/* Set floating-point environment exception handling. Copyright (C) 1997,99,2000,01, 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 <math.h> #include <unistd.h> int fesetexceptflag (const fexcept_t *flagp, int excepts) { fenv_t temp; /* Get the current environment. We have to do this since we cannot separately set the status word. */ __asm__ ("fnstenv %0" : "=m" (*&temp)); temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; /* Store the new status word (along with the rest of the environment. Possibly new exceptions are set but they won't get executed unless the next floating-point instruction. */ __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 xnew_exc; /* Get the current MXCSR. */ __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); /* Set the relevant bits. */ xnew_exc &= ~(excepts & FE_ALL_EXCEPT); xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; /* Put the new data in effect. */ __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); } #endif /* Success. */ return 0; }