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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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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 "js/Value.h"
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#include "vm/JSContext.h"
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namespace js {
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inline double NumberDiv(double a, double b) {
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AutoUnsafeCallWithABI unsafe(UnsafeABIStrictness::AllowPendingExceptions);
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if (b == 0) {
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if (a == 0 || mozilla::IsNaN(a)) {
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return JS::GenericNaN();
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}
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if (mozilla::IsNegative(a) != mozilla::IsNegative(b)) {
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return mozilla::NegativeInfinity<double>();
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}
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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 NumberMod(double a, double b) {
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AutoUnsafeCallWithABI unsafe(UnsafeABIStrictness::AllowPendingExceptions);
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if (b == 0) {
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return JS::GenericNaN();
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}
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double r = fmod(a, b);
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#if defined(XP_WIN)
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// Some versions of Windows (Win 10 v1803, v1809) miscompute the sign of zero
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// results from fmod. The sign should match the sign of the LHS. This bug
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// only affects 64-bit builds. See bug 1527007.
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if (mozilla::IsPositiveZero(r) && mozilla::IsNegative(a)) {
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return -0.0;
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}
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#endif
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return r;
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}
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} // namespace js
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#endif /* jslibmath_h */