- (sizebits (read-byte-arg))
- (type (case sizebits
- (0 sb!vm:simple-array-nil-widetag)
- (1 sb!vm:simple-bit-vector-widetag)
- (2 sb!vm:simple-array-unsigned-byte-2-widetag)
- (4 sb!vm:simple-array-unsigned-byte-4-widetag)
- (7 (prog1 sb!vm:simple-array-unsigned-byte-7-widetag
- (setf sizebits 8)))
- (8 sb!vm:simple-array-unsigned-byte-8-widetag)
- (15 (prog1 sb!vm:simple-array-unsigned-byte-15-widetag
- (setf sizebits 16)))
- (16 sb!vm:simple-array-unsigned-byte-16-widetag)
- (31 (prog1 sb!vm:simple-array-unsigned-byte-31-widetag
- (setf sizebits 32)))
- (32 sb!vm:simple-array-unsigned-byte-32-widetag)
- #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
- (63 (prog1 sb!vm:simple-array-unsigned-byte-63-widetag
- (setf sizebits 64)))
- #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
- (64 sb!vm:simple-array-unsigned-byte-64-widetag)
- (t (error "losing element size: ~W" sizebits))))
- (result (allocate-vector-object *dynamic* sizebits len type))
+ (type (read-byte-arg))
+ (sizebits (aref **saetp-bits-per-length** type))
+ (result (progn (aver (< sizebits 255))
+ (allocate-vector-object *dynamic* sizebits len type)))