sysdeps/s390/fpu/bits/fenv.h

   1 /* Copyright (C) 2000-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Denis Joseph Barrow <djbarrow@de.ibm.com>.
   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
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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 the exception.  We use the bit positions
  24    of the appropriate bits in the FPU control word.  */
  25 enum
  26   {
  27     FE_INVALID =
  28 #define FE_INVALID      0x80
  29       FE_INVALID,
  30     FE_DIVBYZERO =
  31 #define FE_DIVBYZERO    0x40
  32       FE_DIVBYZERO,
  33     FE_OVERFLOW =
  34 #define FE_OVERFLOW     0x20
  35       FE_OVERFLOW,
  36     FE_UNDERFLOW =
  37 #define FE_UNDERFLOW    0x10
  38       FE_UNDERFLOW,
  39     FE_INEXACT =
  40 #define FE_INEXACT      0x08
  41       FE_INEXACT
  42   };
  43 /* We dont use the y bit of the DXC in the floating point control register
  44    as glibc has no FE encoding for fe inexact incremented
  45    or fe inexact truncated.
  46    We currently  use the flag bits in the fpc
  47    as these are sticky for feholdenv & feupdatenv as it is defined
  48    in the HP Manpages.  */
  49
  50
  51 #define FE_ALL_EXCEPT \
  52         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  53
  54 enum
  55   {
  56     FE_TONEAREST =
  57 #define FE_TONEAREST    0
  58       FE_TONEAREST,
  59     FE_DOWNWARD =
  60 #define FE_DOWNWARD     0x3
  61       FE_DOWNWARD,
  62     FE_UPWARD =
  63 #define FE_UPWARD       0x2
  64       FE_UPWARD,
  65     FE_TOWARDZERO =
  66 #define FE_TOWARDZERO   0x1
  67       FE_TOWARDZERO
  68   };
  69
  70
  71 /* Type representing exception flags.  */
  72 typedef unsigned int fexcept_t; /* size of fpc */
  73
  74
  75 /* Type representing floating-point environment.  This function corresponds
  76    to the layout of the block written by the `fstenv'.  */
  77 typedef struct
  78 {
  79   fexcept_t __fpc;
  80   void *__ieee_instruction_pointer;
  81   /* failing instruction for ieee exceptions */
  82 } fenv_t;
  83
  84 /* If the default argument is used we use this value.  */
  85 #define FE_DFL_ENV      ((const fenv_t *) -1)
  86
  87 #ifdef __USE_GNU
  88 /* Floating-point environment where none of the exceptions are masked.  */
  89 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  90 #endif