1 /* Disable floating-point exceptions.
2 Copyright (C) 1999-2024 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 fedisableexcept (int excepts
)
27 unsigned short int new_exc
, old_exc
;
29 /* Get the current control word. */
30 __asm__ ("fstcw %0" : "=m" (*&new_exc
));
32 old_exc
= (~new_exc
) & FE_ALL_EXCEPT
;
34 excepts
&= FE_ALL_EXCEPT
;
37 __asm__ ("fldcw %0" : : "m" (*&new_exc
));
39 /* If the CPU supports SSE we set the MXCSR as well. */
40 if (CPU_FEATURE_USABLE (SSE
))
42 unsigned int xnew_exc
;
44 /* Get the current control word. */
45 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc
));
47 xnew_exc
|= excepts
<< 7;
49 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc
));