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45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Install given floating-point control modes. Alpha version.
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Copyright (C) 2016-2017 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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<http://www.gnu.org/licenses/>. */
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#include <fenv_libc.h>
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int
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fesetmode (const femode_t *modep)
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{
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unsigned long int fpcr;
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unsigned long int swcr;
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femode_t mode;
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/* As in fesetenv. */
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if ((long int) modep >= 0)
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mode = *modep;
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else
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mode = (unsigned long int) modep;
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__asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));
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fpcr = (fpcr & ~FPCR_ROUND_MASK) | (mode & FPCR_ROUND_MASK);
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__asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));
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swcr = __ieee_get_fp_control ();
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swcr = ((mode & SWCR_ALL_MASK & ~SWCR_STATUS_MASK)
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| (swcr & SWCR_STATUS_MASK));
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__ieee_set_fp_control (swcr);
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return 0;
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}
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