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858db9cb | 1 | /* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc. |
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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. | |
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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. |
ea0499d2 | 13 | |
3214b89b AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
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18 | |
19 | #ifndef _FENV_H | |
20 | # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." | |
21 | #endif | |
22 | ||
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_INEXACT = 0x04, | |
29 | #define FE_INEXACT FE_INEXACT | |
30 | FE_UNDERFLOW = 0x08, | |
31 | #define FE_UNDERFLOW FE_UNDERFLOW | |
32 | FE_OVERFLOW = 0x10, | |
33 | #define FE_OVERFLOW FE_OVERFLOW | |
34 | FE_DIVBYZERO = 0x20, | |
35 | #define FE_DIVBYZERO FE_DIVBYZERO | |
36 | FE_INVALID = 0x40, | |
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 MIPS FPU supports all of the four defined rounding modes. We | |
44 | use again the bit positions in the FPU control word as the values | |
45 | for the appropriate macros. */ | |
46 | enum | |
47 | { | |
48 | FE_TONEAREST = 0x0, | |
49 | #define FE_TONEAREST FE_TONEAREST | |
50 | FE_TOWARDZERO = 0x1, | |
51 | #define FE_TOWARDZERO FE_TOWARDZERO | |
52 | FE_UPWARD = 0x2, | |
53 | #define FE_UPWARD FE_UPWARD | |
54 | FE_DOWNWARD = 0x3 | |
55 | #define FE_DOWNWARD FE_DOWNWARD | |
56 | }; | |
57 | ||
58 | ||
59 | /* Type representing exception flags. */ | |
60 | typedef unsigned short int fexcept_t; | |
61 | ||
62 | ||
63 | /* Type representing floating-point environment. This function corresponds | |
64 | to the layout of the block written by the `fstenv'. */ | |
65 | typedef struct | |
66 | { | |
d3cbb980 | 67 | unsigned int __fp_control_register; |
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68 | } |
69 | fenv_t; | |
70 | ||
71 | /* If the default argument is used we use this value. */ | |
858db9cb | 72 | #define FE_DFL_ENV ((__const fenv_t *) -1) |
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73 | |
74 | #ifdef __USE_GNU | |
75 | /* Floating-point environment where none of the exception is masked. */ | |
76 | # define FE_NOMASK_ENV ((__const fenv_t *) -2) | |
77 | #endif |