mirror of
https://github.com/vale981/arb
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32 lines
992 B
C
32 lines
992 B
C
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/*
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Copyright (C) 2016 Pascal Molin
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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_dft.h"
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#include "acb_poly.h"
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void
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acb_dft_convol_mullow(acb_ptr w, acb_srcptr f, acb_srcptr g, slong len, slong prec)
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{
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/* TODO: should probably use (acb_struct *) arrays */
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acb_ptr gg, ww;
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if (len == 0)
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return;
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gg = _acb_vec_init(2 * len - 1);
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ww = _acb_vec_init(2 * len - 1);
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_acb_vec_set(gg, g, len);
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_acb_vec_set(gg + len, g, len - 1);
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_acb_poly_mullow(ww, f, len, gg, 2 * len - 1, 2 * len - 1, prec);
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_acb_vec_set(w, ww + len, len - 1);
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acb_set(w + len - 1, ww + len - 1);
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_acb_vec_clear(gg, 2 * len - 1);
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_acb_vec_clear(ww, 2 * len - 1);
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}
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