1  /* Floating point environment.  C-SKY version.
       2     Copyright (C) 2018-2023 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  #ifdef __csky_hard_float__
      24  /* Define bits representing the exception.  We use the bit positions
      25     of the appropriate bits in the FPU control word.  */
      26  enum
      27    {
      28      FE_INVALID =
      29  #define FE_INVALID	0x01
      30        FE_INVALID,
      31      FE_DIVBYZERO =
      32  #define FE_DIVBYZERO	0x02
      33        FE_DIVBYZERO,
      34      FE_OVERFLOW =
      35  #define FE_OVERFLOW	0x04
      36        FE_OVERFLOW,
      37      FE_UNDERFLOW =
      38  #define FE_UNDERFLOW	0x08
      39        FE_UNDERFLOW,
      40      FE_INEXACT =
      41  #define FE_INEXACT	0x10
      42        FE_INEXACT,
      43      __FE_DENORMAL = 0x20
      44    };
      45  
      46  #define FE_ALL_EXCEPT \
      47  	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
      48  
      49  /* The C-SKY FPU supports all of the four defined rounding modes.  We
      50     use again the bit positions in the FPU control word as the values
      51     for the appropriate macros.  */
      52  enum
      53    {
      54      FE_TONEAREST =
      55  #define FE_TONEAREST	(0x0 << 24)
      56        FE_TONEAREST,
      57      FE_TOWARDZERO =
      58  #define FE_TOWARDZERO	(0x1 << 24)
      59        FE_TOWARDZERO,
      60      FE_UPWARD =
      61  #define FE_UPWARD	(0x2 << 24)
      62        FE_UPWARD,
      63      FE_DOWNWARD =
      64  #define FE_DOWNWARD	(0x3 << 24)
      65        FE_DOWNWARD,
      66      __FE_ROUND_MASK = (0x3 << 24)
      67    };
      68  
      69  #else
      70  
      71  /* In the soft-float case, only rounding to nearest is supported, with
      72     no exceptions.  */
      73  
      74  enum
      75    {
      76      __FE_UNDEFINED = -1,
      77  
      78      FE_TONEAREST =
      79  # define FE_TONEAREST	0x0
      80        FE_TONEAREST
      81    };
      82  
      83  # define FE_ALL_EXCEPT 0
      84  
      85  #endif
      86  
      87  /* Type representing exception flags.  */
      88  typedef unsigned int fexcept_t;
      89  
      90  /* Type representing floating-point environment.  */
      91  typedef struct
      92  {
      93    unsigned int __fpcr;
      94    unsigned int __fpsr;
      95  } fenv_t;
      96  
      97  /* If the default argument is used we use this value.  */
      98  #define FE_DFL_ENV	((const fenv_t *) -1)
      99  
     100  #if defined __USE_GNU && defined __csky_hard_float__
     101  /* Floating-point environment where none of the exceptions are masked.  */
     102  # define FE_NOMASK_ENV	((const fenv_t *) -2)
     103  #endif
     104  
     105  #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
     106  /* Type representing floating-point control modes.  */
     107  typedef unsigned int femode_t;
     108  
     109  /* Default floating-point control modes.  */
     110  # define FE_DFL_MODE	((const femode_t *) -1L)
     111  #endif