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#ifndef Py_PYMATH_H

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#define Py_PYMATH_H

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

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/**************************************************************************

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Symbols and macros to supply platform-independent interfaces to mathematical

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functions and constants

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**************************************************************************/

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

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

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* functions.

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

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#ifndef HAVE_COPYSIGN

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extern double copysign(double, double);

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#endif

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#ifndef HAVE_ROUND

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extern double round(double);

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#endif

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#ifndef HAVE_HYPOT

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extern double hypot(double, double);

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#endif

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/* extra declarations */

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#ifndef _MSC_VER

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#ifndef __STDC__

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extern double fmod (double, double);

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extern double frexp (double, int *);

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extern double ldexp (double, int);

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extern double modf (double, double *);

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extern double pow(double, double);

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#endif /* __STDC__ */

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#endif /* _MSC_VER */

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#ifdef _OSF_SOURCE

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

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extern int finite(double);

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extern double copysign(double, double);

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#endif

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/* High precision definition of pi and e (Euler)

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* The values are taken from libc6's math.h.

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#ifndef Py_MATH_PIl

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#define Py_MATH_PIl 3.1415926535897932384626433832795029L

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#endif

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#ifndef Py_MATH_PI

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#define Py_MATH_PI 3.14159265358979323846

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#endif

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#ifndef Py_MATH_El

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#define Py_MATH_El 2.7182818284590452353602874713526625L

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#endif

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#ifndef Py_MATH_E

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#define Py_MATH_E 2.7182818284590452354

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#endif

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

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

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nothing. */

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

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#ifndef Py_FORCE_DOUBLE

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# ifdef X87_DOUBLE_ROUNDING

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PyAPI_FUNC(double) _Py_force_double(double);

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

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# else

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# define Py_FORCE_DOUBLE(X) (X)

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# endif

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#endif

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#ifdef HAVE_GCC_ASM_FOR_X87

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PyAPI_FUNC(unsigned short) _Py_get_387controlword(void);

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PyAPI_FUNC(void) _Py_set_387controlword(unsigned short);

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#endif

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/* Py_IS_NAN(X)

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

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* Caution:

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* X is evaluated more than once.

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

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

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* a platform where it doesn't work.

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

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#ifndef Py_IS_NAN

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#if defined HAVE_DECL_ISNAN && HAVE_DECL_ISNAN == 1

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#define Py_IS_NAN(X) isnan(X)

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#else

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

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#endif

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#endif

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/* Py_IS_INFINITY(X)

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

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* Caution:

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* X is evaluated more than once.

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

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

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

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* Py_FORCE_DOUBLE is used to avoid getting false negatives from a

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

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

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

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#ifndef Py_IS_INFINITY

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# if defined HAVE_DECL_ISINF && HAVE_DECL_ISINF == 1

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# define Py_IS_INFINITY(X) isinf(X)

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# else

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

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

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# endif

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#endif

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/* Py_IS_FINITE(X)

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

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

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* macro for this particular test is useful

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

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#ifndef Py_IS_FINITE

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#if defined HAVE_DECL_ISFINITE && HAVE_DECL_ISFINITE == 1

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#define Py_IS_FINITE(X) isfinite(X)

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#elif defined HAVE_FINITE

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#define Py_IS_FINITE(X) finite(X)

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#else

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

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#endif

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#endif

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/* HUGE_VAL is supposed to expand to a positive double infinity. Python

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* uses Py_HUGE_VAL instead because some platforms are broken in this

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* respect. We used to embed code in pyport.h to try to worm around that,

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* but different platforms are broken in conflicting ways. If you're on

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* a platform where HUGE_VAL is defined incorrectly, fiddle your Python

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* config to #define Py_HUGE_VAL to something that works on your platform.

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#ifndef Py_HUGE_VAL

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#define Py_HUGE_VAL HUGE_VAL

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#endif

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/* Py_NAN

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* A value that evaluates to a NaN. On IEEE 754 platforms INF*0 or

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* INF/INF works. Define Py_NO_NAN in pyconfig.h if your platform

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* doesn't support NaNs.

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#if !defined(Py_NAN) && !defined(Py_NO_NAN)

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#if !defined(__INTEL_COMPILER)

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#define Py_NAN (Py_HUGE_VAL * 0.)

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#else /* __INTEL_COMPILER */

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#if defined(ICC_NAN_STRICT)

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#pragma float_control(push)

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#pragma float_control(precise, on)

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#pragma float_control(except, on)

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#if defined(_MSC_VER)

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__declspec(noinline)

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#else /* Linux */

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__attribute__((noinline))

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#endif /* _MSC_VER */

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static double __icc_nan()

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{

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return sqrt(-1.0);

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}

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#pragma float_control (pop)

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#define Py_NAN __icc_nan()

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#else /* ICC_NAN_RELAXED as default for Intel Compiler */

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static union { unsigned char buf[8]; double __icc_nan; } __nan_store = {0,0,0,0,0,0,0xf8,0x7f};

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#define Py_NAN (__nan_store.__icc_nan)

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#endif /* ICC_NAN_STRICT */

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#endif /* __INTEL_COMPILER */

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#endif

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/* Py_OVERFLOWED(X)

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

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

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* result.

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* Caution:

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

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

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

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

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

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

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

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

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* in non-overflow cases.

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* X is evaluated more than once.

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

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

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

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

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

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* gcc 2.95.3.

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

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* around a FPE bug on that platform.

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

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#define Py_OVERFLOWED(X) isinf(X)

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#else

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

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(X) == Py_HUGE_VAL || \

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(X) == -Py_HUGE_VAL))

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#endif

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#endif /* Py_PYMATH_H */

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