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Vl-maybe-range-msbidx

Extract the MSB (left) index from a resolved vl-maybe-range; treats the empty range as [0:0], i.e., its MSB is 0.

Signature

(vl-maybe-range-msbidx x) → rsh

Arguments

x — Guard (and (vl-maybe-range-p x) (vl-maybe-range-resolved-p x)).

Returns

rsh — Type (integerp rsh).

Definitions and Theorems

Function: vl-maybe-range-msbidx

(defun vl-maybe-range-msbidx (x)
  (declare (xargs :guard (and (vl-maybe-range-p x)
                              (vl-maybe-range-resolved-p x))))
  (let ((__function__ 'vl-maybe-range-msbidx))
    (declare (ignorable __function__))
    (b* (((unless x) 0))
      (vl-range-msbidx x))))

Theorem: integerp-of-vl-maybe-range-msbidx

(defthm integerp-of-vl-maybe-range-msbidx
  (b* ((rsh (vl-maybe-range-msbidx x)))
    (integerp rsh))
  :rule-classes :type-prescription)