118 lines
3.4 KiB
C
118 lines
3.4 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, 2009 William Hart
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Copyright (C) 2010, 2012 Sebastian Pancratz
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#ifdef T
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#include "templates.h"
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#include "fmpz_poly.h"
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void
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_TEMPLATE(T, poly_mullow_KS) (TEMPLATE(T, struct) * rop,
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const TEMPLATE(T, struct) * op1, slong len1,
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const TEMPLATE(T, struct) * op2, slong len2,
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slong n, const TEMPLATE(T, ctx_t) ctx)
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{
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const slong d = TEMPLATE(T, ctx_degree) (ctx);
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slong bits, i, m;
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fmpz *f, *g, *h;
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TEMPLATE(CAP_T, VEC_NORM) (op1, len1, ctx);
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TEMPLATE(CAP_T, VEC_NORM) (op2, len2, ctx);
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if (!len1 | !len2)
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{
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_TEMPLATE(T, poly_zero) (rop, n, ctx);
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return;
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}
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bits = 2 * fmpz_bits(TEMPLATE(T, ctx_prime) (ctx))
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+ FLINT_BIT_COUNT(d) + FLINT_BIT_COUNT(FLINT_MIN(len1, len2));
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f = _fmpz_vec_init(n + len1 + len2);
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g = f + n;
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h = g + len1;
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for (i = 0; i < len1; i++)
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{
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TEMPLATE(T, bit_pack) (g + i, op1 + i, bits, ctx);
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}
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for (i = 0; i < len2; i++)
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{
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TEMPLATE(T, bit_pack) (h + i, op2 + i, bits, ctx);
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}
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m = FLINT_MIN(n, len1 + len2 - 1);
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if (len1 >= len2)
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_fmpz_poly_mullow(f, g, len1, h, len2, m);
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else
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_fmpz_poly_mullow(f, h, len2, g, len1, m);
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for (i = 0; i < m; i++)
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{
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TEMPLATE(T, bit_unpack) (rop + i, f + i, bits, ctx);
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}
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for (; i < n; i++)
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{
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TEMPLATE(T, zero) (rop + i, ctx);
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}
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_fmpz_vec_clear(f, n + len1 + len2);
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}
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void
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TEMPLATE(T, poly_mullow_KS) (TEMPLATE(T, poly_t) rop,
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const TEMPLATE(T, poly_t) op1,
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const TEMPLATE(T, poly_t) op2,
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slong n, const TEMPLATE(T, ctx_t) ctx)
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{
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const slong len1 = op1->length;
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const slong len2 = op2->length;
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if (len1 == 0 || len2 == 0 || n == 0)
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{
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TEMPLATE(T, poly_zero) (rop, ctx);
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}
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else
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{
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const slong lenr = op1->length + op2->length - 1;
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if (n > lenr)
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n = lenr;
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TEMPLATE(T, poly_fit_length) (rop, n, ctx);
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_TEMPLATE(T, poly_mullow_KS) (rop->coeffs, op1->coeffs, len1,
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op2->coeffs, len2, n, ctx);
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_TEMPLATE(T, poly_set_length) (rop, n, ctx);
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_TEMPLATE(T, poly_normalise) (rop, ctx);
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}
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}
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#endif
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