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/*
Copyright (C) 2022 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 <gmp.h>
#include "longlong.h"
#include "fmpzi.h"
slong fmpzi_bits(const fmpzi_t x)
{
ulong v;
fmpz a, b;
a = *fmpzi_realref(x);
b = *fmpzi_imagref(x);
if (!COEFF_IS_MPZ(a))
{
if (!COEFF_IS_MPZ(b))
{
v = FLINT_ABS(a) | FLINT_ABS(b);
return FLINT_BIT_COUNT(v);
}
else
{
return mpz_sizeinbase(COEFF_TO_PTR(b), 2);
}
}
else
{
if (!COEFF_IS_MPZ(b))
{
return mpz_sizeinbase(COEFF_TO_PTR(a), 2);
}
else
{
mpz_ptr z1, z2;
slong s1, s2;
z1 = COEFF_TO_PTR(a);
z2 = COEFF_TO_PTR(b);
s1 = FLINT_ABS(z1->_mp_size);
s2 = FLINT_ABS(z2->_mp_size);
if (s1 == s2)
{
v = z1->_mp_d[s1 - 1] | z2->_mp_d[s1 - 1];
}
else if (s1 > s2)
{
v = z1->_mp_d[s1 - 1];
}
else
{
v = z2->_mp_d[s2 - 1];
s1 = s2;
}
return (s1 - 1) * FLINT_BITS + FLINT_BIT_COUNT(v);
}
}
}