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Sbyte128-fix

Fixer for sbyte128.

Function: sbyte128-fix

(defun sbyte128-fix (x)
  (declare (xargs :guard (sbyte128p x)))
  (mbe :logic (if (sbyte128p x) x 0)
       :exec x))

Theorem: sbyte128p-of-sbyte128-fix

(defthm sbyte128p-of-sbyte128-fix
  (b* ((fixed-x (sbyte128-fix x)))
    (sbyte128p fixed-x))
  :rule-classes :rewrite)

Theorem: sbyte128-fix-when-sbyte128p

(defthm sbyte128-fix-when-sbyte128p
  (implies (sbyte128p x)
           (equal (sbyte128-fix x) x)))