cpu/pred/multiperspective_perceptron.cc

246 MultiperspectivePerceptron::findBest(ThreadID tid,
263         pairs[i].mpreds = threadData[tid]->mpreds[i];
272 MultiperspectivePerceptron::getIndex(ThreadID tid, const MPPBranchInfo &bi,
275     unsigned int g = spec.getHash(tid, bi.getPC(), bi.getPC2(), index);
287         h ^= threadData[tid]->imli_counter[0];
290         h ^= threadData[tid]->imli_counter[3];
294             h ^= RECENCYPOS::hash(threadData[tid]->recency_stack, table_sizes,
303 MultiperspectivePerceptron::computeOutput(ThreadID tid, MPPBranchInfo &bi)
313     int lhist = threadData[tid]->localHistories[bi.getPC()];
314     int history_len = threadData[tid]->localHistories.getLocalHistoryLength();
326     findBest(tid, best_preds);
334         unsigned int hashed_idx = getIndex(tid, bi, spec, i);
336         int counter = threadData[tid]->tables[i][hashed_idx];
339           threadData[tid]->sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
403 MultiperspectivePerceptron::train(ThreadID tid, MPPBranchInfo &bi, bool taken)
405     std::vector<std::vector<short int>> &tables = threadData[tid]->tables;
407             threadData[tid]->sign_bits;
408     std::vector<int> &mpreds = threadData[tid]->mpreds;
421             unsigned int hashed_idx = getIndex(tid, bi, spec, i);
469         unsigned int hashed_idx = getIndex(tid, bi, spec, i);
503                     unsigned int hashed_idx = getIndex(tid, bi, spec, i);
521                     unsigned int hashed_idx = getIndex(tid, bi, spec, i);
544 MultiperspectivePerceptron::uncondBranch(ThreadID tid, Addr pc,
548     std::vector<unsigned int> &ghist_words = threadData[tid]->ghist_words;
560     memmove(&threadData[tid]->path_history[1],
561             &threadData[tid]->path_history[0],
563     threadData[tid]->path_history[0] = pc2;
567 MultiperspectivePerceptron::lookup(ThreadID tid, Addr instPC,
575     if (!threadData[tid]->filterTable.empty()) {
577             bi->getHashFilter(threadData[tid]->last_ghist_bit) %
578             threadData[tid]->filterTable.size();
579         FilterEntry &f = threadData[tid]->filterTable[findex];
594     int bestval = computeOutput(tid, *bi);
609 MultiperspectivePerceptron::update(ThreadID tid, Addr instPC, bool taken,
629     if (!threadData[tid]->filterTable.empty()) {
630         int findex = bi->getHashFilter(threadData[tid]->last_ghist_bit) %
631                                        threadData[tid]->filterTable.size();
632         FilterEntry &f = threadData[tid]->filterTable[findex];
653             threadData[tid]->occupancy += 1;
659             ((threadData[tid]->occupancy > decay) || (decay == 1))) {
661                       threadData[tid]->filterTable.size();
662             FilterEntry &frand = threadData[tid]->filterTable[rnd];
664                 threadData[tid]->occupancy -= 1;
672         train(tid, *bi, taken);
690                 threadData[tid]->imli_counter[0] += 1;
692                 threadData[tid]->imli_counter[0] = 0;
695                 threadData[tid]->imli_counter[1] += 1;
697                 threadData[tid]->imli_counter[1] = 0;
701                 threadData[tid]->imli_counter[2] += 1;
703                 threadData[tid]->imli_counter[2] = 0;
706                 threadData[tid]->imli_counter[3] += 1;
708                 threadData[tid]->imli_counter[3] = 0;
718         assert(threadData[tid]->ghist_words.size() > 0);
720             unsigned int a = threadData[tid]->ghist_words[i];
726             threadData[tid]->ghist_words[i] = a;
732         assert(threadData[tid]->path_history.size() > 0);
733         memmove(&threadData[tid]->path_history[1],
734                 &threadData[tid]->path_history[0],
736         threadData[tid]->path_history[0] = bi->getPC2();
741         threadData[tid]->updateAcyclic(hashed_taken, bi->getHPC());
749                 memmove(&threadData[tid]->modpath_histories[i][1],
750                         &threadData[tid]->modpath_histories[i][0],
752                 threadData[tid]->modpath_histories[i][0] = bi->getPC2();
760              threadData[tid]->blurrypath_histories;
783                     threadData[tid]->mod_histories[i][j] =
784                         threadData[tid]->mod_histories[i][j-1];
786                 threadData[tid]->mod_histories[i][0] = hashed_taken;
794             threadData[tid]->insertRecency(bi->getPC2(), assoc);
800         threadData[tid]->localHistories.update(bi->getPC(), hashed_taken);
804     threadData[tid]->last_ghist_bit = taken;
810 MultiperspectivePerceptron::btbUpdate(ThreadID tid, Addr branch_pc,
816 MultiperspectivePerceptron::squash(ThreadID tid, void *bp_history)