1 ;;;; functions to implement arrays
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!IMPL")
15 (declaim (inline fill-pointer array-has-fill-pointer-p adjustable-array-p
18 ;;;; miscellaneous accessor functions
20 ;;; These functions are only needed by the interpreter, 'cause the
21 ;;; compiler inlines them.
22 (macrolet ((def (name)
26 (defun (setf ,name) (value array)
27 (setf (,name array) value)))))
28 (def %array-fill-pointer)
29 (def %array-fill-pointer-p)
30 (def %array-available-elements)
31 (def %array-data-vector)
32 (def %array-displacement)
33 (def %array-displaced-p)
34 (def %array-diplaced-from))
36 (defun %array-rank (array)
39 (defun %array-dimension (array axis)
40 (%array-dimension array axis))
42 (defun %set-array-dimension (array axis value)
43 (%set-array-dimension array axis value))
45 (defun %check-bound (array bound index)
46 (declare (type index bound)
48 (%check-bound array bound index))
50 (defun %with-array-data/fp (array start end)
51 (%with-array-data-macro array start end :check-bounds t :check-fill-pointer t))
53 (defun %with-array-data (array start end)
54 (%with-array-data-macro array start end :check-bounds t :check-fill-pointer nil))
56 (defun %data-vector-and-index (array index)
57 (if (array-header-p array)
58 (multiple-value-bind (vector index)
59 (%with-array-data array index nil)
60 (values vector index))
61 (values array index)))
64 (eval-when (:compile-toplevel :execute)
65 (sb!xc:defmacro pick-vector-type (type &rest specs)
66 `(cond ,@(mapcar (lambda (spec)
67 `(,(if (eq (car spec) t)
69 `(subtypep ,type ',(car spec)))
73 ;;; These functions are used in the implementation of MAKE-ARRAY for
74 ;;; complex arrays. There are lots of transforms to simplify
75 ;;; MAKE-ARRAY for various easy cases, but not for all reasonable
76 ;;; cases, so e.g. as of sbcl-0.6.6 we still make full calls to
77 ;;; MAKE-ARRAY for any non-simple array. Thus, there's some value to
78 ;;; making this somewhat efficient, at least not doing full calls to
79 ;;; SUBTYPEP in the easy cases.
80 (defun %vector-widetag-and-n-bits (type)
82 ;; Pick off some easy common cases.
84 ;; (Perhaps we should make a much more exhaustive table of easy
85 ;; common cases here. Or perhaps the effort would be better spent
86 ;; on smarter compiler transforms which do the calculation once
87 ;; and for all in any reasonable user programs.)
89 (values #.sb!vm:simple-vector-widetag #.sb!vm:n-word-bits))
90 ((base-char standard-char #!-sb-unicode character)
91 (values #.sb!vm:simple-base-string-widetag #.sb!vm:n-byte-bits))
94 (values #.sb!vm:simple-character-string-widetag #.sb!vm:n-word-bits))
96 (values #.sb!vm:simple-bit-vector-widetag 1))
97 ;; OK, we have to wade into SUBTYPEPing after all.
99 #.`(pick-vector-type type
102 `(,(sb!vm:saetp-specifier saetp)
103 (values ,(sb!vm:saetp-typecode saetp)
104 ,(sb!vm:saetp-n-bits saetp))))
105 sb!vm:*specialized-array-element-type-properties*)))))
107 (defun %complex-vector-widetag (type)
109 ;; Pick off some easy common cases.
111 #.sb!vm:complex-vector-widetag)
112 ((base-char #!-sb-unicode character)
113 #.sb!vm:complex-base-string-widetag)
116 #.sb!vm:complex-character-string-widetag)
118 #.sb!vm:complex-vector-nil-widetag)
120 #.sb!vm:complex-bit-vector-widetag)
121 ;; OK, we have to wade into SUBTYPEPing after all.
123 (pick-vector-type type
124 (nil #.sb!vm:complex-vector-nil-widetag)
126 (character #.sb!vm:complex-base-string-widetag)
128 (base-char #.sb!vm:complex-base-string-widetag)
130 (character #.sb!vm:complex-character-string-widetag)
131 (bit #.sb!vm:complex-bit-vector-widetag)
132 (t #.sb!vm:complex-vector-widetag)))))
134 (defun make-array (dimensions &key
136 (initial-element nil initial-element-p)
137 (initial-contents nil initial-contents-p)
138 adjustable fill-pointer
139 displaced-to displaced-index-offset)
140 (let* ((dimensions (if (listp dimensions) dimensions (list dimensions)))
141 (array-rank (length (the list dimensions)))
142 (simple (and (null fill-pointer)
144 (null displaced-to))))
145 (declare (fixnum array-rank))
146 (when (and displaced-index-offset (null displaced-to))
147 (error "can't specify :DISPLACED-INDEX-OFFSET without :DISPLACED-TO"))
148 (when (and displaced-to
149 (arrayp displaced-to)
150 (not (equal (array-element-type displaced-to)
151 (upgraded-array-element-type element-type))))
152 (error "Array element type of :DISPLACED-TO array does not match specified element type"))
153 (if (and simple (= array-rank 1))
154 ;; it's a (SIMPLE-ARRAY * (*))
155 (multiple-value-bind (type n-bits)
156 (%vector-widetag-and-n-bits element-type)
157 (declare (type (unsigned-byte 8) type)
158 (type (integer 0 256) n-bits))
159 (let* ((length (car dimensions))
160 (array (allocate-vector
164 (* (if (or (= type sb!vm:simple-base-string-widetag)
167 sb!vm:simple-character-string-widetag))
171 sb!vm:n-word-bits))))
172 (declare (type index length))
173 (when initial-element-p
174 (fill array initial-element))
175 (when initial-contents-p
176 (when initial-element-p
177 (error "can't specify both :INITIAL-ELEMENT and ~
179 (unless (= length (length initial-contents))
180 (error "There are ~W elements in the :INITIAL-CONTENTS, but ~
181 the vector length is ~W."
182 (length initial-contents)
184 (replace array initial-contents))
186 ;; it's either a complex array or a multidimensional array.
187 (let* ((total-size (reduce #'* dimensions))
188 (data (or displaced-to
189 (data-vector-from-inits
190 dimensions total-size element-type
191 initial-contents initial-contents-p
192 initial-element initial-element-p)))
193 (array (make-array-header
194 (cond ((= array-rank 1)
195 (%complex-vector-widetag element-type))
196 (simple sb!vm:simple-array-widetag)
197 (t sb!vm:complex-array-widetag))
200 (unless (= array-rank 1)
201 (error "Only vectors can have fill pointers."))
202 (let ((length (car dimensions)))
203 (declare (fixnum length))
204 (setf (%array-fill-pointer array)
205 (cond ((eq fill-pointer t)
208 (unless (and (fixnump fill-pointer)
210 (<= fill-pointer length))
211 ;; FIXME: should be TYPE-ERROR?
212 (error "invalid fill-pointer ~W"
215 (setf (%array-fill-pointer-p array) t))
217 (setf (%array-fill-pointer array) total-size)
218 (setf (%array-fill-pointer-p array) nil)))
219 (setf (%array-available-elements array) total-size)
220 (setf (%array-data-vector array) data)
221 (setf (%array-displaced-from array) nil)
223 (when (or initial-element-p initial-contents-p)
224 (error "Neither :INITIAL-ELEMENT nor :INITIAL-CONTENTS ~
225 can be specified along with :DISPLACED-TO"))
226 (let ((offset (or displaced-index-offset 0)))
227 (when (> (+ offset total-size)
228 (array-total-size displaced-to))
229 (error "~S doesn't have enough elements." displaced-to))
230 (setf (%array-displacement array) offset)
231 (setf (%array-displaced-p array) t)
232 (%save-displaced-array-backpointer array data)))
234 (setf (%array-displaced-p array) nil)))
236 (dolist (dim dimensions)
237 (setf (%array-dimension array axis) dim)
241 (defun make-static-vector (length &key
242 (element-type '(unsigned-byte 8))
243 (initial-contents nil initial-contents-p)
244 (initial-element nil initial-element-p))
245 "Allocate vector of LENGTH elements in static space. Only allocation
246 of specialized arrays is supported."
247 ;; STEP 1: check inputs fully
249 ;; This way of doing explicit checks before the vector is allocated
250 ;; is expensive, but probably worth the trouble as once we've allocated
251 ;; the vector we have no way to get rid of it anymore...
252 (when (eq t (upgraded-array-element-type element-type))
253 (error "Static arrays of type ~S not supported."
255 (when initial-contents-p
256 (when initial-element-p
257 (error "can't specify both :INITIAL-ELEMENT and :INITIAL-CONTENTS"))
258 (unless (= length (length initial-contents))
259 (error "There are ~W elements in the :INITIAL-CONTENTS, but the ~
260 vector length is ~W."
261 (length initial-contents)
263 (unless (every (lambda (x) (typep x element-type)) initial-contents)
264 (error ":INITIAL-CONTENTS contains elements not of type ~S."
266 (when initial-element-p
267 (unless (typep initial-element element-type)
268 (error ":INITIAL-ELEMENT ~S is not of type ~S."
269 initial-element element-type)))
272 ;; Allocate and possibly initialize the vector.
273 (multiple-value-bind (type n-bits)
274 (sb!impl::%vector-widetag-and-n-bits element-type)
276 (allocate-static-vector type length
277 (ceiling (* length n-bits)
278 sb!vm:n-word-bits))))
279 (cond (initial-element-p
280 (fill vector initial-element))
282 (replace vector initial-contents))
286 ;;; DATA-VECTOR-FROM-INITS returns a simple vector that has the
287 ;;; specified array characteristics. Dimensions is only used to pass
288 ;;; to FILL-DATA-VECTOR for error checking on the structure of
289 ;;; initial-contents.
290 (defun data-vector-from-inits (dimensions total-size element-type
291 initial-contents initial-contents-p
292 initial-element initial-element-p)
293 (when (and initial-contents-p initial-element-p)
294 (error "cannot supply both :INITIAL-CONTENTS and :INITIAL-ELEMENT to
295 either MAKE-ARRAY or ADJUST-ARRAY."))
296 (let ((data (if initial-element-p
297 (make-array total-size
298 :element-type element-type
299 :initial-element initial-element)
300 (make-array total-size
301 :element-type element-type))))
302 (cond (initial-element-p
303 (unless (simple-vector-p data)
304 (unless (typep initial-element element-type)
305 (error "~S cannot be used to initialize an array of type ~S."
306 initial-element element-type))
307 (fill (the vector data) initial-element)))
309 (fill-data-vector data dimensions initial-contents)))
312 (defun vector (&rest objects)
314 "Construct a SIMPLE-VECTOR from the given objects."
315 (coerce (the list objects) 'simple-vector))
318 ;;;; accessor/setter functions
320 ;;; Dispatch to an optimized routine the data vector accessors for
321 ;;; each different specialized vector type. Do dispatching by looking
322 ;;; up the widetag in the array rather than with the typecases, which
323 ;;; as of 1.0.5 compiles to a naive sequence of linear TYPEPs. Also
324 ;;; provide separate versions where bounds checking has been moved
325 ;;; from the callee to the caller, since it's much cheaper to do once
326 ;;; the type information is available. Finally, for each of these
327 ;;; routines also provide a slow path, taken for arrays that are not
328 ;;; vectors or not simple.
329 (macrolet ((def (name table-name)
332 (defmacro ,name (array-var)
335 (when (sb!vm::%other-pointer-p ,array-var)
336 (setf tag (%other-pointer-widetag ,array-var)))
337 ;; SYMBOL-GLOBAL-VALUE is a performance hack
338 ;; for threaded builds.
339 (svref (sb!vm::symbol-global-value ',',table-name) tag)))))))
340 (def !find-data-vector-setter *data-vector-setters*)
341 (def !find-data-vector-setter/check-bounds *data-vector-setters/check-bounds*)
342 (def !find-data-vector-reffer *data-vector-reffers*)
343 (def !find-data-vector-reffer/check-bounds *data-vector-reffers/check-bounds*))
345 (macrolet ((%ref (accessor-getter extra-params)
346 `(funcall (,accessor-getter array) array index ,@extra-params))
347 (define (accessor-name slow-accessor-name accessor-getter
348 extra-params check-bounds)
350 (defun ,accessor-name (array index ,@extra-params)
351 (declare (optimize speed
352 ;; (SAFETY 0) is ok. All calls to
353 ;; these functions are generated by
354 ;; the compiler, so argument count
355 ;; checking isn't needed. Type checking
356 ;; is done implicitly via the widetag
359 (%ref ,accessor-getter ,extra-params))
360 (defun ,slow-accessor-name (array index ,@extra-params)
361 (declare (optimize speed (safety 0)))
362 (if (not (%array-displaced-p array))
363 ;; The reasonably quick path of non-displaced complex
365 (let ((array (%array-data-vector array)))
366 (%ref ,accessor-getter ,extra-params))
367 ;; The real slow path.
371 (declare (optimize (speed 1) (safety 1)))
372 (,@check-bounds index)))
375 (declare (ignore end))
376 (,accessor-name vector index ,@extra-params)))))))
377 (define hairy-data-vector-ref slow-hairy-data-vector-ref
378 !find-data-vector-reffer
380 (define hairy-data-vector-set slow-hairy-data-vector-set
381 !find-data-vector-setter
383 (define hairy-data-vector-ref/check-bounds
384 slow-hairy-data-vector-ref/check-bounds
385 !find-data-vector-reffer/check-bounds
386 nil (%check-bound array (array-dimension array 0)))
387 (define hairy-data-vector-set/check-bounds
388 slow-hairy-data-vector-set/check-bounds
389 !find-data-vector-setter/check-bounds
390 (new-value) (%check-bound array (array-dimension array 0))))
392 (defun hairy-ref-error (array index &optional new-value)
393 (declare (ignore index new-value))
396 :expected-type 'vector))
398 ;;; Populate the dispatch tables.
399 (macrolet ((define-reffer (saetp check-form)
400 (let* ((type (sb!vm:saetp-specifier saetp))
401 (atype `(simple-array ,type (*))))
402 `(named-lambda optimized-data-vector-ref (vector index)
403 (declare (optimize speed (safety 0)))
404 (data-vector-ref (the ,atype vector)
406 (declare (optimize (safety 1)))
408 (,@check-form index)))))))
409 (define-setter (saetp check-form)
410 (let* ((type (sb!vm:saetp-specifier saetp))
411 (atype `(simple-array ,type (*))))
412 `(named-lambda optimized-data-vector-set (vector index new-value)
413 (declare (optimize speed (safety 0)))
414 (data-vector-set (the ,atype vector)
416 (declare (optimize (safety 1)))
418 (,@check-form index)))
420 ;; SPEED 1 needed to avoid the compiler
421 ;; from downgrading the type check to
423 (declare (optimize (speed 1)
425 (the ,type new-value)))
426 ;; For specialized arrays, the return from
427 ;; data-vector-set would have to be reboxed to be a
428 ;; (Lisp) return value; instead, we use the
429 ;; already-boxed value as the return.
431 (define-reffers (symbol deffer check-form slow-path)
433 (setf ,symbol (make-array sb!vm::widetag-mask
434 :initial-element #'hairy-ref-error))
435 ,@(loop for widetag in '(sb!vm:complex-vector-widetag
436 sb!vm:complex-vector-nil-widetag
437 sb!vm:complex-bit-vector-widetag
438 #!+sb-unicode sb!vm:complex-character-string-widetag
439 sb!vm:complex-base-string-widetag
440 sb!vm:simple-array-widetag
441 sb!vm:complex-array-widetag)
442 collect `(setf (svref ,symbol ,widetag) ,slow-path))
443 ,@(loop for saetp across sb!vm:*specialized-array-element-type-properties*
444 for widetag = (sb!vm:saetp-typecode saetp)
445 collect `(setf (svref ,symbol ,widetag)
446 (,deffer ,saetp ,check-form))))))
447 (defun !hairy-data-vector-reffer-init ()
448 (define-reffers *data-vector-reffers* define-reffer
450 #'slow-hairy-data-vector-ref)
451 (define-reffers *data-vector-setters* define-setter
453 #'slow-hairy-data-vector-set)
454 (define-reffers *data-vector-reffers/check-bounds* define-reffer
455 (%check-bound vector (length vector))
456 #'slow-hairy-data-vector-ref/check-bounds)
457 (define-reffers *data-vector-setters/check-bounds* define-setter
458 (%check-bound vector (length vector))
459 #'slow-hairy-data-vector-set/check-bounds)))
461 ;;; (Ordinary DATA-VECTOR-REF usage compiles into a vop, but
462 ;;; DATA-VECTOR-REF is also FOLDABLE, and this ordinary function
463 ;;; definition is needed for the compiler to use in constant folding.)
464 (defun data-vector-ref (array index)
465 (hairy-data-vector-ref array index))
467 (defun data-vector-ref-with-offset (array index offset)
468 (hairy-data-vector-ref array (+ index offset)))
470 (declaim (ftype (function (array integer integer &optional t) nil)
471 invalid-array-index-error))
472 (defun invalid-array-index-error (array index bound &optional axis)
473 (error 'invalid-array-index-error
477 :expected-type `(integer 0 (,bound))))
479 ;;; SUBSCRIPTS has a dynamic-extent list structure and is destroyed
480 (defun %array-row-major-index (array subscripts
481 &optional (invalid-index-error-p t))
482 (declare (array array)
484 (let ((rank (array-rank array)))
485 (unless (= rank (length subscripts))
486 (error "wrong number of subscripts, ~W, for array of rank ~W"
487 (length subscripts) rank))
488 (if (array-header-p array)
489 (do ((subs (nreverse subscripts) (cdr subs))
490 (axis (1- (array-rank array)) (1- axis))
494 (declare (list subs) (fixnum axis chunk-size result))
495 (let ((index (car subs))
496 (dim (%array-dimension array axis)))
497 (declare (fixnum dim))
498 (unless (and (fixnump index) (< -1 index dim))
499 (if invalid-index-error-p
500 (invalid-array-index-error array index dim axis)
501 (return-from %array-row-major-index nil)))
502 (incf result (* chunk-size (the fixnum index)))
503 (setf chunk-size (* chunk-size dim))))
504 (let ((index (first subscripts))
505 (length (length (the (simple-array * (*)) array))))
506 (unless (and (fixnump index) (< -1 index length))
507 (if invalid-index-error-p
508 (invalid-array-index-error array index length)
509 (return-from %array-row-major-index nil)))
512 (defun array-in-bounds-p (array &rest subscripts)
514 "Return T if the SUBSCIPTS are in bounds for the ARRAY, NIL otherwise."
515 (if (%array-row-major-index array subscripts nil)
518 (defun array-row-major-index (array &rest subscripts)
519 (declare (truly-dynamic-extent subscripts))
520 (%array-row-major-index array subscripts))
522 (defun aref (array &rest subscripts)
524 "Return the element of the ARRAY specified by the SUBSCRIPTS."
525 (declare (truly-dynamic-extent subscripts))
526 (row-major-aref array (%array-row-major-index array subscripts)))
528 (defun %aset (array &rest stuff)
529 (declare (truly-dynamic-extent stuff))
530 (let ((subscripts (butlast stuff))
531 (new-value (car (last stuff))))
532 (setf (row-major-aref array (%array-row-major-index array subscripts))
535 ;;; FIXME: What's supposed to happen with functions
536 ;;; like AREF when we (DEFUN (SETF FOO) ..) when
537 ;;; DEFSETF FOO is also defined? It seems as though the logical
538 ;;; thing to do would be to nuke the macro definition for (SETF FOO)
539 ;;; and replace it with the (SETF FOO) function, issuing a warning,
540 ;;; just as for ordinary functions
541 ;;; * (LISP-IMPLEMENTATION-VERSION)
542 ;;; "18a+ release x86-linux 2.4.7 6 November 1998 cvs"
543 ;;; * (DEFMACRO ZOO (X) `(+ ,X ,X))
545 ;;; * (DEFUN ZOO (X) (* 3 X))
546 ;;; Warning: ZOO previously defined as a macro.
548 ;;; But that doesn't seem to be what happens in CMU CL.
550 ;;; KLUDGE: this is probably because ANSI, in its wisdom (CLHS
551 ;;; 5.1.2.5) requires implementations to support
552 ;;; (SETF (APPLY #'AREF ...) ...)
553 ;;; [and also #'BIT and #'SBIT]. Yes, this is terrifying, and it's
554 ;;; also terrifying that this sequence of definitions causes it to
557 ;;; Also, it would be nice to make DESCRIBE FOO tell whether a symbol
558 ;;; has a setf expansion and/or a setf function defined.
560 #!-sb-fluid (declaim (inline (setf aref)))
561 (defun (setf aref) (new-value array &rest subscripts)
562 (declare (truly-dynamic-extent subscripts))
563 (declare (type array array))
564 (setf (row-major-aref array (%array-row-major-index array subscripts))
567 (defun row-major-aref (array index)
569 "Return the element of array corressponding to the row-major index. This is
571 (declare (optimize (safety 1)))
572 (row-major-aref array index))
574 (defun %set-row-major-aref (array index new-value)
575 (declare (optimize (safety 1)))
576 (setf (row-major-aref array index) new-value))
578 (defun svref (simple-vector index)
580 "Return the INDEX'th element of the given Simple-Vector."
581 (declare (optimize (safety 1)))
582 (aref simple-vector index))
584 (defun %svset (simple-vector index new)
585 (declare (optimize (safety 1)))
586 (setf (aref simple-vector index) new))
588 (defun bit (bit-array &rest subscripts)
590 "Return the bit from the BIT-ARRAY at the specified SUBSCRIPTS."
591 (declare (type (array bit) bit-array) (optimize (safety 1)))
592 (row-major-aref bit-array (%array-row-major-index bit-array subscripts)))
594 (defun %bitset (bit-array &rest stuff)
595 (declare (type (array bit) bit-array) (optimize (safety 1)))
596 (let ((subscripts (butlast stuff))
597 (new-value (car (last stuff))))
598 (setf (row-major-aref bit-array
599 (%array-row-major-index bit-array subscripts))
602 #!-sb-fluid (declaim (inline (setf bit)))
603 (defun (setf bit) (new-value bit-array &rest subscripts)
604 (declare (type (array bit) bit-array) (optimize (safety 1)))
605 (setf (row-major-aref bit-array
606 (%array-row-major-index bit-array subscripts))
609 (defun sbit (simple-bit-array &rest subscripts)
611 "Return the bit from SIMPLE-BIT-ARRAY at the specified SUBSCRIPTS."
612 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
613 (row-major-aref simple-bit-array
614 (%array-row-major-index simple-bit-array subscripts)))
616 ;;; KLUDGE: Not all these things (%SET-ROW-MAJOR-AREF, %SET-FILL-POINTER,
617 ;;; %SET-FDEFINITION, %SCHARSET, %SBITSET..) seem to deserve separate names.
618 ;;; Could we just DEFUN (SETF SBIT) etc. and get rid of the non-ANSI names?
620 (defun %sbitset (simple-bit-array &rest stuff)
621 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
622 (let ((subscripts (butlast stuff))
623 (new-value (car (last stuff))))
624 (setf (row-major-aref simple-bit-array
625 (%array-row-major-index simple-bit-array subscripts))
628 #!-sb-fluid (declaim (inline (setf sbit)))
629 (defun (setf sbit) (new-value bit-array &rest subscripts)
630 (declare (type (simple-array bit) bit-array) (optimize (safety 1)))
631 (setf (row-major-aref bit-array
632 (%array-row-major-index bit-array subscripts))
635 ;;;; miscellaneous array properties
637 (defun array-element-type (array)
639 "Return the type of the elements of the array"
640 (let ((widetag (widetag-of array)))
641 (macrolet ((pick-element-type (&rest stuff)
642 `(cond ,@(mapcar (lambda (stuff)
644 (let ((item (car stuff)))
653 `(= widetag ,item))))
656 #.`(pick-element-type
659 `(,(if (sb!vm:saetp-complex-typecode saetp)
660 (list (sb!vm:saetp-typecode saetp)
661 (sb!vm:saetp-complex-typecode saetp))
662 (sb!vm:saetp-typecode saetp))
663 ',(sb!vm:saetp-specifier saetp)))
664 sb!vm:*specialized-array-element-type-properties*)
665 ((sb!vm:simple-array-widetag
666 sb!vm:complex-vector-widetag
667 sb!vm:complex-array-widetag)
668 (with-array-data ((array array) (start) (end))
669 (declare (ignore start end))
670 (array-element-type array)))
672 (error 'type-error :datum array :expected-type 'array))))))
674 (defun array-rank (array)
676 "Return the number of dimensions of ARRAY."
677 (if (array-header-p array)
681 (defun array-dimension (array axis-number)
683 "Return the length of dimension AXIS-NUMBER of ARRAY."
684 (declare (array array) (type index axis-number))
685 (cond ((not (array-header-p array))
686 (unless (= axis-number 0)
687 (error "Vector axis is not zero: ~S" axis-number))
688 (length (the (simple-array * (*)) array)))
689 ((>= axis-number (%array-rank array))
690 (error "Axis number ~W is too big; ~S only has ~D dimension~:P."
691 axis-number array (%array-rank array)))
693 (%array-dimension array axis-number))))
695 (defun array-dimensions (array)
697 "Return a list whose elements are the dimensions of the array"
698 (declare (array array))
699 (if (array-header-p array)
700 (do ((results nil (cons (array-dimension array index) results))
701 (index (1- (array-rank array)) (1- index)))
702 ((minusp index) results))
703 (list (array-dimension array 0))))
705 (defun array-total-size (array)
707 "Return the total number of elements in the Array."
708 (declare (array array))
709 (if (array-header-p array)
710 (%array-available-elements array)
711 (length (the vector array))))
713 (defun array-displacement (array)
715 "Return the values of :DISPLACED-TO and :DISPLACED-INDEX-offset
716 options to MAKE-ARRAY, or NIL and 0 if not a displaced array."
717 (declare (type array array))
718 (if (and (array-header-p array) ; if unsimple and
719 (%array-displaced-p array)) ; displaced
720 (values (%array-data-vector array) (%array-displacement array))
723 (defun adjustable-array-p (array)
725 "Return T if (ADJUST-ARRAY ARRAY...) would return an array identical
726 to the argument, this happens for complex arrays."
727 (declare (array array))
728 ;; Note that this appears not to be a fundamental limitation.
729 ;; non-vector SIMPLE-ARRAYs are in fact capable of being adjusted,
730 ;; but in practice we test using ADJUSTABLE-ARRAY-P in ADJUST-ARRAY.
731 ;; -- CSR, 2004-03-01.
732 (not (typep array 'simple-array)))
734 ;;;; fill pointer frobbing stuff
736 (defun array-has-fill-pointer-p (array)
738 "Return T if the given ARRAY has a fill pointer, or NIL otherwise."
739 (declare (array array))
740 (and (array-header-p array) (%array-fill-pointer-p array)))
742 (defun fill-pointer-error (vector arg)
744 (aver (array-has-fill-pointer-p vector))
745 (let ((max (%array-available-elements vector)))
746 (error 'simple-type-error
748 :expected-type (list 'integer 0 max)
749 :format-control "The new fill pointer, ~S, is larger than the length of the vector (~S.)"
750 :format-arguments (list arg max))))
752 (error 'simple-type-error
754 :expected-type '(and vector (satisfies array-has-fill-pointer-p))
755 :format-control "~S is not an array with a fill pointer."
756 :format-arguments (list vector)))))
758 (defun fill-pointer (vector)
760 "Return the FILL-POINTER of the given VECTOR."
761 (if (array-has-fill-pointer-p vector)
762 (%array-fill-pointer vector)
763 (fill-pointer-error vector nil)))
765 (defun %set-fill-pointer (vector new)
767 (fill-pointer-error vector x)))
768 (if (array-has-fill-pointer-p vector)
769 (if (> new (%array-available-elements vector))
771 (setf (%array-fill-pointer vector) new))
774 ;;; FIXME: It'd probably make sense to use a MACROLET to share the
775 ;;; guts of VECTOR-PUSH between VECTOR-PUSH-EXTEND. Such a macro
776 ;;; should probably be based on the VECTOR-PUSH-EXTEND code (which is
777 ;;; new ca. sbcl-0.7.0) rather than the VECTOR-PUSH code (which dates
779 (defun vector-push (new-el array)
781 "Attempt to set the element of ARRAY designated by its fill pointer
782 to NEW-EL, and increment the fill pointer by one. If the fill pointer is
783 too large, NIL is returned, otherwise the index of the pushed element is
785 (declare (vector array))
786 (let ((fill-pointer (fill-pointer array)))
787 (declare (fixnum fill-pointer))
788 (cond ((= fill-pointer (%array-available-elements array))
791 (locally (declare (optimize (safety 0)))
792 (setf (aref array fill-pointer) new-el))
793 (setf (%array-fill-pointer array) (1+ fill-pointer))
796 (defun vector-push-extend (new-element
800 (let ((length (length vector)))
802 (- array-dimension-limit length)))))
803 (declare (vector vector) (fixnum min-extension))
804 (let ((fill-pointer (fill-pointer vector)))
805 (declare (fixnum fill-pointer))
806 (when (= fill-pointer (%array-available-elements vector))
807 (adjust-array vector (+ fill-pointer (max 1 min-extension))))
808 ;; disable bounds checking
809 (locally (declare (optimize (safety 0)))
810 (setf (aref vector fill-pointer) new-element))
811 (setf (%array-fill-pointer vector) (1+ fill-pointer))
814 (defun vector-pop (array)
816 "Decrease the fill pointer by 1 and return the element pointed to by the
818 (declare (vector array))
819 (let ((fill-pointer (fill-pointer array)))
820 (declare (fixnum fill-pointer))
821 (if (zerop fill-pointer)
822 (error "There is nothing left to pop.")
823 ;; disable bounds checking (and any fixnum test)
824 (locally (declare (optimize (safety 0)))
826 (setf (%array-fill-pointer array)
827 (1- fill-pointer)))))))
832 (defun adjust-array (array dimensions &key
833 (element-type (array-element-type array))
834 (initial-element nil initial-element-p)
835 (initial-contents nil initial-contents-p)
837 displaced-to displaced-index-offset)
839 "Adjust ARRAY's dimensions to the given DIMENSIONS and stuff."
840 (let ((dimensions (if (listp dimensions) dimensions (list dimensions))))
841 (cond ((/= (the fixnum (length (the list dimensions)))
842 (the fixnum (array-rank array)))
843 (error "The number of dimensions not equal to rank of array."))
844 ((not (subtypep element-type (array-element-type array)))
845 (error "The new element type, ~S, is incompatible with old type."
847 ((and fill-pointer (not (array-has-fill-pointer-p array)))
850 :expected-type '(satisfies array-has-fill-pointer-p))))
851 (let ((array-rank (length (the list dimensions))))
852 (declare (fixnum array-rank))
853 (unless (= array-rank 1)
855 (error "Only vectors can have fill pointers.")))
856 (cond (initial-contents-p
857 ;; array former contents replaced by INITIAL-CONTENTS
858 (if (or initial-element-p displaced-to)
859 (error "INITIAL-CONTENTS may not be specified with ~
860 the :INITIAL-ELEMENT or :DISPLACED-TO option."))
861 (let* ((array-size (apply #'* dimensions))
862 (array-data (data-vector-from-inits
863 dimensions array-size element-type
864 initial-contents initial-contents-p
865 initial-element initial-element-p)))
866 (if (adjustable-array-p array)
867 (set-array-header array array-data array-size
868 (get-new-fill-pointer array array-size
870 0 dimensions nil nil)
871 (if (array-header-p array)
872 ;; simple multidimensional or single dimensional array
873 (make-array dimensions
874 :element-type element-type
875 :initial-contents initial-contents)
878 ;; We already established that no INITIAL-CONTENTS was supplied.
879 (when initial-element
880 (error "The :INITIAL-ELEMENT option may not be specified ~
881 with :DISPLACED-TO."))
882 (unless (subtypep element-type (array-element-type displaced-to))
883 (error "can't displace an array of type ~S into another of ~
885 element-type (array-element-type displaced-to)))
886 (let ((displacement (or displaced-index-offset 0))
887 (array-size (apply #'* dimensions)))
888 (declare (fixnum displacement array-size))
889 (if (< (the fixnum (array-total-size displaced-to))
890 (the fixnum (+ displacement array-size)))
891 (error "The :DISPLACED-TO array is too small."))
892 (if (adjustable-array-p array)
893 ;; None of the original contents appear in adjusted array.
894 (set-array-header array displaced-to array-size
895 (get-new-fill-pointer array array-size
897 displacement dimensions t nil)
898 ;; simple multidimensional or single dimensional array
899 (make-array dimensions
900 :element-type element-type
901 :displaced-to displaced-to
902 :displaced-index-offset
903 displaced-index-offset))))
905 (let ((old-length (array-total-size array))
906 (new-length (car dimensions))
908 (declare (fixnum old-length new-length))
909 (with-array-data ((old-data array) (old-start)
910 (old-end old-length))
911 (cond ((or (and (array-header-p array)
912 (%array-displaced-p array))
913 (< old-length new-length))
915 (data-vector-from-inits
916 dimensions new-length element-type
917 initial-contents initial-contents-p
918 initial-element initial-element-p))
919 (replace new-data old-data
920 :start2 old-start :end2 old-end))
922 (shrink-vector old-data new-length))))
923 (if (adjustable-array-p array)
924 (set-array-header array new-data new-length
925 (get-new-fill-pointer array new-length
927 0 dimensions nil nil)
930 (let ((old-length (%array-available-elements array))
931 (new-length (apply #'* dimensions)))
932 (declare (fixnum old-length new-length))
933 (with-array-data ((old-data array) (old-start)
934 (old-end old-length))
935 (declare (ignore old-end))
936 (let ((new-data (if (or (and (array-header-p array)
937 (%array-displaced-p array))
938 (> new-length old-length))
939 (data-vector-from-inits
940 dimensions new-length
942 initial-element initial-element-p)
944 (if (or (zerop old-length) (zerop new-length))
945 (when initial-element-p (fill new-data initial-element))
946 (zap-array-data old-data (array-dimensions array)
948 new-data dimensions new-length
949 element-type initial-element
951 (if (adjustable-array-p array)
952 (set-array-header array new-data new-length
953 nil 0 dimensions nil nil)
956 sb!vm:simple-array-widetag array-rank)))
957 (set-array-header new-array new-data new-length
958 nil 0 dimensions nil t)))))))))))
961 (defun get-new-fill-pointer (old-array new-array-size fill-pointer)
962 (cond ((not fill-pointer)
963 (when (array-has-fill-pointer-p old-array)
964 (when (> (%array-fill-pointer old-array) new-array-size)
965 (error "cannot ADJUST-ARRAY an array (~S) to a size (~S) that is ~
966 smaller than its fill pointer (~S)"
967 old-array new-array-size (fill-pointer old-array)))
968 (%array-fill-pointer old-array)))
969 ((not (array-has-fill-pointer-p old-array))
970 (error "cannot supply a non-NIL value (~S) for :FILL-POINTER ~
971 in ADJUST-ARRAY unless the array (~S) was originally ~
972 created with a fill pointer"
975 ((numberp fill-pointer)
976 (when (> fill-pointer new-array-size)
977 (error "can't supply a value for :FILL-POINTER (~S) that is larger ~
978 than the new length of the vector (~S)"
979 fill-pointer new-array-size))
984 (error "bogus value for :FILL-POINTER in ADJUST-ARRAY: ~S"
987 ;;; Destructively alter VECTOR, changing its length to NEW-LENGTH,
988 ;;; which must be less than or equal to its current length. This can
989 ;;; be called on vectors without a fill pointer but it is extremely
990 ;;; dangerous to do so: shrinking the size of an object (as viewed by
991 ;;; the gc) makes bounds checking unreliable in the face of interrupts
992 ;;; or multi-threading. Call it only on provably local vectors.
993 (defun %shrink-vector (vector new-length)
994 (declare (vector vector))
995 (unless (array-header-p vector)
996 (macrolet ((frob (name &rest things)
998 ((simple-array nil (*)) (error 'nil-array-accessed-error))
999 ,@(mapcar (lambda (thing)
1000 (destructuring-bind (type-spec fill-value)
1003 (fill (truly-the ,type-spec ,name)
1005 :start new-length))))
1007 ;; Set the 'tail' of the vector to the appropriate type of zero,
1008 ;; "because in some cases we'll scavenge larger areas in one go,
1009 ;; like groups of pages that had triggered the write barrier, or
1010 ;; the whole static space" according to jsnell.
1014 `((simple-array ,(sb!vm:saetp-specifier saetp) (*))
1015 ,(if (or (eq (sb!vm:saetp-specifier saetp) 'character)
1017 (eq (sb!vm:saetp-specifier saetp) 'base-char))
1018 *default-init-char-form*
1019 (sb!vm:saetp-initial-element-default saetp))))
1021 #'sb!vm:saetp-specifier
1022 sb!vm:*specialized-array-element-type-properties*)))))
1023 ;; Only arrays have fill-pointers, but vectors have their length
1024 ;; parameter in the same place.
1025 (setf (%array-fill-pointer vector) new-length)
1028 (defun shrink-vector (vector new-length)
1029 (declare (vector vector))
1031 ((eq (length vector) new-length)
1033 ((array-has-fill-pointer-p vector)
1034 (setf (%array-fill-pointer vector) new-length)
1036 (t (subseq vector 0 new-length))))
1038 (defun %save-displaced-array-backpointer (array data)
1039 (when (array-header-p data)
1040 (let* ((old (%array-displaced-from data))
1041 (new (cons (make-weak-pointer array) old)))
1042 (loop until (eq old (%compare-and-swap-array-displaced-from data old new))
1043 do (setf old (%array-displaced-from data)
1044 new (rplacd new (remove-if-not #'weak-pointer-value old)))))))
1046 ;;; Fill in array header with the provided information, and return the array.
1047 (defun set-array-header (array data length fill-pointer displacement dimensions
1050 (setf (%array-displaced-from array) nil)
1051 ;; ANSI sayeth (ADJUST-ARRAY dictionary entry):
1053 ;; "If A is displaced to B, the consequences are unspecified if B is
1054 ;; adjusted in such a way that it no longer has enough elements to
1057 ;; so check the backpointers and signal an error if appropriate.
1058 (dolist (p (%array-displaced-from array))
1059 (let ((from (weak-pointer-value p)))
1061 (let ((requires (+ (%array-available-elements from)
1062 (%array-displacement from))))
1063 (unless (>= length requires)
1064 (error 'simple-reference-error
1065 :format-control "Cannot shrink ~S to ~S elements: displaced array ~S requires at least ~S elements."
1066 :format-arguments (list 'adjust-array length from requires))))))))
1067 (%save-displaced-array-backpointer array data)
1068 (setf (%array-data-vector array) data)
1069 (setf (%array-available-elements array) length)
1071 (setf (%array-fill-pointer array) fill-pointer)
1072 (setf (%array-fill-pointer-p array) t))
1074 (setf (%array-fill-pointer array) length)
1075 (setf (%array-fill-pointer-p array) nil)))
1076 (setf (%array-displacement array) displacement)
1077 (if (listp dimensions)
1078 (dotimes (axis (array-rank array))
1079 (declare (type index axis))
1080 (setf (%array-dimension array axis) (pop dimensions)))
1081 (setf (%array-dimension array 0) dimensions))
1082 (setf (%array-displaced-p array) displacedp)
1085 ;;; User visible extension
1086 (declaim (ftype (function (array) (values (simple-array * (*)) &optional))
1087 array-storage-vector))
1088 (defun array-storage-vector (array)
1089 "Returns the underlying storage vector of ARRAY, which must be a non-displaced array.
1091 In SBCL, if ARRAY is a of type \(SIMPLE-ARRAY * \(*)), it is its own storage
1092 vector. Multidimensional arrays, arrays with fill pointers, and adjustable
1093 arrays have an underlying storage vector with the same ARRAY-ELEMENT-TYPE as
1094 ARRAY, which this function returns.
1096 Important note: the underlying vector is an implementation detail. Even though
1097 this function exposes it, changes in the implementation may cause this
1098 function to be removed without further warning."
1099 ;; KLUDGE: Without TRULY-THE the system is not smart enough to figure out that
1100 ;; the return value is always of the known type.
1101 (truly-the (simple-array * (*))
1102 (if (array-header-p array)
1103 (if (%array-displaced-p array)
1104 (error "~S cannot be used with displaced arrays. Use ~S instead."
1105 'array-storage-vector 'array-displacement)
1106 (%array-data-vector array))
1111 ;;; temporary vector for stable sorting vectors, allocated for each new thread
1112 (defvar *merge-sort-temp-vector* (vector))
1113 (declaim (simple-vector *merge-sort-temp-vector*))
1115 ;;;; ZAP-ARRAY-DATA for ADJUST-ARRAY
1117 ;;; a temporary to be used when OLD-DATA and NEW-DATA are EQ.
1118 ;;; KLUDGE: Boy, DYNAMIC-EXTENT would be nice. This is rebound
1119 ;;; to length zero array in each new thread.
1121 ;;; DX is probably a bad idea, because a with a big array it would
1122 ;;; be fairly easy to blow the stack.
1123 (defvar *zap-array-data-temp* (vector))
1124 (declaim (simple-vector *zap-array-data-temp*))
1126 (defun zap-array-data-temp (length initial-element initial-element-p)
1127 (declare (fixnum length))
1128 (let ((tmp *zap-array-data-temp*))
1129 (declare (simple-vector tmp))
1130 (cond ((> length (length tmp))
1131 (setf *zap-array-data-temp*
1132 (if initial-element-p
1133 (make-array length :initial-element initial-element)
1134 (make-array length))))
1136 (fill tmp initial-element :end length))
1140 ;;; This does the grinding work for ADJUST-ARRAY. It zaps the data
1141 ;;; from the OLD-DATA in an arrangement specified by the OLD-DIMS to
1142 ;;; the NEW-DATA in an arrangement specified by the NEW-DIMS. OFFSET
1143 ;;; is a displaced offset to be added to computed indices of OLD-DATA.
1144 (defun zap-array-data (old-data old-dims offset new-data new-dims new-length
1145 element-type initial-element initial-element-p)
1146 (declare (list old-dims new-dims))
1147 ;; OLD-DIMS comes from array-dimensions, which returns a fresh list
1148 ;; at least in SBCL.
1149 ;; NEW-DIMS comes from the user.
1150 (setf old-dims (nreverse old-dims)
1151 new-dims (reverse new-dims))
1152 (cond ((eq old-data new-data)
1153 ;; NEW-LENGTH, ELEMENT-TYPE, INITIAL-ELEMENT, and
1154 ;; INITIAL-ELEMENT-P are used when OLD-DATA and NEW-DATA are
1155 ;; EQ; in this case, a temporary must be used and filled
1156 ;; appropriately. specified initial-element.
1157 (when initial-element-p
1158 ;; FIXME: transforming this TYPEP to someting a bit faster
1159 ;; would be a win...
1160 (unless (typep initial-element element-type)
1161 (error "~S can't be used to initialize an array of type ~S."
1162 initial-element element-type)))
1163 (let ((temp (zap-array-data-temp new-length
1164 initial-element initial-element-p)))
1165 (declare (simple-vector temp))
1166 (zap-array-data-aux old-data old-dims offset temp new-dims)
1167 (dotimes (i new-length)
1168 (setf (aref new-data i) (aref temp i)
1169 ;; zero out any garbage right away
1172 ;; When OLD-DATA and NEW-DATA are not EQ, NEW-DATA has
1173 ;; already been filled with any
1174 (zap-array-data-aux old-data old-dims offset new-data new-dims))))
1176 (defun zap-array-data-aux (old-data old-dims offset new-data new-dims)
1177 (declare (fixnum offset))
1178 (let ((limits (mapcar (lambda (x y)
1179 (declare (fixnum x y))
1180 (1- (the fixnum (min x y))))
1181 old-dims new-dims)))
1182 (macrolet ((bump-index-list (index limits)
1183 `(do ((subscripts ,index (cdr subscripts))
1184 (limits ,limits (cdr limits)))
1185 ((null subscripts) :eof)
1186 (cond ((< (the fixnum (car subscripts))
1187 (the fixnum (car limits)))
1189 (1+ (the fixnum (car subscripts))))
1191 (t (rplaca subscripts 0))))))
1192 (do ((index (make-list (length old-dims) :initial-element 0)
1193 (bump-index-list index limits)))
1195 (setf (aref new-data (row-major-index-from-dims index new-dims))
1197 (+ (the fixnum (row-major-index-from-dims index old-dims))
1200 ;;; Figure out the row-major-order index of an array reference from a
1201 ;;; list of subscripts and a list of dimensions. This is for internal
1202 ;;; calls only, and the subscripts and dim-list variables are assumed
1203 ;;; to be reversed from what the user supplied.
1204 (defun row-major-index-from-dims (rev-subscripts rev-dim-list)
1205 (do ((rev-subscripts rev-subscripts (cdr rev-subscripts))
1206 (rev-dim-list rev-dim-list (cdr rev-dim-list))
1209 ((null rev-dim-list) result)
1210 (declare (fixnum chunk-size result))
1211 (setq result (+ result
1212 (the fixnum (* (the fixnum (car rev-subscripts))
1214 (setq chunk-size (* chunk-size (the fixnum (car rev-dim-list))))))
1218 (defun bit-array-same-dimensions-p (array1 array2)
1219 (declare (type (array bit) array1 array2))
1220 (and (= (array-rank array1)
1221 (array-rank array2))
1222 (dotimes (index (array-rank array1) t)
1223 (when (/= (array-dimension array1 index)
1224 (array-dimension array2 index))
1227 (defun pick-result-array (result-bit-array bit-array-1)
1228 (case result-bit-array
1230 ((nil) (make-array (array-dimensions bit-array-1)
1232 :initial-element 0))
1234 (unless (bit-array-same-dimensions-p bit-array-1
1236 (error "~S and ~S don't have the same dimensions."
1237 bit-array-1 result-bit-array))
1240 (defmacro def-bit-array-op (name function)
1241 `(defun ,name (bit-array-1 bit-array-2 &optional result-bit-array)
1244 "Perform a bit-wise ~A on the elements of BIT-ARRAY-1 and ~
1245 BIT-ARRAY-2,~% putting the results in RESULT-BIT-ARRAY. ~
1246 If RESULT-BIT-ARRAY is T,~% BIT-ARRAY-1 is used. If ~
1247 RESULT-BIT-ARRAY is NIL or omitted, a new array is~% created. ~
1248 All the arrays must have the same rank and dimensions."
1249 (symbol-name function))
1250 (declare (type (array bit) bit-array-1 bit-array-2)
1251 (type (or (array bit) (member t nil)) result-bit-array))
1252 (unless (bit-array-same-dimensions-p bit-array-1 bit-array-2)
1253 (error "~S and ~S don't have the same dimensions."
1254 bit-array-1 bit-array-2))
1255 (let ((result-bit-array (pick-result-array result-bit-array bit-array-1)))
1256 (if (and (simple-bit-vector-p bit-array-1)
1257 (simple-bit-vector-p bit-array-2)
1258 (simple-bit-vector-p result-bit-array))
1259 (locally (declare (optimize (speed 3) (safety 0)))
1260 (,name bit-array-1 bit-array-2 result-bit-array))
1261 (with-array-data ((data1 bit-array-1) (start1) (end1))
1262 (declare (ignore end1))
1263 (with-array-data ((data2 bit-array-2) (start2) (end2))
1264 (declare (ignore end2))
1265 (with-array-data ((data3 result-bit-array) (start3) (end3))
1266 (do ((index-1 start1 (1+ index-1))
1267 (index-2 start2 (1+ index-2))
1268 (index-3 start3 (1+ index-3)))
1269 ((>= index-3 end3) result-bit-array)
1270 (declare (type index index-1 index-2 index-3))
1271 (setf (sbit data3 index-3)
1272 (logand (,function (sbit data1 index-1)
1273 (sbit data2 index-2))
1276 (def-bit-array-op bit-and logand)
1277 (def-bit-array-op bit-ior logior)
1278 (def-bit-array-op bit-xor logxor)
1279 (def-bit-array-op bit-eqv logeqv)
1280 (def-bit-array-op bit-nand lognand)
1281 (def-bit-array-op bit-nor lognor)
1282 (def-bit-array-op bit-andc1 logandc1)
1283 (def-bit-array-op bit-andc2 logandc2)
1284 (def-bit-array-op bit-orc1 logorc1)
1285 (def-bit-array-op bit-orc2 logorc2)
1287 (defun bit-not (bit-array &optional result-bit-array)
1289 "Performs a bit-wise logical NOT on the elements of BIT-ARRAY,
1290 putting the results in RESULT-BIT-ARRAY. If RESULT-BIT-ARRAY is T,
1291 BIT-ARRAY is used. If RESULT-BIT-ARRAY is NIL or omitted, a new array is
1292 created. Both arrays must have the same rank and dimensions."
1293 (declare (type (array bit) bit-array)
1294 (type (or (array bit) (member t nil)) result-bit-array))
1295 (let ((result-bit-array (pick-result-array result-bit-array bit-array)))
1296 (if (and (simple-bit-vector-p bit-array)
1297 (simple-bit-vector-p result-bit-array))
1298 (locally (declare (optimize (speed 3) (safety 0)))
1299 (bit-not bit-array result-bit-array))
1300 (with-array-data ((src bit-array) (src-start) (src-end))
1301 (declare (ignore src-end))
1302 (with-array-data ((dst result-bit-array) (dst-start) (dst-end))
1303 (do ((src-index src-start (1+ src-index))
1304 (dst-index dst-start (1+ dst-index)))
1305 ((>= dst-index dst-end) result-bit-array)
1306 (declare (type index src-index dst-index))
1307 (setf (sbit dst dst-index)
1308 (logxor (sbit src src-index) 1))))))))