glibc/sysdeps/s390/fpu/bits/fenv.h

/* Copyright (C) 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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 FPU control word.  */
enum
  {
    FE_INVALID = 0x80,
#define FE_INVALID	FE_INVALID
    FE_DIVBYZERO = 0x40,
#define FE_DIVBYZERO	FE_DIVBYZERO
    FE_OVERFLOW = 0x20,
#define FE_OVERFLOW	FE_OVERFLOW
    FE_UNDERFLOW = 0x10,
#define FE_UNDERFLOW	FE_UNDERFLOW
    FE_INEXACT = 0x08
#define FE_INEXACT	FE_INEXACT
  };
/* We dont use the y bit of the DXC in the floating point control register
 * as glibc has no FE encoding for fe inexact incremented
 * or fe inexact truncated.
 * We currently  use the flag bits in the fpc
 * as these are sticky for feholdenv & feupdatenv as it is defined
 * in the HP Manpages.
 */


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

enum
  {
    FE_TONEAREST = 0,
#define FE_TONEAREST	FE_TONEAREST
    FE_DOWNWARD = 0x3,
#define FE_DOWNWARD	FE_DOWNWARD
    FE_UPWARD = 0x2,
#define FE_UPWARD	FE_UPWARD
    FE_TOWARDZERO = 0x1
#define FE_TOWARDZERO	FE_TOWARDZERO
  };


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


/* Type representing floating-point environment.  This function corresponds
   to the layout of the block written by the `fstenv'.  */
typedef struct
{
	fexcept_t fpc;
	void *ieee_instruction_pointer;
	/* failing instruction for ieee exceptions */
} fenv_t;

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

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