sysdeps/m68k/fpu/bits/fenv.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000, 2012 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    <http://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 /* Define bits representing the exception.  We use the bit positions of
  24    the appropriate bits in the FPSR Accrued Exception Byte.  */
  25 enum
  26   {
  27     FE_INEXACT = 1 << 3,
  28 #define FE_INEXACT      FE_INEXACT
  29     FE_DIVBYZERO = 1 << 4,
  30 #define FE_DIVBYZERO    FE_DIVBYZERO
  31     FE_UNDERFLOW = 1 << 5,
  32 #define FE_UNDERFLOW    FE_UNDERFLOW
  33     FE_OVERFLOW = 1 << 6,
  34 #define FE_OVERFLOW     FE_OVERFLOW
  35     FE_INVALID = 1 << 7
  36 #define FE_INVALID      FE_INVALID
  37   };
  38
  39 #define FE_ALL_EXCEPT \
  40         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  41
  42 /* The m68k FPU supports all of the four defined rounding modes.  We use
  43    the bit positions in the FPCR Mode Control Byte as the values for the
  44    appropriate macros.  */
  45 enum
  46   {
  47     FE_TONEAREST = 0,
  48 #define FE_TONEAREST    FE_TONEAREST
  49     FE_TOWARDZERO = 1 << 4,
  50 #define FE_TOWARDZERO   FE_TOWARDZERO
  51     FE_DOWNWARD = 2 << 4,
  52 #define FE_DOWNWARD     FE_DOWNWARD
  53     FE_UPWARD = 3 << 4
  54 #define FE_UPWARD       FE_UPWARD
  55   };
  56
  57
  58 /* Type representing exception flags.  */
  59 typedef unsigned int fexcept_t;
  60
  61
  62 /* Type representing floating-point environment.  This structure
  63    corresponds to the layout of the block written by `fmovem'.  */
  64 typedef struct
  65   {
  66     unsigned int __control_register;
  67     unsigned int __status_register;
  68     unsigned int __instruction_address;
  69   }
  70 fenv_t;
  71
  72 /* If the default argument is used we use this value.  */
  73 #define FE_DFL_ENV      ((const fenv_t *) -1)
  74
  75 #ifdef __USE_GNU
  76 /* Floating-point environment where none of the exceptions are masked.  */
  77 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  78 #endif