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Representation-of-integer-conversions

Ushort-from-slong

Convert from type signed long to type unsigned short.

Signature
(ushort-from-slong x) → result
Arguments: x — Guard (slongp x).
Returns: result — Type (ushortp result).

Definitions and Theorems

Function: ushort-from-slong

(defun ushort-from-slong (x)
  (declare (xargs :guard (slongp x)))
  (let ((__function__ 'ushort-from-slong))
    (declare (ignorable __function__))
    (ushort-from-integer-mod (integer-from-slong x))))

Theorem: ushortp-of-ushort-from-slong

(defthm ushortp-of-ushort-from-slong
  (b* ((result (ushort-from-slong x)))
    (ushortp result))
  :rule-classes :rewrite)

Theorem: ushort-from-slong-of-slong-fix-x

(defthm ushort-from-slong-of-slong-fix-x
  (equal (ushort-from-slong (slong-fix x))
         (ushort-from-slong x)))

Theorem: ushort-from-slong-slong-equiv-congruence-on-x

(defthm ushort-from-slong-slong-equiv-congruence-on-x
  (implies (slong-equiv x x-equiv)
           (equal (ushort-from-slong x)
                  (ushort-from-slong x-equiv)))
  :rule-classes :congruence)