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• Sv::vl-expr.lisp

Vl-bitlist->onset

Signature

(vl-bitlist->onset x) → onset

Arguments

x — Guard (vl-bitlist-p x).

Returns

onset — Type (natp onset).

Definitions and Theorems

Function: vl-bitlist->onset

(defun vl-bitlist->onset (x)
  (declare (xargs :guard (vl-bitlist-p x)))
  (let ((__function__ 'vl-bitlist->onset))
    (declare (ignorable __function__))
    (if (atom x)
        0
      (acl2::logcons (case (vl-bit-fix (car x))
                           ((:vl-0val :vl-zval) 0)
                           (t 1))
                     (vl-bitlist->onset (cdr x))))))

Theorem: natp-of-vl-bitlist->onset

(defthm natp-of-vl-bitlist->onset
  (b* ((onset (vl-bitlist->onset x)))
    (natp onset))
  :rule-classes :type-prescription)

Theorem: vl-bitlist->onset-of-vl-bitlist-fix-x

(defthm vl-bitlist->onset-of-vl-bitlist-fix-x
  (equal (vl-bitlist->onset (vl-bitlist-fix x))
         (vl-bitlist->onset x)))

Theorem: vl-bitlist->onset-vl-bitlist-equiv-congruence-on-x

(defthm vl-bitlist->onset-vl-bitlist-equiv-congruence-on-x
  (implies (vl-bitlist-equiv x x-equiv)
           (equal (vl-bitlist->onset x)
                  (vl-bitlist->onset x-equiv)))
  :rule-classes :congruence)