mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
73 lines
2.3 KiB
C
73 lines
2.3 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) 2012 Fredrik Johansson
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******************************************************************************/
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#include "arb_poly.h"
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void
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arb_poly_set_fmpq_poly(arb_poly_t poly, const fmpq_poly_t src)
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{
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if (fmpq_poly_is_zero(src))
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{
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arb_poly_zero(poly);
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}
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else
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{
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long prec, len, numbits, denbits, shift;
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len = src->length;
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prec = poly->prec;
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_arb_poly_fit_length(poly, len);
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/* todo: handle power of two denominators exactly */
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numbits = _fmpz_vec_max_bits(fmpq_poly_numref(src), len);
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numbits = FLINT_ABS(numbits);
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denbits = fmpz_bits(fmpq_poly_denref(src));
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shift = prec - numbits + denbits;
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if (shift >= 0)
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{
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_fmpz_vec_scalar_mul_2exp(poly->coeffs,
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fmpq_poly_numref(src), len, shift);
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_fmpz_vec_scalar_tdiv_q_fmpz(poly->coeffs,
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poly->coeffs, len, fmpq_poly_denref(src));
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}
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else
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{
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fmpz_t d;
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fmpz_init(d);
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fmpz_mul_2exp(d, fmpq_poly_denref(src), -shift);
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_fmpz_vec_scalar_tdiv_q_fmpz(poly->coeffs, src->coeffs, len, d);
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fmpz_clear(d);
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}
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fmpz_one(&poly->rad);
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fmpz_set_si(&poly->exp, -shift);
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poly->length = len;
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}
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}
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