bp: add BHT with private history #2793
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| @@ -62,6 +62,8 @@ package cva6_config_pkg; | |||
| localparam CVA6ConfigRASDepth = 2; | |||
| localparam CVA6ConfigBTBEntries = 0; | |||
| localparam CVA6ConfigBHTEntries = 32; | |||
| localparam CVA6ConfigBHTHist = 3; | |||
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Better to not use localparam, this can generate bugs because localparam is static and parameter is dynamic (can be configured from outside).
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Are you referring only to the CVA6ConfigBHTHist parameter? What would be the recommended solution?
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The solution is to proceed as in cv32a60x configuration: remove localparam declaration and set it as seen below:
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However, BHTHist should be a tuneable parameter like the remaining ones. My understanding is that cv32a60x and cv32a65x are hardcoded, while remaining config packages have the localparam pattern to tune them. Do you think BHTHist only should be hardcoded?
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Co-authored-by: Riccardo Tedeschi <[email protected]>
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This PR adds a new two-level BHT predictor with private history, as depicted below. The new
BPTypeparameters allow choosing between the original BHT and the new one.