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/*
Copyright (C) 2011 Fredrik Johansson
Copyright (C) 2013 Mike Hansen
This file is part of FLINT.
FLINT 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 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#ifdef T
#include "templates.h"
void
TEMPLATE(T, mat_mul_classical) (TEMPLATE(T, mat_t) C,
const TEMPLATE(T, mat_t) A,
const TEMPLATE(T, mat_t) B,
const TEMPLATE(T, ctx_t) ctx)
{
slong ar, bc, br;
slong i, j;
TEMPLATE(T, struct) * trB;
TMP_INIT;
ar = A->r;
br = B->r;
bc = B->c;
if (br == 0)
{
TEMPLATE(T, mat_zero) (C, ctx);
return;
}
if (C == A || C == B)
{
TEMPLATE(T, mat_t) T;
TEMPLATE(T, mat_init) (T, ar, bc, ctx);
TEMPLATE(T, mat_mul_classical) (T, A, B, ctx);
TEMPLATE(T, mat_swap_entrywise) (C, T, ctx);
TEMPLATE(T, mat_clear) (T, ctx);
return;
}
TMP_START;
trB = (TEMPLATE(T, struct) *) TMP_ALLOC(br*bc*sizeof(TEMPLATE(T, struct)));
/* shallow transpose so columns of B are vectors */
for (i = 0; i < br; i++)
{
for (j = 0; j < bc; j++)
trB[j*br + i] = *TEMPLATE(T, mat_entry) (B, i, j);
}
for (i = 0; i < ar; i++)
{
for (j = 0; j < bc; j++)
{
_TEMPLATE(T, vec_dot) (TEMPLATE(T, mat_entry) (C, i, j),
TEMPLATE(T, mat_entry) (A, i, 0), trB + j * br, br, ctx);
}
}
TMP_END;
}
#endif