diff options
Diffstat (limited to 'src/cpu/pred/tage.hh')
| -rw-r--r-- | src/cpu/pred/tage.hh | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/src/cpu/pred/tage.hh b/src/cpu/pred/tage.hh index 9ba02414c..c66c28cb1 100644 --- a/src/cpu/pred/tage.hh +++ b/src/cpu/pred/tage.hh @@ -71,6 +71,8 @@ class TAGE: public BPredUnit virtual void squash(ThreadID tid, void *bp_history) override; unsigned getGHR(ThreadID tid, void *bp_history) const override; + virtual void regStats() override; + protected: // Prediction Structures @@ -110,6 +112,15 @@ class TAGE: public BPredUnit } }; + // provider type + enum { + BIMODAL_ONLY = 0, + TAGE_LONGEST_MATCH, + BIMODAL_ALT_MATCH, + TAGE_ALT_MATCH, + LAST_TAGE_PROVIDER_TYPE = TAGE_ALT_MATCH + }; + // Primary branch history entry struct TageBranchInfo { @@ -141,6 +152,9 @@ class TAGE: public BPredUnit int *ct0; int *ct1; + // for stats purposes + unsigned provider; + TageBranchInfo(int sz) : pathHist(0), ptGhist(0), hitBank(0), hitBankIndex(0), @@ -148,7 +162,8 @@ class TAGE: public BPredUnit bimodalIndex(0), tagePred(false), altTaken(false), condBranch(false), longestMatchPred(false), - pseudoNewAlloc(false), branchPC(0) + pseudoNewAlloc(false), branchPC(0), + provider(-1) { storage = new int [sz * 5]; tableIndices = storage; @@ -320,6 +335,14 @@ class TAGE: public BPredUnit bool tagePredict( ThreadID tid, Addr branch_pc, bool cond_branch, TageBranchInfo* bi); + /** + * Update the stats + * @param taken Actual branch outcome + * @param bi Pointer to information on the prediction + * recorded at prediction time. + */ + virtual void updateStats(bool taken, TageBranchInfo* bi); + const unsigned logRatioBiModalHystEntries; const unsigned nHistoryTables; const unsigned tagTableCounterBits; @@ -369,6 +392,21 @@ class TAGE: public BPredUnit uint64_t tCounter; uint64_t logUResetPeriod; unsigned useAltOnNaBits; + + // stats + Stats::Scalar tageLongestMatchProviderCorrect; + Stats::Scalar tageAltMatchProviderCorrect; + Stats::Scalar bimodalAltMatchProviderCorrect; + Stats::Scalar tageBimodalProviderCorrect; + Stats::Scalar tageLongestMatchProviderWrong; + Stats::Scalar tageAltMatchProviderWrong; + Stats::Scalar bimodalAltMatchProviderWrong; + Stats::Scalar tageBimodalProviderWrong; + Stats::Scalar tageAltMatchProviderWouldHaveHit; + Stats::Scalar tageLongestMatchProviderWouldHaveHit; + + Stats::Vector tageLongestMatchProvider; + Stats::Vector tageAltMatchProvider; }; #endif // __CPU_PRED_TAGE |