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56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* Install given floating-point environment and raise exceptions.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>, 2000
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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 <string.h>
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int
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__feupdateenv (const fenv_t *envp)
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{
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union { unsigned long long l; unsigned int sw[2]; } s;
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fenv_t temp;
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/* Get the current exception status */
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__asm__ ("fstd %%fr0,0(%1) \n\t"
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"fldd 0(%1),%%fr0 \n\t"
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: "=m" (s.l) : "r" (&s.l));
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/* Given environment with exception flags not cleared. */
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if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
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{
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memcpy(&temp, envp, sizeof(fenv_t));
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temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27);
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}
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/* Default environment with exception flags not cleared. */
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if (envp == FE_DFL_ENV)
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temp.__status_word = s.sw[0] & (FE_ALL_EXCEPT << 27);
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/* All traps enabled and current exception flags not cleared. */
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if (envp == FE_NOMASK_ENV)
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temp.__status_word = (s.sw[0] & (FE_ALL_EXCEPT << 27)) | FE_ALL_EXCEPT;
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/* Install new environment. */
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__fesetenv (&temp);
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/* Success. */
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return 0;
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}
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libm_hidden_def (__feupdateenv)
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weak_alias (__feupdateenv, feupdateenv)
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libm_hidden_weak (feupdateenv)
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