(in-package "SB!C")
-;;; Convert into an IF so that IF optimizations will eliminate redundant
-;;; negations.
-(define-source-transform not (x) `(if ,x nil t))
-(define-source-transform null (x) `(if ,x nil t))
-
-;;; ENDP is just NULL with a LIST assertion. The assertion will be
-;;; optimized away when SAFETY optimization is low; hopefully that
-;;; is consistent with ANSI's "should return an error".
-(define-source-transform endp (x) `(null (the list ,x)))
-
;;; We turn IDENTITY into PROG1 so that it is obvious that it just
;;; returns the first value of its argument. Ditto for VALUES with one
;;; arg.
(define-source-transform identity (x) `(prog1 ,x))
(define-source-transform values (x) `(prog1 ,x))
-
;;; CONSTANTLY is pretty much never worth transforming, but it's good to get the type.
(defoptimizer (constantly derive-type) ((value))
(specifier-type
;;; whatever is right for them is right for us. FIFTH..TENTH turn into
;;; Nth, which can be expanded into a CAR/CDR later on if policy
;;; favors it.
-(define-source-transform first (x) `(car ,x))
(define-source-transform rest (x) `(cdr ,x))
(define-source-transform second (x) `(cadr ,x))
(define-source-transform third (x) `(caddr ,x))
(setf (cdr ,n-x) ,y)
,n-x)))
-(define-source-transform nth (n l) `(car (nthcdr ,n ,l)))
-
(deftransform last ((list &optional n) (t &optional t))
(let ((c (constant-lvar-p n)))
(cond ((or (not n)
,@(mapcar (lambda (x) `(values ,x)) (butlast args))
(values-list ,(car (last args))))))
-;;; When &REST argument are at play, we also have extra context and count
-;;; arguments -- convert to %VALUES-LIST-OR-CONTEXT when possible, so that the
-;;; deftransform can decide what to do after everything has been converted.
-(define-source-transform values-list (list)
- (if (symbolp list)
- (let* ((var (lexenv-find list vars))
- (info (when (lambda-var-p var)
- (lambda-var-arg-info var))))
- (if (and info
+;;;; transforming references to &REST argument
+
+;;; We add magical &MORE arguments to all functions with &REST. If ARG names
+;;; the &REST argument, this returns the lambda-vars for the context and
+;;; count.
+(defun possible-rest-arg-context (arg)
+ (when (symbolp arg)
+ (let* ((var (lexenv-find arg vars))
+ (info (when (lambda-var-p var)
+ (lambda-var-arg-info var))))
+ (when (and info
(eq :rest (arg-info-kind info))
(consp (arg-info-default info)))
- (destructuring-bind (context count &optional used) (arg-info-default info)
- (declare (ignore used))
- `(%values-list-or-context ,list ,context ,count))
- (values nil t)))
- (values nil t)))
-
-(deftransform %values-list-or-context ((list context count) * * :node node)
- (let* ((use (lvar-use list))
+ (values-list (arg-info-default info))))))
+
+(defun mark-more-context-used (rest-var)
+ (let ((info (lambda-var-arg-info rest-var)))
+ (aver (eq :rest (arg-info-kind info)))
+ (destructuring-bind (context count &optional used) (arg-info-default info)
+ (unless used
+ (setf (arg-info-default info) (list context count t))))))
+
+(defun mark-more-context-invalid (rest-var)
+ (let ((info (lambda-var-arg-info rest-var)))
+ (aver (eq :rest (arg-info-kind info)))
+ (setf (arg-info-default info) t)))
+
+;;; This determines of we the REF to a &REST variable is headed towards
+;;; parts unknown, or if we can really use the context.
+(defun rest-var-more-context-ok (lvar)
+ (let* ((use (lvar-use lvar))
(var (when (ref-p use) (ref-leaf use)))
(home (when (lambda-var-p var) (lambda-var-home var)))
- (info (when (lambda-var-p var) (lambda-var-arg-info var))))
+ (info (when (lambda-var-p var) (lambda-var-arg-info var)))
+ (restp (when info (eq :rest (arg-info-kind info)))))
(flet ((ref-good-for-more-context-p (ref)
(let ((dest (principal-lvar-end (node-lvar ref))))
(and (combination-p dest)
- ;; Uses outside VALUES-LIST will require a &REST list anyways,
- ;; to it's no use saving effort here -- plus they might modify
- ;; the list destructively.
- (eq '%values-list-or-context (lvar-fun-name (combination-fun dest)))
+ ;; If the destination is to anything but these, we're going to
+ ;; actually need the rest list -- and since other operations
+ ;; might modify the list destructively, the using the context
+ ;; isn't good anywhere else either.
+ (lvar-fun-is (combination-fun dest)
+ '(%rest-values %rest-ref %rest-length
+ %rest-null %rest-true))
;; If the home lambda is different and isn't DX, it might
;; escape -- in which case using the more context isn't safe.
(let ((clambda (node-home-lambda dest)))
(or (eq home clambda)
(leaf-dynamic-extent clambda)))))))
- (let ((context-ok
- (and info
- (consp (arg-info-default info))
- (not (lambda-var-specvar var))
- (not (lambda-var-sets var))
- (every #'ref-good-for-more-context-p (lambda-var-refs var))
- (policy node (= 3 rest-conversion)))))
- (cond (context-ok
- (destructuring-bind (context count &optional used) (arg-info-default info)
- (declare (ignore used))
- (setf (arg-info-default info) (list context count t)))
- `(%more-arg-values context 0 count))
- (t
- (when info
- (setf (arg-info-default info) t))
- `(values-list list)))))))
-
+ (let ((ok (and restp
+ (consp (arg-info-default info))
+ (not (lambda-var-specvar var))
+ (not (lambda-var-sets var))
+ (every #'ref-good-for-more-context-p (lambda-var-refs var)))))
+ (if ok
+ (mark-more-context-used var)
+ (when restp
+ (mark-more-context-invalid var)))
+ ok))))
+
+;;; VALUES-LIST -> %REST-VALUES
+(define-source-transform values-list (list)
+ (multiple-value-bind (context count) (possible-rest-arg-context list)
+ (if context
+ `(%rest-values ,list ,context ,count)
+ (values nil t))))
+
+;;; NTH -> %REST-REF
+(define-source-transform nth (n list)
+ (multiple-value-bind (context count) (possible-rest-arg-context list)
+ (if context
+ `(%rest-ref ,n ,list ,context ,count)
+ `(car (nthcdr ,n ,list)))))
+
+(define-source-transform elt (seq n)
+ (multiple-value-bind (context count) (possible-rest-arg-context seq)
+ (if context
+ `(%rest-ref ,n ,seq ,context ,count)
+ (values nil t))))
+
+;;; CAR -> %REST-REF
+(defun source-transform-car (list)
+ (multiple-value-bind (context count) (possible-rest-arg-context list)
+ (if context
+ `(%rest-ref 0 ,list ,context ,count)
+ (values nil t))))
+(define-source-transform car (list) (source-transform-car list))
+(define-source-transform first (list) (source-transform-car list))
+
+;;; LENGTH -> %REST-LENGTH
+(defun source-transform-length (list)
+ (multiple-value-bind (context count) (possible-rest-arg-context list)
+ (if context
+ `(%rest-length ,list ,context ,count)
+ (values nil t))))
+(define-source-transform length (list) (source-transform-length list))
+(define-source-transform list-length (list) (source-transform-length list))
+
+;;; ENDP, NULL and NOT -> %REST-NULL
+;;;
+;;; Outside &REST convert into an IF so that IF optimizations will eliminate
+;;; redundant negations.
+(defun source-transform-null (x op)
+ (multiple-value-bind (context count) (possible-rest-arg-context x)
+ (cond (context
+ `(%rest-null ',op ,x ,context ,count))
+ ((eq 'endp op)
+ `(if (the list ,x) nil t))
+ (t
+ `(if ,x nil t)))))
+(define-source-transform not (x) (source-transform-null x 'not))
+(define-source-transform null (x) (source-transform-null x 'null))
+(define-source-transform endp (x) (source-transform-null x 'endp))
+
+(deftransform %rest-values ((list context count))
+ (if (rest-var-more-context-ok list)
+ `(%more-arg-values context 0 count)
+ `(values-list list)))
+
+(deftransform %rest-ref ((n list context count))
+ (cond ((rest-var-more-context-ok list)
+ `(%more-arg context n))
+ ((and (constant-lvar-p n) (zerop (lvar-value n)))
+ `(car list))
+ (t
+ `(nth n list))))
+
+(deftransform %rest-length ((list context count))
+ (if (rest-var-more-context-ok list)
+ 'count
+ `(length list)))
+
+(deftransform %rest-null ((op list context count))
+ (aver (constant-lvar-p op))
+ (if (rest-var-more-context-ok list)
+ `(eql 0 count)
+ `(,(lvar-value op) list)))
+
+(deftransform %rest-true ((list context count))
+ (if (rest-var-more-context-ok list)
+ `(not (eql 0 count))
+ `list))
\f
;;;; transforming FORMAT
;;;;
projects / sbcl.git / commitdiff