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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* Store current floating-point environment and clear 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 <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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/* Store the environment. Recall that fnstenv has a side effect of
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masking all exceptions. Then clear all exceptions. */
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__asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp));
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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" (envp->__eip));
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/* Set all exceptions to non-stop and clear them. */
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xwork = (envp->__eip | 0x1f80) & ~0x3f;
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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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libm_hidden_def (feholdexcept)
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