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Vl-make-index

Safely create a constant integer atom whose value is n.

Signature

(vl-make-index n) → index

Arguments

n — Guard (integerp n).

Returns

index — Type (vl-expr-p index).

The expression we create doesn't have a type, because it would depend on the context. In many cases it might suffice to use an integer type; in this case see vl-make-integer.

Definitions and Theorems

Function: vl-make-index

(defun vl-make-index (n)
 (declare (xargs :guard (integerp n)))
 (let ((__function__ 'vl-make-index))
  (declare (ignorable __function__))
  (let* ((value (lifix n))
         (width (+ 1 (integer-length value))))
   (if
    (<= width 31)
    (hons-copy
      (make-vl-literal
           :val (make-vl-constint :origwidth 32
                                  :origsign :vl-signed
                                  :wasunsized t
                                  :value (acl2::loghead 32 value))))
    (hons-copy
     (make-vl-literal
         :val
         (make-vl-constint :origwidth width
                           :origsign :vl-signed
                           :value (acl2::loghead width value))))))))

Theorem: vl-expr-p-of-vl-make-index

(defthm vl-expr-p-of-vl-make-index
  (b* ((index (vl-make-index n)))
    (vl-expr-p index))
  :rule-classes :rewrite)

Theorem: vl-expr-kind-of-vl-make-index

(defthm vl-expr-kind-of-vl-make-index
  (eq (vl-expr-kind (vl-make-index n))
      :vl-literal))

Theorem: vl-expr-resolved-p-of-vl-make-index

(defthm vl-expr-resolved-p-of-vl-make-index
  (vl-expr-resolved-p (vl-make-index n)))

Theorem: vl-resolved->val-of-vl-make-index

(defthm vl-resolved->val-of-vl-make-index
  (equal (vl-resolved->val (vl-make-index n))
         (ifix n)))

Theorem: vl-make-index-of-ifix-n

(defthm vl-make-index-of-ifix-n
  (equal (vl-make-index (ifix n))
         (vl-make-index n)))

Theorem: vl-make-index-int-equiv-congruence-on-n

(defthm vl-make-index-int-equiv-congruence-on-n
  (implies (acl2::int-equiv n n-equiv)
           (equal (vl-make-index n)
                  (vl-make-index n-equiv)))
  :rule-classes :congruence)