67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
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/*=============================================================================
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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) 2008-2011 William Hart
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******************************************************************************/
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#include "fmpz_poly.h"
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#include "fft.h"
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#include "fft_tuning.h"
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void _fmpz_poly_mul_SS(fmpz *output, const fmpz *input1, slong len1,
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const fmpz *input2, slong len2)
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{
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const slong rlen = len1 + len2 - 1;
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_fmpz_poly_mullow_SS(output, input1, len1, input2, len2, rlen);
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}
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void
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fmpz_poly_mul_SS(fmpz_poly_t res,
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const fmpz_poly_t poly1, const fmpz_poly_t poly2)
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{
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const slong len1 = poly1->length, len2 = poly2->length;
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slong rlen;
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if (len1 == 0 || len2 == 0)
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{
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fmpz_poly_zero(res);
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return;
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}
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if (len1 == 1 || len2 == 1)
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{
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fmpz_poly_mul_classical(res, poly1, poly2);
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return;
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}
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rlen = len1 + len2 - 1;
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fmpz_poly_fit_length(res, rlen);
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if (len1 >= len2)
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_fmpz_poly_mullow_SS(res->coeffs, poly1->coeffs, len1,
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poly2->coeffs, len2, rlen);
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else
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_fmpz_poly_mullow_SS(res->coeffs, poly2->coeffs, len2,
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poly1->coeffs, len1, rlen);
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_fmpz_poly_set_length(res, rlen);
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}
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