| // Symbols and macros to supply platform-independent interfaces to mathematical |
| // functions and constants. |
| |
| #ifndef Py_PYMATH_H |
| #define Py_PYMATH_H |
| |
| /* High precision definition of pi and e (Euler) |
| * The values are taken from libc6's math.h. |
| */ |
| #ifndef Py_MATH_PIl |
| #define Py_MATH_PIl 3.1415926535897932384626433832795029L |
| #endif |
| #ifndef Py_MATH_PI |
| #define Py_MATH_PI 3.14159265358979323846 |
| #endif |
| |
| #ifndef Py_MATH_El |
| #define Py_MATH_El 2.7182818284590452353602874713526625L |
| #endif |
| |
| #ifndef Py_MATH_E |
| #define Py_MATH_E 2.7182818284590452354 |
| #endif |
| |
| /* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */ |
| #ifndef Py_MATH_TAU |
| #define Py_MATH_TAU 6.2831853071795864769252867665590057683943L |
| #endif |
| |
| // Py_IS_NAN(X) |
| // Return 1 if float or double arg is a NaN, else 0. |
| #define Py_IS_NAN(X) isnan(X) |
| |
| // Py_IS_INFINITY(X) |
| // Return 1 if float or double arg is an infinity, else 0. |
| #define Py_IS_INFINITY(X) isinf(X) |
| |
| // Py_IS_FINITE(X) |
| // Return 1 if float or double arg is neither infinite nor NAN, else 0. |
| #define Py_IS_FINITE(X) isfinite(X) |
| |
| /* HUGE_VAL is supposed to expand to a positive double infinity. Python |
| * uses Py_HUGE_VAL instead because some platforms are broken in this |
| * respect. We used to embed code in pyport.h to try to worm around that, |
| * but different platforms are broken in conflicting ways. If you're on |
| * a platform where HUGE_VAL is defined incorrectly, fiddle your Python |
| * config to #define Py_HUGE_VAL to something that works on your platform. |
| */ |
| #ifndef Py_HUGE_VAL |
| # define Py_HUGE_VAL HUGE_VAL |
| #endif |
| |
| /* Py_NAN |
| * A value that evaluates to a NaN. On IEEE 754 platforms INF*0 or |
| * INF/INF works. Define Py_NO_NAN in pyconfig.h if your platform |
| * doesn't support NaNs. |
| */ |
| #if !defined(Py_NAN) && !defined(Py_NO_NAN) |
| # if !defined(__INTEL_COMPILER) |
| # define Py_NAN (Py_HUGE_VAL * 0.) |
| # else /* __INTEL_COMPILER */ |
| # if defined(ICC_NAN_STRICT) |
| #pragma float_control(push) |
| #pragma float_control(precise, on) |
| #pragma float_control(except, on) |
| Py_NO_INLINE static double __icc_nan() |
| { |
| return sqrt(-1.0); |
| } |
| #pragma float_control (pop) |
| # define Py_NAN __icc_nan() |
| # else /* ICC_NAN_RELAXED as default for Intel Compiler */ |
| static const union { unsigned char buf[8]; double __icc_nan; } __nan_store = {0,0,0,0,0,0,0xf8,0x7f}; |
| # define Py_NAN (__nan_store.__icc_nan) |
| # endif /* ICC_NAN_STRICT */ |
| # endif /* __INTEL_COMPILER */ |
| #endif |
| |
| #endif /* Py_PYMATH_H */ |