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/*=============================================================================
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) 2008, 2009 William Hart
Copyright (C) 2011 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpz_poly.h"
/* Assumes len > 0. */
void _fmpz_poly_sqr_classical(fmpz *rop, const fmpz *op, slong len)
{
if (len == 1) /* Special case */
{
fmpz_mul(rop, op, op);
}
else /* Ordinary case */
{
slong i;
_fmpz_vec_scalar_mul_fmpz(rop, op, len, op);
_fmpz_vec_scalar_mul_fmpz(rop + len, op + 1, len - 1, op + len - 1);
for (i = 1; i < len - 1; i++)
_fmpz_vec_scalar_addmul_fmpz(rop + i + 1, op + 1, i - 1, op + i);
for (i = 1; i < 2 * len - 2; i++)
fmpz_mul_ui(rop + i, rop + i, 2);
for (i = 1; i < len - 1; i++)
fmpz_addmul(rop + 2 * i, op + i, op + i);
}
}
void fmpz_poly_sqr_classical(fmpz_poly_t rop, const fmpz_poly_t op)
{
slong len;
if (op->length == 0)
{
fmpz_poly_zero(rop);
return;
}
len = 2 * op->length - 1;
if (rop == op)
{
fmpz_poly_t t;
fmpz_poly_init2(t, len);
_fmpz_poly_sqr_classical(t->coeffs, op->coeffs, op->length);
fmpz_poly_swap(rop, t);
fmpz_poly_clear(t);
}
else
{
fmpz_poly_fit_length(rop, len);
_fmpz_poly_sqr_classical(rop->coeffs, op->coeffs, op->length);
}
_fmpz_poly_set_length(rop, len);
}
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