mirror of
https://github.com/vale981/arb
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54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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Copyright (C) 2008, 2009 William Hart
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Copyright (C) 2010 Sebastian Pancratz
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Copyright (C) 2013 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "acb_poly.h"
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void
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_acb_poly_shift_right(acb_ptr res, acb_srcptr poly, slong len, slong n)
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{
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slong i;
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/* Copy in forward order to avoid writing over unshifted coefficients */
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if (res != poly)
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{
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for (i = 0; i < len - n; i++)
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acb_set(res + i, poly + n + i);
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}
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else
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{
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for (i = 0; i < len - n; i++)
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acb_swap(res + i, res + n + i);
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}
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}
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void
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acb_poly_shift_right(acb_poly_t res, const acb_poly_t poly, slong n)
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{
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if (n == 0)
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{
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acb_poly_set(res, poly);
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return;
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}
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if (poly->length <= n)
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{
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acb_poly_zero(res);
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return;
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}
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acb_poly_fit_length(res, poly->length - n);
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_acb_poly_shift_right(res->coeffs, poly->coeffs, poly->length, n);
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_acb_poly_set_length(res, poly->length - n);
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}
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