/* Clear given exceptions in current floating-point environment. Copyright (C) 1997,99,2000, 2001, 2003, 2004 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 feclearexcept (int excepts) { fenv_t temp; /* Mask out unsupported bits/exceptions. */ excepts &= FE_ALL_EXCEPT; /* Bah, we have to clear selected exceptions. Since there is no `fldsw' instruction we have to do it the hard way. */ __asm__ ("fnstenv %0" : "=m" (*&temp)); /* Clear the relevant bits. */ temp.__status_word &= excepts ^ FE_ALL_EXCEPT; /* Put the new data in effect. */ __asm__ ("fldenv %0" : : "m" (*&temp)); #if 0 /* If the CPU supports SSE, we clear the MXCSR as well. */ if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) { unsigned int xnew_exc; /* Get the current MXCSR. */ __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); /* Clear the relevant bits. */ xnew_exc &= ~excepts; /* Put the new data in effect. */ __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); } #endif /* Success. */ return 0; }