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1 | /* Copyright (C) 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
5107cf1d | 19 | #ifndef _FENV_H |
f4017d20 | 20 | # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." |
5107cf1d | 21 | #endif |
dd33e89f | 22 | |
dd33e89f UD |
23 | |
24 | /* Define bits representing the exception. We use the bit positions of | |
25 | the appropriate bits in the FPSR Accrued Exception Byte. */ | |
26 | enum | |
27 | { | |
28 | FE_INEXACT = 1 << 3, | |
29 | #define FE_INEXACT FE_INEXACT | |
30 | FE_DIVBYZERO = 1 << 4, | |
31 | #define FE_DIVBYZERO FE_DIVBYZERO | |
32 | FE_UNDERFLOW = 1 << 5, | |
33 | #define FE_UNDERFLOW FE_UNDERFLOW | |
34 | FE_OVERFLOW = 1 << 6, | |
35 | #define FE_OVERFLOW FE_OVERFLOW | |
36 | FE_INVALID = 1 << 7 | |
37 | #define FE_INVALID FE_INVALID | |
38 | }; | |
39 | ||
40 | #define FE_ALL_EXCEPT \ | |
41 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) | |
42 | ||
43 | /* The m68k FPU supports all of the four defined rounding modes. We use | |
44 | the bit positions in the FPCR Mode Control Byte as the values for the | |
45 | appropriate macros. */ | |
46 | enum | |
47 | { | |
48 | FE_TONEAREST = 0, | |
49 | #define FE_TONEAREST FE_TONEAREST | |
50 | FE_TOWARDSZERO = 1 << 4, | |
51 | #define FE_TOWARDSZERO FE_TOWARDSZERO | |
52 | FE_DOWNWARD = 2 << 4, | |
53 | #define FE_DOWNWARD FE_DOWNWARD | |
54 | FE_UPWARD = 3 << 4 | |
55 | #define FE_UPWARD FE_UPWARD | |
56 | }; | |
57 | ||
58 | ||
59 | /* Type representing exception flags. */ | |
60 | typedef unsigned int fexcept_t; | |
61 | ||
62 | ||
63 | /* Type representing floating-point environment. This structure | |
64 | corresponds to the layout of the block written by `fmovem'. */ | |
65 | typedef struct | |
66 | { | |
67 | fexcept_t control_register; | |
68 | fexcept_t status_register; | |
69 | } | |
70 | fenv_t; | |
71 | ||
72 | /* If the default argument is used we use this value. */ | |
73 | #define FE_DFL_ENV ((fenv_t *) -1) | |
74 | ||
75 | #ifdef __USE_GNU | |
76 | /* Floating-point environment where none of the exceptions are masked. */ | |
77 | # define FE_NOMASK_ENV ((fenv_t *) -2) | |
78 | #endif |