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

78 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_recursive) (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)
{
TEMPLATE(T, mat_t) UA, UB, UD, XX, XY, BX, BY;
slong r, n, m;
n = U->r;
m = B->c;
r = n / 2;
if (n == 0 || m == 0)
return;
/*
Denoting inv(M) by M^, we have:
[A B]^ [X] == [A^ (X - B D^ Y)]
[0 D] [Y] == [ D^ Y ]
*/
TEMPLATE(T, mat_window_init) (UA, U, 0, 0, r, r, ctx);
TEMPLATE(T, mat_window_init) (UB, U, 0, r, r, n, ctx);
TEMPLATE(T, mat_window_init) (UD, U, r, r, n, n, ctx);
TEMPLATE(T, mat_window_init) (BX, B, 0, 0, r, m, ctx);
TEMPLATE(T, mat_window_init) (BY, B, r, 0, n, m, ctx);
TEMPLATE(T, mat_window_init) (XX, X, 0, 0, r, m, ctx);
TEMPLATE(T, mat_window_init) (XY, X, r, 0, n, m, ctx);
TEMPLATE(T, mat_solve_triu) (XY, UD, BY, unit, ctx);
TEMPLATE(T, mat_submul) (XX, BX, UB, XY, ctx);
TEMPLATE(T, mat_solve_triu) (XX, UA, XX, unit, ctx);
TEMPLATE(T, mat_window_clear) (UA, ctx);
TEMPLATE(T, mat_window_clear) (UB, ctx);
TEMPLATE(T, mat_window_clear) (UD, ctx);
TEMPLATE(T, mat_window_clear) (BX, ctx);
TEMPLATE(T, mat_window_clear) (BY, ctx);
TEMPLATE(T, mat_window_clear) (XX, ctx);
TEMPLATE(T, mat_window_clear) (XY, ctx);
}
#endif