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77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jslibmath_h
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#define jslibmath_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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#ifdef __GNUC__
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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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/* 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 ((mozilla::IsFinite(d) && mozilla::IsInfinite(d2)) ||
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(d == 0 && mozilla::IsFinite(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 || mozilla::IsNaN(a)
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#ifdef XP_WIN
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|| mozilla::IsNaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */
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#endif
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)
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return JS::GenericNaN();
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if (mozilla::IsNegative(a) != mozilla::IsNegative(b))
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return mozilla::NegativeInfinity<double>();
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return mozilla::PositiveInfinity<double>();
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}
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return a / b;
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}
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inline double
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NumberMod(double a, double b) {
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if (b == 0)
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return JS::GenericNaN();
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return js_fmod(a, b);
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}
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}
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#endif /* jslibmath_h */
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