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Byte-list

Byte-list-fix

(byte-list-fix x) is a usual ACL2::fty list fixing function.

Signature
(byte-list-fix x) → fty::newx
Arguments: x — Guard (my-byte-listp x).
Returns: fty::newx — Type (my-byte-listp fty::newx).

In the logic, we apply n08-fix to each member of the x. In the execution, none of that is actually necessary and this is just an inlined identity function.

Definitions and Theorems

Function: byte-list-fix$inline

(defun byte-list-fix$inline (x)
  (declare (xargs :guard (my-byte-listp x)))
  (let ((__function__ 'byte-list-fix))
    (declare (ignorable __function__))
    (mbe :logic
         (if (atom x)
             nil
           (cons (n08-fix (car x))
                 (byte-list-fix (cdr x))))
         :exec x)))

Theorem: my-byte-listp-of-byte-list-fix

(defthm my-byte-listp-of-byte-list-fix
  (b* ((fty::newx (byte-list-fix$inline x)))
    (my-byte-listp fty::newx))
  :rule-classes :rewrite)

Theorem: byte-list-fix-when-my-byte-listp

(defthm byte-list-fix-when-my-byte-listp
  (implies (my-byte-listp x)
           (equal (byte-list-fix x) x)))

Function: byte-list-equiv$inline

(defun byte-list-equiv$inline (x y)
  (declare (xargs :guard (and (my-byte-listp x)
                              (my-byte-listp y))))
  (equal (byte-list-fix x)
         (byte-list-fix y)))

Theorem: byte-list-equiv-is-an-equivalence

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

Theorem: byte-list-equiv-implies-equal-byte-list-fix-1

(defthm byte-list-equiv-implies-equal-byte-list-fix-1
  (implies (byte-list-equiv x x-equiv)
           (equal (byte-list-fix x)
                  (byte-list-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: byte-list-fix-under-byte-list-equiv

(defthm byte-list-fix-under-byte-list-equiv
  (byte-list-equiv (byte-list-fix x) x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-byte-list-fix-1-forward-to-byte-list-equiv

(defthm equal-of-byte-list-fix-1-forward-to-byte-list-equiv
  (implies (equal (byte-list-fix x) y)
           (byte-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-byte-list-fix-2-forward-to-byte-list-equiv

(defthm equal-of-byte-list-fix-2-forward-to-byte-list-equiv
  (implies (equal x (byte-list-fix y))
           (byte-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: byte-list-equiv-of-byte-list-fix-1-forward

(defthm byte-list-equiv-of-byte-list-fix-1-forward
  (implies (byte-list-equiv (byte-list-fix x) y)
           (byte-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: byte-list-equiv-of-byte-list-fix-2-forward

(defthm byte-list-equiv-of-byte-list-fix-2-forward
  (implies (byte-list-equiv x (byte-list-fix y))
           (byte-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: car-of-byte-list-fix-x-under-n08-equiv

(defthm car-of-byte-list-fix-x-under-n08-equiv
  (n08-equiv (car (byte-list-fix x))
             (car x)))

Theorem: car-byte-list-equiv-congruence-on-x-under-n08-equiv

(defthm car-byte-list-equiv-congruence-on-x-under-n08-equiv
  (implies (byte-list-equiv x x-equiv)
           (n08-equiv (car x) (car x-equiv)))
  :rule-classes :congruence)

Theorem: cdr-of-byte-list-fix-x-under-byte-list-equiv

(defthm cdr-of-byte-list-fix-x-under-byte-list-equiv
  (byte-list-equiv (cdr (byte-list-fix x))
                   (cdr x)))

Theorem: cdr-byte-list-equiv-congruence-on-x-under-byte-list-equiv

(defthm cdr-byte-list-equiv-congruence-on-x-under-byte-list-equiv
  (implies (byte-list-equiv x x-equiv)
           (byte-list-equiv (cdr x) (cdr x-equiv)))
  :rule-classes :congruence)

Theorem: cons-of-n08-fix-x-under-byte-list-equiv

(defthm cons-of-n08-fix-x-under-byte-list-equiv
  (byte-list-equiv (cons (n08-fix x) y)
                   (cons x y)))

Theorem: cons-n08-equiv-congruence-on-x-under-byte-list-equiv

(defthm cons-n08-equiv-congruence-on-x-under-byte-list-equiv
  (implies (n08-equiv x x-equiv)
           (byte-list-equiv (cons x y)
                            (cons x-equiv y)))
  :rule-classes :congruence)

Theorem: cons-of-byte-list-fix-y-under-byte-list-equiv

(defthm cons-of-byte-list-fix-y-under-byte-list-equiv
  (byte-list-equiv (cons x (byte-list-fix y))
                   (cons x y)))

Theorem: cons-byte-list-equiv-congruence-on-y-under-byte-list-equiv

(defthm cons-byte-list-equiv-congruence-on-y-under-byte-list-equiv
  (implies (byte-list-equiv y y-equiv)
           (byte-list-equiv (cons x y)
                            (cons x y-equiv)))
  :rule-classes :congruence)

Theorem: consp-of-byte-list-fix

(defthm consp-of-byte-list-fix
  (equal (consp (byte-list-fix x))
         (consp x)))

Theorem: byte-list-fix-under-iff

(defthm byte-list-fix-under-iff
  (iff (byte-list-fix x) (consp x)))

Theorem: byte-list-fix-of-cons

(defthm byte-list-fix-of-cons
  (equal (byte-list-fix (cons a x))
         (cons (n08-fix a) (byte-list-fix x))))

Theorem: len-of-byte-list-fix

(defthm len-of-byte-list-fix
  (equal (len (byte-list-fix x)) (len x)))

Theorem: byte-list-fix-of-append

(defthm byte-list-fix-of-append
  (equal (byte-list-fix (append std::a std::b))
         (append (byte-list-fix std::a)
                 (byte-list-fix std::b))))

Theorem: byte-list-fix-of-repeat

(defthm byte-list-fix-of-repeat
  (equal (byte-list-fix (acl2::repeat n x))
         (acl2::repeat n (n08-fix x))))

Theorem: list-equiv-refines-byte-list-equiv

(defthm list-equiv-refines-byte-list-equiv
  (implies (acl2::list-equiv x y)
           (byte-list-equiv x y))
  :rule-classes :refinement)

Theorem: nth-of-byte-list-fix

(defthm nth-of-byte-list-fix
  (equal (nth n (byte-list-fix x))
         (if (< (nfix n) (len x))
             (n08-fix (nth n x))
           nil)))

Theorem: byte-list-equiv-implies-byte-list-equiv-append-1

(defthm byte-list-equiv-implies-byte-list-equiv-append-1
  (implies (byte-list-equiv x fty::x-equiv)
           (byte-list-equiv (append x y)
                            (append fty::x-equiv y)))
  :rule-classes (:congruence))

Theorem: byte-list-equiv-implies-byte-list-equiv-append-2

(defthm byte-list-equiv-implies-byte-list-equiv-append-2
  (implies (byte-list-equiv y fty::y-equiv)
           (byte-list-equiv (append x y)
                            (append x fty::y-equiv)))
  :rule-classes (:congruence))

Theorem: byte-list-equiv-implies-byte-list-equiv-nthcdr-2

(defthm byte-list-equiv-implies-byte-list-equiv-nthcdr-2
  (implies (byte-list-equiv l l-equiv)
           (byte-list-equiv (nthcdr n l)
                            (nthcdr n l-equiv)))
  :rule-classes (:congruence))

Theorem: byte-list-equiv-implies-byte-list-equiv-take-2

(defthm byte-list-equiv-implies-byte-list-equiv-take-2
  (implies (byte-list-equiv l l-equiv)
           (byte-list-equiv (take n l)
                            (take n l-equiv)))
  :rule-classes (:congruence))