1/* Install given floating-point environment and raise exceptions.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
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
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <fenv.h>
20#include <string.h>
21
22int
23__feupdateenv (const fenv_t *envp)
24{
25 union { unsigned long long l; unsigned int sw[2]; } s;
26 fenv_t temp;
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));
31
32 /* Given environment with exception flags not cleared. */
33 if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
34 {
35 memcpy(dest: &temp, src: envp, n: sizeof (fenv_t));
36 temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27);
37 }
38
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);
42
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;
46
47 /* Install new environment. */
48 __fesetenv (envp: &temp);
49 /* Success. */
50 return 0;
51}
52libm_hidden_def (__feupdateenv)
53weak_alias (__feupdateenv, feupdateenv)
54libm_hidden_weak (feupdateenv)
55

source code of glibc/sysdeps/hppa/fpu/feupdateenv.c