libm.h File Reference

#include <stdint.h>
#include <float.h>
#include <math.h>

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Macros
#define	_STATIC_ASSERT(expr)   extern char (*__static_assert__(void)) [(expr) ? 1 : -1]
#define	isnan   _isnan
#define	isnanf   _isnanf
#define	signbit(x)
#define	FORCE_EVAL(x)

Functions
	_STATIC_ASSERT (sizeof(float)==4)
	_STATIC_ASSERT (sizeof(double)==8)
	_STATIC_ASSERT (sizeof(long double)==8)
_Check_return_ int __cdecl	_isnanf (_In_ float _X)
static __inline uint32_t	__FLOAT_BITS (float __f)
static __inline uint64_t	__DOUBLE_BITS (double __f)
static void	fp_force_evalf (float x)
static void	fp_force_eval (double x)

Macro Definition Documentation

_STATIC_ASSERT

#define _STATIC_ASSERT

(

expr

)

extern char (*__static_assert__(void)) [(expr) ? 1 : -1]

Definition at line 19 of file libm.h.

FORCE_EVAL

#define FORCE_EVAL

(

x

)

Value:

    do {                    \
    if (sizeof(x) == sizeof(float)) {         \
        fp_force_evalf(x);                    \
    } else {                                  \
        fp_force_eval(x);                     \
    }                                         \
} while(0)

Definition at line 64 of file libm.h.

isnan

#define isnan   _isnan

Definition at line 28 of file libm.h.

isnanf

#define isnanf   _isnanf

Definition at line 29 of file libm.h.

signbit

#define signbit

(

x

)

Value:

    ((sizeof(x) == sizeof(float)) ? (int)(__FLOAT_BITS(x)>>31) : \
                                    (int)(__DOUBLE_BITS(x)>>63))

Definition at line 46 of file libm.h.

Function Documentation

__DOUBLE_BITS()

static __inline uint64_t __DOUBLE_BITS ( double  __f )

static

Definition at line 39 of file libm.h.

{
    union {double __f; uint64_t __i;} __u;
    __u.__f = __f;
    return __u.__i;
}

__FLOAT_BITS()

static __inline uint32_t __FLOAT_BITS ( float  __f )

static

Definition at line 32 of file libm.h.

{
    union {float __f; uint32_t __i;} __u;
    __u.__f = __f;
    return __u.__i;
}

_isnanf()

_Check_return_ int __cdecl _isnanf

(

_In_ float

_X

)

Definition at line 13 of file _isnanf.c.

{
    union { float f; uint32_t ui32; } u = { _X };
    return (u.ui32 & ~0x80000000) > 0x7F800000;
}

Referenced by Test__isnanf().

_STATIC_ASSERT() [1/3]

_STATIC_ASSERT

(

sizeof(double)

= =8

)

_STATIC_ASSERT() [2/3]

_STATIC_ASSERT

(

sizeof(float)

= =4

)

_STATIC_ASSERT() [3/3]

_STATIC_ASSERT

(

sizeof(long double)

= =8

)

fp_force_eval()

static void fp_force_eval ( double  x )

inlinestatic

Definition at line 57 of file libm.h.

{
    volatile double y;
    y = x;
    (void)y;
}

fp_force_evalf()

static void fp_force_evalf ( float  x )

inlinestatic

Definition at line 50 of file libm.h.

{
    volatile float y;
    y = x;
    (void)y;
}