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Defbyte-standard-instances

Ubyte20

Fixtype of unsigned bytes of size 20.

Definitions and Theorems

Function: ubyte20-equiv$inline

(defun ubyte20-equiv$inline (x y)
  (declare (xargs :guard (and (ubyte20p x) (ubyte20p y))))
  (equal (ubyte20-fix x) (ubyte20-fix y)))

Theorem: ubyte20-equiv-is-an-equivalence

(defthm ubyte20-equiv-is-an-equivalence
  (and (booleanp (ubyte20-equiv x y))
       (ubyte20-equiv x x)
       (implies (ubyte20-equiv x y)
                (ubyte20-equiv y x))
       (implies (and (ubyte20-equiv x y)
                     (ubyte20-equiv y z))
                (ubyte20-equiv x z)))
  :rule-classes (:equivalence))

Theorem: ubyte20-equiv-implies-equal-ubyte20-fix-1

(defthm ubyte20-equiv-implies-equal-ubyte20-fix-1
  (implies (ubyte20-equiv x x-equiv)
           (equal (ubyte20-fix x)
                  (ubyte20-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: ubyte20-fix-under-ubyte20-equiv

(defthm ubyte20-fix-under-ubyte20-equiv
  (ubyte20-equiv (ubyte20-fix x) x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-ubyte20-fix-1-forward-to-ubyte20-equiv

(defthm equal-of-ubyte20-fix-1-forward-to-ubyte20-equiv
  (implies (equal (ubyte20-fix x) y)
           (ubyte20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-ubyte20-fix-2-forward-to-ubyte20-equiv

(defthm equal-of-ubyte20-fix-2-forward-to-ubyte20-equiv
  (implies (equal x (ubyte20-fix y))
           (ubyte20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: ubyte20-equiv-of-ubyte20-fix-1-forward

(defthm ubyte20-equiv-of-ubyte20-fix-1-forward
  (implies (ubyte20-equiv (ubyte20-fix x) y)
           (ubyte20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: ubyte20-equiv-of-ubyte20-fix-2-forward

(defthm ubyte20-equiv-of-ubyte20-fix-2-forward
  (implies (ubyte20-equiv x (ubyte20-fix y))
           (ubyte20-equiv x y))
  :rule-classes :forward-chaining)

Subtopics

Ubyte20p: Recognizer for ubyte20.
Ubyte20-fix: Fixer for ubyte20.