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Uinteger-bit-role

Uinteger-bit-rolep

Recognizer for uinteger-bit-role structures.

Signature
(uinteger-bit-rolep x) → *

Definitions and Theorems

Function: uinteger-bit-rolep

(defun uinteger-bit-rolep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'uinteger-bit-rolep))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :value))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((exp (std::da-nth 0 (cdr x))))
                       (natp exp))))
               (t (and (eq (car x) :padding)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-uinteger-bit-rolep

(defthm consp-when-uinteger-bit-rolep
  (implies (uinteger-bit-rolep x)
           (consp x))
  :rule-classes :compound-recognizer)