pqc/external/flint-2.4.3/fmpq_poly/test/t-rescale.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpq_poly.h"
#include "ulong_extras.h"
int
main(void)
{
int i, result;
ulong cflags = UWORD(0);
FLINT_TEST_INIT(state);
flint_printf("rescale....");
fflush(stdout);
/* Check aliasing */
for (i = 0; i < 100 * flint_test_multiplier(); i++)
{
fmpq_poly_t f, g;
fmpq_t a;
fmpq_poly_init(f);
fmpq_poly_init(g);
fmpq_poly_randtest(f, state, n_randint(state, 100), 100);
fmpq_init(a);
fmpq_randtest(a, state, 100);
fmpq_poly_rescale(g, f, a);
fmpq_poly_rescale(f, f, a);
cflags |= fmpq_poly_is_canonical(f) ? 0 : 1;
cflags |= fmpq_poly_is_canonical(g) ? 0 : 2;
result = (fmpq_poly_equal(f, g) && !cflags);
if (!result)
{
flint_printf("FAIL (aliasing):\n");
fmpq_poly_debug(f), flint_printf("\n\n");
fmpq_poly_debug(g), flint_printf("\n\n");
flint_printf("cflags = %wu\n\n", cflags);
abort();
}
fmpq_poly_clear(f);
fmpq_poly_clear(g);
fmpq_clear(a);
}
/* Check that rescaling by a and then by 1/a is the identity */
for (i = 0; i < 100 * flint_test_multiplier(); i++)
{
fmpq_poly_t f, g;
fmpq_t a;
fmpq_poly_init(f);
fmpq_poly_init(g);
fmpq_poly_randtest(f, state, n_randint(state, 100), 100);
fmpq_init(a);
fmpq_randtest_not_zero(a, state, 100);
fmpq_poly_rescale(g, f, a);
fmpq_inv(a, a);
fmpq_poly_rescale(g, g, a);
cflags |= fmpq_poly_is_canonical(f) ? 0 : 1;
cflags |= fmpq_poly_is_canonical(g) ? 0 : 2;
result = (fmpq_poly_equal(f, g) && !cflags);
if (!result)
{
flint_printf("FAIL (composition of a and 1/a):\n");
fmpq_poly_debug(f), flint_printf("\n\n");
fmpq_poly_debug(g), flint_printf("\n\n");
flint_printf("cflags = %wu\n\n", cflags);
abort();
}
fmpq_poly_clear(f);
fmpq_poly_clear(g);
fmpq_clear(a);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}