arb/arf/cmpabs.c
2016-10-25 21:57:37 +02:00

70 lines
1.5 KiB
C

/*
Copyright (C) 2014 Fredrik Johansson
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "arf.h"
int
arf_cmpabs(const arf_t x, const arf_t y)
{
int ec, mc;
mp_size_t xn, yn;
mp_srcptr xp, yp;
if (arf_is_special(x) || arf_is_special(y))
{
if (arf_equal(x, y))
return 0;
if (arf_is_nan(x) || arf_is_nan(y))
return 0;
if (arf_is_zero(x)) return -1;
if (arf_is_zero(y)) return 1;
if (arf_is_inf(x)) return arf_is_inf(y) ? 0 : 1;
if (arf_is_inf(y)) return -1;
return -1;
}
ec = fmpz_cmp(ARF_EXPREF(x), ARF_EXPREF(y));
if (ec != 0)
return (ec < 0) ? -1 : 1;
ARF_GET_MPN_READONLY(xp, xn, x);
ARF_GET_MPN_READONLY(yp, yn, y);
if (xn >= yn)
mc = mpn_cmp(xp + xn - yn, yp, yn);
else
mc = mpn_cmp(xp, yp + yn - xn, xn);
if (mc != 0)
return (mc < 0) ? -1 : 1;
if (xn != yn)
return (xn < yn) ? -1 : 1;
return 0;
}
int arf_cmpabs_ui(const arf_t x, ulong y)
{
arf_t t;
arf_init_set_ui(t, y); /* no need to free */
return arf_cmpabs(x, t);
}
int arf_cmpabs_d(const arf_t x, double y)
{
arf_t t;
arf_init(t); /* no need to free */
arf_set_d(t, y);
return arf_cmpabs(x, t);
}