1 : /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: set ts=4 sw=4 et tw=79:
3 : *
4 : * ***** BEGIN LICENSE BLOCK *****
5 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 : *
7 : * The contents of this file are subject to the Mozilla Public License Version
8 : * 1.1 (the "License"); you may not use this file except in compliance with
9 : * the License. You may obtain a copy of the License at
10 : * http://www.mozilla.org/MPL/
11 : *
12 : * Software distributed under the License is distributed on an "AS IS" basis,
13 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 : * for the specific language governing rights and limitations under the
15 : * License.
16 : *
17 : * The Original Code is Mozilla Communicator client code, released
18 : * March 31, 1998.
19 : *
20 : * The Initial Developer of the Original Code is
21 : * Netscape Communications Corporation.
22 : * Portions created by the Initial Developer are Copyright (C) 1998
23 : * the Initial Developer. All Rights Reserved.
24 : *
25 : * Contributor(s):
26 : * IBM Corp.
27 : *
28 : * Alternatively, the contents of this file may be used under the terms of
29 : * either of the GNU General Public License Version 2 or later (the "GPL"),
30 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
31 : * in which case the provisions of the GPL or the LGPL are applicable instead
32 : * of those above. If you wish to allow use of your version of this file only
33 : * under the terms of either the GPL or the LGPL, and not to allow others to
34 : * use your version of this file under the terms of the MPL, indicate your
35 : * decision by deleting the provisions above and replace them with the notice
36 : * and other provisions required by the GPL or the LGPL. If you do not delete
37 : * the provisions above, a recipient may use your version of this file under
38 : * the terms of any one of the MPL, the GPL or the LGPL.
39 : *
40 : * ***** END LICENSE BLOCK ***** */
41 :
42 : #ifndef _LIBMATH_H
43 : #define _LIBMATH_H
44 :
45 : #include <math.h>
46 : #include "jsnum.h"
47 :
48 : /*
49 : * Use system provided math routines.
50 : */
51 :
52 : /* The right copysign function is not always named the same thing. */
53 : #if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
54 : #define js_copysign __builtin_copysign
55 : #elif defined _WIN32
56 : #if _MSC_VER < 1400
57 : /* Try to work around apparent _copysign bustage in VC7.x. */
58 : #define js_copysign js_copysign
59 : extern double js_copysign(double, double);
60 : #else
61 : #define js_copysign _copysign
62 : #endif
63 : #else
64 : #define js_copysign copysign
65 : #endif
66 :
67 : #if defined(_M_X64) && defined(_MSC_VER) && _MSC_VER <= 1500
68 : // This is a workaround for fmod bug (http://support.microsoft.com/kb/982107)
69 : extern "C" double js_myfmod(double x, double y);
70 : #define fmod js_myfmod
71 : #endif
72 :
73 : /* Consistency wrapper for platform deviations in fmod() */
74 : static inline double
75 40576 : js_fmod(double d, double d2)
76 : {
77 : #ifdef XP_WIN
78 : /*
79 : * Workaround MS fmod bug where 42 % (1/0) => NaN, not 42.
80 : * Workaround MS fmod bug where -0 % -N => 0, not -0.
81 : */
82 : if ((JSDOUBLE_IS_FINITE(d) && JSDOUBLE_IS_INFINITE(d2)) ||
83 : (d == 0 && JSDOUBLE_IS_FINITE(d2))) {
84 : return d;
85 : }
86 : #endif
87 40576 : return fmod(d, d2);
88 : }
89 :
90 : namespace js {
91 :
92 : inline double
93 1396642 : NumberDiv(double a, double b) {
94 1396642 : if (b == 0) {
95 1395 : if (a == 0 || JSDOUBLE_IS_NaN(a)
96 : #ifdef XP_WIN
97 : || JSDOUBLE_IS_NaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */
98 : #endif
99 : )
100 17 : return js_NaN;
101 :
102 1378 : if (JSDOUBLE_IS_NEG(a) != JSDOUBLE_IS_NEG(b))
103 491 : return js_NegativeInfinity;
104 887 : return js_PositiveInfinity;
105 : }
106 :
107 1395247 : return a / b;
108 : }
109 :
110 : }
111 :
112 : #endif /* _LIBMATH_H */
113 :
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