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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* Clear given exceptions in current floating-point environment.
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Copyright (C) 1997-2015 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, see
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<http://www.gnu.org/licenses/>. */
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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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__feclearexcept (int excepts)
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{
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fenv_t temp;
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/* Mask out unsupported bits/exceptions. */
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excepts &= FE_ALL_EXCEPT;
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/* Bah, we have to clear selected exceptions. Since there is no
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`fldsw' instruction we have to do it the hard way. */
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__asm__ ("fnstenv %0" : "=m" (*&temp));
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/* Clear the relevant bits. */
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temp.__status_word &= excepts ^ FE_ALL_EXCEPT;
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/* Put the new data in effect. */
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__asm__ ("fldenv %0" : : "m" (*&temp));
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/* If the CPU supports SSE, we clear 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 xnew_exc;
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/* Get the current MXCSR. */
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__asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
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/* Clear the relevant bits. */
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xnew_exc &= ~excepts;
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/* Put the new data in effect. */
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__asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
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}
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/* Success. */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__feclearexcept, __old_feclearexcept)
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compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feclearexcept, feclearexcept)
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versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);
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