cpu: Made LTAGE parameters configurable

This includes TAGE tag sizes, TAGE table sizes, U counters reset period,
loop predictor associativity, path history size, the USE_ALT_ON_NA size
and the WITHLOOP size

Change-Id: I935823f0a5794f5d55b744263798897a813dc1bd
Signed-off-by: Pau Cabre <pau.cabre@metempsy.com>
Reviewed-on: https://gem5-review.googlesource.com/c/14417
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/src/cpu/pred/ltage.hh b/src/cpu/pred/ltage.hh
index 68aef1cc9..8b417d44d 100644
--- a/src/cpu/pred/ltage.hh
+++ b/src/cpu/pred/ltage.hh
@@ -354,9 +354,7 @@ class LTAGE: public BPredUnit
      */
     void specLoopUpdate(Addr pc, bool taken, BranchInfo* bi);
 
-    const unsigned logSizeBiMP;
     const unsigned logRatioBiModalHystEntries;
-    const unsigned logSizeTagTables;
     const unsigned logSizeLoopPred;
     const unsigned nHistoryTables;
     const unsigned tagTableCounterBits;
@@ -364,16 +362,19 @@ class LTAGE: public BPredUnit
     const unsigned histBufferSize;
     const unsigned minHist;
     const unsigned maxHist;
-    const unsigned minTagWidth;
+    const unsigned pathHistBits;
     const unsigned loopTableAgeBits;
     const unsigned loopTableConfidenceBits;
     const unsigned loopTableTagBits;
     const unsigned loopTableIterBits;
-
+    const unsigned logLoopTableAssoc;
     const uint8_t confidenceThreshold;
     const uint16_t loopTagMask;
     const uint16_t loopNumIterMask;
 
+    const std::vector<unsigned> tagTableTagWidths;
+    const std::vector<int> logTagTableSizes;
+
     std::vector<bool> btablePrediction;
     std::vector<bool> btableHysteresis;
     TageEntry **gtable;
@@ -404,16 +405,16 @@ class LTAGE: public BPredUnit
 
     std::vector<ThreadHistory> threadHistory;
 
-    int tagWidths[15];
-    int tagTableSizes[15];
     int *histLengths;
     int *tableIndices;
     int *tableTags;
 
     int8_t loopUseCounter;
     int8_t useAltPredForNewlyAllocated;
-    int tCounter;
-    int logTick;
+    uint64_t tCounter;
+    uint64_t logUResetPeriod;
+    unsigned useAltOnNaBits;
+    unsigned withLoopBits;
 };
 
 #endif // __CPU_PRED_LTAGE