cpu/pred/tage_sc_l_8KB.cc

68         BranchInfo* bi, int hitBank, int altBank) const
70     return (bi->predBeforeSC + (((hitBank+1)/4)<<4) + (bi->highConf<<1) +
71             (bi->lowConf <<2) +((altBank!=0)<<3)) & ((1<<logBias) -1);
76     ThreadID tid, Addr branch_pc, BranchInfo* bi, int & lsum, int64_t phist)
125         BranchInfo* bi, int64_t phist)
128     gUpdate(pc, taken, sh->globalHist, gm, ggehl, gnb, logGnb, wg, bi);
129     gUpdate(pc, taken, sh->bwHist, bwm, bwgehl, bwnb, logBwnb, wbw, bi);
131             bi);
132     gUpdate(pc, taken, sh->imliCount, im, igehl, inb, logInb, wi, bi);
190     bool alloc, bool taken, TAGEBase::BranchInfo* bi, int nrand)
201     for (int I = calcDep(bi); I < nHistoryTables; I += 2) {
209                 if (gtable[i][bi->tableIndices[i]].u == 0) {
210                     gtable[i][bi->tableIndices[i]].u =
213                     gtable[i][bi->tableIndices[i]].tag = bi->tableTags[i];
214                     gtable[i][bi->tableIndices[i]].ctr = taken ? 0 : -1;
223                     int8_t ctr = gtable[i][bi->tableIndices[i]].ctr;
224                     if ((gtable[i][bi->tableIndices[i]].u == 1) &
227                             gtable[i][bi->tableIndices[i]].u = 0;
259                                      TAGEBase::BranchInfo* bi)
261     if (bi->hitBank > 0) {
262         if (abs (2 * gtable[bi->hitBank][bi->hitBankIndex].ctr + 1) == 1) {
263             if (bi->longestMatchPred != taken) { // acts as a protection
264                 if (bi->altBank > 0) {
265                     int8_t ctr = gtable[bi->altBank][bi->altBankIndex].ctr;
267                         gtable[bi->altBank][bi->altBankIndex].u = 0;
271                     ctrUpdate(gtable[bi->altBank][bi->altBankIndex].ctr, taken,
273                     ctr = gtable[bi->altBank][bi->altBankIndex].ctr;
275                         gtable[bi->altBank][bi->altBankIndex].u = 0;
278                 if (bi->altBank == 0) {
279                     baseUpdate(branch_pc, taken, bi);
285         if (abs (2 * gtable[bi->hitBank][bi->hitBankIndex].ctr + 1) == 1) {
286             gtable[bi->hitBank][bi->hitBankIndex].u = 0;
289         ctrUpdate(gtable[bi->hitBank][bi->hitBankIndex].ctr, taken,
293         if (abs (2 * gtable[bi->hitBank][bi->hitBankIndex].ctr + 1) == 1) {
294             gtable[bi->hitBank][bi->hitBankIndex].u = 0;
297         if (bi->altTaken == taken) {
298             if (bi->altBank > 0) {
299                 int8_t ctr = gtable[bi->altBank][bi->altBankIndex].ctr;
301                     if (gtable[bi->hitBank][bi->hitBankIndex].u == 1) {
302                         if (bi->longestMatchPred == taken) {
303                             gtable[bi->hitBank][bi->hitBankIndex].u = 0;
310         baseUpdate(branch_pc, taken, bi);
313     if ((bi->longestMatchPred != bi->altTaken) &&
314         (bi->longestMatchPred == taken) &&
315         (gtable[bi->hitBank][bi->hitBankIndex].u < (1 << tagTableUBits) -1)) {
316             gtable[bi->hitBank][bi->hitBankIndex].u++;