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- /* 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;
- }
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