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04277e02 | 1 | /* Copyright (C) 2000-2019 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by David Huggins-Daines <dhd@debian.org> | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
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9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 13 | Lesser General Public License for more details. |
fb0f0053 | 14 | |
3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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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 | /* Define bits representing the exception. We use the values of the | |
24 | appropriate enable bits in the FPU status word (which, | |
25 | coincidentally, are the same as the flag bits, but shifted right by | |
26 | 27 bits). */ | |
27 | enum | |
28 | { | |
fbeafede JM |
29 | FE_INVALID = |
30 | #define FE_INVALID (1<<4) /* V */ | |
31 | FE_INVALID, | |
32 | FE_DIVBYZERO = | |
33 | #define FE_DIVBYZERO (1<<3) /* Z */ | |
34 | FE_DIVBYZERO, | |
35 | FE_OVERFLOW = | |
36 | #define FE_OVERFLOW (1<<2) /* O */ | |
37 | FE_OVERFLOW, | |
38 | FE_UNDERFLOW = | |
39 | #define FE_UNDERFLOW (1<<1) /* U */ | |
40 | FE_UNDERFLOW, | |
41 | FE_INEXACT = | |
42 | #define FE_INEXACT (1<<0) /* I */ | |
43 | FE_INEXACT, | |
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44 | }; |
45 | ||
46 | #define FE_ALL_EXCEPT \ | |
47 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) | |
48 | ||
49 | /* The PA-RISC FPU supports all of the four defined rounding modes. | |
50 | We use the values of the RM field in the floating point status | |
51 | register for the appropriate macros. */ | |
52 | enum | |
53 | { | |
fbeafede JM |
54 | FE_TONEAREST = |
55 | #define FE_TONEAREST (0 << 9) | |
56 | FE_TONEAREST, | |
57 | FE_TOWARDZERO = | |
58 | #define FE_TOWARDZERO (1 << 9) | |
59 | FE_TOWARDZERO, | |
60 | FE_UPWARD = | |
61 | #define FE_UPWARD (2 << 9) | |
62 | FE_UPWARD, | |
63 | FE_DOWNWARD = | |
64 | #define FE_DOWNWARD (3 << 9) | |
65 | FE_DOWNWARD, | |
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66 | }; |
67 | ||
68 | /* Type representing exception flags. */ | |
69 | typedef unsigned int fexcept_t; | |
70 | ||
71 | /* Type representing floating-point environment. This structure | |
72 | corresponds to the layout of the status and exception words in the | |
48dcf1c5 CD |
73 | register file. The exception registers are never saved/stored by |
74 | userspace. This structure is also not correctly aligned ever, in | |
75 | an ABI error we left out __aligned(8) and subsequently all of our | |
76 | fenv functions must accept unaligned input, align the input, and | |
5556231d | 77 | then use assembly to store fr0. This is a performance hit, but |
48dcf1c5 | 78 | means the ABI is stable. */ |
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79 | typedef struct |
80 | { | |
81 | unsigned int __status_word; | |
82 | unsigned int __exception[7]; | |
83 | } fenv_t; | |
84 | ||
85 | /* If the default argument is used we use this value. */ | |
acfa885f | 86 | #define FE_DFL_ENV ((const fenv_t *) -1) |
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87 | |
88 | #ifdef __USE_GNU | |
89 | /* Floating-point environment where none of the exceptions are masked. */ | |
acfa885f | 90 | # define FE_NOMASK_ENV ((const fenv_t *) -2) |
fb0f0053 | 91 | #endif |
ec94343f JM |
92 | |
93 | #if __GLIBC_USE (IEC_60559_BFP_EXT) | |
94 | /* Type representing floating-point control modes. */ | |
95 | typedef unsigned int femode_t; | |
96 | ||
97 | /* Default floating-point control modes. */ | |
98 | # define FE_DFL_MODE ((const femode_t *) -1L) | |
99 | #endif |