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• Uchar-format

Uchar-format-fix

Fixing function for uchar-format structures.

Signature

(uchar-format-fix x) → new-x

Arguments

x — Guard (uchar-formatp x).

Returns

new-x — Type (uchar-formatp new-x).

Definitions and Theorems

Function: uchar-format-fix$inline

(defun uchar-format-fix$inline (x)
  (declare (xargs :guard (uchar-formatp x)))
  (let ((__function__ 'uchar-format-fix))
    (declare (ignorable __function__))
    (mbe :logic
         (b* ((bits (nfix (cdr (std::da-nth 0 x)))))
           (let ((bits (if (>= bits 8) bits 8)))
             (list (cons 'bits bits))))
         :exec x)))

Theorem: uchar-formatp-of-uchar-format-fix

(defthm uchar-formatp-of-uchar-format-fix
  (b* ((new-x (uchar-format-fix$inline x)))
    (uchar-formatp new-x))
  :rule-classes :rewrite)

Theorem: uchar-format-fix-when-uchar-formatp

(defthm uchar-format-fix-when-uchar-formatp
  (implies (uchar-formatp x)
           (equal (uchar-format-fix x) x)))

Function: uchar-format-equiv$inline

(defun uchar-format-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (uchar-formatp acl2::x)
                              (uchar-formatp acl2::y))))
  (equal (uchar-format-fix acl2::x)
         (uchar-format-fix acl2::y)))

Theorem: uchar-format-equiv-is-an-equivalence

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

Theorem: uchar-format-equiv-implies-equal-uchar-format-fix-1

(defthm uchar-format-equiv-implies-equal-uchar-format-fix-1
  (implies (uchar-format-equiv acl2::x x-equiv)
           (equal (uchar-format-fix acl2::x)
                  (uchar-format-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: uchar-format-fix-under-uchar-format-equiv

(defthm uchar-format-fix-under-uchar-format-equiv
  (uchar-format-equiv (uchar-format-fix acl2::x)
                      acl2::x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-uchar-format-fix-1-forward-to-uchar-format-equiv

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

Theorem: equal-of-uchar-format-fix-2-forward-to-uchar-format-equiv

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

Theorem: uchar-format-equiv-of-uchar-format-fix-1-forward

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

Theorem: uchar-format-equiv-of-uchar-format-fix-2-forward

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