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/*
Copyright 2012, 2013 Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
The GNU MP Library test suite 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 General
Public License for more details.
You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include "testutils.h"
#define MAXBITS 400
#define COUNT 10000
/* Called when s is supposed to be floor(root(u,z)), and r = u - s^z */
static int
rootrem_valid_p (const mpz_t u, const mpz_t s, const mpz_t r, unsigned long z)
{
mpz_t t;
mpz_init (t);
if (mpz_fits_ulong_p (s))
mpz_ui_pow_ui (t, mpz_get_ui (s), z);
else
mpz_pow_ui (t, s, z);
mpz_sub (t, u, t);
if ((mpz_sgn (t) != mpz_sgn(u) && mpz_sgn (t) != 0) || mpz_cmp (t, r) != 0)
{
mpz_clear (t);
return 0;
}
if (mpz_sgn (s) > 0)
mpz_add_ui (t, s, 1);
else
mpz_sub_ui (t, s, 1);
mpz_pow_ui (t, t, z);
if (mpz_cmpabs (t, u) <= 0)
{
mpz_clear (t);
return 0;
}
mpz_clear (t);
return 1;
}
void
testmain (int argc, char **argv)
{
unsigned i;
unsigned long e;
mpz_t u, s, r, bs;
mpz_init (u);
mpz_init (s);
mpz_init (r);
mpz_init (bs);
for (i = 0; i < COUNT; i++)
{
mini_rrandomb (u, MAXBITS);
mini_rrandomb (bs, 12);
e = mpz_getlimbn (bs, 0) % mpz_sizeinbase (u, 2) + 1;
if ((e & 1) && (mpz_getlimbn (bs, 0) & (1L<<10)))
mpz_neg (u, u);
mpz_rootrem (s, r, u, e);
if (!rootrem_valid_p (u, s, r, e))
{
fprintf (stderr, "mpz_rootrem(%lu-th) failed:\n", e);
dump ("u", u);
dump ("root", s);
dump ("rem", r);
abort ();
}
}
mpz_clear (bs);
mpz_clear (u);
mpz_clear (s);
mpz_clear (r);
}
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