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
|
/* Copyright (C) 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#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 FPSR Accrued Exception Byte. */
enum
{
FE_INEXACT = 1 << 3,
#define FE_INEXACT FE_INEXACT
FE_DIVBYZERO = 1 << 4,
#define FE_DIVBYZERO FE_DIVBYZERO
FE_UNDERFLOW = 1 << 5,
#define FE_UNDERFLOW FE_UNDERFLOW
FE_OVERFLOW = 1 << 6,
#define FE_OVERFLOW FE_OVERFLOW
FE_INVALID = 1 << 7
#define FE_INVALID FE_INVALID
};
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The m68k FPU supports all of the four defined rounding modes. We use
the bit positions in the FPCR Mode Control Byte as the values for the
appropriate macros. */
enum
{
FE_TONEAREST = 0,
#define FE_TONEAREST FE_TONEAREST
FE_TOWARDSZERO = 1 << 4,
#define FE_TOWARDSZERO FE_TOWARDSZERO
FE_DOWNWARD = 2 << 4,
#define FE_DOWNWARD FE_DOWNWARD
FE_UPWARD = 3 << 4
#define FE_UPWARD FE_UPWARD
};
/* Type representing exception flags. */
typedef unsigned int fexcept_t;
/* Type representing floating-point environment. This structure
corresponds to the layout of the block written by `fmovem'. */
typedef struct
{
fexcept_t control_register;
fexcept_t status_register;
}
fenv_t;
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((fenv_t *) -1)
#ifdef __USE_GNU
/* Floating-point environment where none of the exceptions are masked. */
# define FE_NOMASK_ENV ((fenv_t *) -2)
#endif
|
