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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=79:
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*
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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 Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* IBM Corp.
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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#ifndef _LIBMATH_H
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#define _LIBMATH_H
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#include "mozilla/FloatingPoint.h"
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#include <math.h>
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#include "jsnum.h"
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/*
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* Use system provided math routines.
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*/
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/* The right copysign function is not always named the same thing. */
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#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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#define js_copysign __builtin_copysign
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#elif defined _WIN32
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#define js_copysign _copysign
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#else
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#define js_copysign copysign
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#endif
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#if defined(_M_X64) && defined(_MSC_VER) && _MSC_VER <= 1500
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// This is a workaround for fmod bug (http://support.microsoft.com/kb/982107)
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extern "C" double js_myfmod(double x, double y);
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#define fmod js_myfmod
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#endif
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/* Consistency wrapper for platform deviations in fmod() */
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static inline double
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js_fmod(double d, double d2)
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{
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#ifdef XP_WIN
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/*
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* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42.
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* Workaround MS fmod bug where -0 % -N => 0, not -0.
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*/
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if ((MOZ_DOUBLE_IS_FINITE(d) && MOZ_DOUBLE_IS_INFINITE(d2)) ||
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(d == 0 && MOZ_DOUBLE_IS_FINITE(d2))) {
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return d;
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}
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#endif
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return fmod(d, d2);
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}
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namespace js {
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inline double
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NumberDiv(double a, double b)
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{
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if (b == 0) {
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if (a == 0 || MOZ_DOUBLE_IS_NaN(a)
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#ifdef XP_WIN
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|| MOZ_DOUBLE_IS_NaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */
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#endif
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)
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return js_NaN;
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if (MOZ_DOUBLE_IS_NEGATIVE(a) != MOZ_DOUBLE_IS_NEGATIVE(b))
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return js_NegativeInfinity;
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return js_PositiveInfinity;
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}
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return a / b;
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}
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}
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#endif /* _LIBMATH_H */
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