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Ubyte128-fix

Fixer for ubyte128.

Function: ubyte128-fix

(defun ubyte128-fix (x)
  (declare (xargs :guard (ubyte128p x)))
  (mbe :logic (if (ubyte128p x) x 0)
       :exec x))

Theorem: ubyte128p-of-ubyte128-fix

(defthm ubyte128p-of-ubyte128-fix
  (b* ((fixed-x (ubyte128-fix x)))
    (ubyte128p fixed-x))
  :rule-classes :rewrite)

Theorem: ubyte128-fix-when-ubyte128p

(defthm ubyte128-fix-when-ubyte128p
  (implies (ubyte128p x)
           (equal (ubyte128-fix x) x)))