Skip to content

Tage way tuning align #803

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
CJ362ff wants to merge 11 commits into
base: xs-dev
Choose a base branch
from
Open

Tage way tuning align #803

Changes from all commits
Commits
Show all changes
11 commits
Select commit Hold shift + click to select a range
70d0ca3
cpu-o3: change tage T2 way to 4
Mar 19, 2026
f9e128f
cpu-o3: tage T3 table change to 4
Mar 19, 2026
8bdbac9
cpu-o3: tage T1 table 4way
Mar 20, 2026
c113f1c
cpu-o3: tage 8way 8k
Mar 20, 2026
ac20e3f
cpu-o3: update TAGE table sizes and number of ways for BTBTAGE
Mar 23, 2026
0c52707
cpu-o3: update numWays configuration for BTBTAGE predictor
Mar 23, 2026
3058ef0
cpu: Tune BTBTAGE default tables and ways
Mar 24, 2026
2d970fc
cpu: Set BTBTAGE defaults to round21 config
Mar 24, 2026
fe5af39
cpu-o3: tage 512 1 0.7
Mar 30, 2026
f2266fe
cpu-o3: update BTBTAGE table sizes and number of ways
Apr 2, 2026
0f712f2
cpu-o3: update BTBTAGE table sizes for improved performance
Apr 2, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 2 additions & 2 deletions src/cpu/pred/BranchPredictor.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1044,15 +1044,15 @@ class BTBTAGE(TimedBaseBTBPredictor):
enableSC = Param.Bool(False, "Enable SC or not") # TODO: BTBTAGE doesn't support SC
updateOnRead = Param.Bool(True, "Enable update on read, no need to save tage meta in FTQ")
numPredictors = Param.Unsigned(8, "Number of TAGE predictors")
tableSizes = VectorParam.Unsigned([2048, 2048, 2048, 2048, 2048, 2048, 2048,2048],"the TAGE T0~Tn length")
tableSizes = VectorParam.Unsigned([2048, 2048, 4096, 4096, 4096, 4096, 2048, 2048], "the TAGE T0~Tn length")
TTagBitSizes = VectorParam.Unsigned([13] * 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 = 32 # tage index function uses 32B aligned block address

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 = VectorParam.Unsigned([2] * 8,"the T0~Tn number of ways per set")
numWays = VectorParam.Unsigned([2,2,2,2,2,2,2,2], "the T0~Tn 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")
Expand Down
Loading