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Stripping-functions

Vl-distitem-strip

Signature
(vl-distitem-strip x) → new-x
Arguments: x — Guard (vl-distitem-p x).
Returns: new-x — Type (vl-distitem-p new-x).

Definitions and Theorems

Function: vl-distitem-strip

(defun vl-distitem-strip (x)
  (declare (xargs :guard (vl-distitem-p x)))
  (let ((__function__ 'vl-distitem-strip))
    (declare (ignorable __function__))
    (b* (((vl-distitem x) (vl-distitem-fix x)))
      (b* ((left (vl-expr-strip x.left))
           (right (vl-maybe-expr-strip x.right))
           (weight (vl-expr-strip x.weight)))
        (change-vl-distitem x
                            :left left
                            :right right
                            :weight weight)))))

Theorem: vl-distitem-p-of-vl-distitem-strip

(defthm vl-distitem-p-of-vl-distitem-strip
  (b* ((new-x (vl-distitem-strip x)))
    (vl-distitem-p new-x))
  :rule-classes :rewrite)

Theorem: vl-distitem-strip-of-vl-distitem-fix-x

(defthm vl-distitem-strip-of-vl-distitem-fix-x
  (equal (vl-distitem-strip (vl-distitem-fix x))
         (vl-distitem-strip x)))

Theorem: vl-distitem-strip-vl-distitem-equiv-congruence-on-x

(defthm vl-distitem-strip-vl-distitem-equiv-congruence-on-x
  (implies (vl-distitem-equiv x x-equiv)
           (equal (vl-distitem-strip x)
                  (vl-distitem-strip x-equiv)))
  :rule-classes :congruence)