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Formal verification of microprocessor components has been pursued in Intel processor development projects in various forms for over a decade. Usually formal verification has been used to supplement more traditional coverage oriented testing activities. For the Intel$^{\mbox{\tiny\circledR}}$ Core$^{\mbox{\tiny TM}}$ i7 design we took a step further and used formal verification as the primary validation vehicle for the core execution cluster, the component responsible for the functional behaviour of all microinstructions. We applied symbolic simulation based formal verification techniques for full datapath, control and state validation for the cluster, and dropped coverage driven testing entirely [2]. The project, involving some twenty person years of verification work, is one of the most ambitious formal verification efforts in the hardware industry to date, and shows that under the right circumstances, full formal verification of a major design component is a feasible, industrially viable and competitive validation approach.

lecture notes in computer science

Intel $^{\mbox{\scriptsize\circledR}}$ Core $^{\mbox{\scriptsize TM}}$ i7 Processor Execution Engine Validation in a Functional Language Based Formal Framework