#ifndef _MATH_H
#define _MATH_H

#ifdef __cplusplus
extern "C" {
#endif

#include "features/features.h"

#if defined(_WIN32) || defined(_WIN64)
#if defined _M_IX86 && _M_IX86_FP < 2 && !defined _M_FP_FAST
	typedef long double float_t;
	typedef long double double_t;
#else
	typedef float  float_t;
	typedef double double_t;
#endif
#else
#define __NEED_float_t
#define __NEED_double_t
// #include <bits/alltypes.h>
typedef float  float_t;
typedef double double_t;
#endif

#ifndef _HUGE_ENUF
    #define _HUGE_ENUF  1e+300  // _HUGE_ENUF*_HUGE_ENUF must overflow
#endif

#define INFINITY   ((float)(_HUGE_ENUF * _HUGE_ENUF))
#define HUGE_VALF INFINITY
#define HUGE_VAL  ((double)INFINITY)
#define HUGE_VALL ((long double)INFINITY)
#define NAN        ((float)(INFINITY * 0.0F))

#define MATH_ERRNO  1
#define MATH_ERREXCEPT 2
#define math_errhandling 2

#define FP_ILOGBNAN (-1-0x7fffffff)
#define FP_ILOGB0 FP_ILOGBNAN
#define ULLONG_NSHIFT 0xFFFFFFFFFFFFFFFF
#define ULLONG_SHIFT1 0x7FFFFFFFFFFFFFFF

#define FP_NAN       0
#define FP_INFINITE  1
#define FP_ZERO      2
#define FP_SUBNORMAL 3
#define FP_NORMAL    4

#ifdef __FP_FAST_FMA
#define FP_FAST_FMA 1
#endif

#ifdef __FP_FAST_FMAF
#define FP_FAST_FMAF 1
#endif

#ifdef __FP_FAST_FMAL
#define FP_FAST_FMAL 1
#endif

#define FLT_EVAL_METHOD 0

int __fpclassify(double);
int __fpclassifyf(float);
int __fpclassifyl(long double);

static __inline unsigned __FLOAT_BITS(float __f)
{
	union {float __f; unsigned __i;} __u;
	__u.__f = __f;
	return __u.__i;
}
static __inline unsigned long long __DOUBLE_BITS(double __f)
{
	union {double __f; unsigned long long __i;} __u;
	__u.__f = __f;
	return __u.__i;
}

#define fpclassify(x) ( \
	sizeof(x) == sizeof(float) ? __fpclassifyf(x) : \
	sizeof(x) == sizeof(double) ? __fpclassify(x) : \
	__fpclassifyl(x) )

#define isinf(x) ( \
	sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) == 0x7f800000 : \
	sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & ULLONG_SHIFT1) == 0x7ffULL<<52 : \
	__fpclassifyl(x) == FP_INFINITE)

#define isnan(x) ( \
	sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) > 0x7f800000 : \
	sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & ULLONG_SHIFT1) > 0x7ffULL<<52 : \
	__fpclassifyl(x) == FP_NAN)

#define isnormal(x) ( \
	sizeof(x) == sizeof(float) ? ((__FLOAT_BITS(x)+0x00800000) & 0x7fffffff) >= 0x01000000 : \
	sizeof(x) == sizeof(double) ? ((__DOUBLE_BITS(x)+(1ULL<<52)) & ULLONG_SHIFT1) >= 1ULL<<53 : \
	__fpclassifyl(x) == FP_NORMAL)

#define isfinite(x) ( \
	sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) < 0x7f800000 : \
	sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & ULLONG_SHIFT1) < 0x7ffULL<<52 : \
	__fpclassifyl(x) > FP_INFINITE)

int __signbit(double);
int __signbitf(float);
int __signbitl(long double);

#define signbit(x) ( \
	sizeof(x) == sizeof(float) ? (int)(__FLOAT_BITS(x)>>31) : \
	sizeof(x) == sizeof(double) ? (int)(__DOUBLE_BITS(x)>>63) : \
	__signbitl(x) )

#define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))

#define __ISREL_DEF(rel, op, type) \
static __inline int __is##rel(type __x, type __y) \
{ return !isunordered(__x,__y) && __x op __y; }

__ISREL_DEF(lessf, <, float_t)
__ISREL_DEF(less, <, double_t)
__ISREL_DEF(lessl, <, long double)
__ISREL_DEF(lessequalf, <=, float_t)
__ISREL_DEF(lessequal, <=, double_t)
__ISREL_DEF(lessequall, <=, long double)
__ISREL_DEF(lessgreaterf, !=, float_t)
__ISREL_DEF(lessgreater, !=, double_t)
__ISREL_DEF(lessgreaterl, !=, long double)
__ISREL_DEF(greaterf, >, float_t)
__ISREL_DEF(greater, >, double_t)
__ISREL_DEF(greaterl, >, long double)
__ISREL_DEF(greaterequalf, >=, float_t)
__ISREL_DEF(greaterequal, >=, double_t)
__ISREL_DEF(greaterequall, >=, long double)

#define __tg_pred_2(x, y, p) ( \
	sizeof((x)+(y)) == sizeof(float) ? p##f(x, y) : \
	sizeof((x)+(y)) == sizeof(double) ? p(x, y) : \
	p##l(x, y) )

#define isless(x, y)            __tg_pred_2(x, y, __isless)
#define islessequal(x, y)       __tg_pred_2(x, y, __islessequal)
#define islessgreater(x, y)     __tg_pred_2(x, y, __islessgreater)
#define isgreater(x, y)         __tg_pred_2(x, y, __isgreater)
#define isgreaterequal(x, y)    __tg_pred_2(x, y, __isgreaterequal)

double      acos(double);
double      asin(double);
double      atan(double);
double      atan2(double, double);
double      cbrt(double);
double      ceil(double);
double      cos(double);
double		degrees(double);
double      exp(double);
double      fabs(double);
int			factorial(int);
double      floor(double);
double      fmax(double, double);
double      fmin(double, double);
double      fmod(double, double);
double		fsum(double*, int);
int			gcd(int, int);
double      log(double);
double      log10(double);
double      log2(double);
double      modf(double, double *);
double      pow(double, double);
double		radians(double);
double      scalbn(double, int);
double      sin(double);
double      sqrt(double);
double      tan(double);
double      trunc(double);


#undef  MAXFLOAT
#define MAXFLOAT        3.40282346638528859812e+38F

#define M_DEG2RAD		0.017453292519943295	/* pi/180 */
#define M_E             2.7182818284590452354   /* e */
#define M_LOG2E         1.4426950408889634074   /* log_2 e */
#define M_LOG10E        0.43429448190325182765  /* log_10 e */
#define M_LN2           0.69314718055994530942  /* log_e 2 */
#define M_LN10          2.30258509299404568402  /* log_e 10 */
#define M_PI            3.14159265358979323846  /* pi */
#define M_PI_2          1.57079632679489661923  /* pi/2 */
#define M_PI_4          0.78539816339744830962  /* pi/4 */
#define M_1_PI          0.31830988618379067154  /* 1/pi */
#define M_2_PI          0.63661977236758134308  /* 2/pi */
#define M_RAD2DEG		57.29577951308232		/* 180/pi */
#define M_2_SQRTPI      1.12837916709551257390  /* 2/sqrt(pi) */
#define M_SQRT2         1.41421356237309504880  /* sqrt(2) */
#define M_SQRT1_2       0.70710678118654752440  /* 1/sqrt(2) */

// extern int signgam;

// double      j0(double);
// double      j1(double);
// double      jn(int, double);

// double      y0(double);
// double      y1(double);
// double      yn(int, double);

#define HUGE            3.40282346638528859812e+38F

// double      drem(double, double);
// float       dremf(float, float);

// int         finite(double);
// int         finitef(float);

// double      scalb(double, double);
// float       scalbf(float, float);

// double      significand(double);
// float       significandf(float);

// double      lgamma_r(double, int*);
// float       lgammaf_r(float, int*);

// float       j0f(float);
// float       j1f(float);
// float       jnf(int, float);

// float       y0f(float);
// float       y1f(float);
// float       ynf(int, float);


#ifdef __cplusplus
}
#endif

#endif