sysdeps/mips/bits/fenv.h

   1 /* Copyright (C) 1998-2019 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 #ifdef __mips_hard_float
  24
  25 /* Define bits representing the exception.  We use the bit positions
  26    of the appropriate bits in the FPU control word.  */
  27 enum
  28   {
  29     FE_INEXACT =
  30 # define FE_INEXACT     0x04
  31       FE_INEXACT,
  32     FE_UNDERFLOW =
  33 # define FE_UNDERFLOW   0x08
  34       FE_UNDERFLOW,
  35     FE_OVERFLOW =
  36 # define FE_OVERFLOW    0x10
  37       FE_OVERFLOW,
  38     FE_DIVBYZERO =
  39 # define FE_DIVBYZERO   0x20
  40       FE_DIVBYZERO,
  41     FE_INVALID =
  42 # define FE_INVALID     0x40
  43       FE_INVALID,
  44   };
  45
  46 # define FE_ALL_EXCEPT \
  47         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  48
  49 /* The MIPS FPU supports all of the four defined rounding modes.  We
  50    use again the bit positions in the FPU control word as the values
  51    for the appropriate macros.  */
  52 enum
  53   {
  54     FE_TONEAREST =
  55 # define FE_TONEAREST   0x0
  56       FE_TONEAREST,
  57     FE_TOWARDZERO =
  58 # define FE_TOWARDZERO  0x1
  59       FE_TOWARDZERO,
  60     FE_UPWARD =
  61 # define FE_UPWARD      0x2
  62       FE_UPWARD,
  63     FE_DOWNWARD =
  64 # define FE_DOWNWARD    0x3
  65       FE_DOWNWARD
  66   };
  67
  68 #else
  69
  70 /* In the soft-float case, only rounding to nearest is supported, with
  71    no exceptions.  */
  72
  73 enum
  74   {
  75     __FE_UNDEFINED = -1,
  76
  77     FE_TONEAREST =
  78 # define FE_TONEAREST   0x0
  79       FE_TONEAREST
  80   };
  81
  82 # define FE_ALL_EXCEPT 0
  83
  84 #endif
  85
  86
  87 /* Type representing exception flags.  */
  88 typedef unsigned short int fexcept_t;
  89
  90
  91 /* Type representing floating-point environment.  This function corresponds
  92    to the layout of the block written by the `fstenv'.  */
  93 typedef struct
  94   {
  95     unsigned int __fp_control_register;
  96   }
  97 fenv_t;
  98
  99 /* If the default argument is used we use this value.  */
 100 #define FE_DFL_ENV      ((const fenv_t *) -1)
 101
 102 #if defined __USE_GNU && defined __mips_hard_float
 103 /* Floating-point environment where none of the exception is masked.  */
 104 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
 105 #endif
 106
 107 #if __GLIBC_USE (IEC_60559_BFP_EXT)
 108 /* Type representing floating-point control modes.  */
 109 typedef unsigned int femode_t;
 110
 111 /* Default floating-point control modes.  */
 112 # define FE_DFL_MODE    ((const femode_t *) -1L)
 113 #endif