106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 William Hart
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Copyright (C) 2011 Sebastian Pancratz
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Copyright (C) 2013 Martin Lee
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#ifdef T
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#include "templates.h"
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void
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_TEMPLATE(T, poly_div_newton_n_preinv) (
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TEMPLATE(T, struct) *Q,
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const TEMPLATE(T, struct) *A, slong lenA,
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const TEMPLATE(T, struct) *B, slong lenB,
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const TEMPLATE(T, struct) * Binv, slong lenBinv,
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const TEMPLATE(T, ctx_t) ctx)
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{
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const slong lenQ = lenA - lenB + 1;
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TEMPLATE(T, struct) * Arev;
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Arev = _TEMPLATE(T, vec_init) (lenQ, ctx);
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_TEMPLATE(T, poly_reverse) (Arev, A + (lenA - lenQ), lenQ, lenQ, ctx);
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_TEMPLATE(T, poly_mullow) (Q, Arev, lenQ, Binv, FLINT_MIN(lenQ, lenBinv),
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lenQ, ctx);
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_TEMPLATE(T, poly_reverse) (Q, Q, lenQ, lenQ, ctx);
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_TEMPLATE(T, vec_clear) (Arev, lenQ, ctx);
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}
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void
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TEMPLATE(T, poly_div_newton_n_preinv) (TEMPLATE(T, poly_t) Q,
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const TEMPLATE(T, poly_t) A,
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const TEMPLATE(T, poly_t) B,
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const TEMPLATE(T, poly_t) Binv,
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const TEMPLATE(T, ctx_t) ctx)
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{
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const slong lenA = A->length,
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lenB = B->length, lenQ = lenA - lenB + 1, lenBinv = Binv->length;
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TEMPLATE(T, struct) * q;
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if (lenB == 0)
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{
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TEMPLATE_PRINTF("Exception (%s_poly_div_newton). Division by zero.\n",
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T);
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abort();
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}
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if (lenA < lenB)
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{
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TEMPLATE(T, poly_zero) (Q, ctx);
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return;
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}
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if (Q == A || Q == B || Q == Binv)
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{
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q = _TEMPLATE(T, vec_init) (lenQ, ctx);
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}
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else
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{
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TEMPLATE(T, poly_fit_length) (Q, lenQ, ctx);
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q = Q->coeffs;
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}
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_TEMPLATE(T, poly_div_newton_n_preinv) (q, A->coeffs, lenA, B->coeffs,
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lenB, Binv->coeffs, lenBinv, ctx);
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if (Q == A || Q == B || Q == Binv)
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{
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flint_free(Q->coeffs);
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Q->coeffs = q;
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Q->alloc = lenQ;
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}
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Q->length = lenQ;
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}
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#endif
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