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• Vl-consteval

Vl-consteval-wideunary

Signature

(vl-consteval-wideunary op aval) → ans

Arguments

op — Guard (member op '(:vl-unary-plus :vl-unary-minus :vl-unary-bitnot)).

aval — Guard (natp aval).

Returns

ans — Type (integerp ans).

Definitions and Theorems

Function: vl-consteval-wideunary

(defun vl-consteval-wideunary (op aval)
 (declare
  (xargs
    :guard
    (and (member op
                 '(:vl-unary-plus :vl-unary-minus :vl-unary-bitnot))
         (natp aval))))
 (let ((__function__ 'vl-consteval-wideunary))
   (declare (ignorable __function__))
   (b* ((aval (lnfix aval)))
     (case op (:vl-unary-plus aval)
           (:vl-unary-minus (- aval))
           (:vl-unary-bitnot (lognot aval))
           (otherwise (progn$ (impossible) 0))))))

Theorem: integerp-of-vl-consteval-wideunary

(defthm integerp-of-vl-consteval-wideunary
  (b* ((ans (vl-consteval-wideunary op aval)))
    (integerp ans))
  :rule-classes :type-prescription)

Theorem: vl-consteval-wideunary-of-nfix-aval

(defthm vl-consteval-wideunary-of-nfix-aval
  (equal (vl-consteval-wideunary op (nfix aval))
         (vl-consteval-wideunary op aval)))

Theorem: vl-consteval-wideunary-nat-equiv-congruence-on-aval

(defthm vl-consteval-wideunary-nat-equiv-congruence-on-aval
  (implies (acl2::nat-equiv aval aval-equiv)
           (equal (vl-consteval-wideunary op aval)
                  (vl-consteval-wideunary op aval-equiv)))
  :rule-classes :congruence)