| /* Install given floating-point environment and raise exceptions. |
| Copyright (C) 2000-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David Huggins-Daines <dhd@debian.org>, 2000 |
| |
| 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.h> |
| #include <string.h> |
| |
| int |
| __feupdateenv (const fenv_t *envp) |
| { |
| union { unsigned long long l; unsigned int sw[2]; } s; |
| fenv_t temp; |
| /* Get the current exception status */ |
| __asm__ ("fstd %%fr0,0(%1) \n\t" |
| "fldd 0(%1),%%fr0 \n\t" |
| : "=m" (s.l) : "r" (&s.l)); |
| |
| /* Given environment with exception flags not cleared. */ |
| if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
| { |
| memcpy(&temp, envp, sizeof(fenv_t)); |
| temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27); |
| } |
| |
| /* Default environment with exception flags not cleared. */ |
| if (envp == FE_DFL_ENV) |
| temp.__status_word = s.sw[0] & (FE_ALL_EXCEPT << 27); |
| |
| /* All traps enabled and current exception flags not cleared. */ |
| if (envp == FE_NOMASK_ENV) |
| temp.__status_word = (s.sw[0] & (FE_ALL_EXCEPT << 27)) | FE_ALL_EXCEPT; |
| |
| /* Install new environment. */ |
| __fesetenv (&temp); |
| /* Success. */ |
| return 0; |
| } |
| libm_hidden_def (__feupdateenv) |
| weak_alias (__feupdateenv, feupdateenv) |
| libm_hidden_weak (feupdateenv) |
