js/src/jslibmath.h

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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  17  * March 31, 1998.
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  40
  41 #ifndef _LIBMATH_H
  42 #define _LIBMATH_H
  43
  44 #include <math.h>
  45 #ifdef XP_WIN
  46 # include "jsnum.h"
  47 #endif
  48
  49 /*
  50  * Use system provided math routines.
  51  */
  52
  53 /* The right copysign function is not always named the same thing. */
  54 #if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
  55 #define js_copysign __builtin_copysign
  56 #elif defined WINCE
  57 #define js_copysign _copysign
  58 #elif defined _WIN32
  59 #if _MSC_VER < 1400
  60 /* Try to work around apparent _copysign bustage in VC7.x. */
  61 #define js_copysign js_copysign
  62 extern double js_copysign(double, double);
  63 #else
  64 #define js_copysign _copysign
  65 #endif
  66 #else
  67 #define js_copysign copysign
  68 #endif
  69
  70 /* Consistency wrapper for platform deviations in fmod() */
  71 static inline double
  72 js_fmod(double d, double d2)
  73 {
  74 #ifdef XP_WIN
  75     /*
  76      * Workaround MS fmod bug where 42 % (1/0) => NaN, not 42.
  77      * Workaround MS fmod bug where -0 % -N => 0, not -0.
  78      */
  79     if ((JSDOUBLE_IS_FINITE(d) && JSDOUBLE_IS_INFINITE(d2)) ||
  80         (d == 0 && JSDOUBLE_IS_FINITE(d2))) {
  81         return d;
  82     }
  83 #endif
  84     return fmod(d, d2);
  85 }
  86
  87 #endif /* _LIBMATH_H */
  88