- (initial-element default-init-char))
- (if (byte-compiling)
- (values nil t)
- `(make-array (the index ,length)
- :element-type ,element-type
- :initial-element ,initial-element)))
-
-(defparameter *array-info*
- #((base-char #.default-init-char 8 sb!vm:simple-string-type)
- (single-float 0.0s0 32 sb!vm:simple-array-single-float-type)
- (double-float 0.0d0 64 sb!vm:simple-array-double-float-type)
- #!+long-float (long-float 0.0l0 #!+x86 96 #!+sparc 128
- sb!vm:simple-array-long-float-type)
- (bit 0 1 sb!vm:simple-bit-vector-type)
- ((unsigned-byte 2) 0 2 sb!vm:simple-array-unsigned-byte-2-type)
- ((unsigned-byte 4) 0 4 sb!vm:simple-array-unsigned-byte-4-type)
- ((unsigned-byte 8) 0 8 sb!vm:simple-array-unsigned-byte-8-type)
- ((unsigned-byte 16) 0 16 sb!vm:simple-array-unsigned-byte-16-type)
- ((unsigned-byte 32) 0 32 sb!vm:simple-array-unsigned-byte-32-type)
- ((signed-byte 8) 0 8 sb!vm:simple-array-signed-byte-8-type)
- ((signed-byte 16) 0 16 sb!vm:simple-array-signed-byte-16-type)
- ((signed-byte 30) 0 32 sb!vm:simple-array-signed-byte-30-type)
- ((signed-byte 32) 0 32 sb!vm:simple-array-signed-byte-32-type)
- ((complex single-float) #C(0.0s0 0.0s0) 64
- sb!vm:simple-array-complex-single-float-type)
- ((complex double-float) #C(0.0d0 0.0d0) 128
- sb!vm:simple-array-complex-double-float-type)
- #!+long-float
- ((complex long-float) #C(0.0l0 0.0l0) #!+x86 192 #!+sparc 256
- sb!vm:simple-array-complex-long-float-type)
- (t 0 32 sb!vm:simple-vector-type)))
+ (initial-element
+ '#.*default-init-char-form*))
+ `(make-array (the index ,length)
+ :element-type ,element-type
+ :initial-element ,initial-element))
+
+(defstruct (specialized-array-element-type-properties
+ (:conc-name saetp-)
+ (:constructor !make-saetp (ctype
+ initial-element-default
+ n-bits
+ typecode
+ &key
+ (n-pad-elements 0)))
+ (:copier nil))
+ ;; the element type, e.g. #<BUILT-IN-CLASS BASE-CHAR (sealed)> or
+ ;; #<SB-KERNEL:NUMERIC-TYPE (UNSIGNED-BYTE 4)>
+ (ctype (missing-arg) :type ctype :read-only t)
+ ;; what we get when the low-level vector-creation logic zeroes all
+ ;; the bits (which also serves as the default value of MAKE-ARRAY's
+ ;; :INITIAL-ELEMENT keyword)
+ (initial-element-default (missing-arg) :read-only t)
+ ;; how many bits per element
+ (n-bits (missing-arg) :type index :read-only t)
+ ;; the low-level type code
+ (typecode (missing-arg) :type index :read-only t)
+ ;; the number of extra elements we use at the end of the array for
+ ;; low level hackery (e.g., one element for arrays of BASE-CHAR,
+ ;; which is used for a fixed #\NULL so that when we call out to C
+ ;; we don't need to cons a new copy)
+ (n-pad-elements (missing-arg) :type index :read-only t))
+
+(defparameter *specialized-array-element-type-properties*
+ (map 'simple-vector
+ (lambda (args)
+ (destructuring-bind (type-spec &rest rest) args
+ (let ((ctype (specifier-type type-spec)))
+ (apply #'!make-saetp ctype rest))))
+ `((base-char ,(code-char 0) 8 ,sb!vm:simple-string-widetag
+ ;; (SIMPLE-STRINGs are stored with an extra trailing
+ ;; #\NULL for convenience in calling out to C.)
+ :n-pad-elements 1)
+ (single-float 0.0s0 32 ,sb!vm:simple-array-single-float-widetag)
+ (double-float 0.0d0 64 ,sb!vm:simple-array-double-float-widetag)
+ #!+long-float (long-float 0.0L0 #!+x86 96 #!+sparc 128
+ ,sb!vm:simple-array-long-float-widetag)
+ (bit 0 1 ,sb!vm:simple-bit-vector-widetag)
+ ((unsigned-byte 2) 0 2 ,sb!vm:simple-array-unsigned-byte-2-widetag)
+ ((unsigned-byte 4) 0 4 ,sb!vm:simple-array-unsigned-byte-4-widetag)
+ ((unsigned-byte 8) 0 8 ,sb!vm:simple-array-unsigned-byte-8-widetag)
+ ((unsigned-byte 16) 0 16 ,sb!vm:simple-array-unsigned-byte-16-widetag)
+ ((unsigned-byte 32) 0 32 ,sb!vm:simple-array-unsigned-byte-32-widetag)
+ ((signed-byte 8) 0 8 ,sb!vm:simple-array-signed-byte-8-widetag)
+ ((signed-byte 16) 0 16 ,sb!vm:simple-array-signed-byte-16-widetag)
+ ((signed-byte 30) 0 32 ,sb!vm:simple-array-signed-byte-30-widetag)
+ ((signed-byte 32) 0 32 ,sb!vm:simple-array-signed-byte-32-widetag)
+ ((complex single-float) #C(0.0s0 0.0s0) 64
+ ,sb!vm:simple-array-complex-single-float-widetag)
+ ((complex double-float) #C(0.0d0 0.0d0) 128
+ ,sb!vm:simple-array-complex-double-float-widetag)
+ #!+long-float ((complex long-float) #C(0.0L0 0.0L0)
+ #!+x86 192 #!+sparc 256
+ ,sb!vm:simple-array-complex-long-float-widetag)
+ (t 0 32 ,sb!vm:simple-vector-widetag))))