bpred_unit.hh (10273:6e6557085eb7) bpred_unit.hh (10330:f54586c894e3)
1/*
2 * Copyright (c) 2011-2012, 2014 ARM Limited
3 * Copyright (c) 2010 The University of Edinburgh
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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173 * @param bp_history Pointer to the branch predictor state that is
174 * associated with the branch lookup that is being updated.
175 * @param squashed Set to true when this function is called during a
176 * squash operation.
177 * @todo Make this update flexible enough to handle a global predictor.
178 */
179 virtual void update(Addr instPC, bool taken, void *bp_history,
180 bool squashed) = 0;
1/*
2 * Copyright (c) 2011-2012, 2014 ARM Limited
3 * Copyright (c) 2010 The University of Edinburgh
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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173 * @param bp_history Pointer to the branch predictor state that is
174 * associated with the branch lookup that is being updated.
175 * @param squashed Set to true when this function is called during a
176 * squash operation.
177 * @todo Make this update flexible enough to handle a global predictor.
178 */
179 virtual void update(Addr instPC, bool taken, void *bp_history,
180 bool squashed) = 0;
181 /**
182 * Deletes the associated history with a branch, performs no predictor
183 * updates. Used for branches that mispredict and update tables but
184 * are still speculative and later retire.
185 * @param bp_history History to delete associated with this predictor
186 */
187 virtual void retireSquashed(void *bp_history) = 0;
181
182 /**
183 * Updates the BTB with the target of a branch.
184 * @param inst_PC The branch's PC that will be updated.
185 * @param target_PC The branch's target that will be added to the BTB.
186 */
187 void BTBUpdate(Addr instPC, const TheISA::PCState &target)
188 { BTB.update(instPC, target, 0); }

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195 * Makes a predictor history struct that contains any
196 * information needed to update the predictor, BTB, and RAS.
197 */
198 PredictorHistory(const InstSeqNum &seq_num, Addr instPC,
199 bool pred_taken, void *bp_history,
200 ThreadID _tid)
201 : seqNum(seq_num), pc(instPC), bpHistory(bp_history), RASTarget(0),
202 RASIndex(0), tid(_tid), predTaken(pred_taken), usedRAS(0), pushedRAS(0),
188
189 /**
190 * Updates the BTB with the target of a branch.
191 * @param inst_PC The branch's PC that will be updated.
192 * @param target_PC The branch's target that will be added to the BTB.
193 */
194 void BTBUpdate(Addr instPC, const TheISA::PCState &target)
195 { BTB.update(instPC, target, 0); }

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202 * Makes a predictor history struct that contains any
203 * information needed to update the predictor, BTB, and RAS.
204 */
205 PredictorHistory(const InstSeqNum &seq_num, Addr instPC,
206 bool pred_taken, void *bp_history,
207 ThreadID _tid)
208 : seqNum(seq_num), pc(instPC), bpHistory(bp_history), RASTarget(0),
209 RASIndex(0), tid(_tid), predTaken(pred_taken), usedRAS(0), pushedRAS(0),
203 wasCall(0), wasReturn(0)
210 wasCall(0), wasReturn(0), wasSquashed(0)
204 {}
205
206 bool operator==(const PredictorHistory &entry) const {
207 return this->seqNum == entry.seqNum;
208 }
209
210 /** The sequence number for the predictor history entry. */
211 InstSeqNum seqNum;

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229 ThreadID tid;
230
231 /** Whether or not it was predicted taken. */
232 bool predTaken;
233
234 /** Whether or not the RAS was used. */
235 bool usedRAS;
236
211 {}
212
213 bool operator==(const PredictorHistory &entry) const {
214 return this->seqNum == entry.seqNum;
215 }
216
217 /** The sequence number for the predictor history entry. */
218 InstSeqNum seqNum;

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236 ThreadID tid;
237
238 /** Whether or not it was predicted taken. */
239 bool predTaken;
240
241 /** Whether or not the RAS was used. */
242 bool usedRAS;
243
237 /* Wether or not the RAS was pushed */
244 /* Whether or not the RAS was pushed */
238 bool pushedRAS;
239
240 /** Whether or not the instruction was a call. */
241 bool wasCall;
242
243 /** Whether or not the instruction was a return. */
244 bool wasReturn;
245 bool pushedRAS;
246
247 /** Whether or not the instruction was a call. */
248 bool wasCall;
249
250 /** Whether or not the instruction was a return. */
251 bool wasReturn;
252
253 /** Whether this instruction has already mispredicted/updated bp */
254 bool wasSquashed;
245 };
246
247 typedef std::deque<PredictorHistory> History;
248
249 /** Number of the threads for which the branch history is maintained. */
250 uint32_t numThreads;
251
252 /**

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256
257 typedef std::deque<PredictorHistory> History;
258
259 /** Number of the threads for which the branch history is maintained. */
260 uint32_t numThreads;
261
262 /**

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