/* Store current floating-point environment and clear exceptions. Copyright (C) 1997, 1999, 2003, 2004, 2005, 2007 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> int feholdexcept (fenv_t *envp) { fenv_t temp; /* Store the environment. */ __asm__ ("fnstenv %0" : "=m" (temp)); *envp = temp; /* Now set all exceptions to non-stop. */ temp.__control_word |= 0x3f; /* And clear all exceptions. */ temp.__status_word &= ~0x3f; __asm__ ("fldenv %0" : : "m" (temp)); #if 0 /* 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)); } #endif return 0; }