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Fconst

Fconstp

Recognizer for fconst structures.

Signature
(fconstp x) → *

Definitions and Theorems

Function: fconstp

(defun fconstp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'fconstp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :dec))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 2)
                     (b* ((core (std::da-nth 0 (cdr x)))
                          (suffix? (std::da-nth 1 (cdr x))))
                       (and (dec-core-fconstp core)
                            (fsuffix-optionp suffix?)))))
               (t (and (eq (car x) :hex)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 3))
                       (b* ((prefix (std::da-nth 0 (cdr x)))
                            (core (std::da-nth 1 (cdr x)))
                            (suffix? (std::da-nth 2 (cdr x))))
                         (and (hprefixp prefix)
                              (hex-core-fconstp core)
                              (fsuffix-optionp suffix?)))))))))

Theorem: consp-when-fconstp

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