pqc/external/flint-2.4.3/fmpz_poly/test/t-pseudo_div.c
2014-05-24 23:16:06 +02:00

148 lines
4.2 KiB
C

/*=============================================================================
This file is part of FLINT.
FLINT 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 2 of the License, or
(at your option) any later version.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2009 William Hart
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"
#include "ulong_extras.h"
int
main(void)
{
int i, result;
FLINT_TEST_INIT(state);
flint_printf("pseudo_div....");
fflush(stdout);
/* Check r = a - q * b has small degree, no aliasing */
for (i = 0; i < 200 * flint_test_multiplier(); i++)
{
fmpz_poly_t a, b, q, r, prod;
fmpz_t p;
ulong d;
fmpz_init(p);
fmpz_poly_init(a);
fmpz_poly_init(b);
fmpz_poly_init(q);
fmpz_poly_init(r);
fmpz_poly_init(prod);
fmpz_poly_randtest(a, state, n_randint(state, 100), 50);
fmpz_poly_randtest_not_zero(b, state, n_randint(state, 100) + 1, 50);
fmpz_poly_pseudo_div(q, &d, a, b);
fmpz_poly_mul(prod, q, b);
fmpz_pow_ui(p, b->coeffs + b->length - 1, d);
fmpz_poly_scalar_mul_fmpz(a, a, p);
fmpz_poly_sub(r, a, prod);
result = (fmpz_poly_length(r) < fmpz_poly_length(b));
if (!result)
{
flint_printf("FAIL:\n");
fmpz_poly_print(a), flint_printf("\n\n");
fmpz_poly_print(prod), flint_printf("\n\n");
fmpz_poly_print(q), flint_printf("\n\n");
fmpz_poly_print(r), flint_printf("\n\n");
abort();
}
fmpz_clear(p);
fmpz_poly_clear(a);
fmpz_poly_clear(b);
fmpz_poly_clear(q);
fmpz_poly_clear(r);
fmpz_poly_clear(prod);
}
/* Check q and a alias */
for (i = 0; i < 50 * flint_test_multiplier(); i++)
{
fmpz_poly_t a, b, q;
ulong d;
fmpz_poly_init(a);
fmpz_poly_init(b);
fmpz_poly_init(q);
fmpz_poly_randtest(a, state, n_randint(state, 100), 50);
fmpz_poly_randtest_not_zero(b, state, n_randint(state, 100) + 1, 50);
fmpz_poly_pseudo_div(q, &d, a, b);
fmpz_poly_pseudo_div(a, &d, a, b);
result = (fmpz_poly_equal(a, q));
if (!result)
{
flint_printf("FAIL:\n");
fmpz_poly_print(a), flint_printf("\n\n");
fmpz_poly_print(q), flint_printf("\n\n");
abort();
}
fmpz_poly_clear(a);
fmpz_poly_clear(b);
fmpz_poly_clear(q);
}
/* Check q and b alias */
for (i = 0; i < 50 * flint_test_multiplier(); i++)
{
fmpz_poly_t a, b, q;
ulong d;
fmpz_poly_init(a);
fmpz_poly_init(b);
fmpz_poly_init(q);
fmpz_poly_randtest(a, state, n_randint(state, 100), 50);
fmpz_poly_randtest_not_zero(b, state, n_randint(state, 100) + 1, 50);
fmpz_poly_pseudo_div(q, &d, a, b);
fmpz_poly_pseudo_div(b, &d, a, b);
result = (fmpz_poly_equal(b, q));
if (!result)
{
flint_printf("FAIL:\n");
fmpz_poly_print(a), flint_printf("\n\n");
fmpz_poly_print(q), flint_printf("\n\n");
abort();
}
fmpz_poly_clear(a);
fmpz_poly_clear(b);
fmpz_poly_clear(q);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}