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|
;;;; 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")
(defun constraint-propagate-back (lvar kind constraint gen consequent alternative)
(multiple-value-bind (node nth-value) (mv-principal-lvar-ref-use lvar)
(when (combination-p node)
(binding* ((info (combination-fun-info node) :exit-if-null)
(propagate (fun-info-constraint-propagate-back info)
:exit-if-null))
(funcall propagate node nth-value kind constraint gen consequent alternative)))))
(defun numeric-contagion-constraint-back (x y gen constraint consequent &optional complex-p
(x-type (lvar-type x))
(y-type (lvar-type y)))
(flet ((add (lvar type)
(let ((var (and lvar
(ok-lvar-lambda-var lvar gen))))
(when var
(conset-add-constraint-to-eql gen 'typep var type nil consequent)))))
(let ((real-type (if complex-p ;; complex rationals multiplied by 0 will produce an integer 0.
(specifier-type '(and real (not (eql 0))))
(specifier-type 'real))))
(cond ((csubtypep constraint (specifier-type 'rational))
(cond ((or (csubtypep x-type real-type)
(csubtypep y-type real-type))
(add x (specifier-type 'rational))
(add y (specifier-type 'rational)))
(t
(add x (specifier-type '(or rational (complex rational))))
(add y (specifier-type '(or rational (complex rational)))))))
((and (csubtypep constraint (specifier-type 'double-float))
(cond ((not x)
(add y (specifier-type 'double-float))
t)
(t
(let ((x-double (types-equal-or-intersect x-type (specifier-type 'double-float)))
(y-double (types-equal-or-intersect y-type (specifier-type 'double-float))))
(or (when (and x-double
(not y-double)
(not (csubtypep x-type (specifier-type 'double-float))))
(add x (specifier-type 'double-float))
t)
(when (and y-double
(not x-double)
(not (csubtypep y-type (specifier-type 'double-float))))
(add x (specifier-type 'double-float))
t)))))))
((and (csubtypep constraint (specifier-type 'single-float))
(cond ((not x)
(add y (specifier-type 'single-float))
t)
(t
(let ((x-double (types-equal-or-intersect x-type (specifier-type 'double-float)))
(y-double (types-equal-or-intersect y-type (specifier-type 'double-float))))
(when x-double
(add x (specifier-type '(not double-float))))
(when y-double
(add y (specifier-type '(not double-float))))
nil)))))
((and (not x)
(csubtypep constraint (specifier-type 'float)))
(add y (specifier-type 'float)))
((and (not x)
(csubtypep constraint (specifier-type 'complex)))
(add y (specifier-type 'complex)))
((csubtypep constraint (specifier-type 'real))
(let ((x-realp (csubtypep x-type (specifier-type 'real)))
(y-realp (csubtypep y-type (specifier-type 'real))))
(cond ((and x-realp
(not y-realp))
(add y (specifier-type 'real)))
((and y-realp
(not x-realp))
(add x (specifier-type 'real))))))))))
(defoptimizer (+ constraint-propagate-back) ((x y) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(case kind
(typep
;; (integerp (+ integer y)) means Y is an integer too.
;; (integerp (+ y-real x-real)) means X and Y are rational.
(flet ((add (lvar type)
(let ((var (ok-lvar-lambda-var lvar gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var type nil consequent)))))
(cond ((and (csubtypep constraint (specifier-type 'integer))
(let ((x-integerp (csubtypep (lvar-type x) (specifier-type 'integer)))
(y-integerp (csubtypep (lvar-type y) (specifier-type 'integer))))
(flet ((int (c-interval x y)
(let* ((y-interval (type-approximate-interval (lvar-type y) t))
(int (and c-interval y-interval
(interval-sub c-interval y-interval))))
(add x (specifier-type (if int
`(integer ,(or (interval-low int) '*)
,(or (interval-high int) '*))
'integer))))))
(when (or y-integerp x-integerp)
(let ((interval (type-approximate-interval constraint t)))
(int interval y x)
(int interval x y))
t)))))
(t
(numeric-contagion-constraint-back x y gen constraint consequent)))))))
(defun -constraint-propagate-back (x y x-type y-type kind constraint gen consequent)
(case kind
(typep
(flet ((add (lvar type)
(let ((var (and lvar
(ok-lvar-lambda-var lvar gen))))
(when var
(conset-add-constraint-to-eql gen 'typep var type nil consequent)))))
(cond ((and (csubtypep constraint (specifier-type 'integer))
(let ((x-integerp (csubtypep x-type (specifier-type 'integer)))
(y-integerp (csubtypep y-type (specifier-type 'integer))))
(when (or y-integerp x-integerp)
(let ((c-interval (type-approximate-interval constraint t)))
(let* ((y-interval (type-approximate-interval (lvar-type y) t))
(int (and c-interval
y-interval
(interval-add c-interval y-interval))))
(add x (specifier-type (if int
`(integer ,(or (interval-low int) '*)
,(or (interval-high int) '*))
'integer))))
(let* ((x-interval (type-approximate-interval x-type t))
(int (and c-interval
x-interval
(interval-sub x-interval c-interval))))
(add y (specifier-type (if int
`(integer ,(or (interval-low int) '*)
,(or (interval-high int) '*))
'integer)))))
t))))
(t
(numeric-contagion-constraint-back x y gen constraint consequent nil x-type y-type)))))))
(defoptimizer (- constraint-propagate-back) ((x y) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(-constraint-propagate-back x y (lvar-type x) (lvar-type y) kind constraint gen consequent))
(defoptimizer (* constraint-propagate-back) ((x y) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(case kind
(typep
(flet ((add (lvar type)
(let ((var (ok-lvar-lambda-var lvar gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var type nil consequent)))))
(let ((complex-p (or (types-equal-or-intersect (lvar-type x) (specifier-type 'complex))
(types-equal-or-intersect (lvar-type y) (specifier-type 'complex)))))
(cond ((and
(csubtypep constraint (specifier-type 'integer))
(let* ((rational-type (if complex-p
(specifier-type '(and rational (not (eql 0))))
(specifier-type 'rational)))
(x-rationalp (csubtypep (lvar-type x) rational-type))
(y-rationalp (csubtypep (lvar-type y) rational-type)))
(flet ((int (c-interval x y)
(let* ((y-interval (type-approximate-interval (lvar-type y) t))
(int (and c-interval
y-interval
(interval-div c-interval y-interval))))
(add x (specifier-type (if int
`(rational ,(or (interval-low int) '*)
,(or (interval-high int) '*))
'rational))))))
(when (or y-rationalp x-rationalp)
(let ((interval (type-approximate-interval constraint t))
(x-zerop (types-equal-or-intersect (lvar-type x) (specifier-type '(eql 0))))
(y-zerop (types-equal-or-intersect (lvar-type y) (specifier-type '(eql 0)))))
(cond ((not interval)
nil)
((and (interval-contains-p 0 interval)
(or x-zerop y-zerop))
;; If one is not zero the other must include a zero
(if x-zerop
(add y (specifier-type 'rational))
(int interval y x))
(if y-zerop
(add x (specifier-type 'rational))
(int interval x y))
t)
(t
(int interval y x)
(int interval x y)
t))))))))
(t
(numeric-contagion-constraint-back x y gen constraint consequent complex-p))))))))
(defoptimizer (/ constraint-propagate-back) ((x y) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(case kind
(typep
(numeric-contagion-constraint-back x y gen constraint consequent))))
(defoptimizers constraint-propagate-back (car cdr) ((x) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(case kind
(typep
(unless (types-equal-or-intersect constraint (specifier-type 'null))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not null)) nil consequent)))))))
;;; If the remainder is non-zero then X can't be zero.
(defoptimizer (truncate constraint-propagate-back) ((x y) node nth-value kind constraint gen consequent alternative)
(let ((var (ok-lvar-lambda-var x gen)))
(when (and var
(eql nth-value 1)
(csubtypep (lvar-type x) (specifier-type 'integer))
(csubtypep (lvar-type y) (specifier-type 'integer)))
(case kind
(eql
(when (and (constant-p constraint)
(eql (constant-value constraint) 0)
alternative)
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(and integer (not (eql 0)))) nil alternative)))
(>
(when (csubtypep (lvar-type constraint) (specifier-type '(integer 0)))
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(integer 1)) nil consequent)))))))
(defoptimizer (%negate constraint-propagate-back) ((x) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value alternative))
(case kind
(<
(when (and (csubtypep (lvar-type x) (specifier-type 'rational))
(csubtypep (lvar-type constraint) (specifier-type 'rational)))
(let ((range (type-approximate-interval (lvar-type constraint))))
(when (and range
(numberp (interval-high range)))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var (specifier-type `(rational (,(- (interval-high range)))))
nil consequent)))))))
(typep
(-constraint-propagate-back nil x (specifier-type '(eql 0)) (lvar-type x) kind constraint gen consequent))))
(defoptimizer (char-code constraint-propagate-back) ((x) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value))
(case kind
((< > eq)
(when (csubtypep (lvar-type constraint) (specifier-type 'rational))
(let ((range (type-approximate-interval (lvar-type constraint))))
(when (and range
(numberp (interval-high range)))
(let ((var (ok-lvar-lambda-var x gen))
(low (interval-low range))
(high (interval-high range)))
(when var
(interval-high range)
(case kind
(<
(when (and (numberp high)
(< high (1- char-code-limit)))
(conset-add-constraint-to-eql gen 'typep var
(if (<= high 0)
*empty-type*
(specifier-type `(character-set ((0 . ,(1- high))))))
nil
consequent))
(when (and alternative
(numberp low)
(> low 0))
(conset-add-constraint-to-eql gen 'typep var
(specifier-type `(character-set ((,low . #.(1- char-code-limit)))))
nil
alternative)))
(>
(when (and (numberp low)
(> low 0))
(conset-add-constraint-to-eql gen 'typep var
(if (>= low (1- char-code-limit))
*empty-type*
(specifier-type `(character-set ((,(1+ low) . #.(1- char-code-limit))))))
nil
consequent))
(when (and alternative
(numberp high)
(< high (1- char-code-limit)))
(conset-add-constraint-to-eql gen 'typep var
(specifier-type `(character-set ((0 . ,high))))
nil alternative)))
(eq
(let ((low (if (numberp low)
low
0))
(high (if (numberp high)
high
(1- char-code-limit))))
(when (and (> low 0)
(< high (1- char-code-limit)))
(let ((type (specifier-type `(character-set ((,low . ,high))))))
(conset-add-constraint-to-eql gen 'typep var type nil consequent)
(conset-add-constraint-to-eql gen 'typep var type t alternative))))))))))))))
(defoptimizer (length constraint-propagate-back) ((x) node nth-value kind constraint gen consequent alternative)
(declare (ignore nth-value))
(case kind
(>
(when (csubtypep (lvar-type constraint) (specifier-type '(real 0)))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not null))
nil consequent)
(when (and alternative
(csubtypep (lvar-type constraint) (specifier-type '(real 0 (1)))))
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not cons))
nil alternative))))))
(<
(when (csubtypep (lvar-type constraint) (specifier-type '(real (0))))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(when (csubtypep (lvar-type constraint) (specifier-type '(real 0 1)))
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not cons))
nil consequent))
(when alternative
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not null))
nil alternative))))))
(eq
(cond ((not (types-equal-or-intersect (lvar-type constraint) (specifier-type '(eql 0))))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not null))
nil consequent))))
((eq (lvar-type constraint) (specifier-type '(eql 0)))
(let ((var (ok-lvar-lambda-var x gen)))
(when var
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not cons))
nil consequent)
(when alternative
(conset-add-constraint-to-eql gen 'typep var (specifier-type '(not null))
nil alternative)))))))))
|
