1 | /* Install given floating-point environment and raise exceptions. |
2 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
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. |
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 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library. If not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv.h> |
20 | #include <string.h> |
21 | |
22 | int |
23 | __feupdateenv (const fenv_t *envp) |
24 | { |
25 | union { unsigned long long l; unsigned int sw[2]; } s; |
26 | fenv_t temp; |
27 | /* Get the current exception status */ |
28 | __asm__ ("fstd %%fr0,0(%1) \n\t" |
29 | "fldd 0(%1),%%fr0 \n\t" |
30 | : "=m" (s.l) : "r" (&s.l)); |
31 | |
32 | /* Given environment with exception flags not cleared. */ |
33 | if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
34 | { |
35 | memcpy(dest: &temp, src: envp, n: sizeof (fenv_t)); |
36 | temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27); |
37 | } |
38 | |
39 | /* Default environment with exception flags not cleared. */ |
40 | if (envp == FE_DFL_ENV) |
41 | temp.__status_word = s.sw[0] & (FE_ALL_EXCEPT << 27); |
42 | |
43 | /* All traps enabled and current exception flags not cleared. */ |
44 | if (envp == FE_NOMASK_ENV) |
45 | temp.__status_word = (s.sw[0] & (FE_ALL_EXCEPT << 27)) | FE_ALL_EXCEPT; |
46 | |
47 | /* Install new environment. */ |
48 | __fesetenv (envp: &temp); |
49 | /* Success. */ |
50 | return 0; |
51 | } |
52 | libm_hidden_def (__feupdateenv) |
53 | weak_alias (__feupdateenv, feupdateenv) |
54 | libm_hidden_weak (feupdateenv) |
55 | |