uclibc-ng/libc/sysdeps/linux/csky/bits/fenv.h

/*
 * Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd.
 *
 * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
 * in this tarball.
 */

#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif

/* Define bits representing the exception.  We use the bit positions of
   the appropriate bits in the FPSR Accrued Exception Byte.  */
enum
  {
    FE_INEXACT = 1 << 3,
#define FE_INEXACT	FE_INEXACT
    FE_DIVBYZERO = 1 << 4,
#define FE_DIVBYZERO	FE_DIVBYZERO
    FE_UNDERFLOW = 1 << 5,
#define FE_UNDERFLOW	FE_UNDERFLOW
    FE_OVERFLOW = 1 << 6,
#define FE_OVERFLOW	FE_OVERFLOW
    FE_INVALID = 1 << 7
#define FE_INVALID	FE_INVALID
  };

#define FE_ALL_EXCEPT \
	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

/* The csky FPU supports all of the four defined rounding modes.  We use
   the bit positions in the FPCR Mode Control Byte as the values for the
   appropriate macros.  */
enum
  {
    FE_TONEAREST = 0,
#define FE_TONEAREST	FE_TONEAREST
    FE_TOWARDZERO = 1 << 4,
#define FE_TOWARDZERO	FE_TOWARDZERO
    FE_DOWNWARD = 2 << 4,
#define FE_DOWNWARD	FE_DOWNWARD
    FE_UPWARD = 3 << 4
#define FE_UPWARD	FE_UPWARD
  };

/* Type representing exception flags.  */
typedef unsigned int fexcept_t;

/* Type representing floating-point environment.  This structure
   corresponds to the layout of the block written by `fmovem'.  */
typedef struct
  {
    unsigned int __control_register;
    unsigned int __status_register;
    unsigned int __instruction_address;
  }
fenv_t;

/* If the default argument is used we use this value.  */
#define FE_DFL_ENV	((__const fenv_t *) -1)

#ifdef __USE_GNU
/* Floating-point environment where none of the exceptions are masked.  */
# define FE_NOMASK_ENV	((__const fenv_t *) -2)
#endif