aa9bc17601
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
60 lines
1.5 KiB
C
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;
|
|
}
|