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1 | /* Copyright (C) 2000-2024 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 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. |
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 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library. If not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _FENV_H |
19 | # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." |
20 | #endif |
21 | |
22 | /* Define bits representing the exception. We use the values of the |
23 | appropriate enable bits in the FPU status word (which, |
24 | coincidentally, are the same as the flag bits, but shifted right by |
25 | 27 bits). */ |
26 | enum |
27 | { |
28 | FE_INVALID = |
29 | #define FE_INVALID (1<<4) /* V */ |
30 | FE_INVALID, |
31 | FE_DIVBYZERO = |
32 | #define FE_DIVBYZERO (1<<3) /* Z */ |
33 | FE_DIVBYZERO, |
34 | FE_OVERFLOW = |
35 | #define FE_OVERFLOW (1<<2) /* O */ |
36 | FE_OVERFLOW, |
37 | FE_UNDERFLOW = |
38 | #define FE_UNDERFLOW (1<<1) /* U */ |
39 | FE_UNDERFLOW, |
40 | FE_INEXACT = |
41 | #define FE_INEXACT (1<<0) /* I */ |
42 | FE_INEXACT, |
43 | }; |
44 | |
45 | #define FE_ALL_EXCEPT \ |
46 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) |
47 | |
48 | /* The PA-RISC FPU supports all of the four defined rounding modes. |
49 | We use the values of the RM field in the floating point status |
50 | register for the appropriate macros. */ |
51 | enum |
52 | { |
53 | FE_TONEAREST = |
54 | #define FE_TONEAREST (0 << 9) |
55 | FE_TONEAREST, |
56 | FE_TOWARDZERO = |
57 | #define FE_TOWARDZERO (1 << 9) |
58 | FE_TOWARDZERO, |
59 | FE_UPWARD = |
60 | #define FE_UPWARD (2 << 9) |
61 | FE_UPWARD, |
62 | FE_DOWNWARD = |
63 | #define FE_DOWNWARD (3 << 9) |
64 | FE_DOWNWARD, |
65 | }; |
66 | |
67 | /* Type representing exception flags. */ |
68 | typedef unsigned int fexcept_t; |
69 | |
70 | /* Type representing floating-point environment. This structure |
71 | corresponds to the layout of the status and exception words in the |
72 | register file. The exception registers are never saved/stored by |
73 | userspace. This structure is also not correctly aligned ever, in |
74 | an ABI error we left out __aligned(8) and subsequently all of our |
75 | fenv functions must accept unaligned input, align the input, and |
76 | then use assembly to store fr0. This is a performance hit, but |
77 | means the ABI is stable. */ |
78 | typedef struct |
79 | { |
80 | unsigned int __status_word; |
81 | unsigned int __exception[7]; |
82 | } fenv_t; |
83 | |
84 | /* If the default argument is used we use this value. */ |
85 | #define FE_DFL_ENV ((const fenv_t *) -1) |
86 | |
87 | #ifdef __USE_GNU |
88 | /* Floating-point environment where none of the exceptions are masked. */ |
89 | # define FE_NOMASK_ENV ((const fenv_t *) -2) |
90 | #endif |
91 | |
92 | #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) |
93 | /* Type representing floating-point control modes. */ |
94 | typedef unsigned int femode_t; |
95 | |
96 | /* Default floating-point control modes. */ |
97 | # define FE_DFL_MODE ((const femode_t *) -1L) |
98 | #endif |
99 |
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