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Ienv

Ienv-fix

Fixing function for ienv structures.

Signature
(ienv-fix x) → new-x
Arguments: x — Guard (ienvp x).
Returns: new-x — Type (ienvp new-x).

Definitions and Theorems

Function: ienv-fix$inline

(defun ienv-fix$inline (x)
  (declare (xargs :guard (ienvp x)))
  (mbe :logic
       (b* ((version (c::version-fix (cdr (std::da-nth 0 x))))
            (short-bytes (pos-fix (cdr (std::da-nth 1 x))))
            (int-bytes (pos-fix (cdr (std::da-nth 2 x))))
            (long-bytes (pos-fix (cdr (std::da-nth 3 x))))
            (llong-bytes (pos-fix (cdr (std::da-nth 4 x))))
            (plain-char-signedp (bool-fix (cdr (std::da-nth 5 x)))))
         (let ((short-bytes (if (and (<= short-bytes int-bytes)
                                     (<= int-bytes long-bytes)
                                     (<= long-bytes llong-bytes)
                                     (<= 2 short-bytes)
                                     (<= 2 int-bytes)
                                     (<= 4 long-bytes)
                                     (<= 8 llong-bytes))
                                short-bytes
                              2))
               (int-bytes (if (and (<= short-bytes int-bytes)
                                   (<= int-bytes long-bytes)
                                   (<= long-bytes llong-bytes)
                                   (<= 2 short-bytes)
                                   (<= 2 int-bytes)
                                   (<= 4 long-bytes)
                                   (<= 8 llong-bytes))
                              int-bytes
                            2))
               (long-bytes (if (and (<= short-bytes int-bytes)
                                    (<= int-bytes long-bytes)
                                    (<= long-bytes llong-bytes)
                                    (<= 2 short-bytes)
                                    (<= 2 int-bytes)
                                    (<= 4 long-bytes)
                                    (<= 8 llong-bytes))
                               long-bytes
                             4))
               (llong-bytes (if (and (<= short-bytes int-bytes)
                                     (<= int-bytes long-bytes)
                                     (<= long-bytes llong-bytes)
                                     (<= 2 short-bytes)
                                     (<= 2 int-bytes)
                                     (<= 4 long-bytes)
                                     (<= 8 llong-bytes))
                                llong-bytes
                              8)))
           (list (cons 'version version)
                 (cons 'short-bytes short-bytes)
                 (cons 'int-bytes int-bytes)
                 (cons 'long-bytes long-bytes)
                 (cons 'llong-bytes llong-bytes)
                 (cons 'plain-char-signedp
                       plain-char-signedp))))
       :exec x))

Theorem: ienvp-of-ienv-fix

(defthm ienvp-of-ienv-fix
  (b* ((new-x (ienv-fix$inline x)))
    (ienvp new-x))
  :rule-classes :rewrite)

Theorem: ienv-fix-when-ienvp

(defthm ienv-fix-when-ienvp
  (implies (ienvp x)
           (equal (ienv-fix x) x)))

Function: ienv-equiv$inline

(defun ienv-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (ienvp acl2::x) (ienvp acl2::y))))
  (equal (ienv-fix acl2::x)
         (ienv-fix acl2::y)))

Theorem: ienv-equiv-is-an-equivalence

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

Theorem: ienv-equiv-implies-equal-ienv-fix-1

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

Theorem: ienv-fix-under-ienv-equiv

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

Theorem: equal-of-ienv-fix-1-forward-to-ienv-equiv

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

Theorem: equal-of-ienv-fix-2-forward-to-ienv-equiv

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

Theorem: ienv-equiv-of-ienv-fix-1-forward

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

Theorem: ienv-equiv-of-ienv-fix-2-forward

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

Theorem: ienv-fix$inline-of-ienv-fix-x

(defthm ienv-fix$inline-of-ienv-fix-x
  (equal (ienv-fix$inline (ienv-fix x))
         (ienv-fix$inline x)))

Theorem: ienv-fix$inline-ienv-equiv-congruence-on-x

(defthm ienv-fix$inline-ienv-equiv-congruence-on-x
  (implies (ienv-equiv x x-equiv)
           (equal (ienv-fix$inline x)
                  (ienv-fix$inline x-equiv)))
  :rule-classes :congruence)