;; has a 1 bit in the same position, we're all set. Otherwise,
;; we need to subtract the pseudo-atomic bit.
(inst or ,result-tn alloc-tn ,lowtag)
;; has a 1 bit in the same position, we're all set. Otherwise,
;; we need to subtract the pseudo-atomic bit.
(inst or ,result-tn alloc-tn ,lowtag)