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(calc-word-size): Reset the variables math-2-word-size' and math-half-2-word-size'.

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(math-format-complement-signed, math-symclip, calcFunc-symclip, calc-symclip): New functions.
This commit is contained in:
Jay Belanger 2009-11-16 00:00:22 +00:00
parent 55c222f6ed
commit b1d9611c47
1 changed files with 71 additions and 6 deletions
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77
lisp/calc/calc-bin.el
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@ -154,6 +154,10 @@ the size of a Calc bignum digit.")
(calc-change-mode '(calc-word-size calc-previous-modulo)
(list n (math-power-of-2 (math-abs n)))
calc-leading-zeros)))
(setq math-2-word-size (math-power-of-2 (math-abs n)))
(setq math-half-2-word-size (math-power-of-2 (1- (math-abs n))))
(calc-do-refresh)
(calc-refresh-evaltos)
(if (< n 0)
(message "Binary word size is %d bits (2's complement)" (- n))
(message "Binary word size is %d bits" n))))
@ -164,24 +168,28 @@ the size of a Calc bignum digit.")
;;; d-prefix mode commands.
(defun calc-radix (n)
(defun calc-radix (n &optional arg)
(interactive "NDisplay radix (2-36): ")
(calc-wrapper
(if (and (>= n 2) (<= n 36))
(progn
(calc-change-mode 'calc-number-radix n t)
(calc-change-mode
(list 'calc-number-radix 'calc-complement-signed-mode)
(list n (and (= n 2) arg)) t)
;; also change global value so minibuffer sees it
(setq-default calc-number-radix calc-number-radix))
(setq n calc-number-radix))
(message "Number radix is %d" n)))
(if calc-complement-signed-mode
(message "Number radix is %d, complement signed mode is on." n)
(message "Number radix is %d" n))))
(defun calc-decimal-radix ()
(interactive)
(calc-radix 10))
(defun calc-binary-radix ()
(interactive)
(calc-radix 2))
(defun calc-binary-radix (&optional arg)
(interactive "P")
(calc-radix 2 arg))
(defun calc-octal-radix ()
(interactive)
@ -812,6 +820,63 @@ the size of a Calc bignum digit.")
calc-number-radix))))))
math-radix-float-cache))))))))
;;; Complement signed mode
(defun math-format-complement-signed (a)
"Format an integer in complement signed mode."
(let* (;(calc-leading-zeros t)
(overflow nil)
(negative nil)
(num
(cond
((or (eq a 0)
(and (Math-integer-posp a)))
(if (integerp a)
(math-format-radix a)
(math-format-bignum-radix (cdr a))))
((Math-integer-negp a)
(let ((newa (math-add a math-2-word-size)))
(if (integerp newa)
(math-format-radix newa)
(math-format-bignum-radix (cdr newa))))))))
(let* ((calc-internal-prec 6)
(digs (math-compute-max-digits (math-abs calc-word-size)
calc-number-radix))
(len (length num)))
(if (< len digs)
(setq num (concat (make-string (- digs len) ?0) num))))
(concat
(number-to-string calc-number-radix)
"##"
num)))
(defun math-symclip (a)
"Reduce A to between -2^(w-1) and 2^(w-1)-1."
(if (not (Math-num-integerp a))
(math-reject-arg a 'integerp)
(if (and (Math-lessp a math-half-2-word-size)
(let
((comparison (math-compare (Math-integer-neg a) math-half-2-word-size)))
(or (= comparison 0)
(= comparison -1))))
a
(let ((smalla (math-clip a)))
(if (Math-lessp smalla math-half-2-word-size)
smalla
(math-sub smalla math-2-word-size))))))
(defalias 'calcFunc-symclip 'math-symclip)
(defun calc-symclip (n)
"Reduce N to between -2^(w-1) and 2^(w-1)-1."
(interactive "P")
(calc-slow-wrapper
(calc-enter-result 1 "sclp"
(append '(calcFunc-symclip)
(calc-top-list-n 1)
(and n (list (prefix-numeric-value n)))))))
(provide 'calc-bin)
;; arch-tag: f6dba7bc-53b2-41ae-919c-c266ab0ca8b3