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Representation-of-integer-operations

Ne-uint-uint

Non-equality of a value of type unsigned int and a value of type unsigned int [C:6.5.9].

Definitions and Theorems

Function: ne-uint-uint

(defun ne-uint-uint (x y)
  (declare (xargs :guard (and (uintp x) (uintp y))))
  (if (/= (integer-from-uint x)
          (integer-from-uint y))
      (sint-from-integer 1)
    (sint-from-integer 0)))

Theorem: sintp-of-ne-uint-uint

(defthm sintp-of-ne-uint-uint
  (sintp (ne-uint-uint x y)))

Theorem: ne-uint-uint-of-uint-fix-x

(defthm ne-uint-uint-of-uint-fix-x
  (equal (ne-uint-uint (uint-fix x) y)
         (ne-uint-uint x y)))

Theorem: ne-uint-uint-uint-equiv-congruence-on-x

(defthm ne-uint-uint-uint-equiv-congruence-on-x
  (implies (uint-equiv x x-equiv)
           (equal (ne-uint-uint x y)
                  (ne-uint-uint x-equiv y)))
  :rule-classes :congruence)

Theorem: ne-uint-uint-of-uint-fix-y

(defthm ne-uint-uint-of-uint-fix-y
  (equal (ne-uint-uint x (uint-fix y))
         (ne-uint-uint x y)))

Theorem: ne-uint-uint-uint-equiv-congruence-on-y

(defthm ne-uint-uint-uint-equiv-congruence-on-y
  (implies (uint-equiv y y-equiv)
           (equal (ne-uint-uint x y)
                  (ne-uint-uint x y-equiv)))
  :rule-classes :congruence)