106 lines
3.1 KiB
C
106 lines
3.1 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) 2011 William Hart
|
||
|
|
Copyright (C) 2011 Sebastian Pancratz
|
||
|
|
Copyright (C) 2013 Martin Lee
|
||
|
|
Copyright (C) 2013 Mike Hansen
|
||
|
|
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef T
|
||
|
|
|
||
|
|
#include "templates.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
_TEMPLATE(T, poly_div_newton_n_preinv) (
|
||
|
|
TEMPLATE(T, struct) *Q,
|
||
|
|
const TEMPLATE(T, struct) *A, slong lenA,
|
||
|
|
const TEMPLATE(T, struct) *B, slong lenB,
|
||
|
|
const TEMPLATE(T, struct) * Binv, slong lenBinv,
|
||
|
|
const TEMPLATE(T, ctx_t) ctx)
|
||
|
|
{
|
||
|
|
const slong lenQ = lenA - lenB + 1;
|
||
|
|
TEMPLATE(T, struct) * Arev;
|
||
|
|
|
||
|
|
Arev = _TEMPLATE(T, vec_init) (lenQ, ctx);
|
||
|
|
|
||
|
|
_TEMPLATE(T, poly_reverse) (Arev, A + (lenA - lenQ), lenQ, lenQ, ctx);
|
||
|
|
|
||
|
|
_TEMPLATE(T, poly_mullow) (Q, Arev, lenQ, Binv, FLINT_MIN(lenQ, lenBinv),
|
||
|
|
lenQ, ctx);
|
||
|
|
|
||
|
|
_TEMPLATE(T, poly_reverse) (Q, Q, lenQ, lenQ, ctx);
|
||
|
|
|
||
|
|
_TEMPLATE(T, vec_clear) (Arev, lenQ, ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
TEMPLATE(T, poly_div_newton_n_preinv) (TEMPLATE(T, poly_t) Q,
|
||
|
|
const TEMPLATE(T, poly_t) A,
|
||
|
|
const TEMPLATE(T, poly_t) B,
|
||
|
|
const TEMPLATE(T, poly_t) Binv,
|
||
|
|
const TEMPLATE(T, ctx_t) ctx)
|
||
|
|
{
|
||
|
|
const slong lenA = A->length,
|
||
|
|
lenB = B->length, lenQ = lenA - lenB + 1, lenBinv = Binv->length;
|
||
|
|
|
||
|
|
TEMPLATE(T, struct) * q;
|
||
|
|
|
||
|
|
if (lenB == 0)
|
||
|
|
{
|
||
|
|
TEMPLATE_PRINTF("Exception (%s_poly_div_newton). Division by zero.\n",
|
||
|
|
T);
|
||
|
|
abort();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (lenA < lenB)
|
||
|
|
{
|
||
|
|
TEMPLATE(T, poly_zero) (Q, ctx);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Q == A || Q == B || Q == Binv)
|
||
|
|
{
|
||
|
|
q = _TEMPLATE(T, vec_init) (lenQ, ctx);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
TEMPLATE(T, poly_fit_length) (Q, lenQ, ctx);
|
||
|
|
q = Q->coeffs;
|
||
|
|
}
|
||
|
|
|
||
|
|
_TEMPLATE(T, poly_div_newton_n_preinv) (q, A->coeffs, lenA, B->coeffs,
|
||
|
|
lenB, Binv->coeffs, lenBinv, ctx);
|
||
|
|
|
||
|
|
if (Q == A || Q == B || Q == Binv)
|
||
|
|
{
|
||
|
|
flint_free(Q->coeffs);
|
||
|
|
Q->coeffs = q;
|
||
|
|
Q->alloc = lenQ;
|
||
|
|
}
|
||
|
|
Q->length = lenQ;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|