1 | /* Install given floating-point control modes. ARM version. |
2 | Copyright (C) 2016-2022 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.h> |
20 | #include <fpu_control.h> |
21 | #include <arm-features.h> |
22 | |
23 | /* NZCV flags, QC bit, IDC bit and bits for IEEE exception status. */ |
24 | #define FPU_STATUS_BITS 0xf800009f |
25 | |
26 | int |
27 | fesetmode (const femode_t *modep) |
28 | { |
29 | fpu_control_t fpscr, new_fpscr; |
30 | |
31 | if (!ARM_HAVE_VFP) |
32 | /* Nothing to do. */ |
33 | return 0; |
34 | |
35 | _FPU_GETCW (fpscr); |
36 | if (modep == FE_DFL_MODE) |
37 | new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT; |
38 | else |
39 | new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS); |
40 | |
41 | if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) |
42 | _FPU_SETCW (new_fpscr); |
43 | |
44 | return 0; |
45 | } |
46 | |