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1 | /* Copyright (C) 2000 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com). | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
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 | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
528be9fe | 18 | Boston, MA 02111-1307, USA. */ |
847b055c AJ |
19 | |
20 | #ifndef _FENV_H | |
21 | # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." | |
22 | #endif | |
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 = 0x80, | |
29 | #define FE_INVALID FE_INVALID | |
30 | FE_DIVBYZERO = 0x40, | |
31 | #define FE_DIVBYZERO FE_DIVBYZERO | |
32 | FE_OVERFLOW = 0x20, | |
33 | #define FE_OVERFLOW FE_OVERFLOW | |
34 | FE_UNDERFLOW = 0x10, | |
35 | #define FE_UNDERFLOW FE_UNDERFLOW | |
36 | FE_INEXACT = 0x08 | |
37 | #define FE_INEXACT FE_INEXACT | |
38 | }; | |
39 | /* We dont use the y bit of the DXC in the floating point control register | |
40 | * as glibc has no FE encoding for fe inexact incremented | |
41 | * or fe inexact truncated. | |
42 | * We currently use the flag bits in the fpc | |
43 | * as these are sticky for feholdenv & feupdatenv as it is defined | |
44 | * in the HP Manpages. | |
45 | */ | |
46 | ||
47 | ||
48 | #define FE_ALL_EXCEPT \ | |
49 | (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) | |
50 | ||
51 | enum | |
52 | { | |
53 | FE_TONEAREST = 0, | |
54 | #define FE_TONEAREST FE_TONEAREST | |
55 | FE_DOWNWARD = 0x3, | |
56 | #define FE_DOWNWARD FE_DOWNWARD | |
57 | FE_UPWARD = 0x2, | |
58 | #define FE_UPWARD FE_UPWARD | |
59 | FE_TOWARDZERO = 0x1 | |
60 | #define FE_TOWARDZERO FE_TOWARDZERO | |
61 | }; | |
62 | ||
847b055c AJ |
63 | |
64 | /* Type representing exception flags. */ | |
65 | typedef unsigned int fexcept_t; /* size of fpc */ | |
66 | ||
67 | ||
68 | /* Type representing floating-point environment. This function corresponds | |
69 | to the layout of the block written by the `fstenv'. */ | |
70 | typedef struct | |
71 | { | |
72 | fexcept_t fpc; | |
73 | void *ieee_instruction_pointer; | |
74 | /* failing instruction for ieee exceptions */ | |
75 | } fenv_t; | |
76 | ||
77 | /* If the default argument is used we use this value. */ | |
78 | #define FE_DFL_ENV ((fenv_t *) -1) | |
79 | ||
80 | #ifdef __USE_GNU | |
81 | /* Floating-point environment where none of the exceptions are masked. */ | |
82 | #define FE_NOMASK_ENV ((fenv_t *) -2) | |
83 | #endif |