sysdeps/am33/fpu/bits/fenv.h

   1 /* Copyright (C) 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Alexandre Oliva <aoliva@redhat.com>
   4    based on the corresponding file in the mips port.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _FENV_H
  21 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  22 #endif
  23
  24
  25 /* Define bits representing the exception.  We use the EF bit
  26    positions of the appropriate bits in the FPCR register.  */
  27 enum
  28   {
  29     FE_INEXACT = 0x01,
  30 #define FE_INEXACT      FE_INEXACT
  31     FE_UNDERFLOW = 0x02,
  32 #define FE_UNDERFLOW    FE_UNDERFLOW
  33     FE_OVERFLOW = 0x04,
  34 #define FE_OVERFLOW     FE_OVERFLOW
  35     FE_DIVBYZERO = 0x08,
  36 #define FE_DIVBYZERO    FE_DIVBYZERO
  37     FE_INVALID = 0x10,
  38 #define FE_INVALID      FE_INVALID
  39   };
  40
  41 #define FE_ALL_EXCEPT \
  42         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  43
  44 /* The AM33/2.0 FPU supports only Round to nearest.  Bits 3<<16 are
  45    reserved to represent other rounding modes.  */
  46 enum
  47   {
  48     FE_TONEAREST = 0x00000,
  49 #define FE_TONEAREST    FE_TONEAREST
  50   };
  51
  52
  53 /* Type representing exception flags.  */
  54 typedef unsigned int fexcept_t;
  55
  56
  57 /* Type representing floating-point environment.  */
  58 typedef unsigned int fenv_t;
  59
  60 /* If the default argument is used we use this value.  */
  61 #define FE_DFL_ENV      ((__const fenv_t *) -1)
  62
  63 #ifdef __USE_GNU
  64 /* Floating-point environment where none of the exception is masked.  */
  65 # define FE_NOMASK_ENV  ((__const fenv_t *) -2)
  66 #endif