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63551311 UD |
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 |
63551311 | 22 | |
63551311 UD |
23 | |
24 | /* Define bits representing the exception. We use the bit positions | |
25 | of the appropriate bits in the FPU control word. */ | |
26 | enum | |
27 | { | |
28 | FE_INVALID = 0x01, | |
29 | #define FE_INVALID FE_INVALID | |
30 | __FE_DENORM = 0x02, | |
31 | FE_DIVBYZERO = 0x04, | |
32 | #define FE_DIVBYZERO FE_DIVBYZERO | |
33 | FE_OVERFLOW = 0x08, | |
34 | #define FE_OVERFLOW FE_OVERFLOW | |
35 | FE_UNDERFLOW = 0x10, | |
36 | #define FE_UNDERFLOW FE_UNDERFLOW | |
37 | FE_INEXACT = 0x20 | |
38 | #define FE_INEXACT FE_INEXACT | |
39 | }; | |
40 | ||
41 | #define FE_ALL_EXCEPT \ | |
42 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) | |
43 | ||
44 | /* The ix87 FPU supports all of the four defined rounding modes. We | |
45 | use again the bit positions in the FPU control word as the values | |
46 | for the appropriate macros. */ | |
47 | enum | |
48 | { | |
49 | FE_TONEAREST = 0, | |
50 | #define FE_TONEAREST FE_TONEAREST | |
51 | FE_DOWNWARD = 0x400, | |
52 | #define FE_DOWNWARD FE_DOWNWARD | |
53 | FE_UPWARD = 0x800, | |
54 | #define FE_UPWARD FE_UPWARD | |
55 | FE_TOWARDSZERO = 0xc00 | |
56 | #define FE_TOWARDSZERO FE_TOWARDSZERO | |
57 | }; | |
58 | ||
59 | ||
60 | /* Type representing exception flags. */ | |
61 | typedef unsigned short int fexcept_t; | |
62 | ||
63 | ||
f4017d20 UD |
64 | /* Type representing floating-point environment. This function corresponds |
65 | to the layout of the block written by the `fstenv'. */ | |
63551311 UD |
66 | typedef struct |
67 | { | |
68 | unsigned short int control_word; | |
69 | unsigned short int __unused1; | |
70 | unsigned short int status_word; | |
71 | unsigned short int __unused2; | |
72 | unsigned short int tags; | |
73 | unsigned short int __unused3; | |
74 | unsigned int eip; | |
75 | unsigned short int cs_selector; | |
76 | unsigned int opcode:11; | |
77 | unsigned int __unused4:5; | |
78 | unsigned int data_offset; | |
79 | unsigned short int data_selector; | |
80 | unsigned short int __unused5; | |
81 | } | |
82 | fenv_t; | |
83 | ||
84 | /* If the default argument is used we use this value. */ | |
85 | #define FE_DFL_ENV ((fenv_t *) -1) | |
86 | ||
87 | #ifdef __USE_GNU | |
88 | /* Floating-point environment where none of the exception is masked. */ | |
89 | # define FE_NOMASK_ENV ((fenv_t *) -2) | |
90 | #endif |