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Uchar-format

Uchar-formatp

Recognizer for uchar-format structures.

Signature
(uchar-formatp x) → *

Definitions and Theorems

Function: uchar-formatp

(defun uchar-formatp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'uchar-formatp))
    (declare (ignorable __function__))
    (and (mbe :logic (and (alistp x)
                          (equal (strip-cars x) '(bits)))
              :exec (fty::alist-with-carsp x '(bits)))
         (b* ((bits (cdr (std::da-nth 0 x))))
           (and (natp bits) (>= bits 8))))))

Theorem: consp-when-uchar-formatp

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