Return to neg.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpf

Annotation of OpenXM_contrib/gmp/mpf/neg.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpf_neg -- Negate a float.
                      2:
1.1.1.3 ! ohara       3: Copyright 1993, 1994, 1995, 2001 Free Software Foundation, Inc.
1.1       maekawa     4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa     8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2   maekawa    14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: License for more details.
                     16:
1.1.1.2   maekawa    17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24:
                     25: void
                     26: mpf_neg (mpf_ptr r, mpf_srcptr u)
                     27: {
                     28:   mp_size_t size;
                     29:
                     30:   size = -u->_mp_size;
                     31:   if (r != u)
                     32:     {
                     33:       mp_size_t prec;
                     34:       mp_size_t asize;
                     35:       mp_ptr rp, up;
                     36:
                     37:       prec = r->_mp_prec + 1;  /* lie not to lose precision in assignment */
                     38:       asize = ABS (size);
                     39:       rp = r->_mp_d;
                     40:       up = u->_mp_d;
                     41:
                     42:       if (asize > prec)
                     43:        {
                     44:          up += asize - prec;
                     45:          asize = prec;
                     46:        }
                     47:
                     48:       MPN_COPY (rp, up, asize);
                     49:       r->_mp_exp = u->_mp_exp;
                     50:       size = size >= 0 ? asize : -asize;
                     51:     }
                     52:   r->_mp_size = size;
                     53: }