(loadw temp thing 0 lowtag)
(inst shr temp n-widetag-bits)
(inst jmp :z bogus)
(inst shl temp (1- (integer-length n-word-bytes)))
(unless (= lowtag other-pointer-lowtag)
(loadw temp thing 0 lowtag)
(inst shr temp n-widetag-bits)
(inst jmp :z bogus)
(inst shl temp (1- (integer-length n-word-bytes)))
(unless (= lowtag other-pointer-lowtag)