ports/sysdeps/m68k/fpu/bits/fenv.h

   1 /* Copyright (C) 1997-2014 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 =
  28 #define FE_INEXACT      (1 << 3)
  29       FE_INEXACT,
  30     FE_DIVBYZERO =
  31 #define FE_DIVBYZERO    (1 << 4)
  32       FE_DIVBYZERO,
  33     FE_UNDERFLOW =
  34 #define FE_UNDERFLOW    (1 << 5)
  35       FE_UNDERFLOW,
  36     FE_OVERFLOW =
  37 #define FE_OVERFLOW     (1 << 6)
  38       FE_OVERFLOW,
  39     FE_INVALID =
  40 #define FE_INVALID      (1 << 7)
  41       FE_INVALID
  42   };
  43
  44 #define FE_ALL_EXCEPT \
  45         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  46
  47 /* The m68k FPU supports all of the four defined rounding modes.  We use
  48    the bit positions in the FPCR Mode Control Byte as the values for the
  49    appropriate macros.  */
  50 enum
  51   {
  52     FE_TONEAREST =
  53 #define FE_TONEAREST    0
  54       FE_TONEAREST,
  55     FE_TOWARDZERO =
  56 #define FE_TOWARDZERO   (1 << 4)
  57       FE_TOWARDZERO,
  58     FE_DOWNWARD =
  59 #define FE_DOWNWARD     (2 << 4)
  60       FE_DOWNWARD,
  61     FE_UPWARD =
  62 #define FE_UPWARD       (3 << 4)
  63       FE_UPWARD
  64   };
  65
  66
  67 /* Type representing exception flags.  */
  68 typedef unsigned int fexcept_t;
  69
  70
  71 /* Type representing floating-point environment.  This structure
  72    corresponds to the layout of the block written by `fmovem'.  */
  73 typedef struct
  74   {
  75     unsigned int __control_register;
  76     unsigned int __status_register;
  77     unsigned int __instruction_address;
  78   }
  79 fenv_t;
  80
  81 /* If the default argument is used we use this value.  */
  82 #define FE_DFL_ENV      ((const fenv_t *) -1)
  83
  84 #ifdef __USE_GNU
  85 /* Floating-point environment where none of the exceptions are masked.  */
  86 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  87 #endif