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#define FE_TONEAREST	0
#define FE_TOWARDZERO	1
#define FE_UPWARD	2
#define FE_DOWNWARD	3

#define FE_INEXACT	0x02000000
#define FE_DIVBYZERO	0x04000000
#define FE_UNDERFLOW	0x08000000
#define FE_OVERFLOW	0x10000000
#define FE_INVALID	0x20000000

#define FE_ALL_EXCEPT	0x3e000000

#ifdef _GNU_SOURCE
#define FE_INVALID_SNAN		0x01000000
#define FE_INVALID_ISI		0x00800000
#define FE_INVALID_IDI		0x00400000
#define FE_INVALID_ZDZ		0x00200000
#define FE_INVALID_IMZ		0x00100000
#define FE_INVALID_COMPARE	0x00080000
#define FE_INVALID_SOFTWARE	0x00000400
#define FE_INVALID_SQRT		0x00000200
#define FE_INVALID_INTEGER_CONVERSION	0x00000100

#define FE_ALL_INVALID		0x01f80700
#endif

typedef unsigned fexcept_t;
typedef double fenv_t;

#define FE_DFL_ENV ((const fenv_t *)-1)