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;;;; array-specific optimizers and transforms
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!C")
;;;; utilities for optimizing array operations
;;; GIVE-UP-IR1-TRANSFORM if the upgraded element type can't be
;;; determined.
(defun upgraded-element-type-specifier-or-give-up (lvar)
(let ((element-type-specifier (upgraded-element-type-specifier lvar)))
(if (eq element-type-specifier '*)
"upgraded array element type not known at compile time")
(defun upgraded-element-type-specifier (lvar)
(type-specifier (array-type-upgraded-element-type (lvar-type lvar))))
;;; Array access functions return an object from the array, hence its type is
;;; going to be the array upgraded element type. Secondary return value is the
;;; known supertype of the upgraded-array-element-type, if if the exact
;;; U-A-E-T is not known. (If it is NIL, the primary return value is as good
;;; as it gets.)
(defun array-type-upgraded-element-type (type)
(typecase type
;; Note that this IF mightn't be satisfied even if the runtime
;; value is known to be a subtype of some specialized ARRAY, because
;; we can have values declared e.g. (AND SIMPLE-VECTOR UNKNOWN-TYPE),
;; which are represented in the compiler as INTERSECTION-TYPE, not
;; array type.
(values (array-type-specialized-element-type type) nil))
;; Deal with intersection types (bug #316078)
(let ((intersection-types (intersection-type-types type))
(element-type *wild-type*)
(element-supertypes nil))
(dolist (intersection-type intersection-types)
(multiple-value-bind (cur-type cur-supertype)
(array-type-upgraded-element-type intersection-type)
;; According to ANSI, an array may have only one specialized
;; element type - e.g. '(and (array foo) (array bar))
;; is not a valid type unless foo and bar upgrade to the
;; same element type.
((eq cur-type *wild-type*)
((eq element-type *wild-type*)
(setf element-type cur-type))
((or (not (csubtypep cur-type element-type))
(not (csubtypep element-type cur-type)))
;; At least two different element types where given, the array
;; is valid iff they represent the same type.
;; FIXME: TYPE-INTERSECTION already takes care of disjoint array
;; types, so I believe this code should be unreachable. Maybe
;; signal a warning / error instead?
(setf element-type *empty-type*)))
(push (or cur-supertype (type-*-to-t cur-type))
(values element-type
(when (and (eq *wild-type* element-type) element-supertypes)
(apply #'type-intersection element-supertypes)))))
(let ((union-types (union-type-types type))
(element-type nil)
(element-supertypes nil))
(dolist (union-type union-types)
(multiple-value-bind (cur-type cur-supertype)
(array-type-upgraded-element-type union-type)
((eq element-type *wild-type*)
((eq element-type nil)
(setf element-type cur-type))
((or (eq cur-type *wild-type*)
;; If each of the two following tests fail, it is not
;; possible to determine the element-type of the array
;; because more than one kind of element-type was provided
;; like in '(or (array foo) (array bar)) although a
;; supertype (or foo bar) may be provided as the second
;; returned value returned. See also the KLUDGE below.
(not (csubtypep cur-type element-type))
(not (csubtypep element-type cur-type)))
(setf element-type *wild-type*)))
(push (or cur-supertype (type-*-to-t cur-type))
(values element-type
(when (eq *wild-type* element-type)
(apply #'type-union element-supertypes)))))
;; Convert member-type to an union-type.
(apply #'type-union (mapcar #'ctype-of (member-type-members type)))))
;; KLUDGE: there is no good answer here, but at least
;; *wild-type* won't cause HAIRY-DATA-VECTOR-{REF,SET} to be
;; erroneously optimized (see generic/vm-tran.lisp) -- CSR,
;; 2002-08-21
(values *wild-type* nil))))
(defun array-type-declared-element-type (type)
(if (array-type-p type)
(array-type-element-type type)
;;; The ``new-value'' for array setters must fit in the array, and the
;;; return type is going to be the same as the new-value for SETF
;;; functions.
(defun assert-new-value-type (new-value array)
(let ((type (lvar-type array)))
(when (array-type-p type)
(array-type-specialized-element-type type)
(lexenv-policy (node-lexenv (lvar-dest new-value))))))
(lvar-type new-value))
;;; Return true if ARG is NIL, or is a constant-lvar whose
;;; value is NIL, false otherwise.
(defun unsupplied-or-nil (arg)
(declare (type (or lvar null) arg))
(or (not arg)
(and (constant-lvar-p arg)
(not (lvar-value arg)))))
(defun supplied-and-true (arg)
(and arg
(constant-lvar-p arg)
(lvar-value arg)
;;;; DERIVE-TYPE optimizers
;;; Array operations that use a specific number of indices implicitly
;;; assert that the array is of that rank.
(defun assert-array-rank (array rank)
(specifier-type `(array * ,(make-list rank :initial-element '*)))
(lexenv-policy (node-lexenv (lvar-dest array)))))
(defun derive-aref-type (array)
(multiple-value-bind (uaet other)
(array-type-upgraded-element-type (lvar-type array))
(or other uaet)))
(defoptimizer (array-in-bounds-p derive-type) ((array &rest indices))
(assert-array-rank array (length indices))
(deftransform array-in-bounds-p ((array &rest subscripts))
(flet ((give-up ()
"~@<lower array bounds unknown or negative and upper bounds not ~
(bound-known-p (x)
(integerp x))) ; might be NIL or *
(block nil
(let ((dimensions (array-type-dimensions-or-give-up
(lvar-conservative-type array))))
;; shortcut for zero dimensions
(when (some (lambda (dim)
(and (bound-known-p dim) (zerop dim)))
(return nil))
;; we first collect the subscripts LVARs' bounds and see whether
;; we can already decide on the result of the optimization without
;; even taking a look at the dimensions.
(flet ((subscript-bounds (subscript)
(let* ((type1 (lvar-type subscript))
(type2 (if (csubtypep type1 (specifier-type 'integer))
(weaken-integer-type type1 :range-only t)
(low (if (integer-type-p type2)
(numeric-type-low type2)
(high (numeric-type-high type2)))
((and (or (not (bound-known-p low)) (minusp low))
(or (not (bound-known-p high)) (not (minusp high))))
;; can't be sure about the lower bound and the upper bound
;; does not give us a definite clue either.
((and (bound-known-p high) (minusp high))
(return nil)) ; definitely below lower bound (zero).
(cons low high))))))
(let* ((subscripts-bounds (mapcar #'subscript-bounds subscripts))
(subscripts-lower-bound (mapcar #'car subscripts-bounds))
(subscripts-upper-bound (mapcar #'cdr subscripts-bounds))
(in-bounds 0))
(mapcar (lambda (low high dim)
;; first deal with infinite bounds
((some (complement #'bound-known-p) (list low high dim))
(when (and (bound-known-p dim) (bound-known-p low) (<= dim low))
(return nil)))
;; now we know all bounds
((>= low dim)
(return nil))
((< high dim)
(aver (not (minusp low)))
(incf in-bounds))
(if (eql in-bounds (length dimensions))
(defoptimizer (aref derive-type) ((array &rest indices) node)
(assert-array-rank array (length indices))
(derive-aref-type array))
(defoptimizer (%aset derive-type) ((array &rest stuff))
(assert-array-rank array (1- (length stuff)))
(assert-new-value-type (car (last stuff)) array))
(macrolet ((define (name)
`(defoptimizer (,name derive-type) ((array index))
(derive-aref-type array))))
(define hairy-data-vector-ref)
(define hairy-data-vector-ref/check-bounds)
(define data-vector-ref))
#!+(or x86 x86-64)
(defoptimizer (data-vector-ref-with-offset derive-type) ((array index offset))
(derive-aref-type array))
(macrolet ((define (name)
`(defoptimizer (,name derive-type) ((array index new-value))
(assert-new-value-type new-value array))))
(define hairy-data-vector-set)
(define hairy-data-vector-set/check-bounds)
(define data-vector-set))
#!+(or x86 x86-64)
(defoptimizer (data-vector-set-with-offset derive-type) ((array index offset new-value))
(assert-new-value-type new-value array))
;;; Figure out the type of the data vector if we know the argument
;;; element type.
(defun derive-%with-array-data/mumble-type (array)
(let ((atype (lvar-type array)))
(when (array-type-p atype)
`(simple-array ,(type-specifier
(array-type-specialized-element-type atype))
(defoptimizer (%with-array-data derive-type) ((array start end))
(derive-%with-array-data/mumble-type array))
(defoptimizer (%with-array-data/fp derive-type) ((array start end))
(derive-%with-array-data/mumble-type array))
(defoptimizer (array-row-major-index derive-type) ((array &rest indices))
(assert-array-rank array (length indices))
(defoptimizer (row-major-aref derive-type) ((array index))
(derive-aref-type array))
(defoptimizer (%set-row-major-aref derive-type) ((array index new-value))
(assert-new-value-type new-value array))
(defoptimizer (make-array derive-type)
((dims &key initial-element element-type initial-contents
adjustable fill-pointer displaced-index-offset displaced-to))
(let* ((simple (and (unsupplied-or-nil adjustable)
(unsupplied-or-nil displaced-to)
(unsupplied-or-nil fill-pointer)))
(or `(,(if simple 'simple-array 'array)
,(cond ((not element-type) t)
((constant-lvar-p element-type)
(let ((ctype (careful-specifier-type
(lvar-value element-type))))
((or (null ctype) (unknown-type-p ctype)) '*)
(t (sb!xc:upgraded-array-element-type
(lvar-value element-type))))))
,(cond ((constant-lvar-p dims)
(let* ((val (lvar-value dims))
(cdims (if (listp val) val (list val))))
(if simple
(length cdims))))
((csubtypep (lvar-type dims)
(specifier-type 'integer))
(if (and (not simple)
(or (supplied-and-true adjustable)
(supplied-and-true displaced-to)
(supplied-and-true fill-pointer)))
(careful-specifier-type `(and ,spec (not simple-array)))
(careful-specifier-type spec))))
;;;; constructors
;;; Convert VECTOR into a MAKE-ARRAY.
(define-source-transform vector (&rest elements)
`(make-array ,(length elements) :initial-contents (list ,@elements)))
;;; Just convert it into a MAKE-ARRAY.
(deftransform make-string ((length &key
(element-type 'character)
`(the simple-string (make-array (the index length)
:element-type element-type
,@(when initial-element
'(:initial-element initial-element)))))
(defun rewrite-initial-contents (rank initial-contents env)
(if (plusp rank)
(if (and (consp initial-contents)
(member (car initial-contents) '(list vector sb!impl::backq-list)))
`(list ,@(mapcar (lambda (dim)
(rewrite-initial-contents (1- rank) dim env))
(cdr initial-contents)))
;; This is the important bit: once we are past the level of
;; :INITIAL-CONTENTS that relates to the array structure, reinline LIST
;; and VECTOR so that nested DX isn't screwed up.
`(locally (declare (inline list vector))
;;; Prevent open coding DIMENSION and :INITIAL-CONTENTS arguments, so that we
;;; can pick them apart in the DEFTRANSFORMS, and transform '(3) style
;;; dimensions to integer args directly.
(define-source-transform make-array (dimensions &rest keyargs &environment env)
(if (or (and (fun-lexically-notinline-p 'list)
(fun-lexically-notinline-p 'vector))
(oddp (length keyargs)))
(values nil t)
(multiple-value-bind (new-dimensions rank)
(flet ((constant-dims (dimensions)
(let* ((dims (constant-form-value dimensions env))
(canon (if (listp dims) dims (list dims)))
(rank (length canon)))
(values (if (= rank 1)
(list 'quote (car canon))
(list 'quote canon))
(cond ((sb!xc:constantp dimensions env)
(constant-dims dimensions))
((and (consp dimensions) (eq 'list dimensions))
(values dimensions (length (cdr dimensions))))
(values dimensions nil))))
(let ((initial-contents (getf keyargs :initial-contents)))
(when (and initial-contents rank)
(setf (getf keyargs :initial-contents)
(rewrite-initial-contents rank initial-contents env))))
`(locally (declare (notinline list vector))
(make-array ,new-dimensions ,@keyargs)))))
;;; This baby is a bit of a monster, but it takes care of any MAKE-ARRAY
;;; call which creates a vector with a known element type -- and tries
;;; to do a good job with all the different ways it can happen.
(defun transform-make-array-vector (length element-type initial-element
initial-contents call)
(aver (or (not element-type) (constant-lvar-p element-type)))
(let* ((c-length (when (constant-lvar-p length)
(lvar-value length)))
(elt-spec (if element-type
(lvar-value element-type)
(elt-ctype (ir1-transform-specifier-type elt-spec))
(saetp (if (unknown-type-p elt-ctype)
(give-up-ir1-transform "~S is an unknown type: ~S"
:element-type elt-spec)
(find-saetp-by-ctype elt-ctype)))
(default-initial-element (sb!vm:saetp-initial-element-default saetp))
(n-bits (sb!vm:saetp-n-bits saetp))
(typecode (sb!vm:saetp-typecode saetp))
(n-pad-elements (sb!vm:saetp-n-pad-elements saetp))
(if c-length
(ceiling (* (+ c-length n-pad-elements) n-bits)
(let ((padded-length-form (if (zerop n-pad-elements)
`(+ length ,n-pad-elements))))
((= n-bits 0) 0)
((>= n-bits sb!vm:n-word-bits)
`(* ,padded-length-form
;; i.e., not RATIO
,(the fixnum (/ n-bits sb!vm:n-word-bits))))
(let ((n-elements-per-word (/ sb!vm:n-word-bits n-bits)))
(declare (type index n-elements-per-word)) ; i.e., not RATIO
`(ceiling ,padded-length-form ,n-elements-per-word)))))))
`(simple-array ,(sb!vm:saetp-specifier saetp) (,(or c-length '*))))
`(truly-the ,result-spec
(allocate-vector ,typecode (the index length) ,n-words-form))))
(cond ((and initial-element initial-contents)
(abort-ir1-transform "Both ~S and ~S specified."
:initial-contents :initial-element))
;; :INITIAL-CONTENTS (LIST ...), (VECTOR ...) and `(1 1 ,x) with a
;; constant LENGTH.
((and initial-contents c-length
(lvar-matches initial-contents
:fun-names '(list vector sb!impl::backq-list)
:arg-count c-length))
(let ((parameters (eliminate-keyword-args
call 1 '((:element-type element-type)
(:initial-contents initial-contents))))
(elt-vars (make-gensym-list c-length))
(lambda-list '(length)))
(splice-fun-args initial-contents :any c-length)
(dolist (p parameters)
(setf lambda-list
(append lambda-list
(if (eq p 'initial-contents)
(list p)))))
`(lambda ,lambda-list
(declare (type ,elt-spec ,@elt-vars)
(ignorable ,@lambda-list))
(truly-the ,result-spec
(initialize-vector ,alloc-form ,@elt-vars)))))
((and initial-contents c-length (constant-lvar-p initial-contents))
(let ((contents (lvar-value initial-contents)))
(unless (= c-length (length contents))
(abort-ir1-transform "~S has ~S elements, vector length is ~S."
:initial-contents (length contents) c-length))
(let ((parameters (eliminate-keyword-args
call 1 '((:element-type element-type)
(:initial-contents initial-contents)))))
`(lambda (length ,@parameters)
(declare (ignorable ,@parameters))
(truly-the ,result-spec
(initialize-vector ,alloc-form
,@(map 'list (lambda (elt)
`(the ,elt-spec ',elt))
;; any other :INITIAL-CONTENTS
(let ((parameters (eliminate-keyword-args
call 1 '((:element-type element-type)
(:initial-contents initial-contents)))))
`(lambda (length ,@parameters)
(declare (ignorable ,@parameters))
(unless (= length (length initial-contents))
(error "~S has ~S elements, vector length is ~S."
:initial-contents (length initial-contents) length))
(truly-the ,result-spec
(replace ,alloc-form initial-contents)))))
;; :INITIAL-ELEMENT, not EQL to the default
((and initial-element
(or (not (constant-lvar-p initial-element))
(not (eql default-initial-element (lvar-value initial-element)))))
(let ((parameters (eliminate-keyword-args
call 1 '((:element-type element-type)
(:initial-element initial-element))))
(init (if (constant-lvar-p initial-element)
(list 'quote (lvar-value initial-element))
`(lambda (length ,@parameters)
(declare (ignorable ,@parameters))
(truly-the ,result-spec
(fill ,alloc-form (the ,elt-spec ,init))))))
;; just :ELEMENT-TYPE, or maybe with :INITIAL-ELEMENT EQL to the
;; default
(unless (ctypep default-initial-element elt-ctype)
;; This situation arises e.g. in (MAKE-ARRAY 4 :ELEMENT-TYPE
;; '(INTEGER 1 5)) ANSI's definition of MAKE-ARRAY says "If
;; INITIAL-ELEMENT is not supplied, the consequences of later
;; reading an uninitialized element of new-array are undefined,"
;; so this could be legal code as long as the user plans to
;; write before he reads, and if he doesn't we're free to do
;; anything we like. But in case the user doesn't know to write
;; elements before he reads elements (or to read manuals before
;; he writes code:-), we'll signal a STYLE-WARNING in case he
;; didn't realize this.
(if initial-element
(compiler-warn "~S ~S is not a ~S"
:initial-element default-initial-element
(compiler-style-warn "The default initial element ~S is not a ~S."
(let ((parameters (eliminate-keyword-args
call 1 '((:element-type element-type)
(:initial-element initial-element)))))
`(lambda (length ,@parameters)
(declare (ignorable ,@parameters))
;;; IMPORTANT: The order of these three MAKE-ARRAY forms matters: the least
;;; specific must come first, otherwise suboptimal transforms will result for
;;; some forms.
(deftransform make-array ((dims &key initial-element element-type
adjustable fill-pointer)
(t &rest *))
(when (null initial-element)
(let* ((eltype (cond ((not element-type) t)
((not (constant-lvar-p element-type))
"ELEMENT-TYPE is not constant."))
(lvar-value element-type))))
(eltype-type (ir1-transform-specifier-type eltype))
(saetp (find-if (lambda (saetp)
(csubtypep eltype-type (sb!vm:saetp-ctype saetp)))
(creation-form `(make-array dims
:element-type ',(type-specifier (sb!vm:saetp-ctype saetp))
,@(when fill-pointer
'(:fill-pointer fill-pointer))
,@(when adjustable
'(:adjustable adjustable)))))
(unless saetp
(give-up-ir1-transform "ELEMENT-TYPE not found in *SAETP*: ~S" eltype))
(cond ((and (constant-lvar-p initial-element)
(eql (lvar-value initial-element)
(sb!vm:saetp-initial-element-default saetp)))
;; error checking for target, disabled on the host because
;; (CTYPE-OF #\Null) is not possible.
(when (constant-lvar-p initial-element)
(let ((value (lvar-value initial-element)))
((not (ctypep value (sb!vm:saetp-ctype saetp)))
;; this case will cause an error at runtime, so we'd
;; better WARN about it now.
(warn 'array-initial-element-mismatch
:format-control "~@<~S is not a ~S (which is the ~
~S of ~S).~@:>"
(type-specifier (sb!vm:saetp-ctype saetp))
((not (ctypep value eltype-type))
;; this case will not cause an error at runtime, but
;; it's still worth STYLE-WARNing about.
(compiler-style-warn "~S is not a ~S."
value eltype)))))
`(let ((array ,creation-form))
(multiple-value-bind (vector)
(%data-vector-and-index array 0)
(fill vector (the ,(sb!vm:saetp-specifier saetp) initial-element)))
;;; The list type restriction does not ensure that the result will be a
;;; multi-dimensional array. But the lack of adjustable, fill-pointer,
;;; and displaced-to keywords ensures that it will be simple.
;;; FIXME: should we generalize this transform to non-simple (though
;;; non-displaced-to) arrays, given that we have %WITH-ARRAY-DATA to
;;; deal with those? Maybe when the DEFTRANSFORM
;;; %DATA-VECTOR-AND-INDEX in the VECTOR case problem is solved? --
;;; CSR, 2002-07-01
(deftransform make-array ((dims &key
element-type initial-element initial-contents)
(list &key
(:element-type (constant-arg *))
(:initial-element *)
(:initial-contents *))
:node call)
(block make-array
(when (lvar-matches dims :fun-names '(list) :arg-count 1)
(let ((length (car (splice-fun-args dims :any 1))))
(return-from make-array
(transform-make-array-vector length
(unless (constant-lvar-p dims)
"The dimension list is not constant; cannot open code array creation."))
(let ((dims (lvar-value dims)))
(unless (every #'integerp dims)
"The dimension list contains something other than an integer: ~S"
(if (= (length dims) 1)
`(make-array ',(car dims)
,@(when element-type
'(:element-type element-type))
,@(when initial-element
'(:initial-element initial-element))
,@(when initial-contents
'(:initial-contents initial-contents)))
(let* ((total-size (reduce #'* dims))
(rank (length dims))
(spec `(simple-array
,(cond ((null element-type) t)
((and (constant-lvar-p element-type)
(lvar-value element-type)))
(lvar-value element-type)))
(t '*))
,(make-list rank :initial-element '*))))
`(let ((header (make-array-header sb!vm:simple-array-widetag ,rank))
(data (make-array ,total-size
,@(when element-type
'(:element-type element-type))
,@(when initial-element
'(:initial-element initial-element)))))
,@(when initial-contents
;; FIXME: This is could be open coded at least a bit too
`((sb!impl::fill-data-vector data ',dims initial-contents)))
(setf (%array-fill-pointer header) ,total-size)
(setf (%array-fill-pointer-p header) nil)
(setf (%array-available-elements header) ,total-size)
(setf (%array-data-vector header) data)
(setf (%array-displaced-p header) nil)
(setf (%array-displaced-from header) nil)
,@(let ((axis -1))
(mapcar (lambda (dim)
`(setf (%array-dimension header ,(incf axis))
(truly-the ,spec header)))))))
(deftransform make-array ((dims &key element-type initial-element initial-contents)
(integer &key
(:element-type (constant-arg *))
(:initial-element *)
(:initial-contents *))
:node call)
(transform-make-array-vector dims
;;;; miscellaneous properties of arrays
;;; Transforms for various array properties. If the property is know
;;; at compile time because of a type spec, use that constant value.
;;; Most of this logic may end up belonging in code/late-type.lisp;
;;; however, here we also need the -OR-GIVE-UP for the transforms, and
;;; maybe this is just too sloppy for actual type logic. -- CSR,
;;; 2004-02-18
(defun array-type-dimensions-or-give-up (type)
(labels ((maybe-array-type-dimensions (type)
(typecase type
(array-type-dimensions type))
(let* ((types (remove nil (mapcar #'maybe-array-type-dimensions
(union-type-types type))))
(result (car types)))
(dolist (other (cdr types) result)
(unless (equal result other)
"~@<dimensions of arrays in union type ~S do not match~:@>"
(type-specifier type))))))
(let* ((types (remove nil (mapcar #'maybe-array-type-dimensions
(intersection-type-types type))))
(result (car types)))
(dolist (other (cdr types) result)
(unless (equal result other)
"~@<dimensions of arrays in intersection type ~S do not match~:@>"
(type-specifier type)))))))))
(or (maybe-array-type-dimensions type)
"~@<don't know how to extract array dimensions from type ~S~:@>"
(type-specifier type)))))
(defun conservative-array-type-complexp (type)
(typecase type
(array-type (array-type-complexp type))
(let ((types (union-type-types type)))
(aver (> (length types) 1))
(let ((result (conservative-array-type-complexp (car types))))
(dolist (type (cdr types) result)
(unless (eq (conservative-array-type-complexp type) result)
(return-from conservative-array-type-complexp :maybe))))))
;; FIXME: intersection type
(t :maybe)))
;;; If we can tell the rank from the type info, use it instead.
(deftransform array-rank ((array))
(let ((array-type (lvar-type array)))
(let ((dims (array-type-dimensions-or-give-up array-type)))
(cond ((listp dims)
(length dims))
((eq t (array-type-complexp array-type))
'(%array-rank array))
`(if (array-header-p array)
(%array-rank array)
;;; If we know the dimensions at compile time, just use it. Otherwise,
;;; if we can tell that the axis is in bounds, convert to
;;; %ARRAY-DIMENSION (which just indirects the array header) or length
;;; (if it's simple and a vector).
(deftransform array-dimension ((array axis)
(array index))
(unless (constant-lvar-p axis)
(give-up-ir1-transform "The axis is not constant."))
;; Dimensions may change thanks to ADJUST-ARRAY, so we need the
;; conservative type.
(let ((array-type (lvar-conservative-type array))
(axis (lvar-value axis)))
(let ((dims (array-type-dimensions-or-give-up array-type)))
(unless (listp dims)
"The array dimensions are unknown; must call ARRAY-DIMENSION at runtime."))
(unless (> (length dims) axis)
(abort-ir1-transform "The array has dimensions ~S, ~W is too large."
(let ((dim (nth axis dims)))
(cond ((integerp dim)
((= (length dims) 1)
(ecase (conservative-array-type-complexp array-type)
'(%array-dimension array 0))
'(vector-length array))
`(if (array-header-p array)
(%array-dimension array axis)
(vector-length array)))))
'(%array-dimension array axis)))))))
;;; If the length has been declared and it's simple, just return it.
(deftransform length ((vector)
((simple-array * (*))))
(let ((type (lvar-type vector)))
(let ((dims (array-type-dimensions-or-give-up type)))
(unless (and (listp dims) (integerp (car dims)))
"Vector length is unknown, must call LENGTH at runtime."))
(car dims))))
;;; All vectors can get their length by using VECTOR-LENGTH. If it's
;;; simple, it will extract the length slot from the vector. It it's
;;; complex, it will extract the fill pointer slot from the array
;;; header.
(deftransform length ((vector) (vector))
'(vector-length vector))
;;; If a simple array with known dimensions, then VECTOR-LENGTH is a
;;; compile-time constant.
(deftransform vector-length ((vector))
(let ((vtype (lvar-type vector)))
(let ((dim (first (array-type-dimensions-or-give-up vtype))))
(when (eq dim '*)
(when (conservative-array-type-complexp vtype)
;;; Again, if we can tell the results from the type, just use it.
;;; Otherwise, if we know the rank, convert into a computation based
;;; on array-dimension. We can wrap a TRULY-THE INDEX around the
;;; multiplications because we know that the total size must be an
;;; INDEX.
(deftransform array-total-size ((array)
(let ((array-type (lvar-type array)))
(let ((dims (array-type-dimensions-or-give-up array-type)))
(unless (listp dims)
(give-up-ir1-transform "can't tell the rank at compile time"))
(if (member '* dims)
(do ((form 1 `(truly-the index
(* (array-dimension array ,i) ,form)))
(i 0 (1+ i)))
((= i (length dims)) form))
(reduce #'* dims)))))
;;; Only complex vectors have fill pointers.
(deftransform array-has-fill-pointer-p ((array))
(let ((array-type (lvar-type array)))
(let ((dims (array-type-dimensions-or-give-up array-type)))
(if (and (listp dims) (not (= (length dims) 1)))
(ecase (conservative-array-type-complexp array-type)
"The array type is ambiguous; must call ~
ARRAY-HAS-FILL-POINTER-P at runtime.")))))))
;;; Primitive used to verify indices into arrays. If we can tell at
;;; compile-time or we are generating unsafe code, don't bother with
;;; the VOP.
(deftransform %check-bound ((array dimension index) * * :node node)
(cond ((policy node (= insert-array-bounds-checks 0))
((not (constant-lvar-p dimension))
(let ((dim (lvar-value dimension)))
;; FIXME: Can SPEED > SAFETY weaken this check to INTEGER?
`(the (integer 0 (,dim)) index)))))
;;; This checks to see whether the array is simple and the start and
;;; end are in bounds. If so, it proceeds with those values.
;;; Otherwise, it calls %WITH-ARRAY-DATA. Note that %WITH-ARRAY-DATA
;;; may be further optimized.
;;; Given any ARRAY, bind DATA-VAR to the array's data vector and
;;; START-VAR and END-VAR to the start and end of the designated
;;; portion of the data vector. SVALUE and EVALUE are any start and
;;; end specified to the original operation, and are factored into the
;;; bindings of START-VAR and END-VAR. OFFSET-VAR is the cumulative
;;; offset of all displacements encountered, and does not include
;;; When FORCE-INLINE is set, the underlying %WITH-ARRAY-DATA form is
;;; forced to be inline, overriding the ordinary judgment of the
;;; fairly picky about their arguments, figuring that if you haven't
;;; bothered to get all your ducks in a row, you probably don't care
;;; that much about speed anyway! But in some cases it makes sense to
;;; do type testing inside %WITH-ARRAY-DATA instead of outside, and
;;; the DEFTRANSFORM can't tell that that's going on, so it can make
;;; sense to use FORCE-INLINE option in that case.
(def!macro with-array-data (((data-var array &key offset-var)
(start-var &optional (svalue 0))
(end-var &optional (evalue nil))
&key force-inline check-fill-pointer)
&body forms
&environment env)
(once-only ((n-array array)
(n-svalue `(the index ,svalue))
(n-evalue `(the (or index null) ,evalue)))
(let ((check-bounds (policy env (plusp insert-array-bounds-checks))))
`(multiple-value-bind (,data-var
,@(when offset-var `(,offset-var)))
(if (not (array-header-p ,n-array))
(let ((,n-array ,n-array))
(declare (type (simple-array * (*)) ,n-array))
,(once-only ((n-len (if check-fill-pointer
`(length ,n-array)
`(array-total-size ,n-array)))
(n-end `(or ,n-evalue ,n-len)))
(if check-bounds
`(if (<= 0 ,n-svalue ,n-end ,n-len)
(values ,n-array ,n-svalue ,n-end 0)
,(if check-fill-pointer
`(sequence-bounding-indices-bad-error ,n-array ,n-svalue ,n-evalue)
`(array-bounding-indices-bad-error ,n-array ,n-svalue ,n-evalue)))
`(values ,n-array ,n-svalue ,n-end 0))))
,(if force-inline
`(%with-array-data-macro ,n-array ,n-svalue ,n-evalue
:check-bounds ,check-bounds
:check-fill-pointer ,check-fill-pointer)
(if check-fill-pointer
`(%with-array-data/fp ,n-array ,n-svalue ,n-evalue)
`(%with-array-data ,n-array ,n-svalue ,n-evalue))))
;;; This is the fundamental definition of %WITH-ARRAY-DATA, for use in
(def!macro %with-array-data-macro (array
(element-type '*)
(with-unique-names (size defaulted-end data cumulative-offset)
`(let* ((,size ,(if check-fill-pointer
`(length ,array)
`(array-total-size ,array)))
(,defaulted-end (or ,end ,size)))
,@(when check-bounds
`((unless (<= ,start ,defaulted-end ,size)
,(if check-fill-pointer
`(sequence-bounding-indices-bad-error ,array ,start ,end)
`(array-bounding-indices-bad-error ,array ,start ,end)))))
(do ((,data ,array (%array-data-vector ,data))
(,cumulative-offset 0
(+ ,cumulative-offset
(%array-displacement ,data))))
((not (array-header-p ,data))
(values (the (simple-array ,element-type 1) ,data)
(the index (+ ,cumulative-offset ,start))
(the index (+ ,cumulative-offset ,defaulted-end))
(the index ,cumulative-offset)))
(declare (type index ,cumulative-offset))))))
(defun transform-%with-array-data/muble (array node check-fill-pointer)
(let ((element-type (upgraded-element-type-specifier-or-give-up array))
(type (lvar-type array))
(check-bounds (policy node (plusp insert-array-bounds-checks))))
(if (and (array-type-p type)
(not (array-type-complexp type))
(listp (array-type-dimensions type))
(not (null (cdr (array-type-dimensions type)))))
;; If it's a simple multidimensional array, then just return
;; its data vector directly rather than going through
;; %WITH-ARRAY-DATA-MACRO. SBCL doesn't generally generate
;; code that would use this currently, but we have encouraged
;; users to use WITH-ARRAY-DATA and we may use it ourselves at
;; some point in the future for optimized libraries or
;; similar.
(if check-bounds
`(let* ((data (truly-the (simple-array ,element-type (*))
(%array-data-vector array)))
(len (length data))
(real-end (or end len)))
(unless (<= 0 start data-end lend)
(sequence-bounding-indices-bad-error array start end))
(values data 0 real-end 0))
`(let ((data (truly-the (simple-array ,element-type (*))
(%array-data-vector array))))
(values data 0 (or end (length data)) 0)))
`(%with-array-data-macro array start end
:check-fill-pointer ,check-fill-pointer
:check-bounds ,check-bounds
:element-type ,element-type))))
;; It might very well be reasonable to allow general ARRAY here, I
;; just haven't tried to understand the performance issues involved.
;; -- WHN, and also CSR 2002-05-26
(deftransform %with-array-data ((array start end)
((or vector simple-array) index (or index null) t)
:node node
:policy (> speed space))
"inline non-SIMPLE-vector-handling logic"
(transform-%with-array-data/muble array node nil))
(deftransform %with-array-data/fp ((array start end)
((or vector simple-array) index (or index null) t)
:node node
:policy (> speed space))
"inline non-SIMPLE-vector-handling logic"
(transform-%with-array-data/muble array node t))
;;;; array accessors
;;; We convert all typed array accessors into AREF and %ASET with type
;;; assertions on the array.
(macrolet ((define-bit-frob (reffer setter simplep)
(define-source-transform ,reffer (a &rest i)
`(aref (the (,',(if simplep 'simple-array 'array)
,(mapcar (constantly '*) i))
,a) ,@i))
(define-source-transform ,setter (a &rest i)
`(%aset (the (,',(if simplep 'simple-array 'array)
,(cdr (mapcar (constantly '*) i)))
,a) ,@i)))))
(define-bit-frob sbit %sbitset t)
(define-bit-frob bit %bitset nil))
(macrolet ((define-frob (reffer setter type)
(define-source-transform ,reffer (a i)
`(aref (the ,',type ,a) ,i))
(define-source-transform ,setter (a i v)
`(%aset (the ,',type ,a) ,i ,v)))))
(define-frob svref %svset simple-vector)
(define-frob schar %scharset simple-string)
(define-frob char %charset string))
(macrolet (;; This is a handy macro for computing the row-major index
;; given a set of indices. We wrap each index with a call
;; to %CHECK-BOUND to ensure that everything works out
;; correctly. We can wrap all the interior arithmetic with
;; TRULY-THE INDEX because we know the resultant
;; row-major index must be an index.
(with-row-major-index ((array indices index &optional new-value)
&rest body)
`(let (n-indices dims)
(dotimes (i (length ,indices))
(push (make-symbol (format nil "INDEX-~D" i)) n-indices)
(push (make-symbol (format nil "DIM-~D" i)) dims))
(setf n-indices (nreverse n-indices))
(setf dims (nreverse dims))
`(lambda (,',array ,@n-indices
,@',(when new-value (list new-value)))
(let* (,@(let ((,index -1))
(mapcar (lambda (name)
`(,name (array-dimension
,(incf ,index))))
,(if (null dims)
(do* ((dims dims (cdr dims))
(indices n-indices (cdr indices))
(last-dim nil (car dims))
(form `(%check-bound ,',array
,(car dims)
,(car indices))
(+ (truly-the index
(* ,form
,(car dims)
,(car indices))))))
((null (cdr dims)) form)))))
;; Just return the index after computing it.
(deftransform array-row-major-index ((array &rest indices))
(with-row-major-index (array indices index)
;; Convert AREF and %ASET into a HAIRY-DATA-VECTOR-REF (or
;; HAIRY-DATA-VECTOR-SET) with the set of indices replaced with the an
;; expression for the row major index.
(deftransform aref ((array &rest indices))
(with-row-major-index (array indices index)
(hairy-data-vector-ref array index)))
(deftransform %aset ((array &rest stuff))
(let ((indices (butlast stuff)))
(with-row-major-index (array indices index new-value)
(hairy-data-vector-set array index new-value)))))
;; For AREF of vectors we do the bounds checking in the callee. This
;; lets us do a significantly more efficient check for simple-arrays
;; without bloating the code. If we already know the type of the array
;; with sufficient precision, skip directly to DATA-VECTOR-REF.
(deftransform aref ((array index) (t t) * :node node)
(let* ((type (lvar-type array))
(element-ctype (array-type-upgraded-element-type type)))
((and (array-type-p type)
(null (array-type-complexp type))
(not (eql element-ctype *wild-type*))
(eql (length (array-type-dimensions type)) 1))
(let* ((declared-element-ctype (array-type-declared-element-type type))
`(data-vector-ref array
(%check-bound array (array-dimension array 0) index))))
(if (type= declared-element-ctype element-ctype)
`(the ,(type-specifier declared-element-ctype) ,bare-form))))
((policy node (zerop insert-array-bounds-checks))
`(hairy-data-vector-ref array index))
(t `(hairy-data-vector-ref/check-bounds array index)))))
(deftransform %aset ((array index new-value) (t t t) * :node node)
(if (policy node (zerop insert-array-bounds-checks))
`(hairy-data-vector-set array index new-value)
`(hairy-data-vector-set/check-bounds array index new-value)))
;;; But if we find out later that there's some useful type information
;;; available, switch back to the normal one to give other transforms
;;; a stab at it.
(macrolet ((define (name transform-to extra extra-type)
(declare (ignore extra-type))
`(deftransform ,name ((array index ,@extra))
(let* ((type (lvar-type array))
(element-type (array-type-upgraded-element-type type))
(declared-type (type-specifier
(array-type-declared-element-type type))))
;; If an element type has been declared, we want to
;; use that information it for type checking (even
;; if the access can't be optimized due to the array
;; not being simple).
(when (and (eql element-type *wild-type*)
;; This type logic corresponds to the special
;; case for strings in HAIRY-DATA-VECTOR-REF
;; (generic/vm-tran.lisp)
(not (csubtypep type (specifier-type 'simple-string))))
(when (or (not (array-type-p type))
;; If it's a simple array, we might be able
;; to inline the access completely.
(not (null (array-type-complexp type))))
"Upgraded element type of array is not known at compile time.")))
,(if extra
``(truly-the ,declared-type
(,',transform-to array
(%check-bound array
(array-dimension array 0)
(the ,declared-type ,@',extra)))
``(the ,declared-type
(,',transform-to array
(%check-bound array
(array-dimension array 0)
(define hairy-data-vector-ref/check-bounds
hairy-data-vector-ref nil nil)
(define hairy-data-vector-set/check-bounds
hairy-data-vector-set (new-value) (*)))
;;; Just convert into a HAIRY-DATA-VECTOR-REF (or
;;; HAIRY-DATA-VECTOR-SET) after checking that the index is inside the
;;; array total size.
(deftransform row-major-aref ((array index))
`(hairy-data-vector-ref array
(%check-bound array (array-total-size array) index)))
(deftransform %set-row-major-aref ((array index new-value))
`(hairy-data-vector-set array
(%check-bound array (array-total-size array) index)
;;;; bit-vector array operation canonicalization
;;;; We convert all bit-vector operations to have the result array
;;;; specified. This allows any result allocation to be open-coded,
;;;; and eliminates the need for any VM-dependent transforms to handle
;;;; these cases.
(macrolet ((def (fun)
(deftransform ,fun ((bit-array-1 bit-array-2
&optional result-bit-array)
(bit-vector bit-vector &optional null) *
:policy (>= speed space))
`(,',fun bit-array-1 bit-array-2
(make-array (array-dimension bit-array-1 0) :element-type 'bit)))
;; If result is T, make it the first arg.
(deftransform ,fun ((bit-array-1 bit-array-2 result-bit-array)
(bit-vector bit-vector (eql t)) *)
`(,',fun bit-array-1 bit-array-2 bit-array-1)))))
(def bit-and)
(def bit-ior)
(def bit-xor)
(def bit-eqv)
(def bit-nand)
(def bit-nor)
(def bit-andc1)
(def bit-andc2)
(def bit-orc1)
(def bit-orc2))
;;; Similar for BIT-NOT, but there is only one arg...
(deftransform bit-not ((bit-array-1 &optional result-bit-array)
(bit-vector &optional null) *
:policy (>= speed space))
'(bit-not bit-array-1
(make-array (array-dimension bit-array-1 0) :element-type 'bit)))
(deftransform bit-not ((bit-array-1 result-bit-array)
(bit-vector (eql t)))
'(bit-not bit-array-1 bit-array-1))
;;; Pick off some constant cases.
(defoptimizer (array-header-p derive-type) ((array))
(let ((type (lvar-type array)))
(cond ((not (array-type-p type))
(let ((dims (array-type-dimensions type)))
(cond ((csubtypep type (specifier-type '(simple-array * (*))))
;; no array header
(specifier-type 'null))
((and (listp dims) (/= (length dims) 1))
;; multi-dimensional array, will have a header
(specifier-type '(eql t)))
((eql (array-type-complexp type) t)
(specifier-type '(eql t)))
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