		Search-engine friendly clone of the ACL2 documentation.

Trunc

Vl-module-trunc

Eliminate implicit truncations in assignments throughout a module.

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

Definitions and Theorems

Function: vl-module-trunc

(defun vl-module-trunc (x)
  (declare (xargs :guard (vl-module-p x)))
  (let ((__function__ 'vl-module-trunc))
    (declare (ignorable __function__))
    (b* ((x (vl-module-fix x))
         ((vl-module x) x)
         ((when (vl-module->hands-offp x)) x)
         ((when (vl-assignlist-can-skip-trunc-p x.assigns))
          x)
         (delta (vl-starting-delta x))
         (delta (change-vl-delta delta
                                 :vardecls x.vardecls))
         ((mv assigns delta)
          (vl-assignlist-trunc x.assigns delta))
         ((vl-delta delta)
          (vl-free-delta delta)))
      (change-vl-module
           x
           :vardecls delta.vardecls
           :assigns (revappend-without-guard delta.assigns assigns)
           :warnings delta.warnings))))

Theorem: vl-module-p-of-vl-module-trunc

(defthm vl-module-p-of-vl-module-trunc
  (b* ((new-x (vl-module-trunc x)))
    (vl-module-p new-x))
  :rule-classes :rewrite)

Theorem: vl-module->name-of-vl-module-trunc

(defthm vl-module->name-of-vl-module-trunc
  (equal (vl-module->name (vl-module-trunc x))
         (vl-module->name x)))

Theorem: vl-module-trunc-of-vl-module-fix-x

(defthm vl-module-trunc-of-vl-module-fix-x
  (equal (vl-module-trunc (vl-module-fix x))
         (vl-module-trunc x)))

Theorem: vl-module-trunc-vl-module-equiv-congruence-on-x

(defthm vl-module-trunc-vl-module-equiv-congruence-on-x
  (implies (vl-module-equiv x x-equiv)
           (equal (vl-module-trunc x)
                  (vl-module-trunc x-equiv)))
  :rule-classes :congruence)