1 /* Install given floating-point environment.
2 Copyright (C) 2004-2020 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/>. */
20 #include <fpu_control.h>
21 #include <arm-features.h>
25 __fesetenv (const fenv_t
*envp
)
27 fpu_control_t fpscr
, new_fpscr
, updated_fpscr
;
29 /* Fail if a VFP unit isn't present. */
35 if ((envp
!= FE_DFL_ENV
) && (envp
!= FE_NOMASK_ENV
))
37 /* The new FPSCR is valid, so don't merge the reserved flags. */
38 new_fpscr
= envp
->__cw
;
40 /* Write new FPSCR if different (ignoring NZCV flags). */
41 if (((fpscr
^ new_fpscr
) & ~_FPU_MASK_NZCV
) != 0)
42 _FPU_SETCW (new_fpscr
);
47 /* Preserve the reserved FPSCR flags. */
48 new_fpscr
= fpscr
& _FPU_RESERVED
;
49 new_fpscr
|= (envp
== FE_DFL_ENV
) ? _FPU_DEFAULT
: _FPU_IEEE
;
51 if (((new_fpscr
^ fpscr
) & ~_FPU_MASK_NZCV
) != 0)
53 _FPU_SETCW (new_fpscr
);
55 /* Not all VFP architectures support trapping exceptions, so
56 test whether the relevant bits were set and fail if not. */
57 _FPU_GETCW (updated_fpscr
);
59 return new_fpscr
& ~updated_fpscr
;
64 libm_hidden_def (__fesetenv
)
65 weak_alias (__fesetenv
, fesetenv
)
66 libm_hidden_weak (fesetenv
)