1  /* Floating point environment.
       2     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _FENV_H
      20  #error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
      21  #endif
      22  
      23  /* Define bits representing the exception.  We use the bit positions
      24     of the appropriate bits in the FPU control word.  */
      25  enum
      26  {
      27    FE_INEXACT =
      28  #define FE_INEXACT 0x010000
      29      FE_INEXACT,
      30    FE_UNDERFLOW =
      31  #define FE_UNDERFLOW 0x020000
      32      FE_UNDERFLOW,
      33    FE_OVERFLOW =
      34  #define FE_OVERFLOW 0x040000
      35      FE_OVERFLOW,
      36    FE_DIVBYZERO =
      37  #define FE_DIVBYZERO 0x080000
      38      FE_DIVBYZERO,
      39    FE_INVALID =
      40  #define FE_INVALID 0x100000
      41      FE_INVALID,
      42  };
      43  
      44  #define FE_ALL_EXCEPT \
      45    (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
      46  
      47  /* The LoongArch FPU supports all of the four defined rounding modes.  We
      48     use again the bit positions in the FPU control word as the values
      49     for the appropriate macros.  */
      50  enum
      51  {
      52    FE_TONEAREST =
      53  #define FE_TONEAREST 0x000
      54      FE_TONEAREST,
      55    FE_TOWARDZERO =
      56  #define FE_TOWARDZERO 0x100
      57      FE_TOWARDZERO,
      58    FE_UPWARD =
      59  #define FE_UPWARD 0x200
      60      FE_UPWARD,
      61    FE_DOWNWARD =
      62  #define FE_DOWNWARD 0x300
      63      FE_DOWNWARD
      64  };
      65  
      66  /* Type representing exception flags.  */
      67  typedef unsigned int fexcept_t;
      68  
      69  /* Type representing floating-point environment.  This function corresponds
      70     to the layout of the block written by the `fstenv'.  */
      71  typedef struct
      72  {
      73    unsigned int __fp_control_register;
      74  } fenv_t;
      75  
      76  /* If the default argument is used we use this value.  */
      77  #define FE_DFL_ENV ((const fenv_t *) -1)
      78  
      79  #ifdef __USE_GNU
      80  /* Floating-point environment where none of the exception is masked.  */
      81  #define FE_NOMASK_ENV ((const fenv_t *) -257)
      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