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Representation-of-integer-conversions

Sshort-from-schar

Convert from type signed char to type signed short.

Signature
(sshort-from-schar x) → result
Arguments: x — Guard (scharp x).
Returns: result — Type (sshortp result).

Definitions and Theorems

Function: sshort-from-schar

(defun sshort-from-schar (x)
  (declare (xargs :guard (scharp x)))
  (let ((__function__ 'sshort-from-schar))
    (declare (ignorable __function__))
    (sshort-from-integer (integer-from-schar x))))

Theorem: sshortp-of-sshort-from-schar

(defthm sshortp-of-sshort-from-schar
  (b* ((result (sshort-from-schar x)))
    (sshortp result))
  :rule-classes :rewrite)

Theorem: sshort-from-schar-of-schar-fix-x

(defthm sshort-from-schar-of-schar-fix-x
  (equal (sshort-from-schar (schar-fix x))
         (sshort-from-schar x)))

Theorem: sshort-from-schar-schar-equiv-congruence-on-x

(defthm sshort-from-schar-schar-equiv-congruence-on-x
  (implies (schar-equiv x x-equiv)
           (equal (sshort-from-schar x)
                  (sshort-from-schar x-equiv)))
  :rule-classes :congruence)