android / platform / prebuilts / python / darwin-x86 / 2.7.5 / refs/tags/android-7.1.1_r2 / . / include / python2.7 / pymath.h

#ifndef Py_PYMATH_H | |

#define Py_PYMATH_H | |

#include "pyconfig.h" /* include for defines */ | |

/************************************************************************** | |

Symbols and macros to supply platform-independent interfaces to mathematical | |

functions and constants | |

**************************************************************************/ | |

/* Python provides implementations for copysign, round and hypot in | |

* Python/pymath.c just in case your math library doesn't provide the | |

* functions. | |

* | |

*Note: PC/pyconfig.h defines copysign as _copysign | |

*/ | |

#ifndef HAVE_COPYSIGN | |

extern double copysign(double, double); | |

#endif | |

#ifndef HAVE_ROUND | |

extern double round(double); | |

#endif | |

#ifndef HAVE_HYPOT | |

extern double hypot(double, double); | |

#endif | |

/* extra declarations */ | |

#ifndef _MSC_VER | |

#ifndef __STDC__ | |

extern double fmod (double, double); | |

extern double frexp (double, int *); | |

extern double ldexp (double, int); | |

extern double modf (double, double *); | |

extern double pow(double, double); | |

#endif /* __STDC__ */ | |

#endif /* _MSC_VER */ | |

#ifdef _OSF_SOURCE | |

/* OSF1 5.1 doesn't make these available with XOPEN_SOURCE_EXTENDED defined */ | |

extern int finite(double); | |

extern double copysign(double, double); | |

#endif | |

/* High precision defintion 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 | |

/* On x86, Py_FORCE_DOUBLE forces a floating-point number out of an x87 FPU | |

register and into a 64-bit memory location, rounding from extended | |

precision to double precision in the process. On other platforms it does | |

nothing. */ | |

/* we take double rounding as evidence of x87 usage */ | |

#ifndef Py_FORCE_DOUBLE | |

# ifdef X87_DOUBLE_ROUNDING | |

PyAPI_FUNC(double) _Py_force_double(double); | |

# define Py_FORCE_DOUBLE(X) (_Py_force_double(X)) | |

# else | |

# define Py_FORCE_DOUBLE(X) (X) | |

# endif | |

#endif | |

#ifdef HAVE_GCC_ASM_FOR_X87 | |

PyAPI_FUNC(unsigned short) _Py_get_387controlword(void); | |

PyAPI_FUNC(void) _Py_set_387controlword(unsigned short); | |

#endif | |

/* Py_IS_NAN(X) | |

* Return 1 if float or double arg is a NaN, else 0. | |

* Caution: | |

* X is evaluated more than once. | |

* This may not work on all platforms. Each platform has *some* | |

* way to spell this, though -- override in pyconfig.h if you have | |

* a platform where it doesn't work. | |

* Note: PC/pyconfig.h defines Py_IS_NAN as _isnan | |

*/ | |

#ifndef Py_IS_NAN | |

#if defined HAVE_DECL_ISNAN && HAVE_DECL_ISNAN == 1 | |

#define Py_IS_NAN(X) isnan(X) | |

#else | |

#define Py_IS_NAN(X) ((X) != (X)) | |

#endif | |

#endif | |

/* Py_IS_INFINITY(X) | |

* Return 1 if float or double arg is an infinity, else 0. | |

* Caution: | |

* X is evaluated more than once. | |

* This implementation may set the underflow flag if |X| is very small; | |

* it really can't be implemented correctly (& easily) before C99. | |

* Override in pyconfig.h if you have a better spelling on your platform. | |

* Py_FORCE_DOUBLE is used to avoid getting false negatives from a | |

* non-infinite value v sitting in an 80-bit x87 register such that | |

* v becomes infinite when spilled from the register to 64-bit memory. | |

* Note: PC/pyconfig.h defines Py_IS_INFINITY as _isinf | |

* FIXME: PC/pyconfig.h defines Py_IS_INFINITY as (!_finite(X) && !_isnan(X)) | |

* so that above note isn't correct !!! | |

*/ | |

#ifndef Py_IS_INFINITY | |

# if defined HAVE_DECL_ISINF && HAVE_DECL_ISINF == 1 | |

# define Py_IS_INFINITY(X) isinf(X) | |

# else | |

# define Py_IS_INFINITY(X) ((X) && \ | |

(Py_FORCE_DOUBLE(X)*0.5 == Py_FORCE_DOUBLE(X))) | |

# endif | |

#endif | |

/* Py_IS_FINITE(X) | |

* Return 1 if float or double arg is neither infinite nor NAN, else 0. | |

* Some compilers (e.g. VisualStudio) have intrisics for this, so a special | |

* macro for this particular test is useful | |

* Note: PC/pyconfig.h defines Py_IS_FINITE as _finite | |

*/ | |

#ifndef Py_IS_FINITE | |

#if defined HAVE_DECL_ISFINITE && HAVE_DECL_ISFINITE == 1 | |

#define Py_IS_FINITE(X) isfinite(X) | |

#elif defined HAVE_FINITE | |

#define Py_IS_FINITE(X) finite(X) | |

#else | |

#define Py_IS_FINITE(X) (!Py_IS_INFINITY(X) && !Py_IS_NAN(X)) | |

#endif | |

#endif | |

/* 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) | |

#define Py_NAN (Py_HUGE_VAL * 0.) | |

#endif | |

/* Py_OVERFLOWED(X) | |

* Return 1 iff a libm function overflowed. Set errno to 0 before calling | |

* a libm function, and invoke this macro after, passing the function | |

* result. | |

* Caution: | |

* This isn't reliable. C99 no longer requires libm to set errno under | |

* any exceptional condition, but does require +- HUGE_VAL return | |

* values on overflow. A 754 box *probably* maps HUGE_VAL to a | |

* double infinity, and we're cool if that's so, unless the input | |

* was an infinity and an infinity is the expected result. A C89 | |

* system sets errno to ERANGE, so we check for that too. We're | |

* out of luck if a C99 754 box doesn't map HUGE_VAL to +Inf, or | |

* if the returned result is a NaN, or if a C89 box returns HUGE_VAL | |

* in non-overflow cases. | |

* X is evaluated more than once. | |

* Some platforms have better way to spell this, so expect some #ifdef'ery. | |

* | |

* OpenBSD uses 'isinf()' because a compiler bug on that platform causes | |

* the longer macro version to be mis-compiled. This isn't optimal, and | |

* should be removed once a newer compiler is available on that platform. | |

* The system that had the failure was running OpenBSD 3.2 on Intel, with | |

* gcc 2.95.3. | |

* | |

* According to Tim's checkin, the FreeBSD systems use isinf() to work | |

* around a FPE bug on that platform. | |

*/ | |

#if defined(__FreeBSD__) || defined(__OpenBSD__) | |

#define Py_OVERFLOWED(X) isinf(X) | |

#else | |

#define Py_OVERFLOWED(X) ((X) != 0.0 && (errno == ERANGE || \ | |

(X) == Py_HUGE_VAL || \ | |

(X) == -Py_HUGE_VAL)) | |

#endif | |

#endif /* Py_PYMATH_H */ |