| /* Store current floating-point environment and clear exceptions. |
| Copyright (C) 1997-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <fenv_libc.h> |
| #include <fpu_control.h> |
| #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_XM | _FPU_MASK_IM) |
| |
| int |
| feholdexcept (fenv_t *envp) |
| { |
| fenv_union_t old, new; |
| |
| /* Save the currently set exceptions. */ |
| old.fenv = *envp = fegetenv_register (); |
| |
| /* Clear everything except for the rounding modes and non-IEEE arithmetic |
| flag. */ |
| new.l = old.l & 0xffffffff00000007LL; |
| |
| /* If the old env had any enabled exceptions, then mask SIGFPE in the |
| MSR FE0/FE1 bits. This may allow the FPU to run faster because it |
| always takes the default action and can not generate SIGFPE. */ |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void)__fe_mask_env (); |
| |
| /* Put the new state in effect. */ |
| fesetenv_register (new.fenv); |
| |
| return 0; |
| } |
| libm_hidden_def (feholdexcept) |
