114 lines
3.2 KiB
C
114 lines
3.2 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 Fredrik Johansson
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_vec.h"
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#include "fmpz_poly.h"
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#include "nmod_poly.h"
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void
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_fmpz_poly_CRT_ui_precomp(fmpz * res, const fmpz * poly1, slong len1,
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const fmpz_t m1, mp_srcptr poly2, slong len2, mp_limb_t m2,
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mp_limb_t m2inv, fmpz_t m1m2, mp_limb_t c, int sign)
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{
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slong i;
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for (i = 0; i < FLINT_MIN(len1, len2); i++)
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{
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_fmpz_CRT_ui_precomp(res + i, poly1 + i, m1,
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poly2[i], m2, m2inv, m1m2, c, sign);
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}
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if (len2 > len1)
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{
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fmpz_t zero;
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fmpz_init(zero);
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for (i = len1; i < len2; i++)
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{
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_fmpz_CRT_ui_precomp(res + i, zero, m1,
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poly2[i], m2, m2inv, m1m2, c, sign);
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}
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fmpz_clear(zero);
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}
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for (i = len2; i < len1; i++)
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{
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_fmpz_CRT_ui_precomp(res + i, res + i, m1,
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0, m2, m2inv, m1m2, c, sign);
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}
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}
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void
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_fmpz_poly_CRT_ui(fmpz * res, const fmpz * poly1, slong len1,
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const fmpz_t m1, mp_srcptr poly2, slong len2, mp_limb_t m2,
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mp_limb_t m2inv, int sign)
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{
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mp_limb_t c;
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fmpz_t m1m2;
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c = fmpz_fdiv_ui(m1, m2);
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c = n_invmod(c, m2);
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if (c == 0)
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{
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flint_printf("Exception (_fmpz_poly_CRT_ui): m1 not invertible modulo m2.\n");
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abort();
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}
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fmpz_init(m1m2);
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fmpz_mul_ui(m1m2, m1, m2);
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_fmpz_poly_CRT_ui_precomp(res, poly1, len1, m1,
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poly2, len2, m2, m2inv, m1m2, c, sign);
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fmpz_clear(m1m2);
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}
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void
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fmpz_poly_CRT_ui(fmpz_poly_t res, const fmpz_poly_t poly1,
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const fmpz_t m1, const nmod_poly_t poly2, int sign)
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{
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slong len1 = poly1->length;
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slong len2 = poly2->length;
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slong len = FLINT_MAX(len1, len2);
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if (len == 0)
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{
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fmpz_poly_zero(res);
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return;
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}
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fmpz_poly_fit_length(res, len);
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_fmpz_poly_CRT_ui(res->coeffs, poly1->coeffs, poly1->length, m1,
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poly2->coeffs, poly2->length, poly2->mod.n, poly2->mod.ninv, sign);
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_fmpz_poly_set_length(res, len);
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_fmpz_poly_normalise(res);
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}
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