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| author | Mitch Hayenga <mitch.hayenga@arm.com> | 2016-04-05 11:48:37 -0500 |
|---|---|---|
| committer | Mitch Hayenga <mitch.hayenga@arm.com> | 2016-04-05 11:48:37 -0500 |
| commit | 1578d2d0b66d995684cee77b3fe527ed0493d41c (patch) | |
| tree | 120b81ec01c889a41c26ddbc6e26cb0434db764b /src/cpu/pred/BranchPredictor.py | |
| parent | 7bc52af7716168baa5deb28bb88475ddbba5d62a (diff) | |
| download | gem5-1578d2d0b66d995684cee77b3fe527ed0493d41c.tar.xz | |
cpu: Add an indirect branch target predictor
This patch adds a configurable indirect branch predictor that can be indexed
by a combination of GHR and path history hashes. Implements the functionality
described in:
"Target prediction for indirect jumps" by Chang, Hao, and Patt
http://dl.acm.org/citation.cfm?id=264209
Diffstat (limited to 'src/cpu/pred/BranchPredictor.py')
| -rw-r--r-- | src/cpu/pred/BranchPredictor.py | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/cpu/pred/BranchPredictor.py b/src/cpu/pred/BranchPredictor.py index 5c52fb65e..2d7d0d0e2 100644 --- 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' |