make-logtab
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:2k
- #!/usr/linguist/bin/perl
- #
- # make-logtab
- #
- # Generate a table of logarithms of 2 in various bases, for use in
- # estimating the output sizes of various bases.
- #
- ## The contents of this file are subject to the Mozilla Public
- ## License Version 1.1 (the "License"); you may not use this file
- ## except in compliance with the License. You may obtain a copy of
- ## the License at http://www.mozilla.org/MPL/
- ##
- ## Software distributed under the License is distributed on an "AS
- ## IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- ## implied. See the License for the specific language governing
- ## rights and limitations under the License.
- ##
- ## The Original Code is the MPI Arbitrary Precision Integer Arithmetic
- ## library.
- ##
- ## The Initial Developer of the Original Code is
- ## Michael J. Fromberger <sting@linguist.dartmouth.edu>
- ##
- ## Portions created by Michael J. Fromberger are
- ## Copyright (C) 1998, 2000 Michael J. Fromberger. All Rights Reserved
- ##
- ## Contributor(s):
- ##
- ## Alternatively, the contents of this file may be used under the
- ## terms of the GNU General Public License Version 2 or later (the
- ## "GPL"), in which case the provisions of the GPL are applicable
- ## instead of those above. If you wish to allow use of your
- ## version of this file only under the terms of the GPL and not to
- ## allow others to use your version of this file under the MPL,
- ## indicate your decision by deleting the provisions above and
- ## replace them with the notice and other provisions required by
- ## the GPL. If you do not delete the provisions above, a recipient
- ## may use your version of this file under either the MPL or the
- ## GPL.
- #
- # $Id: make-logtab,v 1.3 2000/08/09 22:45:51 nelsonb%netscape.com Exp $
- $ARRAYNAME = $ENV{'ARRAYNAME'} || "s_logv_2";
- $ARRAYTYPE = $ENV{'ARRAYTYPE'} || "float";
- printf("const %s %s[] = {n %0.9ff, %0.9ff, ",
- $ARRAYTYPE, $ARRAYNAME, 0, 0);
- $brk = 2;
- for($ix = 2; $ix < 64; $ix++) {
- printf("%0.9ff, ", (log(2)/log($ix)));
- $brk = ($brk + 1) & 3;
- if(!$brk) {
- printf(" /* %2d %2d %2d %2d */n ",
- $ix - 3, $ix - 2, $ix - 1, $ix);
- }
- }
- printf("%0.9ffn};nn", (log(2)/log($ix)));
- exit 0;