Abstract
We present an approach for formally verifying that a high-level microprocessor model behaves as defined by an instruction-set architecture. The technique is based on a specialization of self consistency called incremental flushing and reduces the need and effort required to create manually-generated implementation abstractions. Additionally, incremental flushing reduces the computational complexity of the proof obligations generated when reasoning about out-of-order execution. This is accomplished by comparing the functional behavior of the implementation abstraction over two sets of inputs: one that represents normal operation and one that is simpler, but functionally equivalent. The approach is illustrated on a simple out-of-order microprocessor core.
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