(loadw temp thing 0 lowtag)
(inst srl temp n-widetag-bits)
(inst cmp temp)
(inst b :eq bogus)
(inst sll temp (1- (integer-length n-word-bytes)))
(unless (= lowtag other-pointer-lowtag)
(loadw temp thing 0 lowtag)
(inst srl temp n-widetag-bits)
(inst cmp temp)
(inst b :eq bogus)
(inst sll temp (1- (integer-length n-word-bytes)))
(unless (= lowtag other-pointer-lowtag)