The Tor Browser / file comparison
comparison: js/src/jslibmath.h
js/src/jslibmath.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:ed113dc21bb0 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef jslibmath_h | |
| 8 #define jslibmath_h | |
| 9 | |
| 10 #include "mozilla/FloatingPoint.h" | |
| 11 | |
| 12 #include <math.h> | |
| 13 | |
| 14 #include "jsnum.h" | |
| 15 | |
| 16 /* | |
| 17 * Use system provided math routines. | |
| 18 */ | |
| 19 | |
| 20 /* The right copysign function is not always named the same thing. */ | |
| 21 #ifdef __GNUC__ | |
| 22 #define js_copysign __builtin_copysign | |
| 23 #elif defined _WIN32 | |
| 24 #define js_copysign _copysign | |
| 25 #else | |
| 26 #define js_copysign copysign | |
| 27 #endif | |
| 28 | |
| 29 /* Consistency wrapper for platform deviations in fmod() */ | |
| 30 static inline double | |
| 31 js_fmod(double d, double d2) | |
| 32 { | |
| 33 #ifdef XP_WIN | |
| 34 /* | |
| 35 * Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. | |
| 36 * Workaround MS fmod bug where -0 % -N => 0, not -0. | |
| 37 */ | |
| 38 if ((mozilla::IsFinite(d) && mozilla::IsInfinite(d2)) || | |
| 39 (d == 0 && mozilla::IsFinite(d2))) { | |
| 40 return d; | |
| 41 } | |
| 42 #endif | |
| 43 return fmod(d, d2); | |
| 44 } | |
| 45 | |
| 46 namespace js { | |
| 47 | |
| 48 inline double | |
| 49 NumberDiv(double a, double b) | |
| 50 { | |
| 51 if (b == 0) { | |
| 52 if (a == 0 || mozilla::IsNaN(a) | |
| 53 #ifdef XP_WIN | |
| 54 || mozilla::IsNaN(b) /* XXX MSVC miscompiles such that (NaN == 0) */ | |
| 55 #endif | |
| 56 ) | |
| 57 return JS::GenericNaN(); | |
| 58 | |
| 59 if (mozilla::IsNegative(a) != mozilla::IsNegative(b)) | |
| 60 return mozilla::NegativeInfinity<double>(); | |
| 61 return mozilla::PositiveInfinity<double>(); | |
| 62 } | |
| 63 | |
| 64 return a / b; | |
| 65 } | |
| 66 | |
| 67 inline double | |
| 68 NumberMod(double a, double b) { | |
| 69 if (b == 0) | |
| 70 return JS::GenericNaN(); | |
| 71 return js_fmod(a, b); | |
| 72 } | |
| 73 | |
| 74 } | |
| 75 | |
| 76 #endif /* jslibmath_h */ |
