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source: branches/f4grobner/slow-add.lisp@ 4493

Last change on this file since 4493 was 4493, checked in by Marek Rychlik, 8 years ago

* empty log message *
File size: 706 bytes
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1(defun slow-add (p q order-fn add-fn)
2 (cond
3 ((endp p) q)
4 ((endp q) p)
5 (t
6 (multiple-value-bind
7 (greater-p equal-p)
8 (funcall order-fn (car p) (car q))
9 (cond
10 (greater-p ; (> (car p) (car q))
11 (cons (car p) (slow-add (cdr p) q order-fn add-fn))
12 )
13 (equal-p ; (= (car p)) (car q))
14 (let ((s (funcall add-fn (lc p) (lc q))))
15 (cond
16 ((universal-zerop s)
17 (slow-add (cdr p) (cdr q) order-fn add-fn))
18 (t
19 ;; Adjust the lc of p
20 (setf (lc p) s)
21 (cons (car p) (slow-add (cdr p) (cdr q) order-fn add-fn))
22 ))))
23 (t ;(< (car p) (car q))
24 (cons (car q) (slow-add p (cdr q) order-fn add-fn))
25 ))))))
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