neg.c
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上传日期:2022-08-06
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文件大小:1k
- /* mpf_neg -- Negate a float.
- Copyright 1993, 1994, 1995, 2001 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 Lesser General Public License as published by
- the Free Software Foundation; either version 3 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpf_neg (mpf_ptr r, mpf_srcptr u)
- {
- 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;
- }