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Annotation of OpenXM_contrib/gmp/mpf/reldiff.c, Revision 1.1.1.1

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: