sysdeps/m68k/bits/fenv.h

   1 /* Copyright (C) 1997-2019 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
  23 #if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
  24
  25 /* Define bits representing the exception.  We use the bit positions of
  26    the appropriate bits in the FPSR Accrued Exception Byte.  */
  27 enum
  28   {
  29     FE_INEXACT =
  30 # define FE_INEXACT     (1 << 3)
  31       FE_INEXACT,
  32     FE_DIVBYZERO =
  33 # define FE_DIVBYZERO   (1 << 4)
  34       FE_DIVBYZERO,
  35     FE_UNDERFLOW =
  36 # define FE_UNDERFLOW   (1 << 5)
  37       FE_UNDERFLOW,
  38     FE_OVERFLOW =
  39 # define FE_OVERFLOW    (1 << 6)
  40       FE_OVERFLOW,
  41     FE_INVALID =
  42 # define FE_INVALID     (1 << 7)
  43       FE_INVALID
  44   };
  45
  46 # define FE_ALL_EXCEPT \
  47         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  48
  49 /* The m68k FPU supports all of the four defined rounding modes.  We use
  50    the bit positions in the FPCR Mode Control Byte as the values for the
  51    appropriate macros.  */
  52 enum
  53   {
  54     FE_TONEAREST =
  55 # define FE_TONEAREST   0
  56       FE_TONEAREST,
  57     FE_TOWARDZERO =
  58 # define FE_TOWARDZERO  (1 << 4)
  59       FE_TOWARDZERO,
  60     FE_DOWNWARD =
  61 # define FE_DOWNWARD    (2 << 4)
  62       FE_DOWNWARD,
  63     FE_UPWARD =
  64 # define FE_UPWARD      (3 << 4)
  65       FE_UPWARD
  66   };
  67
  68 #else
  69
  70 /* In the soft-float case, only rounding to nearest is supported, with
  71    no exceptions.  */
  72
  73 # define FE_ALL_EXCEPT 0
  74
  75 enum
  76   {
  77     __FE_UNDEFINED = -1,
  78
  79     FE_TONEAREST =
  80 # define FE_TONEAREST   0
  81       FE_TONEAREST
  82   };
  83
  84 #endif
  85
  86
  87 /* Type representing exception flags.  */
  88 typedef unsigned int fexcept_t;
  89
  90
  91 #if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
  92
  93 /* Type representing floating-point environment.  This structure
  94    corresponds to the layout of the block written by `fmovem'.  */
  95 typedef struct
  96   {
  97     unsigned int __control_register;
  98     unsigned int __status_register;
  99     unsigned int __instruction_address;
 100   }
 101 fenv_t;
 102
 103 #else
 104
 105 /* Keep ABI compatibility with the type used in the generic
 106    bits/fenv.h, formerly used for no-FPU ColdFire.  */
 107 typedef struct
 108   {
 109     fexcept_t __excepts;
 110   }
 111 fenv_t;
 112
 113 #endif
 114
 115 /* If the default argument is used we use this value.  */
 116 #define FE_DFL_ENV      ((const fenv_t *) -1)
 117
 118 #if defined __USE_GNU && (defined __HAVE_68881__        \
 119                           || defined __HAVE_FPU__       \
 120                           || defined __mcffpu__)
 121 /* Floating-point environment where none of the exceptions are masked.  */
 122 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
 123 #endif
 124
 125 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
 126 /* Type representing floating-point control modes.  */
 127 typedef unsigned int femode_t;
 128
 129 /* Default floating-point control modes.  */
 130 # define FE_DFL_MODE    ((const femode_t *) -1L)
 131 #endif