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65 lines
2.3 KiB
Plaintext
65 lines
2.3 KiB
Plaintext
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#!/usr/linguist/bin/perl
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#
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# make-logtab
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#
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# Generate a table of logarithms of 2 in various bases, for use in
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# estimating the output sizes of various bases.
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# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is the MPI Arbitrary Precision Integer Arithmetic
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# library.
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#
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# The Initial Developer of the Original Code is
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# Michael J. Fromberger <sting@linguist.dartmouth.edu>
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# Portions created by the Initial Developer are Copyright (C) 1998, 2000
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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# $Id: make-logtab,v 1.4 2005/02/02 22:28:22 gerv%gerv.net Exp $
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$ARRAYNAME = $ENV{'ARRAYNAME'} || "s_logv_2";
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$ARRAYTYPE = $ENV{'ARRAYTYPE'} || "float";
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printf("const %s %s[] = {\n %0.9ff, %0.9ff, ",
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$ARRAYTYPE, $ARRAYNAME, 0, 0);
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$brk = 2;
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for($ix = 2; $ix < 64; $ix++) {
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printf("%0.9ff, ", (log(2)/log($ix)));
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$brk = ($brk + 1) & 3;
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if(!$brk) {
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printf(" /* %2d %2d %2d %2d */\n ",
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$ix - 3, $ix - 2, $ix - 1, $ix);
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}
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}
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printf("%0.9ff\n};\n\n", (log(2)/log($ix)));
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exit 0;
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