1 | /* Install given floating-point environment and raise exceptions. |
2 | Copyright (C) 1997-2022 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 <unistd.h> |
21 | #include <dl-procinfo.h> |
22 | #include <ldsodefs.h> |
23 | |
24 | int |
25 | __feupdateenv (const fenv_t *envp) |
26 | { |
27 | fexcept_t temp; |
28 | unsigned int xtemp = 0; |
29 | |
30 | /* Save current exceptions. */ |
31 | __asm__ ("fnstsw %0" : "=m" (*&temp)); |
32 | |
33 | /* If the CPU supports SSE we test the MXCSR as well. */ |
34 | if (CPU_FEATURE_USABLE (SSE)) |
35 | __asm__ ("stmxcsr %0" : "=m" (*&xtemp)); |
36 | |
37 | temp = (temp | xtemp) & FE_ALL_EXCEPT; |
38 | |
39 | /* Install new environment. */ |
40 | __fesetenv (envp: envp); |
41 | |
42 | /* Raise the saved exception. Incidently for us the implementation |
43 | defined format of the values in objects of type fexcept_t is the |
44 | same as the ones specified using the FE_* constants. */ |
45 | __feraiseexcept (excepts: (int) temp); |
46 | |
47 | /* Success. */ |
48 | return 0; |
49 | } |
50 | |
51 | #include <shlib-compat.h> |
52 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
53 | strong_alias (__feupdateenv, __old_feupdateenv) |
54 | compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1); |
55 | #endif |
56 | |
57 | libm_hidden_def (__feupdateenv) |
58 | libm_hidden_ver (__feupdateenv, feupdateenv) |
59 | versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2); |
60 | |