+(deftransform fill ((seq item &key (start 0) (end nil))
+ (vector t &key (:start t) (:end t))
+ *
+ :node node)
+ (let* ((type (lvar-type seq))
+ (element-ctype (array-type-upgraded-element-type type))
+ (element-type (type-specifier element-ctype))
+ (saetp (unless (eq *wild-type* element-ctype)
+ (find-saetp-by-ctype element-ctype))))
+ (cond ((eq *wild-type* element-ctype)
+ (delay-ir1-transform node :constraint)
+ `(vector-fill* seq item start end))
+ ((and saetp (sb!vm::valid-bit-bash-saetp-p saetp))
+ (let* ((n-bits (sb!vm:saetp-n-bits saetp))
+ (basher-name (format nil "UB~D-BASH-FILL" n-bits))
+ (basher (or (find-symbol basher-name
+ (load-time-value (find-package :sb!kernel)))
+ (abort-ir1-transform
+ "Unknown fill basher, please report to sbcl-devel: ~A"
+ basher-name)))
+ (kind (cond ((sb!vm:saetp-fixnum-p saetp) :tagged)
+ ((member element-type '(character base-char)) :char)
+ ((eq element-type 'single-float) :single-float)
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ ((eq element-type 'double-float) :double-float)
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ ((equal element-type '(complex single-float))
+ :complex-single-float)
+ (t
+ (aver (integer-type-p element-ctype))
+ :bits)))
+ ;; BASH-VALUE is a word that we can repeatedly smash
+ ;; on the array: for less-than-word sized elements it
+ ;; contains multiple copies of the fill item.
+ (bash-value
+ (if (constant-lvar-p item)
+ (let ((tmp (lvar-value item)))
+ (unless (ctypep tmp element-ctype)
+ (abort-ir1-transform "~S is not ~S" tmp element-type))
+ (let* ((bits
+ (ldb (byte n-bits 0)
+ (ecase kind
+ (:tagged
+ (ash tmp sb!vm:n-fixnum-tag-bits))
+ (:char
+ (char-code tmp))
+ (:bits
+ tmp)
+ (:single-float
+ (single-float-bits tmp))
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ (:double-float
+ (logior (ash (double-float-high-bits tmp) 32)
+ (double-float-low-bits tmp)))
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ (:complex-single-float
+ (logior (ash (single-float-bits (imagpart tmp)) 32)
+ (ldb (byte 32 0)
+ (single-float-bits (realpart tmp))))))))
+ (res bits))
+ (loop for i of-type sb!vm:word from n-bits by n-bits
+ until (= i sb!vm:n-word-bits)
+ do (setf res (ldb (byte sb!vm:n-word-bits 0)
+ (logior res (ash bits i)))))
+ res))
+ (progn
+ (delay-ir1-transform node :constraint)
+ `(let* ((bits (ldb (byte ,n-bits 0)
+ ,(ecase kind
+ (:tagged
+ `(ash item ,sb!vm:n-fixnum-tag-bits))
+ (:char
+ `(char-code item))
+ (:bits
+ `item)
+ (:single-float
+ `(single-float-bits item))
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ (:double-float
+ `(logior (ash (double-float-high-bits item) 32)
+ (double-float-low-bits item)))
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ (:complex-single-float
+ `(logior (ash (single-float-bits (imagpart item)) 32)
+ (ldb (byte 32 0)
+ (single-float-bits (realpart item))))))))
+ (res bits))
+ (declare (type sb!vm:word res))
+ ,@(unless (= sb!vm:n-word-bits n-bits)
+ `((loop for i of-type sb!vm:word from ,n-bits by ,n-bits
+ until (= i sb!vm:n-word-bits)
+ do (setf res
+ (ldb (byte ,sb!vm:n-word-bits 0)
+ (logior res (ash bits (truly-the (integer 0 ,(- sb!vm:n-word-bits n-bits)) i))))))))
+ res)))))
+ (values
+ `(with-array-data ((data seq)
+ (start start)
+ (end end)
+ :check-fill-pointer t)
+ (declare (type (simple-array ,element-type 1) data))
+ (declare (type index start end))
+ (declare (optimize (safety 0) (speed 3))
+ (muffle-conditions compiler-note))
+ (,basher ,bash-value data start (- end start))
+ seq)
+ `((declare (type ,element-type item))))))
+ ((policy node (> speed space))
+ (values
+ `(with-array-data ((data seq)
+ (start start)
+ (end end)
+ :check-fill-pointer t)
+ (declare (type (simple-array ,element-type 1) data))
+ (declare (type index start end))
+ ;; WITH-ARRAY-DATA did our range checks once and for all, so
+ ;; it'd be wasteful to check again on every AREF...
+ (declare (optimize (safety 0) (speed 3)))
+ (do ((i start (1+ i)))
+ ((= i end) seq)
+ (declare (type index i))
+ (setf (aref data i) item)))
+ ;; ... though we still need to check that the new element can fit
+ ;; into the vector in safe code. -- CSR, 2002-07-05
+ `((declare (type ,element-type item)))))
+ ((csubtypep type (specifier-type 'string))
+ '(string-fill* seq item start end))
+ (t
+ '(vector-fill* seq item start end)))))