1 /* Install given floating-point environment and raise exceptions.
2 Copyright (C) 2000-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
23 __feupdateenv (const fenv_t
*envp
)
25 union { unsigned long long l
; unsigned int sw
[2]; } s
;
27 /* Get the current exception status */
28 __asm__ ("fstd %%fr0,0(%1) \n\t"
29 "fldd 0(%1),%%fr0 \n\t"
30 : "=m" (s
.l
) : "r" (&s
.l
));
32 /* Given environment with exception flags not cleared. */
33 if ((envp
!= FE_DFL_ENV
) && (envp
!= FE_NOMASK_ENV
))
35 memcpy(&temp
, envp
, sizeof (fenv_t
));
36 temp
.__status_word
|= s
.sw
[0] & (FE_ALL_EXCEPT
<< 27);
39 /* Default environment with exception flags not cleared. */
40 if (envp
== FE_DFL_ENV
)
41 temp
.__status_word
= s
.sw
[0] & (FE_ALL_EXCEPT
<< 27);
43 /* All traps enabled and current exception flags not cleared. */
44 if (envp
== FE_NOMASK_ENV
)
45 temp
.__status_word
= (s
.sw
[0] & (FE_ALL_EXCEPT
<< 27)) | FE_ALL_EXCEPT
;
47 /* Install new environment. */
52 libm_hidden_def (__feupdateenv
)
53 weak_alias (__feupdateenv
, feupdateenv
)
54 libm_hidden_weak (feupdateenv
)