51 lines
1.7 KiB
C
51 lines
1.7 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) 2011 Sebastian Pancratz
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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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#include "ulong_extras.h"
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void _nmod_poly_divrem_q0(mp_ptr Q, mp_ptr R,
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mp_srcptr A, mp_srcptr B, slong lenA, nmod_t mod)
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{
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const mp_limb_t invL = (B[lenA-1] == 1) ? 1 : n_invmod(B[lenA-1], mod.n);
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if (lenA == 1)
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{
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_nmod_vec_scalar_mul_nmod(Q, A, lenA, invL, mod);
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}
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else
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{
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Q[0] = n_mulmod2_preinv(A[lenA-1], invL, mod.n, mod.ninv);
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_nmod_vec_scalar_mul_nmod(R, B, lenA - 1, Q[0], mod);
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_nmod_vec_sub(R, A, R, lenA - 1, mod);
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}
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}
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