53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
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/* Store current floating-point environment and clear exceptions.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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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__feholdexcept (fenv_t *envp)
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{
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union { unsigned long long buf[4]; fenv_t env; } clear;
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unsigned long long *bufptr;
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/* Store the environment. */
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bufptr = clear.buf;
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__asm__ (
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"fstd %%fr0,0(%1)\n"
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: "=m" (clear) : "r" (bufptr) : "%r0");
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memcpy (envp, &clear.env, sizeof (fenv_t));
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/* Clear exception queues */
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memset (clear.env.__exception, 0, sizeof (clear.env.__exception));
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/* And set all exceptions to non-stop. */
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clear.env.__status_word &= ~FE_ALL_EXCEPT;
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/* Now clear all flags */
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clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27);
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/* Load the new environment. Note: fr0 must load last to enable T-bit. */
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__asm__ (
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"fldd 0(%0),%%fr0\n"
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: : "r" (bufptr), "m" (clear) : "%r0");
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return 0;
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}
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libm_hidden_def (__feholdexcept)
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weak_alias (__feholdexcept, feholdexcept)
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libm_hidden_weak (feholdexcept)
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