ports/sysdeps/arm/bits/fenv.h

   1 /* Copyright (C) 2004-2014 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 /* Define bits representing exceptions in the FPU status word.  */
  23 enum
  24   {
  25     FE_INVALID =
  26 #define FE_INVALID      1
  27       FE_INVALID,
  28     FE_DIVBYZERO =
  29 #define FE_DIVBYZERO    2
  30       FE_DIVBYZERO,
  31     FE_OVERFLOW =
  32 #define FE_OVERFLOW     4
  33       FE_OVERFLOW,
  34     FE_UNDERFLOW =
  35 #define FE_UNDERFLOW    8
  36       FE_UNDERFLOW,
  37     FE_INEXACT =
  38 #define FE_INEXACT      16
  39       FE_INEXACT,
  40   };
  41
  42 /* Amount to shift by to convert an exception to a mask bit.  */
  43 #define FE_EXCEPT_SHIFT 8
  44
  45 /* All supported exceptions.  */
  46 #define FE_ALL_EXCEPT   \
  47         (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
  48
  49 /* VFP supports all of the four defined rounding modes.  */
  50 enum
  51   {
  52     FE_TONEAREST =
  53 #define FE_TONEAREST    0
  54       FE_TONEAREST,
  55     FE_UPWARD =
  56 #define FE_UPWARD       0x400000
  57       FE_UPWARD,
  58     FE_DOWNWARD =
  59 #define FE_DOWNWARD     0x800000
  60       FE_DOWNWARD,
  61     FE_TOWARDZERO =
  62 #define FE_TOWARDZERO   0xc00000
  63       FE_TOWARDZERO
  64   };
  65
  66 /* Type representing exception flags. */
  67 typedef unsigned int fexcept_t;
  68
  69 /* Type representing floating-point environment.  */
  70 typedef struct
  71   {
  72     unsigned int __cw;
  73   }
  74 fenv_t;
  75
  76 /* If the default argument is used we use this value.  */
  77 #define FE_DFL_ENV      ((const fenv_t *) -1l)
  78
  79 #ifdef __USE_GNU
  80 /* Floating-point environment where none of the exceptions are masked.  */
  81 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  82 #endif