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

128 lines
3.7 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, 2012 Sebastian Pancratz
******************************************************************************/
#include "padic.h"
void padic_add(padic_t rop, const padic_t op1, const padic_t op2,
const padic_ctx_t ctx)
{
if (padic_prec(rop) <= FLINT_MIN(padic_val(op1), padic_val(op2)))
{
padic_zero(rop);
return;
}
if (padic_is_zero(op1))
{
padic_set(rop, op2, ctx);
}
else if (padic_is_zero(op2))
{
padic_set(rop, op1, ctx);
}
else
{
if (padic_val(op1) == padic_val(op2))
{
fmpz_add(padic_unit(rop), padic_unit(op1), padic_unit(op2));
padic_val(rop) = padic_val(op1);
_padic_canonicalise(rop, ctx);
if (padic_prec(rop) <= padic_val(rop))
{
padic_zero(rop);
return;
}
}
else if (padic_val(op1) < padic_val(op2))
{
fmpz_t f;
fmpz_init(f);
fmpz_pow_ui(f, ctx->p, padic_val(op2) - padic_val(op1));
if (rop != op2)
{
fmpz_set(padic_unit(rop), padic_unit(op1));
fmpz_addmul(padic_unit(rop), f, padic_unit(op2));
}
else
{
fmpz_mul(padic_unit(rop), f, padic_unit(op2));
fmpz_add(padic_unit(rop), padic_unit(rop), padic_unit(op1));
}
fmpz_clear(f);
padic_val(rop) = padic_val(op1);
}
else /* padic_val(op1) > padic_val(op2) */
{
fmpz_t f;
fmpz_init(f);
fmpz_pow_ui(f, ctx->p, padic_val(op1) - padic_val(op2));
if (rop != op1)
{
fmpz_set(padic_unit(rop), padic_unit(op2));
fmpz_addmul(padic_unit(rop), f, padic_unit(op1));
}
else
{
fmpz_mul(padic_unit(rop), f, padic_unit(op1));
fmpz_add(padic_unit(rop), padic_unit(rop), padic_unit(op2));
}
fmpz_clear(f);
padic_val(rop) = padic_val(op2);
}
/* Reduce */
{
int alloc;
fmpz_t pow;
alloc = _padic_ctx_pow_ui(pow, padic_prec(rop) - padic_val(rop), ctx);
if (padic_prec(rop) >= FLINT_MAX(padic_prec(op1), padic_prec(op2)))
{
if (fmpz_cmpabs(padic_unit(rop), pow) >= 0)
fmpz_sub(padic_unit(rop), padic_unit(rop), pow);
}
else
{
fmpz_mod(padic_unit(rop), padic_unit(rop), pow);
}
if (fmpz_is_zero(padic_unit(rop)))
padic_val(rop) = 0;
if (alloc)
fmpz_clear(pow);
}
}
}