\f
;;; Modular functions
-;;; hash: name -> { ({(width . fun)}*) | :good }
+;;; For a documentation, see CUT-TO-WIDTH.
+
+;;; hash: name -> { :GOOD | optimizer | ({modular-fun-info}*)}
(defvar *modular-funs*
(make-hash-table :test 'eq))
+;;; hash: modular-variant -> (prototype width)
+;;;
+;;; FIXME: Reimplement with generic function names of kind
+;;; (MODULAR-VERSION prototype width)
+(defvar *modular-versions* (make-hash-table :test 'eq))
+
;;; List of increasing widths
(defvar *modular-funs-widths* nil)
(defstruct modular-fun-info
(defun find-modular-version (fun-name width)
(let ((infos (gethash fun-name *modular-funs*)))
- (if (eq infos :good)
- :good
+ (if (listp infos)
(find-if (lambda (item-width) (>= item-width width))
infos
- :key #'modular-fun-info-width))))
+ :key #'modular-fun-info-width)
+ infos)))
+
+;;; Return (VALUES prototype-name width)
+(defun modular-version-info (name)
+ (values-list (gethash name *modular-versions*)))
(defun %define-modular-fun (name lambda-list prototype width)
(let* ((infos (the list (gethash prototype *modular-funs*)))
:lambda-list lambda-list
:prototype prototype))
infos
- #'< :key #'modular-fun-info-width))))
+ #'< :key #'modular-fun-info-width)
+ (gethash name *modular-versions*)
+ (list prototype width))))
(setq *modular-funs-widths*
(merge 'list (list width) *modular-funs-widths* #'<)))
(defmacro define-good-modular-fun (name)
(check-type name symbol)
`(%define-good-modular-fun ',name))
+
+(defmacro define-modular-fun-optimizer
+ (name ((&rest lambda-list) &key (width (gensym "WIDTH")))
+ &body body)
+ (check-type name symbol)
+ (dolist (arg lambda-list)
+ (when (member arg lambda-list-keywords)
+ (error "Lambda list keyword ~S is not supported for ~
+ modular function lambda lists." arg)))
+ (with-unique-names (call args)
+ `(setf (gethash ',name *modular-funs*)
+ (lambda (,call ,width)
+ (declare (type basic-combination ,call)
+ (type (integer 0) width))
+ (let ((,args (basic-combination-args ,call)))
+ (when (= (length ,args) ,(length lambda-list))
+ (destructuring-bind ,lambda-list ,args
+ (declare (type lvar ,@lambda-list))
+ ,@body)))))))