128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
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/*=============================================================================
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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) 2012 Sebastian Pancratz
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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_divrem_basecase) (TEMPLATE(T, struct) * Q,
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TEMPLATE(T, struct) * R,
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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, t) invB,
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const TEMPLATE(T, ctx_t) ctx)
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{
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slong iQ, iR;
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if (R != A)
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_TEMPLATE(T, poly_set) (R, A, lenA, ctx);
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for (iQ = lenA - lenB, iR = lenA - 1; iQ >= 0; iQ--, iR--)
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{
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if (TEMPLATE(T, is_zero) (R + iR, ctx))
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TEMPLATE(T, zero) (Q + iQ, ctx);
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else
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{
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TEMPLATE(T, mul) (Q + iQ, R + iR, invB, ctx);
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_TEMPLATE(T, TEMPLATE(poly_scalar_submul, T)) (R + iQ, B, lenB,
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Q + iQ, ctx);
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}
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}
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}
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void
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TEMPLATE(T, poly_divrem_basecase) (TEMPLATE(T, poly_t) Q,
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TEMPLATE(T, poly_t) R,
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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, ctx_t) ctx)
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{
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const slong lenA = A->length, lenB = B->length, lenQ = lenA - lenB + 1;
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TEMPLATE(T, struct) * q, *r;
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TEMPLATE(T, t) invB;
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if (lenA < lenB)
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{
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TEMPLATE(T, poly_set) (R, A, ctx);
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TEMPLATE(T, poly_zero) (Q, ctx);
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return;
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}
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TEMPLATE(T, init) (invB, ctx);
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TEMPLATE(T, inv) (invB, TEMPLATE(T, poly_lead) (B, ctx), ctx);
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if (Q == A || Q == B)
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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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if (R == B)
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{
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r = _TEMPLATE(T, vec_init) (lenA, ctx);
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}
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else
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{
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TEMPLATE(T, poly_fit_length) (R, lenA, ctx);
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r = R->coeffs;
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}
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_TEMPLATE(T, poly_divrem_basecase) (q, r, A->coeffs, lenA,
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B->coeffs, lenB, invB, ctx);
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if (Q == A || Q == B)
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{
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_TEMPLATE(T, vec_clear) (Q->coeffs, Q->alloc, ctx);
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Q->coeffs = q;
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Q->alloc = lenQ;
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Q->length = lenQ;
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}
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else
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{
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_TEMPLATE(T, poly_set_length) (Q, lenQ, ctx);
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}
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if (R == B)
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{
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_TEMPLATE(T, vec_clear) (R->coeffs, R->alloc, ctx);
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R->coeffs = r;
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R->alloc = lenA;
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R->length = lenA;
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}
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_TEMPLATE(T, poly_set_length) (R, lenB - 1, ctx);
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_TEMPLATE(T, poly_normalise) (R, ctx);
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TEMPLATE(T, clear) (invB, ctx);
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}
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#endif
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