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Opcode-maps

Operand-type-code-p

Codes for Operand Type; See Intel Vol. 2, Appendix A.2.2

This is an ordinary defenum.

Function: operand-type-code-p

(defun operand-type-code-p (x)
  (declare (xargs :guard t))
  (or (eq x 'a)
      (eq x 'b)
      (eq x 'c)
      (eq x 'd)
      (eq x 'dq)
      (eq x 'p)
      (eq x 'pd)
      (eq x 'pi)
      (eq x 'ps)
      (eq x 'q)
      (eq x 'qq)
      (eq x 's)
      (eq x 'sd)
      (eq x 'ss)
      (eq x 'si)
      (eq x 'v)
      (eq x 'w)
      (eq x 'x)
      (eq x 'y)
      (eq x 'z)))

Theorem: type-when-operand-type-code-p

(defthm type-when-operand-type-code-p
  (implies (operand-type-code-p x)
           (if (symbolp x)
               (if (not (equal x 't))
                   (not (equal x 'nil))
                 'nil)
             'nil))
  :rule-classes :compound-recognizer)