;;; bignum-ashift-right bignum-ashift-left bignum-gcd
;;; bignum-to-float bignum-integer-length
;;; bignum-logical-and bignum-logical-ior bignum-logical-xor
-;;; bignum-logical-not bignum-load-byte bignum-deposit-byte
+;;; bignum-logical-not bignum-load-byte
;;; bignum-truncate bignum-plus-p bignum-compare make-small-bignum
;;; bignum-logbitp bignum-logcount
;;; These symbols define the interface to the compiler:
;;; %bignum-length %bignum-set-length %bignum-ref %bignum-set
;;; %digit-0-or-plusp %add-with-carry %subtract-with-borrow
;;; %multiply-and-add %multiply %lognot %logand %logior %logxor
-;;; %fixnum-to-digit %floor %fixnum-digit-with-correct-sign %ashl
+;;; %fixnum-to-digit %bigfloor %fixnum-digit-with-correct-sign %ashl
;;; %ashr %digit-logical-shift-right))
;;; The following interfaces will either be assembler routines or code
;;; LDB
;;; %FIXNUM-TO-DIGIT
;;; TRUNCATE
-;;; %FLOOR
+;;; %BIGFLOOR
;;;
;;; Note: The floating routines know about the float representation.
;;;
;;; dividing the first two as a 2*digit-size integer by the third.
;;;
;;; Do weird LET and SETQ stuff to bamboozle the compiler into allowing
-;;; the %FLOOR transform to expand into pseudo-assembler for which the
+;;; the %BIGFLOOR transform to expand into pseudo-assembler for which the
;;; compiler can later correctly allocate registers.
-(defun %floor (a b c)
+(defun %bigfloor (a b c)
(let ((a a) (b b) (c c))
(declare (type bignum-element-type a b c))
(setq a a b b c c)
- (%floor a b c)))
+ (%bigfloor a b c)))
;;; Convert the digit to a regular integer assuming that the digit is signed.
(defun %fixnum-digit-with-correct-sign (digit)
(setf u-len (make-gcd-bignum-odd u u-len))
(rotatef u v)
(rotatef u-len v-len))
+ (bignum-abs-buffer u u-len)
(setf u (copy-bignum u u-len))
(let ((n (bignum-mod-gcd v1 u)))
(ash (bignum-mod-gcd u1 (if (fixnump n)
;;; normalization.
;;;
;;; We don't have to worry about shifting Y to make its most
- ;;; significant digit sufficiently large for %FLOOR to return
+ ;;; significant digit sufficiently large for %BIGFLOOR to return
;;; digit-size quantities for the q-digit and r-digit. If Y is
;;; a single digit bignum, it is already large enough for
- ;;; %FLOOR. That is, it has some bits on pretty high in the
+ ;;; %BIGFLOOR. That is, it has some bits on pretty high in the
;;; digit.
((bignum-truncate-single-digit (x len-x y)
(declare (type bignum-index len-x))
(values q rem)))
(declare (type bignum-element-type r))
(multiple-value-bind (q-digit r-digit)
- (%floor r (%bignum-ref x i) y)
+ (%bigfloor r (%bignum-ref x i) y)
(declare (type bignum-element-type q-digit r-digit))
(setf (%bignum-ref q i) q-digit)
(setf r r-digit))))))
(declare (type bignum-element-type y1 y2 x-i x-i-1 x-i-2))
(let ((guess (if (%digit-compare x-i y1)
all-ones-digit
- (%floor x-i x-i-1 y1))))
+ (%bigfloor x-i x-i-1 y1))))
(declare (type bignum-element-type guess))
(loop
(multiple-value-bind (high-guess*y1 low-guess*y1)
;;; digit-size.
;;;
;;; We shift y to make it sufficiently large that doing the
- ;;; 2*digit-size by digit-size %FLOOR calls ensures the quotient and
+ ;;; 2*digit-size by digit-size %BIGFLOOR calls ensures the quotient and
;;; remainder fit in digit-size.
(shift-y-for-truncate (y)
(let* ((len (%bignum-length y))
;;;; There used to be a pile of code for implementing division for bignum digits
;;;; for machines that don't have a 2*digit-size by digit-size divide instruction.
;;;; This happens to be most machines, but all the SBCL ports seem to be content
-;;;; to implement SB-BIGNUM:%FLOOR as a VOP rather than using the code here.
+;;;; to implement SB-BIGNUM:%BIGFLOOR as a VOP rather than using the code here.
;;;; So it's been deleted. --njf, 2007-02-04
\f
;;;; general utilities
projects / sbcl.git / blobdiff