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/*
Copyright (C) 2011 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "test_helpers.h"
#include "fmpq.h"
TEST_FUNCTION_START(fmpq_div_2exp, state)
{
int i, result;
for (i = 0; i < 10000 * flint_test_multiplier(); i++)
{
fmpq_t a, b;
mpq_t c, d, e;
flint_bitcnt_t exp;
int aliasing;
fmpq_init(a);
fmpq_init(b);
mpq_init(c);
mpq_init(d);
mpq_init(e);
fmpq_randtest(a, state, 200);
switch (n_randint(state, 5))
{
case 0:
fmpz_mul_2exp(fmpq_numref(a), fmpq_numref(a), n_randint(state, 200));
fmpq_canonicalise(a);
break;
case 1:
fmpz_mul_2exp(fmpq_denref(a), fmpq_denref(a), n_randint(state, 200));
fmpq_canonicalise(a);
break;
}
fmpq_get_mpq(c, a);
exp = n_randint(state, 200);
aliasing = n_randint(state, 2);
if (aliasing == 0)
{
fmpq_div_2exp(b, a, exp);
}
else
{
fmpq_set(b, a);
fmpq_div_2exp(b, b, exp);
}
mpq_div_2exp(d, c, exp);
fmpq_get_mpq(e, b);
result = (mpq_cmp(d, e) == 0) && fmpq_is_canonical(b);
if (!result)
{
flint_printf("FAIL:\n");
gmp_printf("c = %Qd, d = %Qd, e = %Qd, exp = %Md\n", c, d, e, exp);
fflush(stdout);
flint_abort();
}
fmpq_clear(a);
fmpq_clear(b);
mpq_clear(c);
mpq_clear(d);
mpq_clear(e);
}
TEST_FUNCTION_END(state);
}