sysdeps/arm/bits/fenv.h

   1 /* Copyright (C) 2004, 2005, 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 /* Define bits representing exceptions in the FPU status word.  */
  23 enum
  24   {
  25     FE_INVALID = 1,
  26 #define FE_INVALID FE_INVALID
  27     FE_DIVBYZERO = 2,
  28 #define FE_DIVBYZERO FE_DIVBYZERO
  29     FE_OVERFLOW = 4,
  30 #define FE_OVERFLOW FE_OVERFLOW
  31     FE_UNDERFLOW = 8,
  32 #define FE_UNDERFLOW FE_UNDERFLOW
  33     FE_INEXACT = 16,
  34 #define FE_INEXACT FE_INEXACT
  35   };
  36
  37 /* Amount to shift by to convert an exception to a mask bit.  */
  38 #define FE_EXCEPT_SHIFT 8
  39
  40 /* All supported exceptions.  */
  41 #define FE_ALL_EXCEPT   \
  42         (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
  43
  44 /* VFP supports all of the four defined rounding modes.  */
  45 enum
  46   {
  47     FE_TONEAREST = 0,
  48 #define FE_TONEAREST FE_TONEAREST
  49     FE_UPWARD = 0x400000,
  50 #define FE_UPWARD FE_UPWARD
  51     FE_DOWNWARD = 0x800000,
  52 #define FE_DOWNWARD FE_DOWNWARD
  53     FE_TOWARDZERO = 0xc00000
  54 #define FE_TOWARDZERO FE_TOWARDZERO
  55   };
  56
  57 /* Type representing exception flags. */
  58 typedef unsigned int fexcept_t;
  59
  60 /* Type representing floating-point environment.  */
  61 typedef struct
  62   {
  63     unsigned int __cw;
  64   }
  65 fenv_t;
  66
  67 /* If the default argument is used we use this value.  */
  68 #define FE_DFL_ENV      ((fenv_t *) -1l)
  69
  70 #ifdef __USE_GNU
  71 /* Floating-point environment where none of the exceptions are masked.  */
  72 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  73 #endif