cpu: Fix bi-mode branch predictor thresholds

[gem5.git] / src / cpu / pred / BranchPredictor.py

diff --git a/src/cpu/pred/BranchPredictor.py b/src/cpu/pred/BranchPredictor.py
index 5c52fb65e402090110db3f3362a0748ca206e746..1b400c2b769b64a95a512845ce1e66b64afa9d69 100644 (file)
--- a/src/cpu/pred/BranchPredictor.py
+++ b/src/cpu/pred/BranchPredictor.py
@@ -42,6 +42,16 @@ class BranchPredictor(SimObject):
     RASSize = Param.Unsigned(16, "RAS size")
     instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by")
 
+    useIndirect = Param.Bool(True, "Use indirect branch predictor")
+    indirectHashGHR = Param.Bool(True, "Hash branch predictor GHR")
+    indirectHashTargets = Param.Bool(True, "Hash path history targets")
+    indirectSets = Param.Unsigned(256, "Cache sets for indirect predictor")
+    indirectWays = Param.Unsigned(2, "Ways for indirect predictor")
+    indirectTagSize = Param.Unsigned(16, "Indirect target cache tag bits")
+    indirectPathLength = Param.Unsigned(3,
+        "Previous indirect targets to use for path history")
+
+
 
 class LocalBP(BranchPredictor):
     type = 'LocalBP'
@@ -76,3 +86,19 @@ class BiModeBP(BranchPredictor):
     choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor")
     choiceCtrBits = Param.Unsigned(2, "Bits of choice counters")
 
+class LTAGE(BranchPredictor):
+    type = 'LTAGE'
+    cxx_class = 'LTAGE'
+    cxx_header = "cpu/pred/ltage.hh"
+
+    logSizeBiMP = Param.Unsigned(14, "Log size of Bimodal predictor in bits")
+    logSizeTagTables = Param.Unsigned(11, "Log size of tag table in LTAGE")
+    logSizeLoopPred = Param.Unsigned(8, "Log size of the loop predictor")
+    nHistoryTables = Param.Unsigned(12, "Number of history tables")
+    tagTableCounterBits = Param.Unsigned(3, "Number of tag table counter bits")
+    histBufferSize = Param.Unsigned(2097152,
+            "A large number to track all branch histories(2MEntries default)")
+    minHist = Param.Unsigned(4, "Minimum history size of LTAGE")
+    maxHist = Param.Unsigned(640, "Maximum history size of LTAGE")
+    minTagWidth = Param.Unsigned(7, "Minimum tag size in tag tables")
+