90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*============================================================================
|
|
|
|
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) 2012 Sebastian Pancratz
|
|
|
|
******************************************************************************/
|
|
|
|
#include "fmpz_mod_poly.h"
|
|
#include "padic_poly.h"
|
|
|
|
void _padic_poly_pow(fmpz *rop, slong *rval, slong N,
|
|
const fmpz *op, slong val, slong len, ulong e,
|
|
const padic_ctx_t ctx)
|
|
{
|
|
fmpz_t pow;
|
|
int alloc;
|
|
|
|
*rval = (slong) e * val;
|
|
|
|
alloc = _padic_ctx_pow_ui(pow, N - *rval, ctx);
|
|
|
|
_fmpz_mod_poly_pow(rop, op, len, e, pow);
|
|
|
|
if (alloc)
|
|
fmpz_clear(pow);
|
|
}
|
|
|
|
void padic_poly_pow(padic_poly_t rop, const padic_poly_t op, ulong e,
|
|
const padic_ctx_t ctx)
|
|
{
|
|
if (e == 0)
|
|
{
|
|
padic_poly_one(rop);
|
|
}
|
|
else if (op->length == 0 || (slong) e * op->val >= rop->N)
|
|
{
|
|
padic_poly_zero(rop);
|
|
}
|
|
else if (e == 1)
|
|
{
|
|
padic_poly_set(rop, op, ctx);
|
|
}
|
|
else
|
|
{
|
|
const slong rlen = (slong) e * (op->length - 1) + 1;
|
|
fmpz *t;
|
|
|
|
if (rop == op)
|
|
{
|
|
t = _fmpz_vec_init(rlen);
|
|
}
|
|
else
|
|
{
|
|
padic_poly_fit_length(rop, rlen);
|
|
t = rop->coeffs;
|
|
}
|
|
|
|
_padic_poly_pow(t, &(rop->val), rop->N,
|
|
op->coeffs, op->val, op->length, e, ctx);
|
|
|
|
if (rop == op)
|
|
{
|
|
_fmpz_vec_clear(rop->coeffs, rop->alloc);
|
|
rop->coeffs = t;
|
|
rop->alloc = rlen;
|
|
}
|
|
_padic_poly_set_length(rop, rlen);
|
|
_padic_poly_normalise(rop);
|
|
}
|
|
}
|
|
|