1 | /* Set current rounding direction. |
2 | Copyright (C) 1997-2024 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 | |
21 | int |
22 | __fesetround (int round) |
23 | { |
24 | unsigned long fpcr; |
25 | |
26 | if (round & ~3) |
27 | return 1; |
28 | |
29 | /* Get the current state. */ |
30 | __asm__ __volatile__("excb; mf_fpcr %0" : "=f" (fpcr)); |
31 | |
32 | /* Set the relevant bits. */ |
33 | fpcr = ((fpcr & ~FPCR_ROUND_MASK) |
34 | | ((unsigned long)round << FPCR_ROUND_SHIFT)); |
35 | |
36 | /* Put the new state in effect. */ |
37 | __asm__ __volatile__("mt_fpcr %0; excb" : : "f" (fpcr)); |
38 | |
39 | return 0; |
40 | } |
41 | libm_hidden_def (__fesetround) |
42 | weak_alias (__fesetround, fesetround) |
43 | libm_hidden_weak (fesetround) |
44 | |