1 /* Clear given exceptions in current floating-point environment.
2 Copyright (C) 1997-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
22 #include <dl-procinfo.h>
25 __feclearexcept (int excepts
)
29 /* Mask out unsupported bits/exceptions. */
30 excepts
&= FE_ALL_EXCEPT
;
32 /* Bah, we have to clear selected exceptions. Since there is no
33 `fldsw' instruction we have to do it the hard way. */
34 __asm__ ("fnstenv %0" : "=m" (*&temp
));
36 /* Clear the relevant bits. */
37 temp
.__status_word
&= excepts
^ FE_ALL_EXCEPT
;
39 /* Put the new data in effect. */
40 __asm__ ("fldenv %0" : : "m" (*&temp
));
42 /* If the CPU supports SSE, we clear the MXCSR as well. */
43 if (CPU_FEATURE_USABLE (SSE
))
45 unsigned int xnew_exc
;
47 /* Get the current MXCSR. */
48 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc
));
50 /* Clear the relevant bits. */
53 /* Put the new data in effect. */
54 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc
));
61 #include <shlib-compat.h>
62 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
63 strong_alias (__feclearexcept
, __old_feclearexcept
)
64 compat_symbol (libm
, __old_feclearexcept
, feclearexcept
, GLIBC_2_1
);
67 libm_hidden_ver (__feclearexcept
, feclearexcept
)
68 versioned_symbol (libm
, __feclearexcept
, feclearexcept
, GLIBC_2_2
);