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Ubyte256-fix

Fixer for ubyte256.

Function: ubyte256-fix

(defun ubyte256-fix (x)
  (declare (xargs :guard (ubyte256p x)))
  (mbe :logic (if (ubyte256p x) x 0)
       :exec x))

Theorem: ubyte256p-of-ubyte256-fix

(defthm ubyte256p-of-ubyte256-fix
  (b* ((fixed-x (ubyte256-fix x)))
    (ubyte256p fixed-x))
  :rule-classes :rewrite)

Theorem: ubyte256-fix-when-ubyte256p

(defthm ubyte256-fix-when-ubyte256p
  (implies (ubyte256p x)
           (equal (ubyte256-fix x) x)))