1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif
/* Define bits representing the exception. We use the bit positions
of the appropriate bits in the FPU control word. */
enum
{
FE_INVALID =
#define FE_INVALID 0x01
FE_INVALID,
__FE_DENORM = 0x02,
FE_DIVBYZERO =
#define FE_DIVBYZERO 0x04
FE_DIVBYZERO,
FE_OVERFLOW =
#define FE_OVERFLOW 0x08
FE_OVERFLOW,
FE_UNDERFLOW =
#define FE_UNDERFLOW 0x10
FE_UNDERFLOW,
FE_INEXACT =
#define FE_INEXACT 0x20
FE_INEXACT
};
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The ix87 FPU supports all of the four defined rounding modes. We
use again the bit positions in the FPU control word as the values
for the appropriate macros. */
enum
{
FE_TONEAREST =
#define FE_TONEAREST 0
FE_TONEAREST,
FE_DOWNWARD =
#define FE_DOWNWARD 0x400
FE_DOWNWARD,
FE_UPWARD =
#define FE_UPWARD 0x800
FE_UPWARD,
FE_TOWARDZERO =
#define FE_TOWARDZERO 0xc00
FE_TOWARDZERO
};
/* Type representing exception flags. */
typedef unsigned short int fexcept_t;
/* Type representing floating-point environment. This structure
corresponds to the layout of the block written by the `fstenv'
instruction and has additional fields for the contents of the MXCSR
register as written by the `stmxcsr' instruction. */
typedef struct
{
unsigned short int __control_word;
unsigned short int __glibc_reserved1;
unsigned short int __status_word;
unsigned short int __glibc_reserved2;
unsigned short int __tags;
unsigned short int __glibc_reserved3;
unsigned int __eip;
unsigned short int __cs_selector;
unsigned int __opcode:11;
unsigned int __glibc_reserved4:5;
unsigned int __data_offset;
unsigned short int __data_selector;
unsigned short int __glibc_reserved5;
#ifdef __x86_64__
unsigned int __mxcsr;
#endif
}
fenv_t;
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((const fenv_t *) -1)
#ifdef __USE_GNU
/* Floating-point environment where none of the exception is masked. */
# define FE_NOMASK_ENV ((const fenv_t *) -2)
#endif
#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
/* Type representing floating-point control modes. */
typedef struct
{
unsigned short int __control_word;
unsigned short int __glibc_reserved;
unsigned int __mxcsr;
}
femode_t;
/* Default floating-point control modes. */
# define FE_DFL_MODE ((const femode_t *) -1L)
#endif
|
