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
__feupdateenv(const fenv_t * envp)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);
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 ((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