1 /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
19 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
23 /* Define bits representing the exception. We use the bit positions
24 of the appropriate bits in the FPU control word. */
28 #define FE_INVALID FE_INVALID
31 #define FE_DIVBYZERO FE_DIVBYZERO
33 #define FE_OVERFLOW FE_OVERFLOW
35 #define FE_UNDERFLOW FE_UNDERFLOW
37 #define FE_INEXACT FE_INEXACT
40 #define FE_ALL_EXCEPT \
41 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
43 /* The ix87 FPU supports all of the four defined rounding modes. We
44 use again the bit positions in the FPU control word as the values
45 for the appropriate macros. */
49 #define FE_TONEAREST FE_TONEAREST
51 #define FE_DOWNWARD FE_DOWNWARD
53 #define FE_UPWARD FE_UPWARD
55 #define FE_TOWARDZERO FE_TOWARDZERO
59 /* Type representing exception flags. */
60 typedef unsigned short int fexcept_t;
63 /* Type representing floating-point environment. This function corresponds
64 to the layout of the block written by the `fstenv'. */
67 unsigned short int __control_word;
68 unsigned short int __unused1;
69 unsigned short int __status_word;
70 unsigned short int __unused2;
71 unsigned short int __tags;
72 unsigned short int __unused3;
74 unsigned short int __cs_selector;
75 unsigned int __opcode:11;
76 unsigned int __unused4:5;
77 unsigned int __data_offset;
78 unsigned short int __data_selector;
79 unsigned short int __unused5;
83 /* If the default argument is used we use this value. */
84 #define FE_DFL_ENV ((const fenv_t *) -1)
87 /* Floating-point environment where none of the exception is masked. */
88 # define FE_NOMASK_ENV ((const fenv_t *) -2)