| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 2004-2016 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 | <http://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 exceptions in the FPU status word. */ |
| 23 | enum |
| 24 | { |
| 25 | FE_INVALID = |
| 26 | #define FE_INVALID 1 |
| 27 | FE_INVALID, |
| 28 | FE_DIVBYZERO = |
| 29 | #define FE_DIVBYZERO 2 |
| 30 | FE_DIVBYZERO, |
| 31 | FE_OVERFLOW = |
| 32 | #define FE_OVERFLOW 4 |
| 33 | FE_OVERFLOW, |
| 34 | FE_UNDERFLOW = |
| 35 | #define FE_UNDERFLOW 8 |
| 36 | FE_UNDERFLOW, |
| 37 | FE_INEXACT = |
| 38 | #define FE_INEXACT 16 |
| 39 | FE_INEXACT, |
| 40 | }; |
| 41 | |
| 42 | /* Amount to shift by to convert an exception to a mask bit. */ |
| 43 | #define FE_EXCEPT_SHIFT 8 |
| 44 | |
| 45 | /* All supported exceptions. */ |
| 46 | #define FE_ALL_EXCEPT \ |
| 47 | (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) |
| 48 | |
| 49 | /* VFP supports all of the four defined rounding modes. */ |
| 50 | enum |
| 51 | { |
| 52 | FE_TONEAREST = |
| 53 | #define FE_TONEAREST 0 |
| 54 | FE_TONEAREST, |
| 55 | FE_UPWARD = |
| 56 | #define FE_UPWARD 0x400000 |
| 57 | FE_UPWARD, |
| 58 | FE_DOWNWARD = |
| 59 | #define FE_DOWNWARD 0x800000 |
| 60 | FE_DOWNWARD, |
| 61 | FE_TOWARDZERO = |
| 62 | #define FE_TOWARDZERO 0xc00000 |
| 63 | FE_TOWARDZERO |
| 64 | }; |
| 65 | |
| 66 | /* Type representing exception flags. */ |
| 67 | typedef unsigned int fexcept_t; |
| 68 | |
| 69 | /* Type representing floating-point environment. */ |
| 70 | typedef struct |
| 71 | { |
| 72 | unsigned int __cw; |
| 73 | } |
| 74 | fenv_t; |
| 75 | |
| 76 | /* If the default argument is used we use this value. */ |
| 77 | #define FE_DFL_ENV ((const fenv_t *) -1l) |
| 78 | |
| 79 | #ifdef __USE_GNU |
| 80 | /* Floating-point environment where none of the exceptions are masked. */ |
| 81 | # define FE_NOMASK_ENV ((const fenv_t *) -2) |
| 82 | #endif |