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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/i386/fpu/feupdateenv.c
1 /* Install given floating-point environment and raise exceptions.
2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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.
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.
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/>. */
22 #include <dl-procinfo.h>
26 __feupdateenv (const fenv_t
*envp
)
29 unsigned int xtemp
= 0;
31 /* Save current exceptions. */
32 __asm__ ("fnstsw %0" : "=m" (*&temp
));
34 /* If the CPU supports SSE we test the MXCSR as well. */
35 if (HAS_CPU_FEATURE (SSE
))
36 __asm__ ("stmxcsr %0" : "=m" (*&xtemp
));
38 temp
= (temp
| xtemp
) & FE_ALL_EXCEPT
;
40 /* Install new environment. */
43 /* Raise the saved exception. Incidently for us the implementation
44 defined format of the values in objects of type fexcept_t is the
45 same as the ones specified using the FE_* constants. */
46 __feraiseexcept ((int) temp
);
52 #include <shlib-compat.h>
53 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
54 strong_alias (__feupdateenv
, __old_feupdateenv
)
55 compat_symbol (libm
, __old_feupdateenv
, feupdateenv
, GLIBC_2_1
);
58 libm_hidden_def (__feupdateenv
)
59 libm_hidden_ver (__feupdateenv
, feupdateenv
)
60 versioned_symbol (libm
, __feupdateenv
, feupdateenv
, GLIBC_2_2
);