ports/sysdeps/aarch64/bits/fenv.h

   1 /* Copyright (C) 2004-2014 Free Software Foundation, Inc.
   2
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FENV_H
  20 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  21 #endif
  22
  23 /* Define bits representing exceptions in the FPSR status word.  */
  24 enum
  25   {
  26     FE_INVALID =
  27 #define FE_INVALID      1
  28       FE_INVALID,
  29     FE_DIVBYZERO =
  30 #define FE_DIVBYZERO    2
  31       FE_DIVBYZERO,
  32     FE_OVERFLOW =
  33 #define FE_OVERFLOW     4
  34       FE_OVERFLOW,
  35     FE_UNDERFLOW =
  36 #define FE_UNDERFLOW    8
  37       FE_UNDERFLOW,
  38     FE_INEXACT =
  39 #define FE_INEXACT      16
  40       FE_INEXACT,
  41   };
  42
  43 /* Amount to shift by to convert an exception bit in FPSR to a an
  44    exception bit mask in FPCR.  */
  45 #define FE_EXCEPT_SHIFT 8
  46
  47 /* All supported exceptions.  */
  48 #define FE_ALL_EXCEPT   \
  49         (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
  50
  51 /* Define bits representing rounding modes in the FPCR Rmode field.  */
  52 #define FE_TONEAREST  0x000000
  53 #define FE_UPWARD     0x400000
  54 #define FE_DOWNWARD   0x800000
  55 #define FE_TOWARDZERO 0xc00000
  56
  57 /* Type representing exception flags. */
  58 typedef unsigned int fexcept_t;
  59
  60 /* Type representing floating-point environment.  */
  61 typedef struct
  62   {
  63     unsigned int __fpcr;
  64     unsigned int __fpsr;
  65   }
  66 fenv_t;
  67
  68 /* If the default argument is used we use this value.  */
  69 #define FE_DFL_ENV      ((const fenv_t *) -1l)
  70
  71 #ifdef __USE_GNU
  72 /* Floating-point environment where none of the exceptions are masked.  */
  73 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  74 #endif