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1 | /* Copyright (C) 2004-2022 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 | <https://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 |
75 | |
76 | #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) |
77 | /* Type representing floating-point control modes. */ |
78 | typedef unsigned int femode_t; |
79 | |
80 | /* Default floating-point control modes. */ |
81 | # define FE_DFL_MODE ((const femode_t *) -1L) |
82 | #endif |
83 |
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