/* Store current floating-point environment and clear exceptions. Copyright (C) 1997-2018 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 (HAS_CPU_FEATURE (SSE)) { unsigned int xwork; /* Get the current control word. */ __asm__ ("stmxcsr %0" : "=m" (envp->__eip)); /* Set all exceptions to non-stop and clear them. */ xwork = (envp->__eip | 0x1f80) & ~0x3f; __asm__ ("ldmxcsr %0" : : "m" (*&xwork)); } return 0; } libm_hidden_def (__feholdexcept) weak_alias (__feholdexcept, feholdexcept) libm_hidden_weak (feholdexcept)