Formal Verification of Superscalar Microprocessors with Multicycle Functional Units

We extend the Burch and Dill flushing technique [6] for formal verification of microprocessors to be applicable to designs where the functional units and memories have multicycle and possibly arbitrary latency. We also show ways to incorporate exceptions and branch prediction by exploiting the properties of the logic of Positive Equality with Uninterpreted Functions [4][5]. We study the modeling of the above features in different versions of dualissue superscalar processors.