100 lines
2.6 KiB
C
100 lines
2.6 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) 2010 Sebastian Pancratz
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Copyright (C) 2011 William Hart
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******************************************************************************/
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#include <stdlib.h>
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#include <gmp.h>
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#include "flint.h"
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#include "nmod_vec.h"
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#include "nmod_poly.h"
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void _nmod_poly_rem(mp_ptr R, mp_srcptr A, slong lenA,
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mp_srcptr B, slong lenB, nmod_t mod)
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{
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TMP_INIT;
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if (lenA - lenB == 1)
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{
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_nmod_poly_rem_q1(R, A, lenA, B, lenB, mod);
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}
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else if (lenA < NMOD_DIVREM_DIVCONQUER_CUTOFF)
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{
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mp_ptr W;
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TMP_START;
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W = TMP_ALLOC(NMOD_DIVREM_BC_ITCH(lenA, lenB, mod)*sizeof(mp_limb_t));
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_nmod_poly_rem_basecase(R, W, A, lenA, B, lenB, mod);
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TMP_END;
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}
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else
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{
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mp_ptr Q = _nmod_vec_init(lenA - lenB + 1);
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_nmod_poly_divrem(Q, R, A, lenA, B, lenB, mod);
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_nmod_vec_clear(Q);
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}
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}
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void nmod_poly_rem(nmod_poly_t R, const nmod_poly_t A, const nmod_poly_t B)
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{
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const slong lenA = A->length, lenB = B->length;
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nmod_poly_t tR;
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mp_ptr r;
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if (lenB == 0)
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{
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flint_printf("Exception (nmod_poly_rem). Division by zero.\n");
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abort();
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}
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if (lenA < lenB)
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{
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nmod_poly_set(R, A);
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return;
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}
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if (R == A || R == B)
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{
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nmod_poly_init2_preinv(tR, B->mod.n, B->mod.ninv, lenB - 1);
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r = tR->coeffs;
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}
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else
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{
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nmod_poly_fit_length(R, lenB - 1);
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r = R->coeffs;
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}
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_nmod_poly_rem(r, A->coeffs, lenA, B->coeffs, lenB, A->mod);
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if (R == A || R == B)
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{
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nmod_poly_swap(R, tR);
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nmod_poly_clear(tR);
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}
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R->length = lenB - 1;
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_nmod_poly_normalise(R);
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}
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