Each parameter is prefixed with BranchPrediction.BranchPrediction, for example:
BranchPrediction.BranchPrediction.bpstat-branchcount
Table
5-2 BranchPrediction parameters
| Name |
Type |
Default value |
Allowed values |
Runtime |
Description |
bpstat-branchcount |
int |
-0x1 |
0x0 - 0x7fffffffffffffff |
false |
The number of branch data to display. Set to -1 to display all branch instructions. |
bpstat-pathfilename |
string |
- |
- |
false |
The path and filename of the branch statistics log, relative to the current directory. If you omit it, no log file is generated. |
mispredict-latency |
int |
0x8 |
0x0 - 0x7fffffffffffffff |
false |
The number of instructions that are flushed for every misprediction.
It is equal to the pipeline length of the processor. For example, in a processor where the prefetch unit has three stages and the execution units have five stages, the pipeline length is eight. Therefore the mispredict-latency is eight clock cycles.
|
predictor-type |
string |
"CortexA53Predictor" |
See the note following the table. |
false |
The type of branch predictor to use. |
Note:
predictor-type can be one of the following example branch predictors that Arm provides, or a user-defined one:
FixedDirectionPredictor- An example predictor that always takes a preset fixed direction.
BiModalPredictor- An example of a standard 2-bit strength predictor.
GSharePredictor- An example of a standard global history sharing predictor.
HybridPredictor- An example predictor that selects the majority result from the bimodal predictor, fixed-direction predictor, and a random predictor.
CortexA53Predictor- Cortex®‑A53 branch predictor. This is the default.
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