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/*=============================================================================
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 Fredrik Johansson
******************************************************************************/
#include "fmpq.h"
void fmpq_mul_2exp(fmpq_t res, const fmpq_t x, mp_bitcnt_t exp)
{
if (fmpq_is_zero(x) || exp == 0)
{
fmpq_set(res, x);
}
else
{
mp_bitcnt_t v = fmpz_val2(fmpq_denref(x));
if (exp <= v)
{
fmpz_set(fmpq_numref(res), fmpq_numref(x));
fmpz_fdiv_q_2exp(fmpq_denref(res), fmpq_denref(x), exp);
}
else
{
fmpz_mul_2exp(fmpq_numref(res), fmpq_numref(x), exp - v);
fmpz_fdiv_q_2exp(fmpq_denref(res), fmpq_denref(x), v);
}
}
}
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