cpu-o3: Update MicroTAGE parameters for improved performance

Change-Id: Ib50725992e93e3e72aae63f44ddd817371837e38

Author: Cao Jiaming

src/cpu/pred/BranchPredictor.py

@@ -1070,16 +1070,16 @@ class MicroTAGE(TimedBaseBTBPredictor):
     enableSC = Param.Bool(False, "Enable SC or not")
     updateOnRead = Param.Bool(True,"Enable update on read, no need to save tage meta in FTQ")
     # Keep vector parameters consistent with numPredictors to avoid constructor asserts.
-    numPredictors = Param.Unsigned(4, "Number of TAGE predictors")
-    tableSizes = VectorParam.Unsigned([512]*4 ,"the TAGE T0~Tn length")
-    TTagBitSizes = VectorParam.Unsigned([16]*4  ,"the T0~Tn entry's tag bit size")
-    TTagPcShifts = VectorParam.Unsigned([1]*4  ,"when the T0~Tn entry's tag generating, PC right shift")
+    numPredictors = Param.Unsigned(8, "Number of TAGE predictors")
+    tableSizes = VectorParam.Unsigned([2048]*8 ,"the TAGE T0~Tn length")
+    TTagBitSizes = VectorParam.Unsigned([16]*8  ,"the T0~Tn entry's tag bit size")
+    TTagPcShifts = VectorParam.Unsigned([1]*8  ,"when the T0~Tn entry's tag generating, PC right shift")
     blockSize = Param.Unsigned(32,"tage index function uses 32B aligned block address")
 
-    histLengths = VectorParam.Unsigned([5, 29, 57, 107] ,"the BTB TAGE T0~Tn history length")
+    histLengths = VectorParam.Unsigned([4, 9, 17, 29, 56, 109, 211, 397] ,"the BTB TAGE T0~Tn history length")
     maxHistLen = Param.Unsigned(970,"The length of history passed from DBP")
     numTablesToAlloc = Param.Unsigned(1,"The number of table to allocated each time")
-    numWays = Param.Unsigned(1, "Number of ways per set")
+    numWays = Param.Unsigned(2, "Number of ways per set")
     maxBranchPositions = Param.Unsigned(32,"Maximum branch positions per 64-byte block")
     useAltOnNaSize = Param.Unsigned(128,"Size of the useAltOnNa table")
     useAltOnNaWidth = Param.Unsigned(7,"Width of the useAltOnNa table")