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/*
Copyright (C) 2020 Fredrik Johansson
This file is part of Calcium.
Calcium 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 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "ca.h"
void
ca_dot(ca_t res, const ca_t initial, int subtract,
ca_srcptr x, slong xstep, ca_srcptr y, slong ystep, slong len, ca_ctx_t ctx)
{
slong i;
ca_t t;
if (len <= 0)
{
if (initial == NULL)
ca_zero(res, ctx);
else
ca_set(res, initial, ctx);
return;
}
ca_init(t, ctx);
if (initial == NULL)
{
ca_mul(res, x, y, ctx);
}
else
{
if (subtract)
ca_neg(res, initial, ctx);
else
ca_set(res, initial, ctx);
ca_mul(t, x, y, ctx);
ca_add(res, res, t, ctx);
}
for (i = 1; i < len; i++)
{
ca_mul(t, x + i * xstep, y + i * ystep, ctx);
ca_add(res, res, t, ctx);
}
if (subtract)
ca_neg(res, res, ctx);
ca_clear(t, ctx);
}
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