		Search-engine friendly clone of the ACL2 documentation.

Representation

Stypep

Sequential type of a logical AIG node.

Recall that AIG nodes are represented as lists like (:pi), (:gate fanin0 fanin1), etc.

The sequential type of such a type is just its leading keyword. The valid sequential types are:

:const for the special constant node
:and for an AND gate node
:xor for an XOR gate node
:pi or :po for primary input/output nodes
:reg for register nodes (register outputs)
:nxst for next state nodes (register inputs)

See also combinational-type for a combinational (instead of sequential) view of AIG node types.

This is an ordinary defenum.

Function: stypep

(defun stypep (x)
  (declare (xargs :guard t))
  (or (eq x ':pi)
      (eq x ':reg)
      (eq x ':po)
      (eq x ':nxst)
      (eq x ':and)
      (eq x ':xor)
      (eq x ':const)))

Theorem: type-when-stypep

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

Subtopics

Sequential-type: See stypep.