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Representation-of-integer-conversions

Uchar-from-schar

Convert from type signed char to type unsigned char.

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

Definitions and Theorems

Function: uchar-from-schar

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

Theorem: ucharp-of-uchar-from-schar

(defthm ucharp-of-uchar-from-schar
  (b* ((result (uchar-from-schar x)))
    (ucharp result))
  :rule-classes :rewrite)

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

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

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

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