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Sib-p

Recognizer for sib bit structures.

Function: sib-p$inline

(defun sib-p$inline (x)
  (declare (xargs :guard t))
  (mbe :logic (unsigned-byte-p 8 x)
       :exec (and (natp x) (< x 256))))

Theorem: sib-p-when-unsigned-byte-p

(defthm sib-p-when-unsigned-byte-p
  (implies (unsigned-byte-p 8 x)
           (sib-p x)))

Theorem: unsigned-byte-p-when-sib-p

(defthm unsigned-byte-p-when-sib-p
  (implies (sib-p x)
           (unsigned-byte-p 8 x)))

Theorem: sib-p-compound-recognizer

(defthm sib-p-compound-recognizer
  (implies (sib-p x) (natp x))
  :rule-classes :compound-recognizer)