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

1.1       maekawa     1: /* mpf_reldiff -- Generate the relative difference of two floats.
                      2:
1.1.1.3 ! ohara       3: Copyright 1996, 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_reldiff (mpf_t rdiff, mpf_srcptr x, mpf_srcptr y)
                     27: {
                     28:   if (mpf_cmp_ui (x, 0) == 0)
                     29:     {
                     30:       mpf_set_ui (rdiff, (unsigned long int) (mpf_sgn (y) != 0));
                     31:     }
                     32:   else
                     33:     {
                     34:       mpf_t d;
                     35:       mp_limb_t tmp_limb[2];
                     36:
                     37:       d->_mp_prec = 1;
                     38:       d->_mp_d = tmp_limb;
                     39:
                     40:       mpf_sub (d, x, y);
                     41:       mpf_abs (d, d);
                     42:       mpf_div (rdiff, d, x);
                     43:     }
                     44: }
                     45: