| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * 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 "jsnum.h" |
| |
| /* |
| * Use system provided math routines. |
| */ |
| |
| /* The right copysign function is not always named the same thing. */ |
| #ifdef __GNUC__ |
| #define js_copysign __builtin_copysign |
| #elif defined _WIN32 |
| #define js_copysign _copysign |
| #else |
| #define js_copysign copysign |
| #endif |
| |
| /* Consistency wrapper for platform deviations in fmod() */ |
| static inline double |
| js_fmod(double d, double d2) |
| { |
| #ifdef XP_WIN |
| /* |
| * Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. |
| * Workaround MS fmod bug where -0 % -N => 0, not -0. |
| */ |
| if ((mozilla::IsFinite(d) && mozilla::IsInfinite(d2)) || |
| (d == 0 && mozilla::IsFinite(d2))) { |
| return d; |
| } |
| #endif |
| return fmod(d, d2); |
| } |
| |
| namespace js { |
| |
| inline double |
| NumberDiv(double a, double b) |
| { |
| if (b == 0) { |
| if (a == 0 || mozilla::IsNaN(a) |
| #ifdef XP_WIN |
| || mozilla::IsNaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */ |
| #endif |
| ) |
| 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) { |
| if (b == 0) |
| return JS::GenericNaN(); |
| return js_fmod(a, b); |
| } |
| |
| } // namespace js |
| |
| #endif /* jslibmath_h */ |
