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