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/*
Copyright (C) 2016 Arb authors
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "bool_mat.h"
void
bool_mat_mul(bool_mat_t C, const bool_mat_t A, const bool_mat_t B)
{
slong ar, ac, br, bc, i, j, k;
ar = bool_mat_nrows(A);
ac = bool_mat_ncols(A);
br = bool_mat_nrows(B);
bc = bool_mat_ncols(B);
if (ac != br || ar != bool_mat_nrows(C) || bc != bool_mat_ncols(C))
{
flint_printf("bool_mat_mul: incompatible dimensions\n");
flint_abort();
}
if (br == 0)
{
bool_mat_zero(C);
return;
}
if (A == C || B == C)
{
bool_mat_t T;
bool_mat_init(T, ar, bc);
bool_mat_mul(T, A, B);
bool_mat_swap(T, C);
bool_mat_clear(T);
return;
}
for (i = 0; i < ar; i++)
{
for (j = 0; j < bc; j++)
{
int any = 0;
for (k = 0; k < br && !any; k++)
any |= (bool_mat_get_entry(A, i, k) &
bool_mat_get_entry(B, k, j));
bool_mat_set_entry(C, i, j, any);
}
}
}
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