| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Enable floating-point exceptions. |
| 2 | Copyright (C) 2000-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Geoffrey Keating <geoffk@geoffk.org>, 2000. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <fenv_libc.h> |
| 21 | |
| 22 | int |
| 23 | feenableexcept (int excepts) |
| 24 | { |
| 25 | fenv_union_t fe, curr; |
| 26 | int result, new; |
| 27 | |
| 28 | /* Get current exception mask to return. */ |
| 29 | fe.fenv = curr.fenv = fegetenv_register (); |
| 30 | result = fenv_reg_to_exceptions (fe.l); |
| 31 | |
| 32 | if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID) |
| 33 | excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID; |
| 34 | |
| 35 | /* Sets the new exception mask. */ |
| 36 | if (excepts & FE_INEXACT) |
| 37 | fe.l |= (1 << (31 - FPSCR_XE)); |
| 38 | if (excepts & FE_DIVBYZERO) |
| 39 | fe.l |= (1 << (31 - FPSCR_ZE)); |
| 40 | if (excepts & FE_UNDERFLOW) |
| 41 | fe.l |= (1 << (31 - FPSCR_UE)); |
| 42 | if (excepts & FE_OVERFLOW) |
| 43 | fe.l |= (1 << (31 - FPSCR_OE)); |
| 44 | if (excepts & FE_INVALID) |
| 45 | fe.l |= (1 << (31 - FPSCR_VE)); |
| 46 | |
| 47 | if (fe.l != curr.l) |
| 48 | fesetenv_register (fe.fenv); |
| 49 | |
| 50 | new = __fegetexcept (); |
| 51 | if (new != 0 && result == 0) |
| 52 | (void) __fe_nomask_env_priv (); |
| 53 | |
| 54 | if ((new & excepts) != excepts) |
| 55 | result = -1; |
| 56 | |
| 57 | return result; |
| 58 | } |