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fenv.h (2979B) - Raw

      1 /* Floating point environment.  C-SKY version.
      2    Copyright (C) 2018-2025 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_C23)
    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