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https://github.com/vale981/arb
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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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Copyright (C) 2012 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 _acb_poly_mul(acb_ptr C,
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acb_srcptr A, slong lenA,
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acb_srcptr B, slong lenB, slong prec)
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{
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_acb_poly_mullow(C, A, lenA, B, lenB, lenA + lenB - 1, prec);
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}
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void
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acb_poly_mul(acb_poly_t res, const acb_poly_t poly1,
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const acb_poly_t poly2, slong prec)
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{
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slong len_out;
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if ((poly1->length == 0) || (poly2->length == 0))
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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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len_out = poly1->length + poly2->length - 1;
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if (res == poly1 || res == poly2)
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{
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acb_poly_t temp;
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acb_poly_init2(temp, len_out);
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_acb_poly_mul(temp->coeffs, poly1->coeffs, poly1->length,
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poly2->coeffs, poly2->length, prec);
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acb_poly_swap(res, temp);
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acb_poly_clear(temp);
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}
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else
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{
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acb_poly_fit_length(res, len_out);
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_acb_poly_mul(res->coeffs, poly1->coeffs, poly1->length,
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poly2->coeffs, poly2->length, prec);
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}
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_acb_poly_set_length(res, len_out);
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_acb_poly_normalise(res);
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}
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