sysdeps/csky/bits/fenv.h

   1 /* Floating point environment.  C-SKY version.
   2    Copyright (C) 2018-2019 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