bpred_unit.hh (11433:72b075cdc336) bpred_unit.hh (11434:b5aed9d2d54e)
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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93 */
94 bool predict(const StaticInstPtr &inst, const InstSeqNum &seqNum,
95 TheISA::PCState &pc, ThreadID tid);
96 bool predictInOrder(const StaticInstPtr &inst, const InstSeqNum &seqNum,
97 int asid, TheISA::PCState &instPC,
98 TheISA::PCState &predPC, ThreadID tid);
99
100 // @todo: Rename this function.
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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93 */
94 bool predict(const StaticInstPtr &inst, const InstSeqNum &seqNum,
95 TheISA::PCState &pc, ThreadID tid);
96 bool predictInOrder(const StaticInstPtr &inst, const InstSeqNum &seqNum,
97 int asid, TheISA::PCState &instPC,
98 TheISA::PCState &predPC, ThreadID tid);
99
100 // @todo: Rename this function.
101 virtual void uncondBranch(Addr pc, void * &bp_history) = 0;
101 virtual void uncondBranch(ThreadID tid, Addr pc, void * &bp_history) = 0;
102
103 /**
104 * Tells the branch predictor to commit any updates until the given
105 * sequence number.
106 * @param done_sn The sequence number to commit any older updates up until.
107 * @param tid The thread id.
108 */
109 void update(const InstSeqNum &done_sn, ThreadID tid);

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128 void squash(const InstSeqNum &squashed_sn,
129 const TheISA::PCState &corr_target,
130 bool actually_taken, ThreadID tid);
131
132 /**
133 * @param bp_history Pointer to the history object. The predictor
134 * will need to update any state and delete the object.
135 */
102
103 /**
104 * Tells the branch predictor to commit any updates until the given
105 * sequence number.
106 * @param done_sn The sequence number to commit any older updates up until.
107 * @param tid The thread id.
108 */
109 void update(const InstSeqNum &done_sn, ThreadID tid);

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128 void squash(const InstSeqNum &squashed_sn,
129 const TheISA::PCState &corr_target,
130 bool actually_taken, ThreadID tid);
131
132 /**
133 * @param bp_history Pointer to the history object. The predictor
134 * will need to update any state and delete the object.
135 */
136 virtual void squash(void *bp_history) = 0;
136 virtual void squash(ThreadID tid, void *bp_history) = 0;
137
138 /**
139 * Looks up a given PC in the BP to see if it is taken or not taken.
140 * @param inst_PC The PC to look up.
141 * @param bp_history Pointer that will be set to an object that
142 * has the branch predictor state associated with the lookup.
143 * @return Whether the branch is taken or not taken.
144 */
137
138 /**
139 * Looks up a given PC in the BP to see if it is taken or not taken.
140 * @param inst_PC The PC to look up.
141 * @param bp_history Pointer that will be set to an object that
142 * has the branch predictor state associated with the lookup.
143 * @return Whether the branch is taken or not taken.
144 */
145 virtual bool lookup(Addr instPC, void * &bp_history) = 0;
145 virtual bool lookup(ThreadID tid, Addr instPC, void * &bp_history) = 0;
146
147 /**
148 * If a branch is not taken, because the BTB address is invalid or missing,
149 * this function sets the appropriate counter in the global and local
150 * predictors to not taken.
151 * @param inst_PC The PC to look up the local predictor.
152 * @param bp_history Pointer that will be set to an object that
153 * has the branch predictor state associated with the lookup.
154 */
146
147 /**
148 * If a branch is not taken, because the BTB address is invalid or missing,
149 * this function sets the appropriate counter in the global and local
150 * predictors to not taken.
151 * @param inst_PC The PC to look up the local predictor.
152 * @param bp_history Pointer that will be set to an object that
153 * has the branch predictor state associated with the lookup.
154 */
155 virtual void btbUpdate(Addr instPC, void * &bp_history) = 0;
155 virtual void btbUpdate(ThreadID tid, Addr instPC, void * &bp_history) = 0;
156
157 /**
158 * Looks up a given PC in the BTB to see if a matching entry exists.
159 * @param inst_PC The PC to look up.
160 * @return Whether the BTB contains the given PC.
161 */
162 bool BTBValid(Addr instPC)
163 { return BTB.valid(instPC, 0); }

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175 * @param inst_PC The branch's PC that will be updated.
176 * @param taken Whether the branch was taken or not taken.
177 * @param bp_history Pointer to the branch predictor state that is
178 * associated with the branch lookup that is being updated.
179 * @param squashed Set to true when this function is called during a
180 * squash operation.
181 * @todo Make this update flexible enough to handle a global predictor.
182 */
156
157 /**
158 * Looks up a given PC in the BTB to see if a matching entry exists.
159 * @param inst_PC The PC to look up.
160 * @return Whether the BTB contains the given PC.
161 */
162 bool BTBValid(Addr instPC)
163 { return BTB.valid(instPC, 0); }

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175 * @param inst_PC The branch's PC that will be updated.
176 * @param taken Whether the branch was taken or not taken.
177 * @param bp_history Pointer to the branch predictor state that is
178 * associated with the branch lookup that is being updated.
179 * @param squashed Set to true when this function is called during a
180 * squash operation.
181 * @todo Make this update flexible enough to handle a global predictor.
182 */
183 virtual void update(Addr instPC, bool taken, void *bp_history,
184 bool squashed) = 0;
183 virtual void update(ThreadID tid, Addr instPC, bool taken,
184 void *bp_history, bool squashed) = 0;
185 /**
186 * Deletes the associated history with a branch, performs no predictor
187 * updates. Used for branches that mispredict and update tables but
188 * are still speculative and later retire.
189 * @param bp_history History to delete associated with this predictor
190 */
185 /**
186 * Deletes the associated history with a branch, performs no predictor
187 * updates. Used for branches that mispredict and update tables but
188 * are still speculative and later retire.
189 * @param bp_history History to delete associated with this predictor
190 */
191 virtual void retireSquashed(void *bp_history) = 0;
191 virtual void retireSquashed(ThreadID tid, void *bp_history) = 0;
192
193 /**
194 * Updates the BTB with the target of a branch.
195 * @param inst_PC The branch's PC that will be updated.
196 * @param target_PC The branch's target that will be added to the BTB.
197 */
198 void BTBUpdate(Addr instPC, const TheISA::PCState &target)
199 { BTB.update(instPC, target, 0); }
200
201
192
193 /**
194 * Updates the BTB with the target of a branch.
195 * @param inst_PC The branch's PC that will be updated.
196 * @param target_PC The branch's target that will be added to the BTB.
197 */
198 void BTBUpdate(Addr instPC, const TheISA::PCState &target)
199 { BTB.update(instPC, target, 0); }
200
201
202 virtual unsigned getGHR(void* bp_history) const { return 0; }
202 virtual unsigned getGHR(ThreadID tid, void* bp_history) const { return 0; }
203
204 void dump();
205
206 private:
207 struct PredictorHistory {
208 /**
209 * Makes a predictor history struct that contains any
210 * information needed to update the predictor, BTB, and RAS.

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204 void dump();
205
206 private:
207 struct PredictorHistory {
208 /**
209 * Makes a predictor history struct that contains any
210 * information needed to update the predictor, BTB, and RAS.

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