cpu/pred/multiperspective_perceptron.cc

272 MultiperspectivePerceptron::getIndex(ThreadID tid, const MPPBranchInfo &bi,
275     unsigned int g = spec.getHash(tid, bi.getPC(), bi.getPC2(), index);
280         h ^= bi.getPC2();
283         h ^= bi.getHPC();
295                     bi.getPC2(), 31, index);
303 MultiperspectivePerceptron::computeOutput(ThreadID tid, MPPBranchInfo &bi)
309     bi.yout = 0;
313     int lhist = threadData[tid]->localHistories[bi.getPC()];
316         bi.yout = bias0;
318         bi.yout = bias1;
320         bi.yout = biasmostly0;
322         bi.yout = biasmostly1;
334         unsigned int hashed_idx = getIndex(tid, bi, spec, i);
339           threadData[tid]->sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
346         bi.yout += val;
361     bi.yout *= fudge;
403 MultiperspectivePerceptron::train(ThreadID tid, MPPBranchInfo &bi, bool taken)
410     bool correct = (bi.yout >= 1) == taken;
412     int abs_yout = abs(bi.yout);
421             unsigned int hashed_idx = getIndex(tid, bi, spec, i);
422             bool sign = sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
469         unsigned int hashed_idx = getIndex(tid, bi, spec, i);
472         bool sign = sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
477         sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits] = sign;
503                     unsigned int hashed_idx = getIndex(tid, bi, spec, i);
506                         sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
521                     unsigned int hashed_idx = getIndex(tid, bi, spec, i);
524                         sign_bits[i][hashed_idx][bi.getHPC() % n_sign_bits];
547     MPPBranchInfo *bi = new MPPBranchInfo(pc, pcshift, false);
550     bp_history = (void *)bi;
570     MPPBranchInfo *bi = new MPPBranchInfo(instPC, pcshift, true);
571     bp_history = (void *)bi;
577             bi->getHashFilter(threadData[tid]->last_ghist_bit) %
581             bi->filtered = true;
582             bi->prediction = false;
585             bi->filtered = true;
586             bi->prediction = true;
594     int bestval = computeOutput(tid, *bi);
596         bi->prediction = false;
598         if (abs(bi->yout) <= threshold) {
599             bi->prediction = (bestval >= 1);
601             bi->prediction = (bi->yout >= 1);
605     return bi->prediction;
615     MPPBranchInfo *bi = static_cast<MPPBranchInfo*>(bp_history);
618         //delete bi;
622     if (bi->isUnconditional()) {
623         delete bi;
630         int findex = bi->getHashFilter(threadData[tid]->last_ghist_bit) %
672         train(tid, *bi, taken);
686     if (!bi->filtered || (record_mask & RECORD_FILTERED_IMLI)) {
688         if (target < bi->getPC()) {
713     bool hashed_taken = hash_taken ? (taken ^ !!(bi->getPC() & (1<<pcbit)))
716     if (!bi->filtered || (record_mask & RECORD_FILTERED_GHIST)) {
731     if (!bi->filtered || (record_mask & RECORD_FILTERED_PATH)) {
736         threadData[tid]->path_history[0] = bi->getPC2();
740     if (!bi->filtered || (record_mask & RECORD_FILTERED_ACYCLIC)) {
741         threadData[tid]->updateAcyclic(hashed_taken, bi->getHPC());
745     if (!bi->filtered || (record_mask & RECORD_FILTERED_MOD)) {
748             if (bi->getHPC() % (i + 2) == 0) {
752                 threadData[tid]->modpath_histories[i][0] = bi->getPC2();
758     if (!bi->filtered || (record_mask & RECORD_FILTERED_BLURRY)) {
765                 unsigned int z = bi->getPC() >> i;
778     if (!bi->filtered || (record_mask & RECORD_FILTERED_MOD)) {
781             if (bi->getHPC() % (i + 2) == 0) {
793         if (!bi->filtered || (record_mask & RECORD_FILTERED_RECENCY)) {
794             threadData[tid]->insertRecency(bi->getPC2(), assoc);
799     if (!bi->filtered || (record_mask & RECORD_FILTERED_LOCAL)) {
800         threadData[tid]->localHistories.update(bi->getPC(), hashed_taken);
806     delete bi;
819     MPPBranchInfo *bi = static_cast<MPPBranchInfo*>(bp_history);
820     delete bi;