This section defines global identifiers and their values that are associated with interfaces contained in libm.
These definitions are organized into groups that correspond to system headers. This convention is used as a convenience for the reader, and does not imply the existence of these headers, or their content.
These definitions are intended to supplement those provided in the referenced underlying specifications.
This specification uses ISO/IEC 9899 C Language as the reference programming language, and data definitions are specified in ISO C format. The C language is used here as a convenient notation. Using a C language description of these data objects does not preclude their use by other programming languages.
#define FE_INVALID 0x01
#define FE_DIVBYZERO 0x04
#define FE_OVERFLOW 0x08
#define FE_UNDERFLOW 0x10
#define FE_INEXACT 0x20
#define FE_ALL_EXCEPT (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
#define FE_TONEAREST 0
#define FE_DOWNWARD 0x400
#define FE_UPWARD 0x800
#define FE_TOWARDZERO 0xc00
typedef unsigned short fexcept_t;
typedef struct
{
unsigned short __control_word;
unsigned short __unused1;
unsigned short __status_word;
unsigned short __unused2;
unsigned short __tags;
unsigned short __unused3;
unsigned int __eip;
unsigned short __cs_selector;
unsigned int __opcode:11;
unsigned int __unused4:5;
unsigned int __data_offset;
unsigned short __data_selector;
unsigned short __unused5;
unsigned int __mxcsr;
}
fenv_t;
#define FE_DFL_ENV ((__const fenv_t *) -1) |
#define fpclassify(x) (sizeof (x) == sizeof (float) ? __fpclassifyf (x) :sizeof (x) == sizeof (double) ? __fpclassify (x) : __fpclassifyl (x))
#define signbit(x) (sizeof (x) == sizeof (float)? __signbitf (x): sizeof (x) == sizeof (double)? __signbit (x) : __signbitl (x))
#define FP_ILOGB0 -2147483648
#define FP_ILOGBNAN -2147483648 |