Correctness of the circuit.
The equivalence between predicate and specification is proved automatically via the prime fields library rules.
The extension to the circuit is boilerplate.
Theorem:
(defthm field-neg-pred-to-spec (implies (and (primep prime) (pfield::fep x prime) (pfield::fep y prime)) (equal (field-neg-pred x y prime) (field-neg-spec x y prime))))
Theorem:
(defthm field-neg-circuit-to-spec (implies (and (equal (pfcs::lookup-definition (pfname "field_neg") defs) (field-neg-circuit)) (primep prime) (pfield::fep x prime) (pfield::fep y prime)) (equal (pfcs::definition-satp (pfname "field_neg") defs (list x y) prime) (field-neg-spec x y prime))))