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Annotation of OpenXM_contrib/gmp/mpf/neg.c, Revision 1.1

1.1     ! maekawa     1: /* mpf_neg -- Negate a float.
        !             2:
        !             3: Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
        !             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
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            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
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            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: #if __STDC__
        !            27: mpf_neg (mpf_ptr r, mpf_srcptr u)
        !            28: #else
        !            29: mpf_neg (r, u)
        !            30:      mpf_ptr r;
        !            31:      mpf_srcptr u;
        !            32: #endif
        !            33: {
        !            34:   mp_size_t size;
        !            35:
        !            36:   size = -u->_mp_size;
        !            37:   if (r != u)
        !            38:     {
        !            39:       mp_size_t prec;
        !            40:       mp_size_t asize;
        !            41:       mp_ptr rp, up;
        !            42:
        !            43:       prec = r->_mp_prec + 1;  /* lie not to lose precision in assignment */
        !            44:       asize = ABS (size);
        !            45:       rp = r->_mp_d;
        !            46:       up = u->_mp_d;
        !            47:
        !            48:       if (asize > prec)
        !            49:        {
        !            50:          up += asize - prec;
        !            51:          asize = prec;
        !            52:        }
        !            53:
        !            54:       MPN_COPY (rp, up, asize);
        !            55:       r->_mp_exp = u->_mp_exp;
        !            56:       size = size >= 0 ? asize : -asize;
        !            57:     }
        !            58:   r->_mp_size = size;
        !            59: }