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Vl-distitem

Vl-distitem-fix

Fixing function for vl-distitem structures.

Signature
(vl-distitem-fix x) → new-x
Arguments: x — Guard (vl-distitem-p x).
Returns: new-x — Type (vl-distitem-p new-x).

Definitions and Theorems

Function: vl-distitem-fix$inline

(defun vl-distitem-fix$inline (x)
 (declare (xargs :guard (vl-distitem-p x)))
 (let ((__function__ 'vl-distitem-fix))
  (declare (ignorable __function__))
  (mbe
   :logic
   (b*
    ((left (vl-expr-fix (std::prod-car (std::prod-car (cdr x)))))
     (right
        (vl-maybe-expr-fix (std::prod-cdr (std::prod-car (cdr x)))))
     (type (vl-distweighttype-fix
                (std::prod-car (std::prod-cdr (cdr x)))))
     (weight (vl-expr-fix (std::prod-cdr (std::prod-cdr (cdr x))))))
    (cons
        :vl-distitem (std::prod-cons (std::prod-cons left right)
                                     (std::prod-cons type weight))))
   :exec x)))

Theorem: vl-distitem-p-of-vl-distitem-fix

(defthm vl-distitem-p-of-vl-distitem-fix
  (b* ((new-x (vl-distitem-fix$inline x)))
    (vl-distitem-p new-x))
  :rule-classes :rewrite)

Theorem: vl-distitem-fix-when-vl-distitem-p

(defthm vl-distitem-fix-when-vl-distitem-p
  (implies (vl-distitem-p x)
           (equal (vl-distitem-fix x) x)))

Function: vl-distitem-equiv$inline

(defun vl-distitem-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (vl-distitem-p acl2::x)
                              (vl-distitem-p acl2::y))))
  (equal (vl-distitem-fix acl2::x)
         (vl-distitem-fix acl2::y)))

Theorem: vl-distitem-equiv-is-an-equivalence

(defthm vl-distitem-equiv-is-an-equivalence
  (and (booleanp (vl-distitem-equiv x y))
       (vl-distitem-equiv x x)
       (implies (vl-distitem-equiv x y)
                (vl-distitem-equiv y x))
       (implies (and (vl-distitem-equiv x y)
                     (vl-distitem-equiv y z))
                (vl-distitem-equiv x z)))
  :rule-classes (:equivalence))

Theorem: vl-distitem-equiv-implies-equal-vl-distitem-fix-1

(defthm vl-distitem-equiv-implies-equal-vl-distitem-fix-1
  (implies (vl-distitem-equiv acl2::x x-equiv)
           (equal (vl-distitem-fix acl2::x)
                  (vl-distitem-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: vl-distitem-fix-under-vl-distitem-equiv

(defthm vl-distitem-fix-under-vl-distitem-equiv
  (vl-distitem-equiv (vl-distitem-fix acl2::x)
                     acl2::x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-vl-distitem-fix-1-forward-to-vl-distitem-equiv

(defthm equal-of-vl-distitem-fix-1-forward-to-vl-distitem-equiv
  (implies (equal (vl-distitem-fix acl2::x)
                  acl2::y)
           (vl-distitem-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: equal-of-vl-distitem-fix-2-forward-to-vl-distitem-equiv

(defthm equal-of-vl-distitem-fix-2-forward-to-vl-distitem-equiv
  (implies (equal acl2::x (vl-distitem-fix acl2::y))
           (vl-distitem-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: vl-distitem-equiv-of-vl-distitem-fix-1-forward

(defthm vl-distitem-equiv-of-vl-distitem-fix-1-forward
  (implies (vl-distitem-equiv (vl-distitem-fix acl2::x)
                              acl2::y)
           (vl-distitem-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: vl-distitem-equiv-of-vl-distitem-fix-2-forward

(defthm vl-distitem-equiv-of-vl-distitem-fix-2-forward
  (implies (vl-distitem-equiv acl2::x (vl-distitem-fix acl2::y))
           (vl-distitem-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)