1 | /* Set the FPU control word. |
2 | Copyright (C) 1996-2024 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 <math.h> |
20 | #include <fpu_control.h> |
21 | #include <arm-features.h> |
22 | |
23 | |
24 | void |
25 | __setfpucw (fpu_control_t set) |
26 | { |
27 | fpu_control_t fpscr, new_fpscr; |
28 | |
29 | /* Do nothing if a VFP unit isn't present. */ |
30 | if (!ARM_HAVE_VFP) |
31 | return; |
32 | |
33 | _FPU_GETCW (fpscr); |
34 | |
35 | /* Preserve the reserved bits, and set the rest as the user |
36 | specified (or the default, if the user gave zero). */ |
37 | new_fpscr = fpscr & _FPU_RESERVED; |
38 | new_fpscr |= set & ~_FPU_RESERVED; |
39 | |
40 | /* Write FPSCR if changed. */ |
41 | if (new_fpscr != fpscr) |
42 | _FPU_SETCW (fpscr); |
43 | } |
44 | |