79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*=============================================================================
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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) 2011 Fredrik Johansson
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******************************************************************************/
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#include <stdlib.h>
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#include "flint.h"
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#include "nmod_poly.h"
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#include "nmod_poly_mat.h"
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static __inline__ void
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nmod_poly_sqr(nmod_poly_t y, const nmod_poly_t x)
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{
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nmod_poly_mul(y, x, x);
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}
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#define E nmod_poly_mat_entry
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void
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nmod_poly_mat_sqr_classical(nmod_poly_mat_t B, const nmod_poly_mat_t A)
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{
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slong n = A->r;
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if (n == 0)
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return;
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if (n == 1)
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{
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nmod_poly_sqr(E(B, 0, 0), E(A, 0, 0));
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return;
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}
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if (n == 2)
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{
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nmod_poly_t t, u;
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nmod_poly_init(t, nmod_poly_mat_modulus(A));
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nmod_poly_init(u, nmod_poly_mat_modulus(A));
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nmod_poly_add(t, E(A, 0, 0), E(A, 1, 1));
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nmod_poly_mul(u, E(A, 0, 1), E(A, 1, 0));
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nmod_poly_sqr(E(B, 0, 0), E(A, 0, 0));
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nmod_poly_add(E(B, 0, 0), E(B, 0, 0), u);
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nmod_poly_sqr(E(B, 1, 1), E(A, 1, 1));
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nmod_poly_add(E(B, 1, 1), E(B, 1, 1), u);
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nmod_poly_mul(E(B, 0, 1), E(A, 0, 1), t);
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nmod_poly_mul(E(B, 1, 0), E(A, 1, 0), t);
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nmod_poly_clear(t);
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nmod_poly_clear(u);
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return;
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}
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nmod_poly_mat_mul_classical(B, A, A);
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}
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