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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jslibmath_h
#define jslibmath_h
#include "mozilla/FloatingPoint.h"
#include <math.h>
#include "js/Value.h"
#include "vm/JSContext.h"
namespace js {
inline double NumberDiv(double a, double b) {
AutoUnsafeCallWithABI unsafe(UnsafeABIStrictness::AllowPendingExceptions);
if (b == 0) {
if (a == 0 || mozilla::IsNaN(a)) {
return JS::GenericNaN();
}
if (mozilla::IsNegative(a) != mozilla::IsNegative(b)) {
return mozilla::NegativeInfinity<double>();
}
return mozilla::PositiveInfinity<double>();
}
return a / b;
}
inline double NumberMod(double a, double b) {
AutoUnsafeCallWithABI unsafe(UnsafeABIStrictness::AllowPendingExceptions);
if (b == 0) {
return JS::GenericNaN();
}
double r = fmod(a, b);
#if defined(XP_WIN)
// Some versions of Windows (Win 10 v1803, v1809) miscompute the sign of zero
// results from fmod. The sign should match the sign of the LHS. This bug
// only affects 64-bit builds. See bug 1527007.
if (mozilla::IsPositiveZero(r) && mozilla::IsNegative(a)) {
return -0.0;
}
#endif
return r;
}
} // namespace js
#endif /* jslibmath_h */