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

74 lines
2.1 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) 2011 Sebastian Pancratz
******************************************************************************/
#include "fmpz_mat.h"
#include "padic_mat.h"
void padic_mat_scalar_div_fmpz(padic_mat_t B,
const padic_mat_t A, const fmpz_t c,
const padic_ctx_t ctx)
{
if (padic_mat_is_empty(B))
{
return;
}
if (fmpz_is_zero(c))
{
flint_printf("ERROR (padic_mat_scalar_div_fmpz). c is zero.\n");
abort();
}
if (padic_mat_is_zero(A))
{
padic_mat_zero(B);
}
else
{
fmpz_t d;
slong v;
fmpz_init(d);
v = fmpz_remove(d, c, ctx->p);
if (padic_mat_val(A) - v >= padic_mat_prec(B))
{
padic_mat_zero(B);
}
else
{
_padic_inv(d, d, ctx->p, padic_mat_prec(B) - padic_mat_val(A) + v);
fmpz_mat_scalar_mul_fmpz(padic_mat(B), padic_mat(A), d);
padic_mat_val(B) = padic_mat_val(A) - v;
_padic_mat_reduce(B, ctx);
}
fmpz_clear(d);
}
}