79 lines
2.1 KiB
C
79 lines
2.1 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) 2010,2011 Fredrik Johansson
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******************************************************************************/
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#include "fmpz_mat.h"
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void
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fmpz_mat_mul(fmpz_mat_t C, const fmpz_mat_t A, const fmpz_mat_t B)
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{
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slong dim, m, n, k;
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m = A->r;
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n = A->c;
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k = B->c;
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if (C == A || C == B)
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{
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fmpz_mat_t t;
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fmpz_mat_init(t, m, k);
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fmpz_mat_mul(t, A, B);
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fmpz_mat_swap(C, t);
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fmpz_mat_clear(t);
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return;
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}
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dim = FLINT_MIN(FLINT_MIN(m, n), k);
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if (dim < 12)
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{
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/* The inline version only benefits from large n */
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if (n <= 2)
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fmpz_mat_mul_classical(C, A, B);
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else
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fmpz_mat_mul_classical_inline(C, A, B);
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}
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else
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{
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slong ab, bb, bits;
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ab = fmpz_mat_max_bits(A);
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bb = fmpz_mat_max_bits(B);
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ab = FLINT_ABS(ab);
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bb = FLINT_ABS(bb);
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bits = ab + bb + FLINT_BIT_COUNT(n) + 1;
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if (5*(ab + bb) > dim * dim || (bits > FLINT_BITS - 3 && dim < 60))
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{
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fmpz_mat_mul_classical_inline(C, A, B);
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}
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else
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{
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_fmpz_mat_mul_multi_mod(C, A, B, bits);
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}
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}
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}
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