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_libc.h>
20 #include <fpu_control.h>
21
22 int
__feupdateenv(const fenv_t * envp)23 __feupdateenv (const fenv_t *envp)
24 {
25 fenv_union_t old, new;
26
27 /* Save the currently set exceptions. */
28 new.fenv = *envp;
29 old.fenv = fegetenv_register ();
30
31 /* Restore rounding mode and exception enable from *envp and merge
32 exceptions. Leave fraction rounded/inexact and FP result/CC bits
33 unchanged. */
34 new.l = (old.l & 0xffffffff1fffff00LL) | (new.l & 0x1ff80fff);
35
36 __TEST_AND_EXIT_NON_STOP (old.l, new.l);
37 __TEST_AND_ENTER_NON_STOP (old.l, new.l);
38
39 /* Atomically enable and raise (if appropriate) exceptions set in `new'. */
40 fesetenv_register (new.fenv);
41
42 /* Success. */
43 return 0;
44 }
45
46 #include <shlib-compat.h>
47 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
48 strong_alias (__feupdateenv, __old_feupdateenv)
49 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
50 #endif
51
52 libm_hidden_def (__feupdateenv)
53 libm_hidden_ver (__feupdateenv, feupdateenv)
54 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);
55