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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_poly.h"
void
_ca_poly_reverse(ca_ptr res, ca_srcptr poly, slong len, slong n, ca_ctx_t ctx)
{
if (res == poly)
{
slong i;
for (i = 0; i < n / 2; i++)
{
ca_struct t = res[i];
res[i] = res[n - 1 - i];
res[n - 1 - i] = t;
}
for (i = 0; i < n - len; i++)
ca_zero(res + i, ctx);
}
else
{
slong i;
for (i = 0; i < n - len; i++)
ca_zero(res + i, ctx);
for (i = 0; i < len; i++)
ca_set(res + (n - len) + i, poly + (len - 1) - i, ctx);
}
}
void
ca_poly_reverse(ca_poly_t res, const ca_poly_t poly, slong n, ca_ctx_t ctx)
{
slong len = FLINT_MIN(n, poly->length);
if (len == 0)
{
ca_poly_zero(res, ctx);
return;
}
ca_poly_fit_length(res, n, ctx);
_ca_poly_reverse(res->coeffs, poly->coeffs, len, n, ctx);
_ca_poly_set_length(res, n, ctx);
_ca_poly_normalise(res, ctx);
}
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