1 /* Clear given exceptions in current floating-point environment.
2 Copyright (C) 2000-2022 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
21 int
feclearexcept(int excepts)22 feclearexcept (int excepts)
23 {
24 union { unsigned long long l; unsigned int sw[2]; } s;
25
26 /* Get the current status word. */
27 __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0");
28 /* Clear all the relevant bits. */
29 s.sw[0] &= ~((excepts & FE_ALL_EXCEPT) << 27);
30 __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0");
31
32 /* Success. */
33 return 0;
34 }
35 libm_hidden_def (feclearexcept)
36