arch/m68k-all/include/aros/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 #define _FENV_H 1
  21
  22 #include <aros/system.h>
  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
  80
  81 __BEGIN_DECLS
  82
  83 /* Floating-point exception handling.  */
  84
  85 /* Clear the supported exceptions represented by EXCEPTS.  */
  86 int feclearexcept (int __excepts);
  87
  88 /* Store implementation-defined representation of the exception flags
  89    indicated by EXCEPTS in the object pointed to by FLAGP.  */
  90 int fegetexceptflag (fexcept_t *__flagp, int __excepts);
  91
  92 /* Raise the supported exceptions represented by EXCEPTS.  */
  93 int feraiseexcept (int __excepts);
  94
  95 /* Set complete status for exceptions indicated by EXCEPTS according to
  96    the representation in the object pointed to by FLAGP.  */
  97 int fesetexceptflag(const fexcept_t *flagp, int excepts);
  98
  99 /* Determine which of subset of the exceptions specified by EXCEPTS are
 100    currently set.  */
 101 int fetestexcept (int __excepts);
 102
 103
 104 /* Rounding control.  */
 105
 106 /* Get current rounding direction.  */
 107 int fegetround (void);
 108
 109 /* Establish the rounding direction represented by ROUND.  */
 110 int fesetround (int __rounding_direction);
 111
 112
 113 /* Floating-point environment.  */
 114
 115 /* Store the current floating-point environment in the object pointed
 116    to by ENVP.  */
 117 int fegetenv (fenv_t *envp);
 118
 119 /* Save the current environment in the object pointed to by ENVP, clear
 120    exception flags and install a non-stop mode (if available) for all
 121    exceptions.  */
 122 int feholdexcept (fenv_t *envp);
 123
 124 /* Establish the floating-point environment represented by the object
 125    pointed to by ENVP.  */
 126 int fesetenv(const fenv_t *envp);
 127
 128 /* Save current exceptions in temporary storage, install environment
 129    represented by object pointed to by ENVP and raise exceptions
 130    according to saved exceptions.  */
 131 int feupdateenv(const fenv_t *envp);
 132
 133
 134 #ifdef __USE_GNU
 135
 136 /* Enable individual exceptions.  Will not enable more exceptions than
 137    EXCEPTS specifies.  Returns the previous enabled exceptions if all
 138    exceptions are successfully set, otherwise returns -1.  */
 139 int feenableexcept (int __excepts);
 140
 141 /* Disable individual exceptions.  Will not disable more exceptions than
 142    EXCEPTS specifies.  Returns the previous enabled exceptions if all
 143    exceptions are successfully disabled, otherwise returns -1.  */
 144 int fedisableexcept (int __excepts);
 145
 146 /* Return enabled exceptions.  */
 147 int fegetexcept (void);
 148 #endif
 149
 150 __END_DECLS
 151
 152 #endif /* fenv.h */
 153