/[jscoverage]/trunk/js/src/fdlibm/e_scalb.c
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Annotation of /trunk/js/src/fdlibm/e_scalb.c

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Wed Aug 1 13:51:53 2007 UTC (14 years, 11 months ago) by siliconforks
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Initial import.

1 siliconforks 2 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2     *
3     * ***** BEGIN LICENSE BLOCK *****
4     * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5     *
6     * The contents of this file are subject to the Mozilla Public License Version
7     * 1.1 (the "License"); you may not use this file except in compliance with
8     * the License. You may obtain a copy of the License at
9     * http://www.mozilla.org/MPL/
10     *
11     * Software distributed under the License is distributed on an "AS IS" basis,
12     * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13     * for the specific language governing rights and limitations under the
14     * License.
15     *
16     * The Original Code is Mozilla Communicator client code, released
17     * March 31, 1998.
18     *
19     * The Initial Developer of the Original Code is
20     * Sun Microsystems, Inc.
21     * Portions created by the Initial Developer are Copyright (C) 1998
22     * the Initial Developer. All Rights Reserved.
23     *
24     * Contributor(s):
25     *
26     * Alternatively, the contents of this file may be used under the terms of
27     * either of the GNU General Public License Version 2 or later (the "GPL"),
28     * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29     * in which case the provisions of the GPL or the LGPL are applicable instead
30     * of those above. If you wish to allow use of your version of this file only
31     * under the terms of either the GPL or the LGPL, and not to allow others to
32     * use your version of this file under the terms of the MPL, indicate your
33     * decision by deleting the provisions above and replace them with the notice
34     * and other provisions required by the GPL or the LGPL. If you do not delete
35     * the provisions above, a recipient may use your version of this file under
36     * the terms of any one of the MPL, the GPL or the LGPL.
37     *
38     * ***** END LICENSE BLOCK ***** */
39    
40     /* @(#)e_scalb.c 1.3 95/01/18 */
41     /*
42     * ====================================================
43     * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
44     *
45     * Developed at SunSoft, a Sun Microsystems, Inc. business.
46     * Permission to use, copy, modify, and distribute this
47     * software is freely granted, provided that this notice
48     * is preserved.
49     * ====================================================
50     */
51    
52     /*
53     * __ieee754_scalb(x, fn) is provide for
54     * passing various standard test suite. One
55     * should use scalbn() instead.
56     */
57    
58     #include "fdlibm.h"
59    
60     #ifdef _SCALB_INT
61     #ifdef __STDC__
62     double __ieee754_scalb(double x, int fn)
63     #else
64     double __ieee754_scalb(x,fn)
65     double x; int fn;
66     #endif
67     #else
68     #ifdef __STDC__
69     double __ieee754_scalb(double x, double fn)
70     #else
71     double __ieee754_scalb(x,fn)
72     double x, fn;
73     #endif
74     #endif
75     {
76     #ifdef _SCALB_INT
77     return fd_scalbn(x,fn);
78     #else
79     if (fd_isnan(x)||fd_isnan(fn)) return x*fn;
80     if (!fd_finite(fn)) {
81     if(fn>0.0) return x*fn;
82     else return x/(-fn);
83     }
84     if (fd_rint(fn)!=fn) return (fn-fn)/(fn-fn);
85     if ( fn > 65000.0) return fd_scalbn(x, 65000);
86     if (-fn > 65000.0) return fd_scalbn(x,-65000);
87     return fd_scalbn(x,(int)fn);
88     #endif
89     }

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