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1 | /* Test exception in current environment. | |
2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com). | |
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 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <fenv_libc.h> | |
21 | #include <fpu_control.h> | |
22 | ||
23 | int | |
24 | fetestexcept (int excepts) | |
25 | { | |
26 | fexcept_t temp, res; | |
27 | ||
28 | /* Get current exceptions. */ | |
29 | _FPU_GETCW (temp); | |
30 | res = temp >> FPC_FLAGS_SHIFT; | |
31 | if ((temp & FPC_NOT_FPU_EXCEPTION) == 0) | |
32 | /* Bits 6, 7 of dxc-byte are zero, | |
33 | thus bits 0-5 of dxc-byte correspond to the flag-bits. | |
34 | Evaluate flags and last dxc-exception-code. */ | |
35 | res |= temp >> FPC_DXC_SHIFT; | |
36 | ||
37 | return res & excepts & FE_ALL_EXCEPT; | |
38 | } | |
39 | libm_hidden_def (fetestexcept) |