1 | /* Set floating-point environment exception handling. |
2 | Copyright (C) 2000-2024 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_libc.h> |
20 | #include <math.h> |
21 | #include <fpu_control.h> |
22 | |
23 | int |
24 | fesetexceptflag (const fexcept_t *flagp, int excepts) |
25 | { |
26 | fexcept_t fpc, fpc_new; |
27 | |
28 | /* Get the current environment. We have to do this since we cannot |
29 | separately set the status word. */ |
30 | _FPU_GETCW (fpc); |
31 | |
32 | /* Clear the current exception bits. */ |
33 | fpc_new = fpc & ~((excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT); |
34 | if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0) |
35 | /* Bits 6, 7 of dxc-byte are zero, |
36 | thus bits 0-5 of dxc-byte correspond to the flag-bits. |
37 | Clear given exceptions in dxc-field. */ |
38 | fpc_new &= ~((excepts & FE_ALL_EXCEPT) << FPC_DXC_SHIFT); |
39 | |
40 | /* Set exceptions from flagp in flags-field. */ |
41 | fpc_new |= (*flagp & excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT; |
42 | |
43 | /* Store the new status word (along with the rest of the environment. |
44 | Possibly new exceptions are set but they won't get executed. */ |
45 | _FPU_SETCW (fpc_new); |
46 | |
47 | /* Success. */ |
48 | return 0; |
49 | } |
50 | |