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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Store current floating-point environment and clear exceptions.
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Copyright (C) 1997, 1999, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <fenv.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <dl-procinfo.h>
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int
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feholdexcept (fenv_t *envp)
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{
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unsigned short int work;
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/* Store the environment. */
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__asm__ ("fnstenv %0" : "=m" (*envp));
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/* Now set all exceptions to non-stop. */
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work = envp->__control_word | 0x3f;
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__asm__ ("fldcw %0" : : "m" (*&work));
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/* If the CPU supports SSE we set the MXCSR as well. */
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if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
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{
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unsigned int xwork;
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/* Get the current control word. */
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__asm__ ("stmxcsr %0" : "=m" (*&xwork));
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/* Set all exceptions to non-stop. */
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xwork |= 0x1f80;
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__asm__ ("ldmxcsr %0" : : "m" (*&xwork));
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}
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return 0;
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}
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