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| author | Anthony Gutierrez <atgutier@umich.edu> | 2014-06-30 13:50:01 -0400 |
|---|---|---|
| committer | Anthony Gutierrez <atgutier@umich.edu> | 2014-06-30 13:50:01 -0400 |
| commit | db267da8221ce4905e08e84967096d7a9fa23ca6 (patch) | |
| tree | 2271f5354bee6d7b82bbe9e6f8dc852fd2ae5cd0 /configs/common | |
| parent | 5b08e211ab35fd6d936dafda45014c78b5e68300 (diff) | |
| download | gem5-db267da8221ce4905e08e84967096d7a9fa23ca6.tar.xz | |
arm: make the bi-mode predictor the default for O3_ARM_v7a_BP
the branch predictor used in the Cortex-A15 is a bi-mode style predictor,
see:
http://arm.com/files/pdf/at-exploring_the_design_of_the_cortex-a15.pdf
and
http://nvidia.com/docs/IO/116757/NVIDIA_Quad_a15_whitepaper_FINALv2.pdf
this patch makes the bi-mode predictor the default for the ARM O3 CPU.
Diffstat (limited to 'configs/common')
| -rw-r--r-- | configs/common/O3_ARM_v7a.py | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/configs/common/O3_ARM_v7a.py b/configs/common/O3_ARM_v7a.py index 3b7df9988..0202d19e4 100644 --- a/configs/common/O3_ARM_v7a.py +++ b/configs/common/O3_ARM_v7a.py @@ -42,7 +42,7 @@ class O3_ARM_v7a_Complex_Int(FUDesc): count = 1 -# Floating point and SIMD instructions +# Floating point and SIMD instructions class O3_ARM_v7a_FP(FUDesc): opList = [ OpDesc(opClass='SimdAdd', opLat=4), OpDesc(opClass='SimdAddAcc', opLat=4), @@ -87,12 +87,9 @@ class O3_ARM_v7a_FUP(FUPool): FUList = [O3_ARM_v7a_Simple_Int(), O3_ARM_v7a_Complex_Int(), O3_ARM_v7a_Load(), O3_ARM_v7a_Store(), O3_ARM_v7a_FP()] -# Tournament Branch Predictor +# Bi-Mode Branch Predictor class O3_ARM_v7a_BP(BranchPredictor): - predType = "tournament" - localPredictorSize = 2048 - localCtrBits = 2 - localHistoryTableSize = 1024 + predType = "bi-mode" globalPredictorSize = 8192 globalCtrBits = 2 choicePredictorSize = 8192 @@ -167,7 +164,7 @@ class O3_ARM_v7a_DCache(BaseCache): write_buffers = 16 is_top_level = 'true' -# TLB Cache +# TLB Cache # Use a cache as a L2 TLB class O3_ARM_v7aWalkCache(BaseCache): hit_latency = 4 |