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60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Install given floating-point environment and raise exceptions.
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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 <dl-procinfo.h>
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#include <ldsodefs.h>
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int
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__feupdateenv (const fenv_t *envp)
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{
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fexcept_t temp;
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unsigned int xtemp = 0;
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/* Save current exceptions. */
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__asm__ ("fnstsw %0" : "=m" (*&temp));
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/* If the CPU supports SSE we test the MXCSR as well. */
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if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
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__asm__ ("stmxcsr %0" : "=m" (*&xtemp));
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temp = (temp | xtemp) & FE_ALL_EXCEPT;
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/* Install new environment. */
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fesetenv (envp);
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/* Raise the saved exception. Incidently for us the implementation
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defined format of the values in objects of type fexcept_t is the
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same as the ones specified using the FE_* constants. */
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__feraiseexcept ((int) temp);
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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 (__feupdateenv, __old_feupdateenv)
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compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feupdateenv, feupdateenv)
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versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);
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