microarchitectural state
ConceptMicroarchitectural state is the implementation-level processor state, such as predictor, cache, TLB, FIFO/backpressure, and other internal structures, that can influence execution timing and internal paths while being distinct from architectural program state. In the supplied evidence, it is important mainly for simulation-based processor verification: Logic Fuzzer deliberately perturbs such state or related control signals to reach atypical states and expose bugs that ordinary tests may miss.
WIKI
Overview
Microarchitectural state is the processor-internal state associated with implementation structures and control behavior, as distinct from the architectural state visible to the ISA-level model. The evidence contrasts Dromajo checkpoints, which are snapshots of a processor's architectural state, with caches, TLBs, and other memory elements whose reset contents can lose microarchitectural states from which bugs might manifest. [C1]
In the Logic Fuzzer work, microarchitectural state matters because a processor bug may require a difficult-to-reach internal condition before it produces an architecturally visible mismatch against a golden model. The paper describes the key simulation-verification challenge as developing a code sequence that brings the processor into a buggy microarchitectural state that results in an inconsistent architectural state. [C2]
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