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43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* Set current rounding direction.
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Copyright (C) 2000-2018 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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int
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__fesetround (int round)
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{
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union { unsigned long long l; unsigned int sw[2]; } s;
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if (round & ~FE_DOWNWARD)
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/* round is not a valid rounding mode. */
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return 1;
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/* Get the current status word. */
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__asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0");
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s.sw[0] &= ~FE_DOWNWARD;
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s.sw[0] |= round & FE_DOWNWARD;
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__asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0");
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return 0;
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}
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libm_hidden_def (__fesetround)
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weak_alias (__fesetround, fesetround)
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libm_hidden_weak (fesetround)
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