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328 lines
11 KiB
Common Lisp
328 lines
11 KiB
Common Lisp
;;;; -*- Mode: Lisp; Syntax: Common-Lisp; Package: C -*-
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;;;;
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;;;; Copyright (c) 1984, Taiichi Yuasa and Masami Hagiya.
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;;;; Copyright (c) 1990, Giuseppe Attardi.
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;;;;
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;;;; This program is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Library General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2 of the License, or (at your option) any later version.
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;;;;
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;;;; See file '../Copyright' for full details.
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;;;; CMPINLINE Open coding optimizer.
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(in-package "COMPILER")
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;;; Valid property names for open coded functions are:
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;;; :INLINE-ALWAYS
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;;; :INLINE-SAFE safe-compile only
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;;; :INLINE-UNSAFE non-safe-compile only
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;;;
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;;; Each property is a list of 'inline-info's, where each inline-info is:
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;;; ( types { type | boolean } { string | function } ).
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;;;
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;;; For each open-codable function, open coding will occur only if there exits
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;;; an appropriate property with the argument types equal to 'types' and with
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;;; the return-type equal to 'type'. The third element
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;;; is T if and only if side effects may occur by the call of the function.
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;;; Even if *DESTINATION* is TRASH, open code for such a function with side
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;;; effects must be included in the compiled code.
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;;; The forth element is T if and only if the result value is a new Lisp
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;;; object, i.e., it must be explicitly protected against GBC.
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;;;
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;;; inline-args:
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;;; returns a list of pairs (type loc)
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;;; side effects: emits code for temporary variables
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;;;
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;;; Whoever calls inline-args must bind *inline-blocks* to 0 and afterwards
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;;; call close-inline-blocks
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;;;
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(defun inline-args (forms &optional types)
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(flet ((all-locations (args &aux (res t))
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(dolist (arg args res)
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(unless (member (c1form-name arg)
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'(LOCATION VAR SYS:STRUCTURE-REF
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#+clos SYS:INSTANCE-REF)
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:test #'eq)
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(setq res nil)))))
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(do ((forms forms (cdr forms))
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(form) (locs))
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((endp forms) (nreverse locs))
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(setq form (car forms))
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(case (c1form-name form)
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(LOCATION
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(push (list (c1form-primary-type form) (c1form-arg 0 form)) locs))
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(VAR
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(let ((var (c1form-arg 0 form)))
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(if (var-changed-in-form-list var (cdr forms))
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(let* ((var-rep-type (var-rep-type var))
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(lcl (make-lcl-var :rep-type var-rep-type :type (var-type var))))
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(wt-nl "{" (rep-type-name var-rep-type) " " lcl "= " var ";")
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(push (list (c1form-primary-type form) lcl) locs)
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(incf *inline-blocks*))
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(push (list (c1form-primary-type form) var) locs))))
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(CALL-GLOBAL
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(let* ((fname (c1form-arg 0 form))
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(args (c1form-arg 1 form))
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(return-type (c1form-primary-type form))
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(arg-locs (inline-args args))
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(loc (inline-function fname arg-locs return-type)))
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(if loc
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;; If there are side effects, we may not move the C form
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;; around and we have to save its value in a variable.
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;; We use a variable of type out-type to save the value
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;; if (return-type >= out-type)
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;; then
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;; coerce the value to out-type
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;; otherwise
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;; save the value without coercion and return the
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;; variable tagged with and-type,
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;; so that whoever uses it may coerce it to such type
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(let* ((and-type (type-and return-type (loc-type loc)))
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(out-rep-type (loc-representation-type loc))
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(var (make-lcl-var :rep-type out-rep-type :type and-type)))
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(wt-nl "{" (rep-type-name out-rep-type) " " var "= " loc ";")
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(incf *inline-blocks*)
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(setq loc var)
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(push (list (loc-type loc) loc) locs))
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;; FIXME! Why is (make-temp-var) before rebinding of *temp*???
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(let* ((temp (make-temp-var))
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;; bindings like c1expr*
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(*exit* (next-label))
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(*unwind-exit* (cons *exit* *unwind-exit*))
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(*lcl* *lcl*)
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(*temp* *temp*)
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(*destination* temp))
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(call-global fname nil nil arg-locs return-type)
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(wt-label *exit*)
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(push
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(list (if (subtypep 'T return-type)
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(or (get-return-type fname) 'T)
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return-type)
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temp)
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locs)))))
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(SYS:STRUCTURE-REF
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(let ((type (c1form-primary-type form)))
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(if (args-cause-side-effect (cdr forms))
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(let* ((temp (make-temp-var))
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(*destination* temp))
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(c2expr* form)
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(push (list type temp) locs))
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(push (list type
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(list 'SYS:STRUCTURE-REF
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(first (coerce-locs
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(inline-args (list (c1form-arg 0 form)))))
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(c1form-arg 1 form)
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(c1form-arg 2 form)))
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locs))))
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#+clos
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(SYS:INSTANCE-REF
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(let ((type (c1form-primary-type form)))
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(if (args-cause-side-effect (cdr forms))
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(let* ((temp (make-temp-var))
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(*destination* temp))
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(c2expr* form)
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(push (list type temp) locs))
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(push (list type
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(list 'SYS:INSTANCE-REF
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(first (coerce-locs
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(inline-args (list (c1form-arg 0 form)))))
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(c1form-arg 1 form)
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#+nil (c1form-arg 2 form))) ; JJGR
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locs))))
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(SETQ
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(let ((vref (c1form-arg 0 form))
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(form1 (c1form-arg 1 form)))
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(let ((*destination* vref)) (c2expr* form1))
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(if (eq (c1form-name form1) 'LOCATION)
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(push (list (c1form-primary-type form1) (c1form-arg 0 form1)) locs)
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(setq forms (list* nil ; discarded at iteration
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(make-c1form 'VAR form vref)
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(cdr forms))
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))))
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(t (let ((temp (make-temp-var)))
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(let ((*destination* temp)) (c2expr* form))
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(push (list (c1form-primary-type form) temp) locs))))))
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)
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(defun destination-type ()
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(rep-type->lisp-type (loc-representation-type *destination*))
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;;(loc-type *destination*)
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)
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;;;
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;;; inline-function:
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;;; locs are typed locs as produced by inline-args
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;;; returns NIL if inline expansion of the function is not possible
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;;;
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(defun inline-function (fname inlined-locs return-type)
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;; Those functions that use INLINE-FUNCTION must rebind
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;; the variable *INLINE-BLOCKS*.
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(and (inline-possible fname)
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(not (get-sysprop fname 'C2))
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(let* ((ii (get-inline-info fname (mapcar #'first inlined-locs)
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(type-and return-type (destination-type)))))
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(when ii
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(let* ((arg-types (inline-info-arg-types ii))
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(out-rep-type (inline-info-return-rep-type ii))
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(out-type (inline-info-return-type ii))
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(side-effects-p (function-may-have-side-effects fname))
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(fun (inline-info-expansion ii))
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(one-liner (inline-info-one-liner ii)))
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(produce-inline-loc inlined-locs arg-types (list out-rep-type)
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fun side-effects-p one-liner))))))
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(defun get-inline-info (fname types return-type &aux ii iia)
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(declare (si::c-local))
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(dolist (x *inline-functions*)
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(when (and (eq (car x) fname)
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(setq ii (inline-type-matches (cdr x) types return-type)))
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(return-from get-inline-info ii)))
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(dolist (x (get-sysprop fname (if (safe-compile)
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':INLINE-SAFE
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':INLINE-UNSAFE)))
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(when (setq ii (inline-type-matches x types return-type))
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(return)))
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(dolist (x (get-sysprop fname ':INLINE-ALWAYS))
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(when (setq iia (inline-type-matches x types return-type))
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(return)))
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(if (and ii iia)
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;; Choose the most specific inline form if two available
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(if (and (every #'type>=
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(inline-info-arg-types ii)
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(inline-info-arg-types iia))
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;; no contravariance here
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(type>= (inline-info-return-type ii)
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(inline-info-return-type iia))
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(not (and (every #'equal
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(inline-info-arg-types ii)
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(inline-info-arg-types iia))
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(equal (inline-info-return-type iia)
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(inline-info-return-type ii)))))
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iia
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ii)
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(or ii iia))
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)
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(defun inline-type-matches (inline-info arg-types return-type
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&aux (rts nil)
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(number-max nil)
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(inline-return-type
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(inline-info-return-type
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inline-info)))
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;; In sysfun.lsp optimizers must be listed with most specific cases last.
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(flet ((float-type-max (t1 t2)
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(cond
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((null t1)
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t2)
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((or (subtypep t1 'DOUBLE-FLOAT)
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(subtypep t2 'DOUBLE-FLOAT))
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'DOUBLE-FLOAT)
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((or (subtypep t1 'SINGLE-FLOAT)
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(subtypep t2 'SINGLE-FLOAT))
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'SINGLE-FLOAT)
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#+short-float
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((or (subtypep t1 'SHORT-FLOAT)
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(subtypep t2 'SHORT-FLOAT))
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'SHORT-FLOAT)
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#+long-float
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((or (subtypep t1 'LONG-FLOAT)
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(subtypep t2 'LONG-FLOAT))
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'LONG-FLOAT)
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(t
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'FIXNUM))))
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(if (and (do ((arg-types arg-types (cdr arg-types))
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(types (inline-info-arg-types inline-info) (cdr types))
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(arg-type)
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(type))
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((or (endp arg-types) (endp types))
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(and (endp arg-types) (endp types)))
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(setq arg-type (car arg-types)
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type (car types))
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(cond ((eq type 'FIXNUM-FLOAT)
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(cond ((type>= 'FIXNUM arg-type)
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(push 'FIXNUM rts))
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((type>= 'DOUBLE-FLOAT arg-type)
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(push 'DOUBLE-FLOAT rts))
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((type>= 'SINGLE-FLOAT arg-type)
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(push 'SINGLE-FLOAT rts))
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#+short-float
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((type>= 'SHORT-FLOAT arg-type)
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(push 'SHORT-FLOAT rts))
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#+long-float
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((type>= 'LONG-FLOAT arg-type)
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(push 'LONG-FLOAT rts))
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(t (return nil)))
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;; compute max of FIXNUM-FLOAT arguments types
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(setq number-max
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(float-type-max number-max (first rts))))
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((type>= (rep-type->lisp-type type) arg-type)
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(push type rts))
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(t (return nil))))
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(or (eq (inline-info-return-rep-type inline-info) :bool)
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(if number-max
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;; for arithmetic operators we take the maximal type
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;; as possible result type
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(and (type>= return-type number-max)
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(type>= number-max inline-return-type))
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;; no contravariance
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(type>= inline-return-type return-type))))
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(let ((inline-info (copy-structure inline-info)))
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(setf (inline-info-arg-types inline-info)
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(nreverse rts))
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inline-info)
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nil))
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)
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(defun need-to-protect (forms &aux ii)
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(do ((forms forms (cdr forms))
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(res nil))
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((or res (endp forms)) res)
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(let ((form (car forms)))
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(declare (object form))
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(case (c1form-name form)
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(LOCATION)
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(VAR
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(when (var-changed-in-form-list (c1form-arg 0 form) (cdr forms))
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(setq res t)))
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(CALL-GLOBAL
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(let ((fname (c1form-arg 0 form))
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(args (c1form-arg 1 form)))
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(or (function-may-have-side-effects fname)
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(need-to-protect args))))
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(SYS:STRUCTURE-REF
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(when (need-to-protect (list (c1form-arg 0 form)))
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(setq res t)))
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(t (setq res t)))))
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)
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(defun close-inline-blocks ()
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(dotimes (i *inline-blocks*) (declare (fixnum i)) (wt #\})))
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(defun form-causes-side-effect (form)
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(case (c1form-name form)
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((LOCATION VAR SYS:STRUCTURE-REF #+clos SYS:INSTANCE-REF)
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nil)
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(CALL-GLOBAL
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(let ((fname (c1form-arg 0 form))
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(args (c1form-arg 1 form)))
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(or (function-may-have-side-effects fname)
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(args-cause-side-effect args))))
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(t t)))
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(defun args-cause-side-effect (forms)
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(some #'form-causes-side-effect forms))
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(defun function-may-have-side-effects (fname)
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(declare (si::c-local))
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(not (get-sysprop fname 'no-side-effects)))
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(defun function-may-change-sp (fname)
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(not (or (get-sysprop fname 'no-side-effects)
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(get-sysprop fname 'no-sp-change))))
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