diff options
Diffstat (limited to 'src/cpu/pred/bpred_unit.hh')
| -rw-r--r-- | src/cpu/pred/bpred_unit.hh | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/cpu/pred/bpred_unit.hh b/src/cpu/pred/bpred_unit.hh index 61b375f9b..f75ab79d5 100644 --- a/src/cpu/pred/bpred_unit.hh +++ b/src/cpu/pred/bpred_unit.hh @@ -178,6 +178,13 @@ class BPredUnit : public SimObject */ virtual void update(Addr instPC, bool taken, void *bp_history, bool squashed) = 0; + /** + * Deletes the associated history with a branch, performs no predictor + * updates. Used for branches that mispredict and update tables but + * are still speculative and later retire. + * @param bp_history History to delete associated with this predictor + */ + virtual void retireSquashed(void *bp_history) = 0; /** * Updates the BTB with the target of a branch. @@ -200,7 +207,7 @@ class BPredUnit : public SimObject ThreadID _tid) : seqNum(seq_num), pc(instPC), bpHistory(bp_history), RASTarget(0), RASIndex(0), tid(_tid), predTaken(pred_taken), usedRAS(0), pushedRAS(0), - wasCall(0), wasReturn(0) + wasCall(0), wasReturn(0), wasSquashed(0) {} bool operator==(const PredictorHistory &entry) const { @@ -234,7 +241,7 @@ class BPredUnit : public SimObject /** Whether or not the RAS was used. */ bool usedRAS; - /* Wether or not the RAS was pushed */ + /* Whether or not the RAS was pushed */ bool pushedRAS; /** Whether or not the instruction was a call. */ @@ -242,6 +249,9 @@ class BPredUnit : public SimObject /** Whether or not the instruction was a return. */ bool wasReturn; + + /** Whether this instruction has already mispredicted/updated bp */ + bool wasSquashed; }; typedef std::deque<PredictorHistory> History; |