freebsd-dev/contrib/libgmp/mpf/neg.c
Mark Murray aa9bc17601 Clean import of libgmp 2.0.2, with only the non-x86 bits removed.
BMakefiles and other bits will follow.

Requested by:	Andrey Chernov
Made world by:	Chuck Robey
1996-10-20 08:49:26 +00:00

60 lines
1.5 KiB
C

/* mpf_neg -- Negate a float.
Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The GNU MP 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include "gmp.h"
#include "gmp-impl.h"
void
#if __STDC__
mpf_neg (mpf_ptr r, mpf_srcptr u)
#else
mpf_neg (r, u)
mpf_ptr r;
mpf_srcptr u;
#endif
{
mp_size_t size;
size = -u->_mp_size;
if (r != u)
{
mp_size_t prec;
mp_size_t asize;
mp_ptr rp, up;
prec = r->_mp_prec + 1; /* lie not to lose precision in assignment */
asize = ABS (size);
rp = r->_mp_d;
up = u->_mp_d;
if (asize > prec)
{
up += asize - prec;
asize = prec;
}
MPN_COPY (rp, up, asize);
r->_mp_exp = u->_mp_exp;
size = size >= 0 ? asize : -asize;
}
r->_mp_size = size;
}