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Utage improve align #782

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f876900
cpu-o3: Enhance MicroTAGE predictor parameters for improved
Mar 10, 2026
84ec451
cpu-o3: MicroTAGE predictor parameters for enhanced performance
Mar 11, 2026
9f1f22a
cpu-o3: Update MicroTAGE parameters for improved performance
Mar 11, 2026
40d1549
cpu-o3: Update MicroTAGE history lengths for improved prediction accu…
Mar 11, 2026
b7c5c0c
cpu-o3: Update MicroTAGE tag bit sizes for improved prediction
Mar 11, 2026
1198737
cpu-o3: Update MicroTAGE tag bit sizes and history lengths
Mar 11, 2026
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11 changes: 5 additions & 6 deletions src/cpu/pred/BranchPredictor.py
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Expand Up @@ -1071,16 +1071,15 @@ class MicroTAGE(TimedBaseBTBPredictor):
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")
tableSizes = VectorParam.Unsigned([512]*4 ,"the TAGE T0~Tn length")
TTagBitSizes = VectorParam.Unsigned([13]*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")
blockSize = Param.Unsigned(32,"tage index function uses 32B aligned block address")

histLengths = VectorParam.Unsigned([5,9,17,27] ,"the BTB TAGE T0~Tn history length")
histLengths = VectorParam.Unsigned([5,17,56,109] ,"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")
baseTableSize = Param.Unsigned(256,"Base table size")
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")
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