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d614a753 | 1 | /* Copyright (C) 1997-2020 Free Software Foundation, Inc. |
554066b8 MS |
2 | |
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 License as | |
7 | published by the Free Software Foundation; either version 2.1 of the | |
8 | 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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
554066b8 MS |
18 | |
19 | #include <fenv.h> | |
20 | #include <fpu_control.h> | |
21 | ||
22 | int | |
cd42798a | 23 | __fesetenv (const fenv_t *envp) |
554066b8 MS |
24 | { |
25 | fpu_control_t fpcr; | |
e5e0d9a4 | 26 | fpu_control_t fpcr_new; |
302949e2 | 27 | fpu_control_t updated_fpcr; |
e5e0d9a4 IB |
28 | fpu_fpsr_t fpsr; |
29 | fpu_fpsr_t fpsr_new; | |
554066b8 MS |
30 | |
31 | _FPU_GETCW (fpcr); | |
554066b8 | 32 | |
3136eb7a WD |
33 | if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
34 | { | |
35 | /* The new FPCR/FPSR are valid, so don't merge the reserved flags. */ | |
36 | fpcr_new = envp->__fpcr; | |
37 | ||
38 | if (fpcr != fpcr_new) | |
39 | _FPU_SETCW (fpcr_new); | |
40 | ||
41 | _FPU_SETFPSR (envp->__fpsr); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | _FPU_GETFPSR (fpsr); | |
e5e0d9a4 IB |
46 | fpcr_new = fpcr & _FPU_RESERVED; |
47 | fpsr_new = fpsr & _FPU_FPSR_RESERVED; | |
554066b8 MS |
48 | |
49 | if (envp == FE_DFL_ENV) | |
50 | { | |
e5e0d9a4 IB |
51 | fpcr_new |= _FPU_DEFAULT; |
52 | fpsr_new |= _FPU_FPSR_DEFAULT; | |
554066b8 | 53 | } |
3136eb7a | 54 | else |
554066b8 | 55 | { |
e5e0d9a4 IB |
56 | fpcr_new |= _FPU_FPCR_IEEE; |
57 | fpsr_new |= _FPU_FPSR_IEEE; | |
554066b8 | 58 | } |
554066b8 | 59 | |
3136eb7a | 60 | _FPU_SETFPSR (fpsr_new); |
554066b8 | 61 | |
e5e0d9a4 | 62 | if (fpcr != fpcr_new) |
3136eb7a WD |
63 | { |
64 | _FPU_SETCW (fpcr_new); | |
554066b8 | 65 | |
3136eb7a WD |
66 | /* Trapping exceptions are optional in AArch64; the relevant enable |
67 | bits in FPCR are RES0 hence the absence of support can be detected | |
68 | by reading back the FPCR and comparing with the required value. */ | |
69 | _FPU_GETCW (updated_fpcr); | |
302949e2 | 70 | |
3136eb7a WD |
71 | return fpcr_new & ~updated_fpcr; |
72 | } | |
302949e2 | 73 | |
554066b8 MS |
74 | return 0; |
75 | } | |
cd42798a JM |
76 | libm_hidden_def (__fesetenv) |
77 | weak_alias (__fesetenv, fesetenv) | |
78 | libm_hidden_weak (fesetenv) |