/* Copyright (C) 1997,1998,1999,2000,2001,2004 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; 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#include <bits/wordsize.h>/* Define bits representing the exception.  We use the bit positions   of the appropriate bits in the FPU control word.  */enum  {    FE_INVALID = 0x01,#define FE_INVALID	FE_INVALID    __FE_DENORM = 0x02,    FE_DIVBYZERO = 0x04,#define FE_DIVBYZERO	FE_DIVBYZERO    FE_OVERFLOW = 0x08,#define FE_OVERFLOW	FE_OVERFLOW    FE_UNDERFLOW = 0x10,#define FE_UNDERFLOW	FE_UNDERFLOW    FE_INEXACT = 0x20#define FE_INEXACT	FE_INEXACT  };#define FE_ALL_EXCEPT \	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)/* The ix87 FPU supports all of the four defined rounding modes.  We   use again the bit positions in the FPU control word as the values   for the appropriate macros.  */enum  {    FE_TONEAREST = 0,#define FE_TONEAREST	FE_TONEAREST    FE_DOWNWARD = 0x400,#define FE_DOWNWARD	FE_DOWNWARD    FE_UPWARD = 0x800,#define FE_UPWARD	FE_UPWARD    FE_TOWARDZERO = 0xc00#define FE_TOWARDZERO	FE_TOWARDZERO  };/* Type representing exception flags.  */typedef unsigned short int fexcept_t;/* Type representing floating-point environment.  This structure   corresponds to the layout of the block written by the `fstenv'   instruction and has additional fields for the contents of the MXCSR   register as written by the `stmxcsr' instruction.  */typedef struct  {    unsigned short int __control_word;    unsigned short int __unused1;    unsigned short int __status_word;    unsigned short int __unused2;    unsigned short int __tags;    unsigned short int __unused3;    unsigned int __eip;    unsigned short int __cs_selector;    unsigned int __opcode:11;    unsigned int __unused4:5;    unsigned int __data_offset;    unsigned short int __data_selector;    unsigned short int __unused5;#if __WORDSIZE == 64    unsigned int __mxcsr;#endif  }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 exception is masked.  */# define FE_NOMASK_ENV	((__const fenv_t *) -2)#endif