1 /* Clear given exceptions in current floating-point environment.
2 Copyright (C) 1998-2025 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <fenv.h>
19 #include "fenv_libc.h"
20 #include <fpu_control.h>
21
22 int
feclearexcept(int excepts)23 feclearexcept (int excepts)
24 {
25 int cw;
26
27 /* Mask out unsupported bits/exceptions. */
28 excepts &= FE_ALL_EXCEPT;
29
30 /* Read the complete control word. */
31 _FPU_GETCW (cw);
32
33 /* Clear exception flag bits and cause bits. If the cause bit is not
34 cleared, the next CTC instruction (just below) will re-generate the
35 exception. */
36
37 cw &= ~(excepts | (excepts << CAUSE_SHIFT));
38
39 /* Put the new data in effect. */
40 _FPU_SETCW (cw);
41
42 /* Success. */
43 return 0;
44 }
45