pqc/external/flint-2.4.3/fq_mat_templates/solve_triu_classical.c
2014-05-24 23:16:06 +02:00

84 lines
2.6 KiB
C

/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2010,2011 Fredrik Johansson
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#ifdef T
#include "templates.h"
void
TEMPLATE(T, mat_solve_triu_classical) (TEMPLATE(T, mat_t) X,
const TEMPLATE(T, mat_t) U,
const TEMPLATE(T, mat_t) B,
int unit, const TEMPLATE(T, ctx_t) ctx)
{
slong i, j, n, m;
TEMPLATE(T, struct) * inv, *tmp;
n = U->r;
m = B->c;
if (!unit)
{
inv = _TEMPLATE(T, vec_init) (n, ctx);
for (i = 0; i < n; i++)
TEMPLATE(T, inv) (inv + i, TEMPLATE(T, mat_entry) (U, i, i), ctx);
}
else
inv = NULL;
tmp = _TEMPLATE(T, vec_init) (n, ctx);
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
TEMPLATE(T, set) (tmp + j, TEMPLATE(T, mat_entry) (X, j, i), ctx);
for (j = n - 1; j >= 0; j--)
{
TEMPLATE(T, t) s;
TEMPLATE(T, init) (s, ctx);
_TEMPLATE(T, vec_dot) (s, U->rows[j] + j + 1, tmp + j + 1,
n - j - 1, ctx);
TEMPLATE(T, sub) (s, TEMPLATE(T, mat_entry) (B, j, i), s, ctx);
if (!unit)
TEMPLATE(T, mul) (s, s, inv + j, ctx);
TEMPLATE(T, set) (tmp + j, s, ctx);
TEMPLATE(T, clear) (s, ctx);
}
for (j = 0; j < n; j++)
TEMPLATE(T, mat_entry_set) (X, j, i, tmp + j, ctx);
}
_TEMPLATE(T, vec_clear) (tmp, n, ctx);
if (!unit)
_TEMPLATE(T, vec_clear) (inv, n, ctx);
}
#endif