sysdeps/arm/fpu/bits/fenv.h

   1 /* Copyright (C) 1997, 1998, 1999 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 /* Define bits representing exceptions in the FPU status word.  */
  24 enum
  25   {
  26     FE_INVALID = 1,
  27 #define FE_INVALID FE_INVALID
  28     FE_DIVBYZERO = 2,
  29 #define FE_DIVBYZERO FE_DIVBYZERO
  30     FE_OVERFLOW = 4,
  31 #define FE_OVERFLOW FE_OVERFLOW
  32     FE_UNDERFLOW = 8,
  33 #define FE_UNDERFLOW FE_UNDERFLOW
  34   };
  35
  36 /* Amount to shift by to convert an exception to a mask bit.  */
  37 #define FE_EXCEPT_SHIFT 16
  38
  39 /* All supported exceptions.  */
  40 #define FE_ALL_EXCEPT   \
  41         (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
  42
  43 /* The ARM FPU basically only supports round-to-nearest.  Other rounding
  44    modes exist, but you have to encode them in the actual instruction.  */
  45 #define FE_TONEAREST    0
  46
  47 /* Type representing exception flags. */
  48 typedef unsigned long int fexcept_t;
  49
  50 /* Type representing floating-point environment.  */
  51 typedef struct
  52   {
  53     unsigned long int __cw;
  54   }
  55 fenv_t;
  56
  57 /* If the default argument is used we use this value.  */
  58 #define FE_DFL_ENV      ((fenv_t *) -1l)