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2b778ceb | 1 | /* Copyright (C) 2009-2021 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 | |
8116321f | 23 | __feupdateenv (const fenv_t *envp) |
554066b8 | 24 | { |
c95b3011 W |
25 | fpu_control_t fpcr; |
26 | fpu_control_t fpcr_new; | |
27 | fpu_control_t updated_fpcr; | |
554066b8 | 28 | fpu_fpsr_t fpsr; |
c95b3011 W |
29 | fpu_fpsr_t fpsr_new; |
30 | int excepts; | |
554066b8 | 31 | |
c95b3011 | 32 | _FPU_GETCW (fpcr); |
554066b8 | 33 | _FPU_GETFPSR (fpsr); |
c95b3011 | 34 | excepts = fpsr & FE_ALL_EXCEPT; |
554066b8 | 35 | |
c95b3011 W |
36 | if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
37 | { | |
38 | fpcr_new = envp->__fpcr; | |
39 | fpsr_new = envp->__fpsr | excepts; | |
554066b8 | 40 | |
c95b3011 W |
41 | if (fpcr != fpcr_new) |
42 | _FPU_SETCW (fpcr_new); | |
43 | ||
44 | if (fpsr != fpsr_new) | |
45 | _FPU_SETFPSR (fpsr_new); | |
46 | ||
47 | if (excepts & (fpcr_new >> FE_EXCEPT_SHIFT)) | |
0747f818 | 48 | return __feraiseexcept (excepts); |
c95b3011 W |
49 | |
50 | return 0; | |
51 | } | |
52 | ||
53 | fpcr_new = fpcr & _FPU_RESERVED; | |
54 | fpsr_new = fpsr & (_FPU_FPSR_RESERVED | FE_ALL_EXCEPT); | |
55 | ||
56 | if (envp == FE_DFL_ENV) | |
57 | { | |
58 | fpcr_new |= _FPU_DEFAULT; | |
59 | fpsr_new |= _FPU_FPSR_DEFAULT; | |
60 | } | |
61 | else | |
62 | { | |
63 | fpcr_new |= _FPU_FPCR_IEEE; | |
64 | fpsr_new |= _FPU_FPSR_IEEE; | |
65 | } | |
66 | ||
67 | _FPU_SETFPSR (fpsr_new); | |
68 | ||
69 | if (fpcr != fpcr_new) | |
70 | { | |
71 | _FPU_SETCW (fpcr_new); | |
72 | ||
73 | /* Trapping exceptions are optional in AArch64; the relevant enable | |
74 | bits in FPCR are RES0 hence the absence of support can be detected | |
75 | by reading back the FPCR and comparing with the required value. */ | |
76 | _FPU_GETCW (updated_fpcr); | |
77 | ||
78 | if (fpcr_new & ~updated_fpcr) | |
79 | return 1; | |
80 | } | |
81 | ||
82 | if (excepts & (fpcr_new >> FE_EXCEPT_SHIFT)) | |
0747f818 | 83 | return __feraiseexcept (excepts); |
554066b8 MS |
84 | |
85 | return 0; | |
86 | } | |
8116321f JM |
87 | libm_hidden_def (__feupdateenv) |
88 | weak_alias (__feupdateenv, feupdateenv) | |
89 | libm_hidden_weak (feupdateenv) |