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39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/* Set current rounding direction.
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Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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unsigned short int cw;
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if ((round & ~0xc00) != 0)
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/* ROUND is no valid rounding mode. */
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return 0;
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__asm__ ("fnstcw %0" : "=m" (*&cw));
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cw &= ~0xc00;
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cw |= round;
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__asm__ ("fldcw %0" : : "m" (*&cw));
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return 1;
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}
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