path: root/newlib/libc/include/math.h

#ifndef  _MATH_H_

#define  _MATH_H_

#include <sys/reent.h>
#include <sys/cdefs.h>
#include <machine/ieeefp.h>
#include "_ansi.h"

_BEGIN_STD_C

/* Natural log of 2 */
#define _M_LN2        0.693147180559945309417

#if __GNUC_PREREQ (3, 3)
 /* gcc >= 3.3 implicitly defines builtins for HUGE_VALx values.  */

# ifndef HUGE_VAL
#  define HUGE_VAL (__builtin_huge_val())
# endif

# ifndef HUGE_VALF
#  define HUGE_VALF (__builtin_huge_valf())
# endif

# ifndef HUGE_VALL
#  define HUGE_VALL (__builtin_huge_vall())
# endif

# ifndef INFINITY
#  define INFINITY (__builtin_inff())
# endif

# ifndef NAN
#  define NAN (__builtin_nanf(""))
# endif

#else /* !gcc >= 3.3  */

 /*      No builtins.  Use fixed defines instead.  (All 3 HUGE plus the INFINITY
  * and NAN macros are required to be constant expressions.  Using a variable--
  * even a static const--does not meet this requirement, as it cannot be
  * evaluated at translation time.)
  *      The infinities are done using numbers that are far in excess of
  * something that would be expected to be encountered in a floating-point
  * implementation.  (A more certain way uses values from float.h, but that is
  * avoided because system includes are not supposed to include each other.)
  *      This method might produce warnings from some compilers.  (It does in
  * newer GCCs, but not for ones that would hit this #else.)  If this happens,
  * please report details to the Newlib mailing list.  */

 #ifndef HUGE_VAL
  #define HUGE_VAL (1.0e999999999)
 #endif

 #ifndef HUGE_VALF
  #define HUGE_VALF (1.0e999999999F)
 #endif

 #if !defined(HUGE_VALL)  &&  defined(_HAVE_LONG_DOUBLE)
  #define HUGE_VALL (1.0e999999999L)
 #endif

 #if !defined(INFINITY)
  #define INFINITY (HUGE_VALF)
 #endif

 #if !defined(NAN)
  #if defined(__GNUC__)  &&  defined(__cplusplus)
    /* Exception:  older g++ versions warn about the divide by 0 used in the
     * normal case (even though older gccs do not).  This trick suppresses the
     * warning, but causes errors for plain gcc, so is only used in the one
     * special case.  */
    static const union { __ULong __i[1]; float __d; } __Nanf = {0x7FC00000};
    #define NAN (__Nanf.__d)
  #else
    #define NAN (0.0F/0.0F)
  #endif
 #endif

#endif /* !gcc >= 3.3  */

/* Reentrant ANSI C functions.  */

#ifndef __math_68881
extern double atan (double);
extern double cos (double);
extern double sin (double);
extern double tan (double);
extern double tanh (double);
extern double frexp (double, int *);
extern double modf (double, double *);
extern double ceil (double);
extern double fabs (double);
extern double floor (double);
#endif /* ! defined (__math_68881) */

/* Non reentrant ANSI C functions.  */

#ifndef _REENT_ONLY
#ifndef __math_68881
extern double acos (double);
extern double asin (double);
extern double atan2 (double, double);
extern double cosh (double);
extern double sinh (double);
extern double exp (double);
extern double ldexp (double, int);
extern double log (double);
extern double log10 (double);
extern double pow (double, double);
extern double sqrt (double);
extern double fmod (double, double);
#endif /* ! defined (__math_68881) */
#endif /* ! defined (_REENT_ONLY) */

#if __MISC_VISIBLE
extern int finite (double);
extern int finitef (float);
extern int finitel (long double);
extern int isinff (float);
extern int isnanf (float);
#ifdef __CYGWIN__ /* not implemented in newlib yet */
extern int isinfl (long double);
extern int isnanl (long double);
#endif
#if !defined(__cplusplus) || __cplusplus < 201103L
extern int isinf (double);
#endif
#endif /* __MISC_VISIBLE */
#if (__MISC_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 600)) \
  && (!defined(__cplusplus) || __cplusplus < 201103L)
extern int isnan (double);
#endif

#if __ISO_C_VISIBLE >= 1999
/* ISO C99 types and macros. */

/* FIXME:  FLT_EVAL_METHOD should somehow be gotten from float.h (which is hard,
 * considering that the standard says the includes it defines should not
 * include other includes that it defines) and that value used.  (This can be
 * solved, but autoconf has a bug which makes the solution more difficult, so
 * it has been skipped for now.)  */
#if !defined(FLT_EVAL_METHOD) && defined(__FLT_EVAL_METHOD__)
  #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
  #define __TMP_FLT_EVAL_METHOD
#endif /* FLT_EVAL_METHOD */
#if defined FLT_EVAL_METHOD
  #if FLT_EVAL_METHOD == 0
    typedef float  float_t;
    typedef double double_t;
   #elif FLT_EVAL_METHOD == 1
    typedef double float_t;
    typedef double double_t;
   #elif FLT_EVAL_METHOD == 2
    typedef long double float_t;
    typedef long double double_t;
   #else
    /* Implementation-defined.  Assume float_t and double_t have been
     * defined previously for this configuration (e.g. config.h). */
  #endif
#else
    /* Assume basic definitions.  */
    typedef float  float_t;
    typedef double double_t;
#endif
#if defined(__TMP_FLT_EVAL_METHOD)
  #undef FLT_EVAL_METHOD
#endif

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

#ifndef FP_ILOGB0
# define FP_ILOGB0 (-__INT_MAX__)
#endif
#ifndef FP_ILOGBNAN
# define FP_ILOGBNAN __INT_MAX__
#endif

#ifndef MATH_ERRNO
# define MATH_ERRNO 1
#endif
#ifndef MATH_ERREXCEPT
# define MATH_ERREXCEPT 2
#endif
#ifndef math_errhandling
# define math_errhandling MATH_ERRNO
#endif

extern int __isinff (float x);
extern int __isinfd (double x);
extern int __isnanf (float x);
extern int __isnand (double x);
extern int __fpclassifyf (float x);
extern int __fpclassifyd (double x);
extern int __signbitf (float x);
extern int __signbitd (double x);

/* Note: isinf and isnan were once functions in newlib that took double
 *       arguments.  C99 specifies that these names are reserved for macros
 *       supporting multiple floating point types.  Thus, they are
 *       now defined as macros.  Implementations of the old functions
 *       taking double arguments still exist for compatibility purposes
 *       (prototypes for them are earlier in this header).  */

#if __GNUC_PREREQ (4, 4)
  #define fpclassify(__x) (__builtin_fpclassify (FP_NAN, FP_INFINITE, \
						 FP_NORMAL, FP_SUBNORMAL, \
						 FP_ZERO, __x))
  #ifndef isfinite
    #define isfinite(__x)	(__builtin_isfinite (__x))
  #endif
  #ifndef isinf
    #define isinf(__x) (__builtin_isinf_sign (__x))
  #endif
  #ifndef isnan
    #define isnan(__x) (__builtin_isnan (__x))
  #endif
  #define isnormal(__x) (__builtin_isnormal (__x))
#else
  #define fpclassify(__x) \
	  ((sizeof(__x) == sizeof(float))  ? __fpclassifyf(__x) : \
	  __fpclassifyd(__x))
  #ifndef isfinite
    #define isfinite(__y) \
	    (__extension__ ({int __cy = fpclassify(__y); \
			     __cy != FP_INFINITE && __cy != FP_NAN;}))
  #endif
  #ifndef isinf
    #define isinf(__x) (fpclassify(__x) == FP_INFINITE)
  #endif
  #ifndef isnan
    #define isnan(__x) (fpclassify(__x) == FP_NAN)
  #endif
  #define isnormal(__x) (fpclassify(__x) == FP_NORMAL)
#endif

#if __GNUC_PREREQ (4, 0)
  #if defined(_HAVE_LONG_DOUBLE)
    #define signbit(__x) \
	    ((sizeof(__x) == sizeof(float))  ? __builtin_signbitf(__x) : \
	     (sizeof(__x) == sizeof(double)) ? __builtin_signbit (__x) : \
					       __builtin_signbitl(__x))
  #else
    #define signbit(__x) \
	    ((sizeof(__x) == sizeof(float))  ? __builtin_signbitf(__x) : \
					       __builtin_signbit (__x))
  #endif
#else
  #define signbit(__x) \
	  ((sizeof(__x) == sizeof(float))  ?  __signbitf(__x) : \
		  __signbitd(__x))
#endif

#if __GNUC_PREREQ (2, 97)
#define isgreater(__x,__y)	(__builtin_isgreater (__x, __y))
#define isgreaterequal(__x,__y)	(__builtin_isgreaterequal (__x, __y))
#define isless(__x,__y)		(__builtin_isless (__x, __y))
#define islessequal(__x,__y)	(__builtin_islessequal (__x, __y))
#define islessgreater(__x,__y)	(__builtin_islessgreater (__x, __y))
#define isunordered(__x,__y)	(__builtin_isunordered (__x, __y))
#else
#define isgreater(x,y) \
          (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \
                           !isunordered(__x,__y) && (__x > __y);}))
#define isgreaterequal(x,y) \
          (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \
                           !isunordered(__x,__y) && (__x >= __y);}))
#define isless(x,y) \
          (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \
                           !isunordered(__x,__y) && (__x < __y);}))
#define islessequal(x,y) \
          (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \
                           !isunordered(__x,__y) && (__x <= __y);}))
#define islessgreater(x,y) \
          (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \
                           !isunordered(__x,__y) && (__x < __y || __x > __y);}))

#define isunordered(a,b) \
          (__extension__ ({__typeof__(a) __a = (a); __typeof__(b) __b = (b); \
                           fpclassify(__a) == FP_NAN || fpclassify(__b) == FP_NAN;}))
#endif

/* Non ANSI double precision functions.  */

extern double infinity (void);
extern double nan (const char *);
extern double copysign (double, double);
extern double logb (double);
extern int ilogb (double);

extern double asinh (double);
extern double cbrt (double);
extern double nextafter (double, double);
extern double rint (double);
extern double scalbn (double, int);

extern double exp2 (double);
extern double scalbln (double, long int);
extern double tgamma (double);
extern double nearbyint (double);
extern long int lrint (double);
extern long long int llrint (double);
extern double round (double);
extern long int lround (double);
extern long long int llround (double);
extern double trunc (double);
extern double remquo (double, double, int *);
extern double fdim (double, double);
extern double fmax (double, double);
extern double fmin (double, double);
extern double fma (double, double, double);

#ifndef __math_68881
extern double log1p (double);
extern double expm1 (double);
#endif /* ! defined (__math_68881) */

#ifndef _REENT_ONLY
extern double acosh (double);
extern double atanh (double);
extern double remainder (double, double);
extern double gamma (double);
extern double lgamma (double);
extern double erf (double);
extern double erfc (double);
extern double log2 (double);
#if !defined(__cplusplus)
#define log2(x) (log (x) / _M_LN2)
#endif

#ifndef __math_68881
extern double hypot (double, double);
#endif

#endif /* ! defined (_REENT_ONLY) */

/* Single precision versions of ANSI functions.  */

extern float atanf (float);
extern float cosf (float);
extern float sinf (float);
extern float tanf (float);
extern float tanhf (float);
extern float frexpf (float, int *);
extern float modff (float, float *);
extern float ceilf (float);
extern float fabsf (float);
extern float floorf (float);

#ifndef _REENT_ONLY
extern float acosf (float);
extern float asinf (float);
extern float atan2f (float, float);
extern float coshf (float);
extern float sinhf (float);
extern float expf (float);
extern float ldexpf (float, int);
extern float logf (float);
extern float log10f (float);
extern float powf (float, float);
extern float sqrtf (float);
extern float fmodf (float, float);
#endif /* ! defined (_REENT_ONLY) */

/* Other single precision functions.  */

extern float exp2f (float);
extern float scalblnf (float, long int);
extern float tgammaf (float);
extern float nearbyintf (float);
extern long int lrintf (float);
extern long long int llrintf (float);
extern float roundf (float);
extern long int lroundf (float);
extern long long int llroundf (float);
extern float truncf (float);
extern float remquof (float, float, int *);
extern float fdimf (float, float);
extern float fmaxf (float, float);
extern float fminf (float, float);
extern float fmaf (float, float, float);

extern float infinityf (void);
extern float nanf (const char *);
extern float copysignf (float, float);
extern float logbf (float);
extern int ilogbf (float);

extern float asinhf (float);
extern float cbrtf (float);
extern float nextafterf (float, float);
extern float rintf (float);
extern float scalbnf (float, int);
extern float log1pf (float);
extern float expm1f (float);

#ifndef _REENT_ONLY
extern float acoshf (float);
extern float atanhf (float);
extern float remainderf (float, float);
extern float gammaf (float);
extern float lgammaf (float);
extern float erff (float);
extern float erfcf (float);
extern float log2f (float);
extern float hypotf (float, float);
#endif /* ! defined (_REENT_ONLY) */

/* Newlib doesn't fully support long double math functions so far.
   On platforms where long double equals double the long double functions
   simply call the double functions.  On Cygwin the long double functions
   are implemented independently from newlib to be able to use optimized
   assembler functions despite using the Microsoft x86_64 ABI. */
#if defined (_LDBL_EQ_DBL) || defined (__CYGWIN__)
/* Reentrant ANSI C functions.  */
#ifndef __math_68881
extern long double atanl (long double);
extern long double cosl (long double);
extern long double sinl (long double);
extern long double tanl (long double);
extern long double tanhl (long double);
extern long double frexpl (long double, int *);
extern long double modfl (long double, long double *);
extern long double ceill (long double);
extern long double fabsl (long double);
extern long double floorl (long double);
extern long double log1pl (long double);
extern long double expm1l (long double);
#endif /* ! defined (__math_68881) */
/* Non reentrant ANSI C functions.  */
#ifndef _REENT_ONLY
#ifndef __math_68881
extern long double acosl (long double);
extern long double asinl (long double);
extern long double atan2l (long double, long double);
extern long double coshl (long double);
extern long double sinhl (long double);
extern long double expl (long double);
extern long double ldexpl (long double, int);
extern long double logl (long double);
extern long double log10l (long double);
extern long double powl (long double, long double);
extern long double sqrtl (long double);
extern long double fmodl (long double, long double);
extern long double hypotl (long double, long double);
#endif /* ! defined (__math_68881) */
#endif /* ! defined (_REENT_ONLY) */
extern long double copysignl (long double, long double);
extern long double nanl (const char *);
extern int ilogbl (long double);
extern long double asinhl (long double);
extern long double cbrtl (long double);
extern long double nextafterl (long double, long double);
extern float nexttowardf (float, long double);
extern double nexttoward (double, long double);
extern long double nexttowardl (long double, long double);
extern long double logbl (long double);
extern long double log2l (long double);
extern long double rintl (long double);
extern long double scalbnl (long double, int);
extern long double exp2l (long double);
extern long double scalblnl (long double, long);
extern long double tgammal (long double);
extern long double nearbyintl (long double);
extern long int lrintl (long double);
extern long long int llrintl (long double);
extern long double roundl (long double);
extern long lroundl (long double);
extern long long int llroundl (long double);
extern long double truncl (long double);
extern long double remquol (long double, long double, int *);
extern long double fdiml (long double, long double);
extern long double fmaxl (long double, long double);
extern long double fminl (long double, long double);
extern long double fmal (long double, long double, long double);
#ifndef _REENT_ONLY
extern long double acoshl (long double);
extern long double atanhl (long double);
extern long double remainderl (long double, long double);
extern long double lgammal (long double);
extern long double erfl (long double);
extern long double erfcl (long double);
#endif /* ! defined (_REENT_ONLY) */
#else /* !_LDBL_EQ_DBL && !__CYGWIN__ */
extern long double hypotl (long double, long double);
extern long double sqrtl (long double);
#ifdef __i386__
/* Other long double precision functions.  */
extern _LONG_DOUBLE rintl (_LONG_DOUBLE);
extern long int lrintl (_LONG_DOUBLE);
extern long long int llrintl (_LONG_DOUBLE);
#endif /* __i386__ */
#endif /* !_LDBL_EQ_DBL && !__CYGWIN__ */

#endif /* __ISO_C_VISIBLE >= 1999 */

#if __MISC_VISIBLE
extern double drem (double, double);
extern float dremf (float, float);
#ifdef __CYGWIN__
extern float dreml (long double, long double);
#endif /* __CYGWIN__ */
extern double gamma_r (double, int *);
extern double lgamma_r (double, int *);
extern float gammaf_r (float, int *);
extern float lgammaf_r (float, int *);
#endif

#if __MISC_VISIBLE || __XSI_VISIBLE
extern double y0 (double);
extern double y1 (double);
extern double yn (int, double);
extern double j0 (double);
extern double j1 (double);
extern double jn (int, double);
#endif

#if __MISC_VISIBLE || __XSI_VISIBLE >= 600
extern float y0f (float);
extern float y1f (float);
extern float ynf (int, float);
extern float j0f (float);
extern float j1f (float);
extern float jnf (int, float);
#endif

/* GNU extensions */
#if __GNU_VISIBLE
extern void sincos (double, double *, double *);
extern void sincosf (float, float *, float *);
#ifdef __CYGWIN__
extern void sincosl (long double, long double *, long double *);
#endif /* __CYGWIN__ */
# ifndef exp10
extern double exp10 (double);
# endif
# ifndef pow10
extern double pow10 (double);
# endif
# ifndef exp10f
extern float exp10f (float);
# endif
# ifndef pow10f
extern float pow10f (float);
# endif
#ifdef __CYGWIN__
# ifndef exp10l
extern float exp10l (float);
# endif
# ifndef pow10l
extern float pow10l (float);
# endif
#endif /* __CYGWIN__ */
#endif /* __GNU_VISIBLE */

#if __MISC_VISIBLE || __XSI_VISIBLE
/* The gamma functions use a global variable, signgam.  */
#ifndef _REENT_ONLY
#define signgam (*__signgam())
extern int *__signgam (void);
#endif /* ! defined (_REENT_ONLY) */

#define __signgam_r(ptr) _REENT_SIGNGAM(ptr)
#endif /* __MISC_VISIBLE || __XSI_VISIBLE */

#if __SVID_VISIBLE
/* The exception structure passed to the matherr routine.  */
/* We have a problem when using C++ since `exception' is a reserved
   name in C++.  */
#ifdef __cplusplus
struct __exception
#else
struct exception
#endif
{
  int type;
  char *name;
  double arg1;
  double arg2;
  double retval;
  int err;
};

#ifdef __cplusplus
extern int matherr (struct __exception *e);
#else
extern int matherr (struct exception *e);
#endif

/* Values for the type field of struct exception.  */

#define DOMAIN 1
#define SING 2
#define OVERFLOW 3
#define UNDERFLOW 4
#define TLOSS 5
#define PLOSS 6

#endif /* __SVID_VISIBLE */

/* Useful constants.  */

#if __BSD_VISIBLE || __XSI_VISIBLE

#define MAXFLOAT	3.40282347e+38F

#define M_E		2.7182818284590452354
#define M_LOG2E		1.4426950408889634074
#define M_LOG10E	0.43429448190325182765
#define M_LN2		_M_LN2
#define M_LN10		2.30258509299404568402
#define M_PI		3.14159265358979323846
#define M_PI_2		1.57079632679489661923
#define M_PI_4		0.78539816339744830962
#define M_1_PI		0.31830988618379067154
#define M_2_PI		0.63661977236758134308
#define M_2_SQRTPI	1.12837916709551257390
#define M_SQRT2		1.41421356237309504880
#define M_SQRT1_2	0.70710678118654752440

#endif

#if __BSD_VISIBLE

#define M_TWOPI         (M_PI * 2.0)
#define M_3PI_4		2.3561944901923448370E0
#define M_SQRTPI        1.77245385090551602792981
#define M_LN2LO         1.9082149292705877000E-10
#define M_LN2HI         6.9314718036912381649E-1
#define M_SQRT3	1.73205080756887719000
#define M_IVLN10        0.43429448190325182765 /* 1 / log(10) */
#define M_LOG2_E        _M_LN2
#define M_INVLN2        1.4426950408889633870E0  /* 1 / log(2) */

/* Global control over fdlibm error handling.  */

enum __fdlibm_version
{
  __fdlibm_ieee = -1,
  __fdlibm_svid,
  __fdlibm_xopen,
  __fdlibm_posix
};

#define _LIB_VERSION_TYPE enum __fdlibm_version
#define _LIB_VERSION __fdlib_version

extern __IMPORT _LIB_VERSION_TYPE _LIB_VERSION;

#define _IEEE_  __fdlibm_ieee
#define _SVID_  __fdlibm_svid
#define _XOPEN_ __fdlibm_xopen
#define _POSIX_ __fdlibm_posix

#endif /* __BSD_VISIBLE */

_END_STD_C

#ifdef __FAST_MATH__
#include <machine/fastmath.h>
#endif

#endif /* _MATH_H_ */