultIEW<Impl>::validInstsFromRename()
665{
666    unsigned inst_count = 0;
667
668    for (int i=0; i<fromRename->size; i++) {
669        if (!fromRename->insts[i]->squashed)
670            inst_count++;
671    }
672
673    return inst_count;
674}
675
676template<class Impl>
677void
678DefaultIEW<Impl>::skidInsert(unsigned tid)
679{
680    DynInstPtr inst = NULL;
681
682    while (!insts[tid].empty()) {
683        inst = insts[tid].front();
684
685        insts[tid].pop();
686
687        DPRINTF(Decode,"[tid:%i]: Inserting [sn:%lli] PC:%#x into "
688                "dispatch skidBuffer %i\n",tid, inst->seqNum,
689                inst->readPC(),tid);
690
691        skidBuffer[tid].push(inst);
692    }
693
694    assert(skidBuffer[tid].size() <= skidBufferMax &&
695           "Skidbuffer Exceeded Max Size");
696}
697
698template<class Impl>
699int
700DefaultIEW<Impl>::skidCount()
701{
702    int max=0;
703
704    list<unsigned>::iterator threads = (*activeThreads).begin();
705
706    while (threads != (*activeThreads).end()) {
707        unsigned thread_count = skidBuffer[*threads++].size();
708        if (max < thread_count)
709            max = thread_count;
710    }
711
712    return max;
713}
714
715template<class Impl>
716bool
717DefaultIEW<Impl>::skidsEmpty()
718{
719    list<unsigned>::iterator threads = (*activeThreads).begin();
720
721    while (threads != (*activeThreads).end()) {
722        if (!skidBuffer[*threads++].empty())
723            return false;
724    }
725
726    return true;
727}
728
729template <class Impl>
730void
731DefaultIEW<Impl>::updateStatus()
732{
733    bool any_unblocking = false;
734
735    list<unsigned>::iterator threads = (*activeThreads).begin();
736
737    threads = (*activeThreads).begin();
738
739    while (threads != (*activeThreads).end()) {
740        unsigned tid = *threads++;
741
742        if (dispatchStatus[tid] == Unblocking) {
743            any_unblocking = true;
744            break;
745        }
746    }
747
748    // If there are no ready instructions waiting to be scheduled by the IQ,
749    // and there's no stores waiting to write back, and dispatch is not
750    // unblocking, then there is no internal activity for the IEW stage.
751    if (_status == Active && !instQueue.hasReadyInsts() &&
752        !ldstQueue.willWB() && !any_unblocking) {
753        DPRINTF(IEW, "IEW switching to idle\n");
754
755        deactivateStage();
756
757        _status = Inactive;
758    } else if (_status == Inactive && (instQueue.hasReadyInsts() ||
759                                       ldstQueue.willWB() ||
760                                       any_unblocking)) {
761        // Otherwise there is internal activity.  Set to active.
762        DPRINTF(IEW, "IEW switching to active\n");
763
764        activateStage();
765
766        _status = Active;
767    }
768}
769
770template <class Impl>
771void
772DefaultIEW<Impl>::resetEntries()
773{
774    instQueue.resetEntries();
775    ldstQueue.resetEntries();
776}
777
778template <class Impl>
779void
780DefaultIEW<Impl>::readStallSignals(unsigned tid)
781{
782    if (fromCommit->commitBlock[tid]) {
783        stalls[tid].commit = true;
784    }
785
786    if (fromCommit->commitUnblock[tid]) {
787        assert(stalls[tid].commit);
788        stalls[tid].commit = false;
789    }
790}
791
792template <class Impl>
793bool
794DefaultIEW<Impl>::checkStall(unsigned tid)
795{
796    bool ret_val(false);
797
798    if (stalls[tid].commit) {
799        DPRINTF(IEW,"[tid:%i]: Stall from Commit stage detected.\n",tid);
800        ret_val = true;
801    } else if (instQueue.isFull(tid)) {
802        DPRINTF(IEW,"[tid:%i]: Stall: IQ  is full.\n",tid);
803        ret_val = true;
804    } else if (ldstQueue.isFull(tid)) {
805        DPRINTF(IEW,"[tid:%i]: Stall: LSQ is full\n",tid);
806
807        if (ldstQueue.numLoads(tid) > 0 ) {
808
809            DPRINTF(IEW,"[tid:%i]: LSQ oldest load: [sn:%i] \n",
810                    tid,ldstQueue.getLoadHeadSeqNum(tid));
811        }
812
813        if (ldstQueue.numStores(tid) > 0) {
814
815            DPRINTF(IEW,"[tid:%i]: LSQ oldest store: [sn:%i] \n",
816                    tid,ldstQueue.getStoreHeadSeqNum(tid));
817        }
818
819        ret_val = true;
820    } else if (ldstQueue.isStalled(tid)) {
821        DPRINTF(IEW,"[tid:%i]: Stall: LSQ stall detected.\n",tid);
822        ret_val = true;
823    }
824
825    return ret_val;
826}
827
828template <class Impl>
829void
830DefaultIEW<Impl>::checkSignalsAndUpdate(unsigned tid)
831{
832    // Check if there's a squash signal, squash if there is
833    // Check stall signals, block if there is.
834    // If status was Blocked
835    //     if so then go to unblocking
836    // If status was Squashing
837    //     check if squashing is not high.  Switch to running this cycle.
838
839    readStallSignals(tid);
840
841    if (fromCommit->commitInfo[tid].squash) {
842        squash(tid);
843
844        if (dispatchStatus[tid] == Blocked ||
845            dispatchStatus[tid] == Unblocking) {
846            toRename->iewUnblock[tid] = true;
847            wroteToTimeBuffer = true;
848        }
849
850        dispatchStatus[tid] = Squashing;
851
852        fetchRedirect[tid] = false;
853        return;
854    }
855
856    if (fromCommit->commitInfo[tid].robSquashing) {
857        DPRINTF(IEW, "[tid:%i]: ROB is still squashing.\n");
858
859        dispatchStatus[tid] = Squashing;
860
861        return;
862    }
863
864    if (checkStall(tid)) {
865        block(tid);
866        dispatchStatus[tid] = Blocked;
867        return;
868    }
869
870    if (dispatchStatus[tid] == Blocked) {
871        // Status from previous cycle was blocked, but there are no more stall
872        // conditions.  Switch over to unblocking.
873        DPRINTF(IEW, "[tid:%i]: Done blocking, switching to unblocking.\n",
874                tid);
875
876        dispatchStatus[tid] = Unblocking;
877
878        unblock(tid);
879
880        return;
881    }
882
883    if (dispatchStatus[tid] == Squashing) {
884        // Switch status to running if rename isn't being told to block or
885        // squash this cycle.
886        DPRINTF(IEW, "[tid:%i]: Done squashing, switching to running.\n",
887                tid);
888
889        dispatchStatus[tid] = Running;
890
891        return;
892    }
893}
894
895template <class Impl>
896void
897DefaultIEW<Impl>::sortInsts()
898{
899    int insts_from_rename = fromRename->size;
900#ifdef DEBUG
901    for (int i = 0; i < numThreads; i++)
902        assert(insts[i].empty());
903#endif
904    for (int i = 0; i < insts_from_rename; ++i) {
905        insts[fromRename->insts[i]->threadNumber].push(fromRename->insts[i]);
906    }
907}
908
909template <class Impl>
910void
911DefaultIEW<Impl>::wakeCPU()
912{
913    cpu->wakeCPU();
914}
915
916template <class Impl>
917void
918DefaultIEW<Impl>::activityThisCycle()
919{
920    DPRINTF(Activity, "Activity this cycle.\n");
921    cpu->activityThisCycle();
922}
923
924template <class Impl>
925inline void
926DefaultIEW<Impl>::activateStage()
927{
928    DPRINTF(Activity, "Activating stage.\n");
929    cpu->activateStage(FullCPU::IEWIdx);
930}
931
932template <class Impl>
933inline void
934DefaultIEW<Impl>::deactivateStage()
935{
936    DPRINTF(Activity, "Deactivating stage.\n");
937    cpu->deactivateStage(FullCPU::IEWIdx);
938}
939
940template<class Impl>
941void
942DefaultIEW<Impl>::dispatch(unsigned tid)
943{
944    // If status is Running or idle,
945    //     call dispatchInsts()
946    // If status is Unblocking,
947    //     buffer any instructions coming from rename
948    //     continue trying to empty skid buffer
949    //     check if stall conditions have passed
950
951    if (dispatchStatus[tid] == Blocked) {
952        ++iewBlockCycles;
953
954    } else if (dispatchStatus[tid] == Squashing) {
955        ++iewSquashCycles;
956    }
957
958    // Dispatch should try to dispatch as many instructions as its bandwidth
959    // will allow, as long as it is not currently blocked.
960    if (dispatchStatus[tid] == Running ||
961        dispatchStatus[tid] == Idle) {
962        DPRINTF(IEW, "[tid:%i] Not blocked, so attempting to run "
963                "dispatch.\n", tid);
964
965        dispatchInsts(tid);
966    } else if (dispatchStatus[tid] == Unblocking) {
967        // Make sure that the skid buffer has something in it if the
968        // status is unblocking.
969        assert(!skidsEmpty());
970
971        // If the status was unblocking, then instructions from the skid
972        // buffer were used.  Remove those instructions and handle
973        // the rest of unblocking.
974        dispatchInsts(tid);
975
976        ++iewUnblockCycles;
977
978        if (validInstsFromRename() && dispatchedAllInsts) {
979            // Add the current inputs to the skid buffer so they can be
980            // reprocessed when this stage unblocks.
981            skidInsert(tid);
982        }
983
984        unblock(tid);
985    }
986}
987
988template <class Impl>
989void
990DefaultIEW<Impl>::dispatchInsts(unsigned tid)
991{
992    dispatchedAllInsts = true;
993
994    // Obtain instructions from skid buffer if unblocking, or queue from rename
995    // otherwise.
996    std::queue<DynInstPtr> &insts_to_dispatch =
997        dispatchStatus[tid] == Unblocking ?
998        skidBuffer[tid] : insts[tid];
999
1000    int insts_to_add = insts_to_dispatch.size();
1001
1002    DynInstPtr inst;
1003    bool add_to_iq = false;
1004    int dis_num_inst = 0;
1005
1006    // Loop through the instructions, putting them in the instruction
1007    // queue.
1008    for ( ; dis_num_inst < insts_to_add &&
1009              dis_num_inst < issueReadWidth;
1010          ++dis_num_inst)
1011    {
1012        inst = insts_to_dispatch.front();
1013
1014        if (dispatchStatus[tid] == Unblocking) {
1015            DPRINTF(IEW, "[tid:%i]: Issue: Examining instruction from skid "
1016                    "buffer\n", tid);
1017        }
1018
1019        // Make sure there's a valid instruction there.
1020        assert(inst);
1021
1022        DPRINTF(IEW, "[tid:%i]: Issue: Adding PC %#x [sn:%lli] [tid:%i] to "
1023                "IQ.\n",
1024                tid, inst->readPC(), inst->seqNum, inst->threadNumber);
1025
1026        // Be sure to mark these instructions as ready so that the
1027        // commit stage can go ahead and execute them, and mark
1028        // them as issued so the IQ doesn't reprocess them.
1029
1030        // Check for squashed instructions.
1031        if (inst->isSquashed()) {
1032            DPRINTF(IEW, "[tid:%i]: Issue: Squashed instruction encountered, "
1033                    "not adding to IQ.\n", tid);
1034
1035            ++iewDispSquashedInsts;
1036
1037            insts_to_dispatch.pop();
1038
1039            //Tell Rename That An Instruction has been processed
1040            if (inst->isLoad() || inst->isStore()) {
1041                toRename->iewInfo[tid].dispatchedToLSQ++;
1042            }
1043            toRename->iewInfo[tid].dispatched++;
1044
1045            continue;
1046        }
1047
1048        // Check for full conditions.
1049        if (instQueue.isFull(tid)) {
1050            DPRINTF(IEW, "[tid:%i]: Issue: IQ has become full.\n", tid);
1051
1052            // Call function to start blocking.
1053            block(tid);
1054
1055            // Set unblock to false. Special case where we are using
1056            // skidbuffer (unblocking) instructions but then we still
1057            // get full in the IQ.
1058            toRename->iewUnblock[tid] = false;
1059
1060            dispatchedAllInsts = false;
1061
1062            ++iewIQFullEvents;
1063            break;
1064        } else if (ldstQueue.isFull(tid)) {
1065            DPRINTF(IEW, "[tid:%i]: Issue: LSQ has become full.\n",tid);
1066
1067            // Call function to start blocking.
1068            block(tid);
1069
1070            // Set unblock to false. Special case where we are using
1071            // skidbuffer (unblocking) instructions but then we still
1072            // get full in the IQ.
1073            toRename->iewUnblock[tid] = false;
1074
1075            dispatchedAllInsts = false;
1076
1077            ++iewLSQFullEvents;
1078            break;
1079        }
1080
1081        // Otherwise issue the instruction just fine.
1082        if (inst->isLoad()) {
1083            DPRINTF(IEW, "[tid:%i]: Issue: Memory instruction "
1084                    "encountered, adding to LSQ.\n", tid);
1085
1086            // Reserve a spot in the load store queue for this
1087            // memory access.
1088            ldstQueue.insertLoad(inst);
1089
1090            ++iewDispLoadInsts;
1091
1092            add_to_iq = true;
1093
1094            toRename->iewInfo[tid].dispatchedToLSQ++;
1095        } else if (inst->isStore()) {
1096            DPRINTF(IEW, "[tid:%i]: Issue: Memory instruction "
1097                    "encountered, adding to LSQ.\n", tid);
1098
1099            ldstQueue.insertStore(inst);
1100
1101            ++iewDispStoreInsts;
1102
1103            if (inst->isNonSpeculative()) {
1104                // Non-speculative stores (namely store conditionals)
1105                // need to be set as "canCommit()" so that commit can
1106                // process them when they reach the head of commit.
1107                inst->setCanCommit();
1108                instQueue.insertNonSpec(inst);
1109                add_to_iq = false;
1110
1111                ++iewDispNonSpecInsts;
1112            } else {
1113                add_to_iq = true;
1114            }
1115
1116            toRename->iewInfo[tid].dispatchedToLSQ++;
1117#if FULL_SYSTEM
1118        } else if (inst->isMemBarrier() || inst->isWriteBarrier()) {
1119            // Same as non-speculative stores.
1120            inst->setCanCommit();
1121            instQueue.insertBarrier(inst);
1122            add_to_iq = false;
1123#endif
1124        } else if (inst->isNonSpeculative()) {
1125            DPRINTF(IEW, "[tid:%i]: Issue: Nonspeculative instruction "
1126                    "encountered, skipping.\n", tid);
1127
1128            // Same as non-speculative stores.
1129            inst->setCanCommit();
1130
1131            // Specifically insert it as nonspeculative.
1132            instQueue.insertNonSpec(inst);
1133
1134            ++iewDispNonSpecInsts;
1135
1136            add_to_iq = false;
1137        } else if (inst->isNop()) {
1138            DPRINTF(IEW, "[tid:%i]: Issue: Nop instruction encountered, "
1139                    "skipping.\n", tid);
1140
1141            inst->setIssued();
1142            inst->setExecuted();
1143            inst->setCanCommit();
1144
1145            instQueue.recordProducer(inst);
1146
1147            exeNop[tid]++;
1148
1149            add_to_iq = false;
1150        } else if (inst->isExecuted()) {
1151            assert(0 && "Instruction shouldn't be executed.\n");
1152            DPRINTF(IEW, "Issue: Executed branch encountered, "
1153                    "skipping.\n");
1154
1155            inst->setIssued();
1156            inst->setCanCommit();
1157
1158            instQueue.recordProducer(inst);
1159
1160            add_to_iq = false;
1161        } else {
1162            add_to_iq = true;
1163        }
1164
1165        // If the instruction queue is not full, then add the
1166        // instruction.
1167        if (add_to_iq) {
1168            instQueue.insert(inst);
1169        }
1170
1171        insts_to_dispatch.pop();
1172
1173        toRename->iewInfo[tid].dispatched++;
1174
1175        ++iewDispatchedInsts;
1176    }
1177
1178    if (!insts_to_dispatch.empty()) {
1179        DPRINTF(IEW,"[tid:%i]: Issue: Bandwidth Full. Blocking.\n");
1180        block(tid);
1181        toRename->iewUnblock[tid] = false;
1182    }
1183
1184    if (dispatchStatus[tid] == Idle && dis_num_inst) {
1185        dispatchStatus[tid] = Running;
1186
1187        updatedQueues = true;
1188    }
1189
1190    dis_num_inst = 0;
1191}
1192
1193template <class Impl>
1194void
1195DefaultIEW<Impl>::printAvailableInsts()
1196{
1197    int inst = 0;
1198
1199    cout << "Available Instructions: ";
1200
1201    while (fromIssue->insts[inst]) {
1202
1203        if (inst%3==0) cout << "\n\t";
1204
1205        cout << "PC: " << fromIssue->insts[inst]->readPC()
1206             << " TN: " << fromIssue->insts[inst]->threadNumber
1207             << " SN: " << fromIssue->insts[inst]->seqNum << " | ";
1208
1209        inst++;
1210
1211    }
1212
1213    cout << "\n";
1214}
1215
1216template <class Impl>
1217void
1218DefaultIEW<Impl>::executeInsts()
1219{
1220    wbNumInst = 0;
1221    wbCycle = 0;
1222
1223    list<unsigned>::iterator threads = (*activeThreads).begin();
1224
1225    while (threads != (*activeThreads).end()) {
1226        unsigned tid = *threads++;
1227        fetchRedirect[tid] = false;
1228    }
1229
1230#if 0
1231    printAvailableInsts();
1232#endif
1233
1234    // Execute/writeback any instructions that are available.
1235    int inst_num = 0;
1236    for ( ; inst_num < issueWidth && fromIssue->insts[inst_num];
1237          ++inst_num) {
1238
1239        DPRINTF(IEW, "Execute: Executing instructions from IQ.\n");
1240
1241        DynInstPtr inst = fromIssue->insts[inst_num];
1242
1243        DPRINTF(IEW, "Execute: Processing PC %#x, [tid:%i] [sn:%i].\n",
1244                inst->readPC(), inst->threadNumber,inst->seqNum);
1245
1246        // Check if the instruction is squashed; if so then skip it
1247        if (inst->isSquashed()) {
1248            DPRINTF(IEW, "Execute: Instruction was squashed.\n");
1249
1250            // Consider this instruction executed so that commit can go
1251            // ahead and retire the instruction.
1252            inst->setExecuted();
1253
1254            // Not sure if I should set this here or just let commit try to
1255            // commit any squashed instructions.  I like the latter a bit more.
1256            inst->setCanCommit();
1257
1258            ++iewExecSquashedInsts;
1259
1260            continue;
1261        }
1262
1263        Fault fault = NoFault;
1264
1265        // Execute instruction.
1266        // Note that if the instruction faults, it will be handled
1267        // at the commit stage.
1268        if (inst->isMemRef() &&
1269            (!inst->isDataPrefetch() && !inst->isInstPrefetch())) {
1270            DPRINTF(IEW, "Execute: Calculating address for memory "
1271                    "reference.\n");
1272
1273            // Tell the LDSTQ to execute this instruction (if it is a load).
1274            if (inst->isLoad()) {
1275                // Loads will mark themselves as executed, and their writeback
1276                // event adds the instruction to the queue to commit
1277                fault = ldstQueue.executeLoad(inst);
1278            } else if (inst->isStore()) {
1279                ldstQueue.executeStore(inst);
1280
1281                // If the store had a fault then it may not have a mem req
1282                if (inst->req && !(inst->req->flags & LOCKED)) {
1283                    inst->setExecuted();
1284
1285                    instToCommit(inst);
1286                }
1287
1288                // Store conditionals will mark themselves as
1289                // executed, and their writeback event will add the
1290                // instruction to the queue to commit.
1291            } else {
1292                panic("Unexpected memory type!\n");
1293            }
1294
1295        } else {
1296            inst->execute();
1297
1298            inst->setExecuted();
1299
1300            instToCommit(inst);
1301        }
1302
1303        updateExeInstStats(inst);
1304
1305        // Check if branch prediction was correct, if not then we need
1306        // to tell commit to squash in flight instructions.  Only
1307        // handle this if there hasn't already been something that
1308        // redirects fetch in this group of instructions.
1309
1310        // This probably needs to prioritize the redirects if a different
1311        // scheduler is used.  Currently the scheduler schedules the oldest
1312        // instruction first, so the branch resolution order will be correct.
1313        unsigned tid = inst->threadNumber;
1314
1315        if (!fetchRedirect[tid]) {
1316
1317            if (inst->mispredicted()) {
1318                fetchRedirect[tid] = true;
1319
1320                DPRINTF(IEW, "Execute: Branch mispredict detected.\n");
1321                DPRINTF(IEW, "Execute: Redirecting fetch to PC: %#x.\n",
1322                        inst->nextPC);
1323
1324                // If incorrect, then signal the ROB that it must be squashed.
1325                squashDueToBranch(inst, tid);
1326
1327                if (inst->predTaken()) {
1328                    predictedTakenIncorrect++;
1329                } else {
1330                    predictedNotTakenIncorrect++;
1331                }
1332            } else if (ldstQueue.violation(tid)) {
1333                fetchRedirect[tid] = true;
1334
1335                // If there was an ordering violation, then get the
1336                // DynInst that caused the violation.  Note that this
1337                // clears the violation signal.
1338                DynInstPtr violator;
1339                violator = ldstQueue.getMemDepViolator(tid);
1340
1341                DPRINTF(IEW, "LDSTQ detected a violation.  Violator PC: "
1342                        "%#x, inst PC: %#x.  Addr is: %#x.\n",
1343                        violator->readPC(), inst->readPC(), inst->physEffAddr);
1344
1345                // Tell the instruction queue that a violation has occured.
1346                instQueue.violation(inst, violator);
1347
1348                // Squash.
1349                squashDueToMemOrder(inst,tid);
1350
1351                ++memOrderViolationEvents;
1352            } else if (ldstQueue.loadBlocked(tid) &&
1353                       !ldstQueue.isLoadBlockedHandled(tid)) {
1354                fetchRedirect[tid] = true;
1355
1356                DPRINTF(IEW, "Load operation couldn't execute because the "
1357                        "memory system is blocked.  PC: %#x [sn:%lli]\n",
1358                        inst->readPC(), inst->seqNum);
1359
1360                squashDueToMemBlocked(inst, tid);
1361            }
1362        }
1363    }
1364
1365    if (inst_num) {
1366        if (exeStatus == Idle) {
1367            exeStatus = Running;
1368        }
1369
1370        updatedQueues = true;
1371
1372        cpu->activityThisCycle();
1373    }
1374
1375    // Need to reset this in case a writeback event needs to write into the
1376    // iew queue.  That way the writeback event will write into the correct
1377    // spot in the queue.
1378    wbNumInst = 0;
1379}
1380
1381template <class Impl>
1382void
1383DefaultIEW<Impl>::writebackInsts()
1384{
1385    // Loop through the head of the time buffer and wake any
1386    // dependents.  These instructions are about to write back.  Also
1387    // mark scoreboard that this instruction is finally complete.
1388    // Either have IEW have direct access to scoreboard, or have this
1389    // as part of backwards communication.
1390    for (int inst_num = 0; inst_num < issueWidth &&
1391             toCommit->insts[inst_num]; inst_num++) {
1392        DynInstPtr inst = toCommit->insts[inst_num];
1393        int tid = inst->threadNumber;
1394
1395        DPRINTF(IEW, "Sending instructions to commit, PC %#x.\n",
1396                inst->readPC());
1397
1398        iewInstsToCommit[tid]++;
1399
1400        // Some instructions will be sent to commit without having
1401        // executed because they need commit to handle them.
1402        // E.g. Uncached loads have not actually executed when they
1403        // are first sent to commit.  Instead commit must tell the LSQ
1404        // when it's ready to execute the uncached load.
1405        if (!inst->isSquashed() && inst->isExecuted()) {
1406            int dependents = instQueue.wakeDependents(inst);
1407
1408            for (int i = 0; i < inst->numDestRegs(); i++) {
1409                //mark as Ready
1410                DPRINTF(IEW,"Setting Destination Register %i\n",
1411                        inst->renamedDestRegIdx(i));
1412                scoreboard->setReg(inst->renamedDestRegIdx(i));
1413            }
1414
1415            producerInst[tid]++;
1416            consumerInst[tid]+= dependents;
1417            writebackCount[tid]++;
1418        }
1419    }
1420}
1421
1422template<class Impl>
1423void
1424DefaultIEW<Impl>::tick()
1425{
1426    wbNumInst = 0;
1427    wbCycle = 0;
1428
1429    wroteToTimeBuffer = false;
1430    updatedQueues = false;
1431
1432    sortInsts();
1433
1434    // Free function units marked as being freed this cycle.
1435    fuPool->processFreeUnits();
1436
1437    list<unsigned>::iterator threads = (*activeThreads).begin();
1438
1439    // Check stall and squash signals, dispatch any instructions.
1440    while (threads != (*activeThreads).end()) {
1441           unsigned tid = *threads++;
1442
1443        DPRINTF(IEW,"Issue: Processing [tid:%i]\n",tid);
1444
1445        checkSignalsAndUpdate(tid);
1446        dispatch(tid);
1447    }
1448
1449    if (exeStatus != Squashing) {
1450        executeInsts();
1451
1452        writebackInsts();
1453
1454        // Have the instruction queue try to schedule any ready instructions.
1455        // (In actuality, this scheduling is for instructions that will
1456        // be executed next cycle.)
1457        instQueue.scheduleReadyInsts();
1458
1459        // Also should advance its own time buffers if the stage ran.
1460        // Not the best place for it, but this works (hopefully).
1461        issueToExecQueue.advance();
1462    }
1463
1464    bool broadcast_free_entries = false;
1465
1466    if (updatedQueues || exeStatus == Running || updateLSQNextCycle) {
1467        exeStatus = Idle;
1468        updateLSQNextCycle = false;
1469
1470        broadcast_free_entries = true;
1471    }
1472
1473    // Writeback any stores using any leftover bandwidth.
1474    ldstQueue.writebackStores();
1475
1476    // Check the committed load/store signals to see if there's a load
1477    // or store to commit.  Also check if it's being told to execute a
1478    // nonspeculative instruction.
1479    // This is pretty inefficient...
1480
1481    threads = (*activeThreads).begin();
1482    while (threads != (*activeThreads).end()) {
1483        unsigned tid = (*threads++);
1484
1485        DPRINTF(IEW,"Processing [tid:%i]\n",tid);
1486
1487        if (fromCommit->commitInfo[tid].doneSeqNum != 0 &&
1488            !fromCommit->commitInfo[tid].squash &&
1489            !fromCommit->commitInfo[tid].robSquashing) {
1490
1491            ldstQueue.commitStores(fromCommit->commitInfo[tid].doneSeqNum,tid);
1492
1493            ldstQueue.commitLoads(fromCommit->commitInfo[tid].doneSeqNum,tid);
1494
1495            updateLSQNextCycle = true;
1496            instQueue.commit(fromCommit->commitInfo[tid].doneSeqNum,tid);
1497        }
1498
1499        if (fromCommit->commitInfo[tid].nonSpecSeqNum != 0) {
1500
1501            //DPRINTF(IEW,"NonspecInst from thread %i",tid);
1502            if (fromCommit->commitInfo[tid].uncached) {
1503                instQueue.replayMemInst(fromCommit->commitInfo[tid].uncachedLoad);
1504            } else {
1505                instQueue.scheduleNonSpec(
1506                    fromCommit->commitInfo[tid].nonSpecSeqNum);
1507            }
1508        }
1509
1510        if (broadcast_free_entries) {
1511            toFetch->iewInfo[tid].iqCount =
1512                instQueue.getCount(tid);
1513            toFetch->iewInfo[tid].ldstqCount =
1514                ldstQueue.getCount(tid);
1515
1516            toRename->iewInfo[tid].usedIQ = true;
1517            toRename->iewInfo[tid].freeIQEntries =
1518                instQueue.numFreeEntries();
1519            toRename->iewInfo[tid].usedLSQ = true;
1520            toRename->iewInfo[tid].freeLSQEntries =
1521                ldstQueue.numFreeEntries(tid);
1522
1523            wroteToTimeBuffer = true;
1524        }
1525
1526        DPRINTF(IEW, "[tid:%i], Dispatch dispatched %i instructions.\n",
1527                tid, toRename->iewInfo[tid].dispatched);
1528    }
1529
1530    DPRINTF(IEW, "IQ has %i free entries (Can schedule: %i).  "
1531            "LSQ has %i free entries.\n",
1532            instQueue.numFreeEntries(), instQueue.hasReadyInsts(),
1533            ldstQueue.numFreeEntries());
1534
1535    updateStatus();
1536
1537    if (wroteToTimeBuffer) {
1538        DPRINTF(Activity, "Activity this cycle.\n");
1539        cpu->activityThisCycle();
1540    }
1541}
1542
1543template <class Impl>
1544void
1545DefaultIEW<Impl>::updateExeInstStats(DynInstPtr &inst)
1546{
1547    int thread_number = inst->threadNumber;
1548
1549    //
1550    //  Pick off the software prefetches
1551    //
1552#ifdef TARGET_ALPHA
1553    if (inst->isDataPrefetch())
1554        exeSwp[thread_number]++;
1555    else
1556        iewExecutedInsts++;
1557#else
1558    iewExecutedInsts[thread_number]++;
1559#endif
1560
1561    //
1562    //  Control operations
1563    //
1564    if (inst->isControl())
1565        exeBranches[thread_number]++;
1566
1567    //
1568    //  Memory operations
1569    //
1570    if (inst->isMemRef()) {
1571        exeRefs[thread_number]++;
1572
1573        if (inst->isLoad()) {
1574            iewExecLoadInsts[thread_number]++;
1575        }
1576    }
1577}
1578