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/* Tests the (internal) function mpz_lucas_mod
Copyright 2018, 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 <string.h>
#include "testutils.h"
#define MAXBITS 100
#define COUNT 1000
void
testmain (int argc, char **argv)
{
unsigned i;
mpz_t m, vr, qr, vm, qm, vt;
int resm, resr;
long Q;
unsigned long b0;
mpz_init (m);
mpz_init (vr);
mpz_init (qr);
mpz_init (vm);
mpz_init (qm);
mpz_init (vt);
for (i = 0; i < COUNT; i++)
{
mini_random_lucm_op (MAXBITS, vr, qr, m, &Q, &b0, &resr);
if (b0 == 0)
{
fprintf (stderr, "lucas_mod: test disabled (%u tests done).\n", i);
break;
}
resm = mpz_lucas_mod (vm, qm, Q, b0, m);
if (resr != resm)
{
if (resm != 0 || mpz_cmp_ui (vm, 0) != 0)
{
fprintf (stderr, "mpz_lucas_mod wrong return value (%d != %d):\n", resr, resm);
fprintf (stderr, "Q = %ld , b0 = %lu\n", Q, b0);
dump ("m", m);
dump ("vm", vm);
dump ("qm", qm);
abort ();
}
}
else if (resm == 0)
{
mpz_abs (vr, vr);
mpz_sub (vt, m, vr);
mpz_abs (vm, vm);
mpz_mod (qm, qm, m);
if (mpz_cmp_ui (qr, 0) < 0)
mpz_add (qr, qr, m);
if (mpz_cmp (qm, qr) != 0 ||
(mpz_cmp (vm, vr) != 0 && mpz_cmp (vm, vt) != 0))
{
fprintf (stderr, "mpz_lucas_mod error:\n");
fprintf (stderr, "Q = %ld , b0 = %lu\n", Q, b0);
dump ("m", m);
dump ("vm", vm);
dump ("vr", vr);
dump ("vt", vt);
dump ("qm", qm);
dump ("qr", qr);
abort ();
}
}
}
mpz_clear (m);
mpz_clear (vr);
mpz_clear (qr);
mpz_clear (vm);
mpz_clear (qm);
mpz_clear (vt);
}
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