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1 | /* Set the FPU control word. | |
2 | Copyright (C) 1996-2021 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 | } |