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/*
Copyright (C) 2014 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 "mag.h"
void
mag_add_2exp_fmpz(mag_t z, const mag_t x, const fmpz_t e)
{
if (mag_is_special(x))
{
if (mag_is_zero(x))
{
MAG_MAN(z) = MAG_ONE_HALF;
_fmpz_add_fast(MAG_EXPREF(z), e, 1);
}
else
{
mag_inf(z);
}
}
else
{
slong shift;
shift = _fmpz_sub_small(MAG_EXPREF(x), e);
if (shift > 0)
{
_fmpz_set_fast(MAG_EXPREF(z), MAG_EXPREF(x));
if (shift >= MAG_BITS)
MAG_MAN(z) = MAG_MAN(x) + LIMB_ONE;
else
MAG_MAN(z) = MAG_MAN(x) + (LIMB_ONE << (MAG_BITS - shift));
}
else
{
shift = -shift;
_fmpz_add_fast(MAG_EXPREF(z), e, 1);
if (shift >= MAG_BITS)
MAG_MAN(z) = MAG_ONE_HALF + LIMB_ONE;
else
MAG_MAN(z) = MAG_ONE_HALF + (MAG_MAN(x) >> (shift + 1)) + LIMB_ONE;
}
MAG_ADJUST_ONE_TOO_LARGE(z);
}
}