sysdeps/mips/bits/fenv.h

   1 /* Copyright (C) 1998-2015 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
  23 /* Define bits representing the exception.  We use the bit positions
  24    of the appropriate bits in the FPU control word.  */
  25 enum
  26   {
  27     FE_INEXACT =
  28 #define FE_INEXACT      0x04
  29       FE_INEXACT,
  30     FE_UNDERFLOW =
  31 #define FE_UNDERFLOW    0x08
  32       FE_UNDERFLOW,
  33     FE_OVERFLOW =
  34 #define FE_OVERFLOW     0x10
  35       FE_OVERFLOW,
  36     FE_DIVBYZERO =
  37 #define FE_DIVBYZERO    0x20
  38       FE_DIVBYZERO,
  39     FE_INVALID =
  40 #define FE_INVALID      0x40
  41       FE_INVALID,
  42   };
  43
  44 #define FE_ALL_EXCEPT \
  45         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  46
  47 /* The MIPS FPU supports all of the four defined rounding modes.  We
  48    use again the bit positions in the FPU control word as the values
  49    for the appropriate macros.  */
  50 enum
  51   {
  52     FE_TONEAREST =
  53 #define FE_TONEAREST    0x0
  54       FE_TONEAREST,
  55     FE_TOWARDZERO =
  56 #define FE_TOWARDZERO   0x1
  57       FE_TOWARDZERO,
  58     FE_UPWARD =
  59 #define FE_UPWARD       0x2
  60       FE_UPWARD,
  61     FE_DOWNWARD =
  62 #define FE_DOWNWARD     0x3
  63       FE_DOWNWARD
  64   };
  65
  66
  67 /* Type representing exception flags.  */
  68 typedef unsigned short int fexcept_t;
  69
  70
  71 /* Type representing floating-point environment.  This function corresponds
  72    to the layout of the block written by the `fstenv'.  */
  73 typedef struct
  74   {
  75     unsigned int __fp_control_register;
  76   }
  77 fenv_t;
  78
  79 /* If the default argument is used we use this value.  */
  80 #define FE_DFL_ENV      ((const fenv_t *) -1)
  81
  82 #ifdef __USE_GNU
  83 /* Floating-point environment where none of the exception is masked.  */
  84 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  85 #endif