pqc/external/flint-2.4.3/padic/div.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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, 2012 Sebastian Pancratz
******************************************************************************/
#include "padic.h"
void padic_div(padic_t rop, const padic_t op1, const padic_t op2,
const padic_ctx_t ctx)
{
if (padic_is_zero(op2))
{
flint_printf("Exception (padic_div). op2 is zero.\n");
abort();
}
if (padic_is_zero(op1) || padic_val(op1) - padic_val(op2) >= padic_prec(rop))
{
padic_zero(rop);
}
else
{
padic_t inv;
padic_init(inv);
_padic_inv(padic_unit(inv), padic_unit(op2), ctx->p,
padic_prec(rop) - padic_val(op1) + padic_val(op2));
padic_val(inv) = - padic_val(op2);
padic_mul(rop, op1, inv, ctx);
padic_clear(inv);
}
}