(unless (= extra ,(1- elements-per-word))
(inst and result ,(1- (ash 1 bits)))))))
(define-vop (,(symbolicate 'data-vector-set/ type))
(unless (= extra ,(1- elements-per-word))
(inst and result ,(1- (ash 1 bits)))))))
(define-vop (,(symbolicate 'data-vector-set/ type))