1  /* Copyright (C) 1999-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef _FENV_H
      19  # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
      20  #endif
      21  
      22  
      23  /* Define bits representing the exception.  We use the bit positions of
      24     the appropriate bits in the FPSR...  (Tahoe EAS 2.4 5-4)*/
      25  
      26  enum
      27    {
      28      FE_INEXACT =
      29  #define FE_INEXACT	(1 << 5)
      30        FE_INEXACT,
      31  
      32      FE_UNDERFLOW =
      33  #define FE_UNDERFLOW	(1 << 4)
      34        FE_UNDERFLOW,
      35  
      36      FE_OVERFLOW =
      37  #define FE_OVERFLOW	(1 << 3)
      38        FE_OVERFLOW,
      39  
      40      FE_DIVBYZERO =
      41  #define FE_DIVBYZERO	(1 << 2)
      42        FE_DIVBYZERO,
      43  
      44      FE_UNNORMAL =
      45  #define FE_UNNORMAL	(1 << 1)
      46        FE_UNNORMAL,
      47  
      48      FE_INVALID =
      49  #define FE_INVALID	(1 << 0)
      50        FE_INVALID,
      51  
      52      FE_ALL_EXCEPT =
      53  #define FE_ALL_EXCEPT	(FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | FE_DIVBYZERO | FE_UNNORMAL | FE_INVALID)
      54        FE_ALL_EXCEPT
      55    };
      56  
      57  
      58  enum
      59    {
      60      FE_TOWARDZERO =
      61  #define FE_TOWARDZERO	3
      62        FE_TOWARDZERO,
      63  
      64      FE_UPWARD =
      65  #define FE_UPWARD	2
      66        FE_UPWARD,
      67  
      68      FE_DOWNWARD =
      69  #define FE_DOWNWARD	1
      70        FE_DOWNWARD,
      71  
      72      FE_TONEAREST =
      73  #define FE_TONEAREST	0
      74        FE_TONEAREST,
      75    };
      76  
      77  
      78  /* Type representing exception flags.  */
      79  typedef unsigned long int fexcept_t;
      80  
      81  /* Type representing floating-point environment.  */
      82  typedef unsigned long int fenv_t;
      83  
      84  /* If the default argument is used we use this value.  */
      85  #define FE_DFL_ENV	((const fenv_t *) 0xc009804c0270033fUL)
      86  
      87  #ifdef __USE_GNU
      88  /* Floating-point environment where only FE_UNNORMAL is masked since this
      89     exception is not generally supported by glibc.  */
      90  # define FE_NOMASK_ENV	((const fenv_t *) 0xc009804c02700302UL)
      91  
      92  /* Floating-point environment with (processor-dependent) non-IEEE
      93     floating point.  In this case, turning on flush-to-zero mode for
      94     s0, s2, and s3.  */
      95  # define FE_NONIEEE_ENV ((const fenv_t *) 0xc009a04d0270037fUL)
      96  #endif
      97  
      98  #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
      99  /* Type representing floating-point control modes.  */
     100  typedef unsigned long int femode_t;
     101  
     102  /* Default floating-point control modes.  */
     103  # define FE_DFL_MODE	((const femode_t *) 0xc009804c0270033fUL)
     104  #endif