sysdeps/sh/bits/fenv.h

   1 /* Copyright (C) 1999-2014 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
  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 SH FPU supports two of the four defined rounding modes: round to nearest
  48    and round to zero.  We use again the bit positions in the FPU control word
  49    as the values for the appropriate macros.  */
  50 enum
  51   {
  52     __FE_UNDEFINED = -1,
  53
  54     FE_TONEAREST =
  55 #define FE_TONEAREST    0x0
  56       FE_TONEAREST,
  57     FE_TOWARDZERO =
  58 #define FE_TOWARDZERO   0x1
  59       FE_TOWARDZERO,
  60   };
  61
  62
  63 /* Type representing exception flags.  */
  64 typedef unsigned short int fexcept_t;
  65
  66
  67 /* Type representing floating-point environment.  This function corresponds
  68    to the layout of the block written by the `fstenv'.  */
  69 typedef struct
  70   {
  71     unsigned int __fpscr;
  72   }
  73 fenv_t;
  74
  75 /* If the default argument is used we use this value.  */
  76 #define FE_DFL_ENV      ((const fenv_t *) -1)