46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
/****************************************************************
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*
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* fenv.h - floating-point environment access
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*
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* February 2021
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* Stephen Heumann
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*
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****************************************************************/
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#ifndef __fenv__
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#define __fenv__
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typedef unsigned short fenv_t;
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typedef unsigned short fexcept_t;
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/* Floating-point exceptions */
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#define FE_INVALID 0x01
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#define FE_UNDERFLOW 0x02
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#define FE_OVERFLOW 0x04
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#define FE_DIVBYZERO 0x08
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#define FE_INEXACT 0x10
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#define FE_ALL_EXCEPT 0x1F
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/* Rounding directions */
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#define FE_DOWNWARD 0x80
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#define FE_TONEAREST 0x00
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#define FE_TOWARDZERO 0xC0
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#define FE_UPWARD 0x40
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extern const fenv_t __FE_DFL_ENV[1];
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#define FE_DFL_ENV (&*__FE_DFL_ENV)
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int feclearexcept(int);
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int fegetexceptflag(fexcept_t *, int);
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int feraiseexcept(int);
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int fesetexceptflag(const fexcept_t *, int);
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int fetestexcept(int);
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int fegetround(void);
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int fesetround(int);
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int fegetenv(fenv_t *);
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int feholdexcept(fenv_t *);
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int fesetenv(const fenv_t *);
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int feupdateenv(const fenv_t *);
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#endif
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