sysdeps/sh/sh4/fpu/bits/fenv.h

   1 /* Copyright (C) 1999-2012 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
  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 = 0x04,
  28 #define FE_INEXACT      FE_INEXACT
  29     FE_UNDERFLOW = 0x08,
  30 #define FE_UNDERFLOW    FE_UNDERFLOW
  31     FE_OVERFLOW = 0x10,
  32 #define FE_OVERFLOW     FE_OVERFLOW
  33     FE_DIVBYZERO = 0x20,
  34 #define FE_DIVBYZERO    FE_DIVBYZERO
  35     FE_INVALID = 0x40,
  36 #define FE_INVALID      FE_INVALID
  37   };
  38
  39 #define FE_ALL_EXCEPT \
  40         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  41
  42 /* The SH FPU supports two of the four defined rounding modes: round to nearest
  43    and round to zero.  We use again the bit positions in the FPU control word
  44    as the values for the appropriate macros.  */
  45 enum
  46   {
  47     __FE_UNDEFINED = -1,
  48
  49     FE_TONEAREST = 0x0,
  50 #define FE_TONEAREST    FE_TONEAREST
  51     FE_TOWARDZERO = 0x1,
  52 #define FE_TOWARDZERO   FE_TOWARDZERO
  53   };
  54
  55
  56 /* Type representing exception flags.  */
  57 typedef unsigned short int fexcept_t;
  58
  59
  60 /* Type representing floating-point environment.  This function corresponds
  61    to the layout of the block written by the `fstenv'.  */
  62 typedef struct
  63   {
  64     unsigned int __fpscr;
  65   }
  66 fenv_t;
  67
  68 /* If the default argument is used we use this value.  */
  69 #define FE_DFL_ENV      ((fenv_t *) -1)