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/* mpfr_reldiff -- compute relative difference of two floating-point numbers.
Copyright (C) 2000 PolKA project, Inria Lorraine and Loria
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
/* reldiff(b, c) = abs(b-c)/b */
void
#if __STDC__
mpfr_reldiff(mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mp_rnd_t rnd_mode)
#else
mpfr_reldiff(a, b, c, rnd_mode)
mpfr_ptr a;
mpfr_srcptr b;
mpfr_srcptr c;
mp_rnd_t rnd_mode;
#endif
{
if (FLAG_NAN(b) || FLAG_NAN(c)) { SET_NAN(a); return; }
if (!NOTZERO(b)) /* reldiff = abs(c)/c = sign(c) */
mpfr_set_ui(a, MPFR_SIGN(c), rnd_mode);
else {
mp_rnd_t rnd1;
mpfr_sub(a, b, c, rnd_mode);
mpfr_abs(a, a, rnd_mode); /* for compatibility with MPF */
mpfr_div(a, a, b, rnd_mode);
}
}
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