| /* 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. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| |
| 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 <unistd.h> |
| #include <ldsodefs.h> |
| #include <dl-procinfo.h> |
| |
| int |
| feholdexcept (fenv_t *envp) |
| { |
| /* Store the environment. Recall that fnstenv has a side effect of |
| masking all exceptions. Then clear all exceptions. */ |
| __asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp)); |
| |
| /* If the CPU supports SSE we set the MXCSR as well. */ |
| if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) |
| { |
| unsigned int xwork; |
| |
| /* Get the current control word. */ |
| __asm__ ("stmxcsr %0" : "=m" (*&xwork)); |
| |
| /* Set all exceptions to non-stop and clear them. */ |
| xwork = (xwork | 0x1f80) & ~0x3f; |
| |
| __asm__ ("ldmxcsr %0" : : "m" (*&xwork)); |
| } |
| |
| return 0; |
| } |
| libm_hidden_def (feholdexcept) |
