1/* Floating point environment.
2 Copyright (C) 2022-2026 Free Software Foundation, Inc.
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
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 <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 the exception. We use the bit positions
24 of the appropriate bits in the FPU control word. */
25enum
26{
27 FE_INEXACT =
28#define FE_INEXACT 0x010000
29 FE_INEXACT,
30 FE_UNDERFLOW =
31#define FE_UNDERFLOW 0x020000
32 FE_UNDERFLOW,
33 FE_OVERFLOW =
34#define FE_OVERFLOW 0x040000
35 FE_OVERFLOW,
36 FE_DIVBYZERO =
37#define FE_DIVBYZERO 0x080000
38 FE_DIVBYZERO,
39 FE_INVALID =
40#define FE_INVALID 0x100000
41 FE_INVALID,
42};
43
44#define FE_ALL_EXCEPT \
45 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
46
47/* The LoongArch FPU supports all of the four defined rounding modes. We
48 use again the bit positions in the FPU control word as the values
49 for the appropriate macros. */
50enum
51{
52 FE_TONEAREST =
53#define FE_TONEAREST 0x000
54 FE_TONEAREST,
55 FE_TOWARDZERO =
56#define FE_TOWARDZERO 0x100
57 FE_TOWARDZERO,
58 FE_UPWARD =
59#define FE_UPWARD 0x200
60 FE_UPWARD,
61 FE_DOWNWARD =
62#define FE_DOWNWARD 0x300
63 FE_DOWNWARD
64};
65
66/* Type representing exception flags. */
67typedef unsigned int fexcept_t;
68
69/* Type representing floating-point environment. This function corresponds
70 to the layout of the block written by the `fstenv'. */
71typedef struct
72{
73 unsigned int __fp_control_register;
74} fenv_t;
75
76/* If the default argument is used we use this value. */
77#define FE_DFL_ENV ((const fenv_t *) -1)
78
79#ifdef __USE_GNU
80/* Floating-point environment where none of the exception is masked. */
81#define FE_NOMASK_ENV ((const fenv_t *) -257)
82#endif
83
84#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
85/* Type representing floating-point control modes. */
86typedef unsigned int femode_t;
87
88/* Default floating-point control modes. */
89#define FE_DFL_MODE ((const femode_t *) -1L)
90#endif