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f10eff58 | 1 | /* Set the FPU control word. |
04277e02 | 2 | Copyright (C) 1996-2019 Free Software Foundation, Inc. |
f10eff58 DJ |
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 | |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
f10eff58 DJ |
18 | |
19 | #include <math.h> | |
20 | #include <fpu_control.h> | |
a4ca5195 | 21 | #include <arm-features.h> |
f10eff58 | 22 | |
f10eff58 DJ |
23 | |
24 | void | |
25 | __setfpucw (fpu_control_t set) | |
26 | { | |
001f7b77 | 27 | fpu_control_t fpscr, new_fpscr; |
f10eff58 | 28 | |
1a2f40e5 W |
29 | /* Do nothing if a VFP unit isn't present. */ |
30 | if (!ARM_HAVE_VFP) | |
31 | return; | |
f10eff58 | 32 | |
1a2f40e5 | 33 | _FPU_GETCW (fpscr); |
f10eff58 | 34 | |
1a2f40e5 W |
35 | /* Preserve the reserved bits, and set the rest as the user |
36 | specified (or the default, if the user gave zero). */ | |
001f7b77 W |
37 | new_fpscr = fpscr & _FPU_RESERVED; |
38 | new_fpscr |= set & ~_FPU_RESERVED; | |
f10eff58 | 39 | |
001f7b77 W |
40 | /* Write FPSCR if changed. */ |
41 | if (new_fpscr != fpscr) | |
42 | _FPU_SETCW (fpscr); | |
f10eff58 | 43 | } |