cpu/pred/loop_predictor.cc

132         int idx = finallindex(bi->loopIndex, bi->loopIndexB, i);
133         if (ltable[idx].tag == bi->loopTag) {
135             bi->loopPredValid = calcConf(idx);
137             uint16_t iter = speculative ? ltable[idx].currentIterSpec
138                                         : ltable[idx].currentIter;
140             if ((iter + 1) == ltable[idx].numIter) {
141                 return useDirectionBit ? !(ltable[idx].dir) : false;
143                 return useDirectionBit ? (ltable[idx].dir) : true;
179     int idx = finallindex(bi->loopIndex, bi->loopIndexB, bi->loopHit);
185                 ltable[idx].numIter = 0;
186                 ltable[idx].age = 0;
187                 ltable[idx].confidence = 0;
188                 ltable[idx].currentIter = 0;
192                 unsignedCtrUpdate(ltable[idx].age, true, loopTableAgeBits);
196         ltable[idx].currentIter =
197             (ltable[idx].currentIter + 1) & loopNumIterMask;
198         if (ltable[idx].currentIter > ltable[idx].numIter) {
199             ltable[idx].confidence = 0;
200             if (ltable[idx].numIter != 0) {
202                 ltable[idx].numIter = 0;
204                     ltable[idx].age = 0;
209         if (taken != (useDirectionBit ? ltable[idx].dir : true)) {
210             if (ltable[idx].currentIter == ltable[idx].numIter) {
212                 unsignedCtrUpdate(ltable[idx].confidence, true,
215                 if (ltable[idx].numIter < 3) {
217                     ltable[idx].dir = taken; // ignored if no useDirectionBit
218                     ltable[idx].numIter = 0;
219                     ltable[idx].age = 0;
220                     ltable[idx].confidence = 0;
224                 if (ltable[idx].numIter == 0) {
226                     ltable[idx].confidence = 0;
227                     ltable[idx].numIter = ltable[idx].currentIter;
231                     ltable[idx].numIter = 0;
233                         ltable[idx].age = 0;
235                     ltable[idx].confidence = 0;
238             ltable[idx].currentIter = 0;
247                 idx = finallindex(bi->loopIndex, bi->loopIndexB, loop_hit);
248                 if (ltable[idx].age == 0) {
252                     ltable[idx].dir = !taken; // ignored if no useDirectionBit
253                     ltable[idx].tag = bi->loopTag;
254                     ltable[idx].numIter = 0;
255                     ltable[idx].age = initialLoopAge;
256                     ltable[idx].confidence = 0;
257                     ltable[idx].currentIter = initialLoopIter;
261                     ltable[idx].age--;
297         int idx = finallindex(bi->loopIndex,
300         ltable[idx].currentIterSpec = bi->currentIter;
308         int idx = finallindex(bi->loopIndex,
311         ltable[idx].currentIterSpec = bi->currentIter;