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Range-tools

Vl-maybe-range-size

Usual way to compute the width of a net/reg, given its range.

Signature
(vl-maybe-range-size x) → size
Arguments: x — Guard (vl-maybe-range-p x).
Returns: size — Type (posp size).

If x is the range of a net declaration or register declaration, this function returns its width. That is, if there is a range then the width of this wire or register is the size of the range. And otherwise, it is a single-bit wide.

Definitions and Theorems

Function: vl-maybe-range-size

(defun vl-maybe-range-size (x)
  (declare (xargs :guard (vl-maybe-range-p x)))
  (declare (xargs :guard (vl-maybe-range-resolved-p x)))
  (let ((__function__ 'vl-maybe-range-size))
    (declare (ignorable __function__))
    (if (not x) 1 (vl-range-size x))))

Theorem: posp-of-vl-maybe-range-size

(defthm posp-of-vl-maybe-range-size
  (b* ((size (vl-maybe-range-size x)))
    (posp size))
  :rule-classes :type-prescription)

Theorem: vl-maybe-range-size-of-vl-maybe-range-fix-x

(defthm vl-maybe-range-size-of-vl-maybe-range-fix-x
  (equal (vl-maybe-range-size (vl-maybe-range-fix x))
         (vl-maybe-range-size x)))

Theorem: vl-maybe-range-size-vl-maybe-range-equiv-congruence-on-x

(defthm vl-maybe-range-size-vl-maybe-range-equiv-congruence-on-x
  (implies (vl-maybe-range-equiv x x-equiv)
           (equal (vl-maybe-range-size x)
                  (vl-maybe-range-size x-equiv)))
  :rule-classes :congruence)