sysdeps/m68k/fpu/bits/fenv.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _FENV_H
  20 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  21 #endif
  22
  23
  24 /* Define bits representing the exception.  We use the bit positions of
  25    the appropriate bits in the FPSR Accrued Exception Byte.  */
  26 enum
  27   {
  28     FE_INEXACT = 1 << 3,
  29 #define FE_INEXACT      FE_INEXACT
  30     FE_DIVBYZERO = 1 << 4,
  31 #define FE_DIVBYZERO    FE_DIVBYZERO
  32     FE_UNDERFLOW = 1 << 5,
  33 #define FE_UNDERFLOW    FE_UNDERFLOW
  34     FE_OVERFLOW = 1 << 6,
  35 #define FE_OVERFLOW     FE_OVERFLOW
  36     FE_INVALID = 1 << 7
  37 #define FE_INVALID      FE_INVALID
  38   };
  39
  40 #define FE_ALL_EXCEPT \
  41         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  42
  43 /* The m68k FPU supports all of the four defined rounding modes.  We use
  44    the bit positions in the FPCR Mode Control Byte as the values for the
  45    appropriate macros.  */
  46 enum
  47   {
  48     FE_TONEAREST = 0,
  49 #define FE_TONEAREST    FE_TONEAREST
  50     FE_TOWARDZERO = 1 << 4,
  51 #define FE_TOWARDZERO   FE_TOWARDZERO
  52     FE_DOWNWARD = 2 << 4,
  53 #define FE_DOWNWARD     FE_DOWNWARD
  54     FE_UPWARD = 3 << 4
  55 #define FE_UPWARD       FE_UPWARD
  56   };
  57
  58
  59 /* Type representing exception flags.  */
  60 typedef unsigned int fexcept_t;
  61
  62
  63 /* Type representing floating-point environment.  This structure
  64    corresponds to the layout of the block written by `fmovem'.  */
  65 typedef struct
  66   {
  67     unsigned int __control_register;
  68     unsigned int __status_register;
  69     unsigned int __instruction_address;
  70   }
  71 fenv_t;
  72
  73 /* If the default argument is used we use this value.  */
  74 #define FE_DFL_ENV      ((__const fenv_t *) -1)
  75
  76 #ifdef __USE_GNU
  77 /* Floating-point environment where none of the exceptions are masked.  */
  78 # define FE_NOMASK_ENV  ((__const fenv_t *) -2)
  79 #endif