1 /* Store current floating-point environment and clear exceptions.
2 Copyright (C) 1997-2018 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 <http://www.gnu.org/licenses/>. */
19 #include <fenv_libc.h>
20 #include <fpu_control.h>
21 #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_XM | _FPU_MASK_IM)
24 __feholdexcept (fenv_t
*envp
)
26 fenv_union_t old
, new;
28 /* Save the currently set exceptions. */
29 old
.fenv
= *envp
= fegetenv_register ();
31 /* Clear everything except for the rounding modes and non-IEEE arithmetic
33 new.l
= old
.l
& 0xffffffff00000007LL
;
38 /* If the old env had any enabled exceptions, then mask SIGFPE in the
39 MSR FE0/FE1 bits. This may allow the FPU to run faster because it
40 always takes the default action and can not generate SIGFPE. */
41 if ((old
.l
& _FPU_MASK_ALL
) != 0)
42 (void)__fe_mask_env ();
44 /* Put the new state in effect. */
45 fesetenv_register (new.fenv
);
49 libm_hidden_def (__feholdexcept
)
50 weak_alias (__feholdexcept
, feholdexcept
)
51 libm_hidden_weak (feholdexcept
)