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f10eff58 | 1 | /* Install given floating-point environment. |
2b778ceb | 2 | Copyright (C) 2004-2021 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 | ||
22423683 | 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 | 18 | |
18f8524d | 19 | #include <fenv.h> |
a3dd035d | 20 | #include <fpu_control.h> |
a4ca5195 | 21 | #include <arm-features.h> |
f10eff58 | 22 | |
f10eff58 DJ |
23 | |
24 | int | |
cd42798a | 25 | __fesetenv (const fenv_t *envp) |
f10eff58 | 26 | { |
b8c00573 | 27 | fpu_control_t fpscr, new_fpscr, updated_fpscr; |
18f8524d | 28 | |
1a2f40e5 W |
29 | /* Fail if a VFP unit isn't present. */ |
30 | if (!ARM_HAVE_VFP) | |
31 | return 1; | |
32 | ||
18f8524d | 33 | _FPU_GETCW (fpscr); |
1a2f40e5 | 34 | |
b8c00573 W |
35 | if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
36 | { | |
37 | /* The new FPSCR is valid, so don't merge the reserved flags. */ | |
38 | new_fpscr = envp->__cw; | |
1a2f40e5 | 39 | |
b8c00573 W |
40 | /* Write new FPSCR if different (ignoring NZCV flags). */ |
41 | if (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0) | |
42 | _FPU_SETCW (new_fpscr); | |
1a2f40e5 | 43 | |
b8c00573 W |
44 | return 0; |
45 | } | |
1a2f40e5 | 46 | |
b8c00573 W |
47 | /* Preserve the reserved FPSCR flags. */ |
48 | new_fpscr = fpscr & _FPU_RESERVED; | |
49 | new_fpscr |= (envp == FE_DFL_ENV) ? _FPU_DEFAULT : _FPU_IEEE; | |
50 | ||
51 | if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) | |
18f8524d | 52 | { |
b8c00573 W |
53 | _FPU_SETCW (new_fpscr); |
54 | ||
18f8524d MS |
55 | /* Not all VFP architectures support trapping exceptions, so |
56 | test whether the relevant bits were set and fail if not. */ | |
b8c00573 W |
57 | _FPU_GETCW (updated_fpscr); |
58 | ||
59 | return new_fpscr & ~updated_fpscr; | |
f10eff58 DJ |
60 | } |
61 | ||
1a2f40e5 | 62 | return 0; |
f10eff58 | 63 | } |
cd42798a JM |
64 | libm_hidden_def (__fesetenv) |
65 | weak_alias (__fesetenv, fesetenv) | |
66 | libm_hidden_weak (fesetenv) |