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https://github.com/vale981/arb
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60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB 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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ARB 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 ARB; 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 William Hart
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Copyright (C) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmprb_poly.h"
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void
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_fmprb_poly_div_root(fmprb_struct * Q, fmprb_t R, const fmprb_struct * A,
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long len, const fmprb_t c, long prec)
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{
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fmprb_t r, t;
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long i;
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if (len < 2)
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{
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fmprb_zero(R);
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return;
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}
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fmprb_init(r);
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fmprb_init(t);
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fmprb_set(t, A + len - 2);
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fmprb_set(Q + len - 2, A + len - 1);
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fmprb_set(r, Q + len - 2);
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/* TODO: avoid the extra assignments (but still support aliasing) */
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for (i = len - 2; i > 0; i--)
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{
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fmprb_mul(r, r, c, prec);
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fmprb_add(r, r, t, prec);
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fmprb_set(t, A + i - 1);
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fmprb_set(Q + i - 1, r);
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}
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fmprb_mul(r, r, c, prec);
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fmprb_add(R, r, t, prec);
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}
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