1  /* Copyright (C) 2004-2023 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  /* Define bits representing exceptions in the FPU status word.  */
      23  enum
      24    {
      25      FE_INVALID =
      26  #define FE_INVALID	1
      27        FE_INVALID,
      28      FE_DIVBYZERO =
      29  #define FE_DIVBYZERO	2
      30        FE_DIVBYZERO,
      31      FE_OVERFLOW =
      32  #define FE_OVERFLOW	4
      33        FE_OVERFLOW,
      34      FE_UNDERFLOW =
      35  #define FE_UNDERFLOW	8
      36        FE_UNDERFLOW,
      37      FE_INEXACT =
      38  #define FE_INEXACT	16
      39        FE_INEXACT,
      40    };
      41  
      42  /* Amount to shift by to convert an exception to a mask bit.  */
      43  #define FE_EXCEPT_SHIFT	8
      44  
      45  /* All supported exceptions.  */
      46  #define FE_ALL_EXCEPT	\
      47  	(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
      48  
      49  /* VFP supports all of the four defined rounding modes.  */
      50  enum
      51    {
      52      FE_TONEAREST =
      53  #define FE_TONEAREST	0
      54        FE_TONEAREST,
      55      FE_UPWARD =
      56  #define FE_UPWARD	0x400000
      57        FE_UPWARD,
      58      FE_DOWNWARD =
      59  #define FE_DOWNWARD	0x800000
      60        FE_DOWNWARD,
      61      FE_TOWARDZERO =
      62  #define FE_TOWARDZERO	0xc00000
      63        FE_TOWARDZERO
      64    };
      65  
      66  /* Type representing exception flags. */
      67  typedef unsigned int fexcept_t;
      68  
      69  /* Type representing floating-point environment.  */
      70  typedef struct
      71    {
      72      unsigned int __cw;
      73    }
      74  fenv_t;
      75  
      76  /* If the default argument is used we use this value.  */
      77  #define FE_DFL_ENV	((const fenv_t *) -1l)
      78  
      79  #ifdef __USE_GNU
      80  /* Floating-point environment where none of the exceptions are masked.  */
      81  # define FE_NOMASK_ENV  ((const fenv_t *) -2)
      82  #endif
      83  
      84  #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
      85  /* Type representing floating-point control modes.  */
      86  typedef unsigned int femode_t;
      87  
      88  /* Default floating-point control modes.  */
      89  # define FE_DFL_MODE	((const femode_t *) -1L)
      90  #endif