		Search-engine friendly clone of the ACL2 documentation.

Feat-base

Feat-basep

Recognizer for feat-base structures.

Signature
(feat-basep x) → *

Definitions and Theorems

Function: feat-basep

(defun feat-basep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'feat-basep))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :rv32i))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               ((eq (car x) :rv64i)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               ((eq (car x) :rv32e)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               (t (and (eq (car x) :rv64e)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-feat-basep

(defthm consp-when-feat-basep
  (implies (feat-basep x) (consp x))
  :rule-classes :compound-recognizer)