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

1.1     ! maekawa     1: /* mpf_reldiff -- Generate the relative difference of two floats.
        !             2:
        !             3: Copyright (C) 1996 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_reldiff (mpf_t rdiff, mpf_srcptr x, mpf_srcptr y)
        !            28: #else
        !            29: mpf_reldiff (rdiff, x, y)
        !            30:      mpf_t rdiff;
        !            31:      mpf_srcptr x;
        !            32:      mpf_srcptr y;
        !            33: #endif
        !            34: {
        !            35:   if (mpf_cmp_ui (x, 0) == 0)
        !            36:     {
        !            37:       mpf_set_ui (rdiff, (unsigned long int) (mpf_sgn (y) != 0));
        !            38:     }
        !            39:   else
        !            40:     {
        !            41:       mpf_t d;
        !            42:       mp_limb_t tmp_limb[2];
        !            43:
        !            44:       d->_mp_prec = 1;
        !            45:       d->_mp_d = tmp_limb;
        !            46:
        !            47:       mpf_sub (d, x, y);
        !            48:       mpf_abs (d, d);
        !            49:       mpf_div (rdiff, d, x);
        !            50:     }
        !            51: }
        !            52: