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/*
Copyright (C) 2012 Sebastian Pancratz
Copyright (C) 2013 Mike Hansen
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/>.
*/
#ifdef T
#include "templates.h"
void
_TEMPLATE(T, poly_mul_classical) (TEMPLATE(T, struct) * rop,
const TEMPLATE(T, struct) * op1, slong len1,
const TEMPLATE(T, struct) * op2, slong len2,
const TEMPLATE(T, ctx_t) ctx)
{
if (len1 == 1 && len2 == 1)
{
TEMPLATE(T, mul) (rop, op1, op2, ctx);
}
else
{
slong i;
/* Set res[i] = poly1[i]*poly2[0] */
_TEMPLATE(T, TEMPLATE(poly_scalar_mul, T)) (rop, op1, len1, op2, ctx);
/* Set res[i+len1-1] = in1[len1-1]*in2[i] */
_TEMPLATE(T, TEMPLATE(poly_scalar_mul, T)) (rop + len1, op2 + 1,
len2 - 1, op1 + len1 - 1,
ctx);
/* out[i+j] += in1[i]*in2[j] */
for (i = 0; i < len1 - 1; i++)
_TEMPLATE(T, TEMPLATE(poly_scalar_addmul, T)) (rop + i + 1,
op2 + 1, len2 - 1,
op1 + i, ctx);
}
}
void
TEMPLATE(T, poly_mul_classical) (TEMPLATE(T, poly_t) rop,
const TEMPLATE(T, poly_t) op1,
const TEMPLATE(T, poly_t) op2,
const TEMPLATE(T, ctx_t) ctx)
{
const slong len = op1->length + op2->length - 1;
if (op1->length == 0 || op2->length == 0)
{
TEMPLATE(T, poly_zero) (rop, ctx);
return;
}
if (rop == op1 || rop == op2)
{
TEMPLATE(T, poly_t) t;
TEMPLATE(T, poly_init2) (t, len, ctx);
_TEMPLATE(T, poly_mul_classical) (t->coeffs, op1->coeffs, op1->length,
op2->coeffs, op2->length, ctx);
TEMPLATE(T, poly_swap) (rop, t, ctx);
TEMPLATE(T, poly_clear) (t, ctx);
}
else
{
TEMPLATE(T, poly_fit_length) (rop, len, ctx);
_TEMPLATE(T, poly_mul_classical) (rop->coeffs, op1->coeffs,
op1->length, op2->coeffs,
op2->length, ctx);
}
_TEMPLATE(T, poly_set_length) (rop, len, ctx);
}
#endif