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authordos-reis <gdr@axiomatics.org>2007-08-14 05:14:52 +0000
committerdos-reis <gdr@axiomatics.org>2007-08-14 05:14:52 +0000
commitab8cc85adde879fb963c94d15675783f2cf4b183 (patch)
treec202482327f474583b750b2c45dedfc4e4312b1d /src/interp/bits.lisp.pamphlet
downloadopen-axiom-ab8cc85adde879fb963c94d15675783f2cf4b183.tar.gz
Initial population.
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+%% Oh Emacs, this is a -*- Lisp -*- file despite apperance.
+\documentclass{article}
+\usepackage{axiom}
+
+\title{\File{src/interp/bits.lisp} Pamphlet}
+\author{Timothy Daly}
+
+\begin{document}
+
+\maketitle
+\begin{abstract}
+\end{abstract}
+
+\tableofcontents
+\eject
+
+\section{License}
+
+<<license>>=
+;; Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+;; All rights reserved.
+;;
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are
+;; met:
+;;
+;; - Redistributions of source code must retain the above copyright
+;; notice, this list of conditions and the following disclaimer.
+;;
+;; - Redistributions in binary form must reproduce the above copyright
+;; notice, this list of conditions and the following disclaimer in
+;; the documentation and/or other materials provided with the
+;; distribution.
+;;
+;; - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+;; names of its contributors may be used to endorse or promote products
+;; derived from this software without specific prior written permission.
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+;; IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+;; TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+;; PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+;; OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+@
+<<*>>=
+<<license>>
+
+;;; The types "bit" and "bit vector" are implemented differently
+;;; in different variants of lisp.
+;;; These lisp macros/functions will have different implementations
+;;; on different lisp systems.
+
+;;; The operations which traverse entire vectors are given as functions
+;;; since the function calling overhead will be relatively small.
+;;; The operations which extract or set a single part of the vector are
+;;; provided as macros.
+
+(in-package "BOOT")
+
+;;; SMW Nov 88: Created
+
+(defmacro truth-to-bit (x) `(cond (,x 1) ('else 0)))
+(defmacro bit-to-truth (b) `(eq ,b 1))
+
+(defun bvec-make-full (n x)
+ (make-array (list n) :element-type 'bit :initial-element x))
+
+(defmacro bvec-elt (bv i) `(sbit ,bv ,i))
+(defmacro bvec-setelt (bv i x) `(setf (sbit ,bv ,i) ,x))
+(defmacro bvec-size (bv) `(size ,bv))
+
+(defun bvec-copy (bv) (copy-seq bv))
+(defun bvec-concat (bv1 bv2) (concatenate '(vector bit) bv1 bv2))
+(defun bvec-equal (bv1 bv2) (equal bv1 bv2))
+(defun bvec-greater (bv1 bv2)
+ (let ((pos (mismatch bv1 bv2)))
+ (cond ((or (null pos) (>= pos (length bv1))) nil)
+ ((< pos (length bv2)) (> (bit bv1 pos) (bit bv2 pos)))
+ ((find 1 bv1 :start pos) t)
+ (t nil))))
+(defun bvec-and (bv1 bv2) (bit-and bv1 bv2))
+(defun bvec-or (bv1 bv2) (bit-ior bv1 bv2))
+(defun bvec-xor (bv1 bv2) (bit-xor bv1 bv2))
+(defun bvec-nand (bv1 bv2) (bit-nand bv1 bv2))
+(defun bvec-nor (bv1 bv2) (bit-nor bv1 bv2))
+(defun bvec-not (bv) (bit-not bv))
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}