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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
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/* mpfr_neg -- change the sign of a floating-point number
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Copyright 1999, 2000, 2001, 2004, 2006, 2007 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the MPFR Library.
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Contributed by the Spaces project (LORIA/LIP6).
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The MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPFR Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "mpfr-impl.h"
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int
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mpfr_neg (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode)
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{
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if (MPFR_UNLIKELY(a != b))
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return mpfr_set4 (a, b, rnd_mode, -MPFR_SIGN(b));
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else if (MPFR_UNLIKELY(MPFR_IS_NAN (b)))
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{
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MPFR_RET_NAN;
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}
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else
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{
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MPFR_CHANGE_SIGN(a);
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MPFR_RET(0);
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}
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}
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