| /* Store current floating-point environment and clear 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 |
| __feholdexcept (fenv_t *envp) |
| { |
| union { unsigned long long buf[4]; fenv_t env; } clear; |
| unsigned long long *bufptr; |
| |
| /* Store the environment. */ |
| bufptr = clear.buf; |
| __asm__ ( |
| "fstd %%fr0,0(%1)\n" |
| : "=m" (clear) : "r" (bufptr) : "%r0"); |
| memcpy (envp, &clear.env, sizeof (fenv_t)); |
| |
| /* Clear exception queues */ |
| memset (clear.env.__exception, 0, sizeof (clear.env.__exception)); |
| /* And set all exceptions to non-stop. */ |
| clear.env.__status_word &= ~FE_ALL_EXCEPT; |
| /* Now clear all flags */ |
| clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27); |
| |
| /* Load the new environment. Note: fr0 must load last to enable T-bit. */ |
| __asm__ ( |
| "fldd 0(%0),%%fr0\n" |
| : : "r" (bufptr), "m" (clear) : "%r0"); |
| |
| return 0; |
| } |
| |
| libm_hidden_def (__feholdexcept) |
| weak_alias (__feholdexcept, feholdexcept) |
| libm_hidden_weak (feholdexcept) |
