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b168057a | 1 | /* Copyright (C) 1997-2015 Free Software Foundation, Inc. |
21bc60d2 UD |
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 | |
3214b89b AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
21bc60d2 UD |
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 | |
3214b89b | 12 | Lesser General Public License for more details. |
21bc60d2 | 13 | |
3214b89b | 14 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
21bc60d2 UD |
17 | |
18 | #ifndef _FENV_H | |
90571408 | 19 | # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." |
21bc60d2 UD |
20 | #endif |
21 | ||
22 | ||
23 | /* Define bits representing the exception. We use the bit positions of | |
24 | the appropriate bits in the FPSR Accrued Exception Byte. */ | |
25 | enum | |
26 | { | |
fbeafede JM |
27 | FE_INEXACT = |
28 | #define FE_INEXACT (1 << 3) | |
29 | FE_INEXACT, | |
30 | FE_DIVBYZERO = | |
31 | #define FE_DIVBYZERO (1 << 4) | |
32 | FE_DIVBYZERO, | |
33 | FE_UNDERFLOW = | |
34 | #define FE_UNDERFLOW (1 << 5) | |
35 | FE_UNDERFLOW, | |
36 | FE_OVERFLOW = | |
37 | #define FE_OVERFLOW (1 << 6) | |
38 | FE_OVERFLOW, | |
39 | FE_INVALID = | |
40 | #define FE_INVALID (1 << 7) | |
41 | FE_INVALID | |
21bc60d2 UD |
42 | }; |
43 | ||
44 | #define FE_ALL_EXCEPT \ | |
45 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) | |
46 | ||
47 | /* The m68k FPU supports all of the four defined rounding modes. We use | |
48 | the bit positions in the FPCR Mode Control Byte as the values for the | |
49 | appropriate macros. */ | |
50 | enum | |
51 | { | |
fbeafede JM |
52 | FE_TONEAREST = |
53 | #define FE_TONEAREST 0 | |
54 | FE_TONEAREST, | |
55 | FE_TOWARDZERO = | |
56 | #define FE_TOWARDZERO (1 << 4) | |
57 | FE_TOWARDZERO, | |
58 | FE_DOWNWARD = | |
59 | #define FE_DOWNWARD (2 << 4) | |
60 | FE_DOWNWARD, | |
61 | FE_UPWARD = | |
62 | #define FE_UPWARD (3 << 4) | |
63 | FE_UPWARD | |
21bc60d2 UD |
64 | }; |
65 | ||
66 | ||
67 | /* Type representing exception flags. */ | |
68 | typedef unsigned int fexcept_t; | |
69 | ||
70 | ||
71 | /* Type representing floating-point environment. This structure | |
72 | corresponds to the layout of the block written by `fmovem'. */ | |
73 | typedef struct | |
74 | { | |
303e5382 AS |
75 | unsigned int __control_register; |
76 | unsigned int __status_register; | |
77 | unsigned int __instruction_address; | |
21bc60d2 UD |
78 | } |
79 | fenv_t; | |
80 | ||
81 | /* If the default argument is used we use this value. */ | |
ae9df5c8 | 82 | #define FE_DFL_ENV ((const fenv_t *) -1) |
21bc60d2 UD |
83 | |
84 | #ifdef __USE_GNU | |
85 | /* Floating-point environment where none of the exceptions are masked. */ | |
ae9df5c8 | 86 | # define FE_NOMASK_ENV ((const fenv_t *) -2) |
21bc60d2 | 87 | #endif |