Add preliminary support for merging difftrace #180
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This commit adds preliminary support for merging difftest bundles across various cycles to reduce the memory traffic. Some cases do not support merging yet and should be identified in the bundle definitions via `supportsMerge` and `supportsBase`. Examples include skipped instructions and store events (to maintain the golden memory). Currently XiangShan requires ~20K merged difftrace during 100K cycles of simulation with the microbench workload (~100K instructions). NutShell requires ~612 merged difftrace during the 100K cycles of simulation with the microbench workload (~50K instructions). XiangShan requires more merged difftrace because of the existence of StoreEvent to maintain the global golden memory.
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This commit adds preliminary support for merging difftest bundles across various cycles to reduce the memory traffic.
Some cases do not support merging yet and should be identified in the bundle definitions via
supportsMergeandsupportsBase. Examples include skipped instructions and store events (to maintain the golden memory).Currently XiangShan requires ~20K merged difftrace during 100K cycles of simulation with the microbench workload (~100K instructions). NutShell requires ~612 merged difftrace during the 100K cycles of simulation with the microbench workload (~50K instructions). XiangShan requires more merged difftrace because of the existence of StoreEvent to maintain the global golden memory.