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/*
Copyright (C) 2009 William Hart
This file is part of FLINT.
FLINT 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 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "test_helpers.h"
#include "fmpz.h"
#include "fmpz_poly.h"
#include "ulong_extras.h"
TEST_FUNCTION_START(fmpz_poly_mulhigh_n, state)
{
int i, result;
/* Compare with left truncated product of a and b */
for (i = 0; i < 200 * flint_test_multiplier(); i++)
{
fmpz_poly_t a, b, c;
slong j, n;
fmpz_poly_init(a);
fmpz_poly_init(b);
fmpz_poly_init(c);
n = n_randint(state, 50);
fmpz_poly_randtest(b, state, n, 200);
fmpz_poly_randtest(c, state, n, 200);
fmpz_poly_mulhigh_n(a, b, c, n);
fmpz_poly_mul(b, b, c);
for (j = 0; j + 1 < n; j++)
{
if (j < a->length)
fmpz_zero(a->coeffs + j);
if (j < b->length)
fmpz_zero(b->coeffs + j);
}
_fmpz_poly_normalise(a);
_fmpz_poly_normalise(b);
result = (fmpz_poly_equal(a, b));
if (!result)
{
flint_printf("FAIL:\n");
fmpz_poly_print(a), flint_printf("\n\n");
fmpz_poly_print(b), flint_printf("\n\n");
fflush(stdout);
flint_abort();
}
fmpz_poly_clear(a);
fmpz_poly_clear(b);
fmpz_poly_clear(c);
}
TEST_FUNCTION_END(state);
}